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  • Articles  (57)
  • interface  (33)
  • Nitrogen fixation
  • kinetics
  • Springer  (57)
  • 1995-1999  (57)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (57)
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  • Articles  (57)
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  • 1
    Electronic Resource
    Electronic Resource
    Degradation of Cellulosic Materials Under the Alkaline Conditions of a Cementitious Repository for Low- and Intermediate-Level Radioactive Waste. II. Degradation Kinetics (1999)
    Springer
    Journal of polymers and the environment 7 (1999), S. 41-51 
    Details
    ISSN: 1572-8900
    Keywords: Cellulose ; alkaline degradation ; peeling off ; degree of polymerization ; kinetics ; (gluco)isosaccharinic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The degradation of cellulosic materials, differing mainly in the degree of polymerization and the number of reducing end groups, was studied under the alkaline conditions similar to those existing in a cementitious repository for low- and intermediate-level radioactive waste (pH 13.3, T = 25°C). The kinetics of alkaline degradation (peeling-off reaction) were studied and the data analyzed by the model of Haas et al. [13]. The observed kinetic parameters for the propagation reaction and overall stopping reaction were compared with literature data. Although measured under different experimental conditions, literature data and data from this study show a consistent picture. Differences in the extent of degradation observed for the different cellulosic materials could be satisfactorily explained by differences in reducing end group content and, consequently, by differences in the degrees of polymerization. Besides the number of reducing end groups, the degree of amorphousness also plays an important role. The main degradation products formed under the experimental conditions used are α- and β-(gluco)isosaccharinic acid. This is in agreement with many other studies on alkaline degradation of cellulose. The two isomers are formed in roughly equal amounts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021894102937
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  • 2
    Electronic Resource
    Electronic Resource
    Analytical solutions for anisotropic bimaterials under several boundary conditions on the interface (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 66-75 
    Details
    ISSN: 1432-0681
    Keywords: Analytical solutions ; in-plane loading ; bimaterial ; boundary conditions ; interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Analytical solutions are proposed for the stress and displacement fields induced by in-plane loading of a bimaterial under several boundary conditions. The two joined orthotropic layers forming the bimaterial are allowed to possess different types of anisotropy with their planes of elastic symmetry arbitrarily inclined with respect to the horizontal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00787900
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  • 3
    Electronic Resource
    Electronic Resource
    Isothermal mass transfer in annular liquid jets with Sievert's solubility law (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 260-269 
    Details
    ISSN: 1432-0681
    Keywords: Liquid jet ; waste ; solubility ; interface ; fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A study of isothermal gas absorption by underpressurized, axisymmetric, thin, inviscid, incompressible, annular liquid jets which form enclosed volumes, where hazardous wastes may be burned, is presented. The study considers the nonlinear dynamical coupling between the fluid dynamics of, and the gases enclosed by, the annular liquid jet. It assumes equilibrium conditions at the interfaces, and employs Sievert's solubility law to determine the gas concentration at the gas-liquid interfaces. Both steady-state and transient conditions are considered. Under steady-state conditions, the fluid dynamics and mass transfer phenomena are uncoupled, and the rate of generation of combustion gases is equal to the mass absorption rate by the liquid. The transient behaviour of the annular jet is determined from initial conditions corresponding to steady-state operation, once there is no gas generation by the combustion of hazardous wastes. It is shown that, for most of the conditions considered in this paper, there is no leakage of gaseous combustion products through the jet's outer interface, and that the amount of gases dissolved in the liquid at the nozzle exit and the solubility ratio play a paramount role in determining the mass fluxes of hazardous combustion products at the annular jet's interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805465
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  • 4
    Electronic Resource
    Electronic Resource
    Isothermal mass transfer in annular liquid jets with Sievert’ solubility law (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 260-269 
    Details
    ISSN: 1432-0681
    Keywords: Key words Liquid jet ; waste ; solubility ; interface ; fluid dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A study of isothermal gas absorption by underpressurized, axisymmetric, thin, inviscid, incompressible, annular liquid jets which form enclosed volumes, where hazardous wastes may be burned, is presented. The study considers the nonlinear dynamical coupling between the fluid dynamics of, and the gases enclosed by, the annular liquid jet. It assumes equilibrium conditions at the interfaces, and employs Sievert’ solubility law to determine the gas concentration at the gas-liquid interfaces. Both steady-state and transient conditions are considered. Under steady-state conditions, the fluid dynamics and mass transfer phenomena are uncoupled, and the rate of generation of combustion gases is equal to the mass absorption rate by the liquid. The transient behaviour of the annular jet is determined from initial conditions corresponding to steady-state operation, once there is no gas generation by the combustion of hazardous wastes. It is shown that, for most of the conditions considered in this paper, there is no leakage of gaseous combustion products through the jet’ outer interface, and that the amount of gases dissolved in the liquid at the nozzle exit and the solubility ratio play a paramount role in determining the mass fluxes of hazardous combustion products at the annular jet’ interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805465
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlocal stress field of interface dislocations (1998)
    Springer
    Archive of applied mechanics 68 (1998), S. 179-184 
    Details
    ISSN: 1432-0681
    Keywords: Key words dislocations ; interface ; nonlocal elasticity ; balance laws
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The basic theory of nonlocal elasticity is stated with emphasis on the difference between the nonlocal theory and classical continuum mechanics. The concept of Nonlocal Interface Residual (NIR) is introduced in nonlocal theory. With the concept of NIR and the nonlocal constitutive equation, we calculate nonlocal stresses due to an edge dislocation on the interface of bi-materials. The nonlocal stress distribution along an interface is quite different from the classical one. Instead of the singularity in the dislocation core, nonlocal stress gives a finite value in the core. A maximum of the stress is also found near the dislocation core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050155
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  • 6
    Electronic Resource
    Electronic Resource
    Analytical solutions for anisotropic bimaterials under several boundary conditions on the interface (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 66-75 
    Details
    ISSN: 1432-0681
    Keywords: Key words Analytical solutions ; in-plane loading ; bimaterial ; boundary ; conditions ; interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  Analytical solutions are proposed for the stress and displacement fields induced by in-plane loading of a bimaterial under several boundary conditions. The two joined orthotropic layers forming the bimaterial are allowed to possess different types of anisotropy with their planes of elastic symmetry arbitrarily inclined with respect to the horizontal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00787900
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  • 7
    Electronic Resource
    Electronic Resource
    Thermoelectroelastic Green's function and its application for bimaterial of piezoelectric materials (1998)
    Springer
    Archive of applied mechanics 68 (1998), S. 433-444 
    Details
    ISSN: 1432-0681
    Keywords: Key words piezoelectric plate ; Green function ; bimaterial ; crack ; interface ; thermal stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary For a two-dimensional piezoelectric plate, the thermoelectroelastic Green's functions for bimaterials subjected to a temperature discontinuity are presented by way of Stroh formalism. The study shows that the thermoelectroelastic Green's functions for bimaterials are composed of a particular solution and a corrective solution. All the solutions have their singularities, located at the point applied by the dislocation, as well as some image singularities, located at both the lower and the upper half-plane. Using the proposed thermoelectroelastic Green's functions, the problem of a crack of arbitrary orientation near a bimaterial interface between dissimilar thermopiezoelectric material is analysed, and a system of singular integral equations for the unknown temperature discontinuity, defined on the crack faces, is obtained. The stress and electric displacement (SED) intensity factors and strain energy density factor can be, then, evaluated by a numerical solution at the singular integral equations. As a consequence, the direction of crack growth can be estimated by way of strain energy density theory. Numerical results for the fracture angle are obtained to illustrate the application of the proposed formulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050177
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  • 8
    Electronic Resource
    Electronic Resource
    On the plane piezoelectric problem of a loaded crack terminating at a material interface (1996)
    Springer
    Acta mechanica solida Sinica 9 (1996), S. 151-158 
    Details
    ISSN: 0894-9166
    Keywords: piezoelectricity ; crack ; axial conjugate ; interface ; singular integral equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The plane problem of a crack terminating at the interface of a bimaterial piezoelectric, and loaded on its faces, is treated. The emphasis is placed on how to transform this problem into a non-homogeneous Hilbert problem. To make the derivation tractable, the concept of the axial conjugate is introduced and related to the complex conjugate. The angle between the crack line and the interface may be arbitrary. Numerical results are given to illustrate the stress singularity at crack tip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02209159
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  • 9
    Electronic Resource
    Electronic Resource
    Tetrachlorosilane Consumption in Radio Frequency Glow Discharge (1998)
    Springer
    Plasma chemistry and plasma processing 18 (1998), S. 509-533 
    Details
    ISSN: 1572-8986
    Keywords: RF SiCl4 discharge ; mass spectrometry ; kinetics ; decomposition ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Time-resolved mass spectrometry was used for analysis of the plasma reactions in radio frequency (RF) SiCl 4 and SiCl 4 −O 2 discharges as functions of starting partial pressure and electrical power. Molecular concentrations of the reactants and products from SiCl 4 alone and with O 2 were obtained from the mass spectra and used for plotting the kinetic curves. The SiCl 4 and O 2 consumption rates were calculated from the kinetic curves and compared with results of theoretical simulation of the reaction. Direct electron impact decomposition was found to be the main pathway for pure SiCl 4 conversion. On the contrary, the consumption of SiCl 4 in the SiCl 4 +O 2 mixtures was largely chemical. The experimental macrokinetics are in agreement with a model in which oxidation is caused by the atomic oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021811316740
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation of the Chemical Action of the Gliding and “Point” Arcs Between the Metallic Electrode and Aqueous Solution (1999)
    Springer
    Plasma chemistry and plasma processing 19 (1999), S. 53-67 
    Details
    ISSN: 1572-8986
    Keywords: Arc ; gliding arc ; gas temperature ; electron temperature ; ion composition ; ion bombardment ; liquid electrode ; dye oxidation ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The plasma–solution interaction processes for gliding and “point” arcs between the aqueous solution surface and the metal electrode in the gas phase are studied. The plasma, liquid, and surface zones are taken into consideration. The electric field strength is measured, and the gas and electron temperatures and ion composition are estimated for the plasma zone. The cathode fall, water vaporization rate, and active species current yield due to the radiation chemistry mechanism are determined for the surface zone. The efficiency of oxidation of iodine ions and organic dyes by different types of discharge in the liquid zone are investigated. The difference in action of the various discharge types may be connected with various influences of the plasma and surface zone on the oxidation processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021803932496
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  • 11
    Electronic Resource
    Electronic Resource
    Kinetics of Solid State Reactions With Fractal Reagent (1998)
    Springer
    Journal of materials synthesis and processing 6 (1998), S. 305-309 
    Details
    ISSN: 1573-4870
    Keywords: Fractals ; solid state reaction ; kinetics ; nucleation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In the present research we theoretically studied the kinetics of nucleation-limited solid state reactions as influenced by the fractal properties of solid reagent. We consider the model of equal-sized primary particles assembled in fractal cluster. The geometry of such an object is assumed to be described solely by its fractal dimension D and by upper (R max) and lower (R min) cutoffs of fractality further identified with the overall size of the object and the size of the primary particle correspondingly. Depending on the ratio between R max, R min and the radius of the critical nucleus R nucl the following cases are considered: (1) R max ∼ R nucl. In this case the reaction kinetics is described by the equation: α = 1 − B{ln(k′ τ + 1)}D/(D−3), where B, k′ are constants. Numerical solution of this equation gives rise to n-order reaction kinetics with n & 1. (2) R min ≪ R nucl ≪ R max. In this case under certain conditions there can exist non-trivial critical density ρcrit ≠ 0, 1 that favors the formation of the critical nuclei of the new phase. The asymptotic kinetic equation for large times corresponds to n-order reaction with n = (D + 3)/(D + 1). (3) R min ≪ R nucl ∼ R max′. In this case the reaction follows the first-order kinetics with D-dependent rate constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022643008915
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  • 12
    Electronic Resource
    Electronic Resource
    Interfacial Effects on the Dynamic Mechanical Behavior of Weft-Knitted Glass Fiber Fabric-Reinforced Polypropylene Composites Produced of Commingled Yarns. Tensile and Flexural Response (1997)
    Springer
    Applied composite materials 4 (1997), S. 209-218 
    Details
    ISSN: 1573-4897
    Keywords: commingled yarn ; dynamic-mechanical thermal analysis (DMTA) ; interface ; knitted fabric-reinforced ; polypropylene (PP) ; stiffness anisotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Weft knitted glass fiber (GF) fabric-reinforced polypropylene (PP) composite sheets were produced by hot pressing of knit layers composed of a commingled yarn with a GF content of 70 wt.%(≉45 vol.%). The effects of fiber/matrix adhesion and reinforcing knit-induced stiffness anisotropy were characterized by dynamic-mechanical thermoanalysis (DMTA). DMTA spectra were registered under tensile and flexural loading in both course (C) and wale (W) direction of the knit. The knit structure-related stiffness anisotropy (relation of the Young‘s moduli measured in W- and C-directions, respectively), which proved to depend also on the loading mode of the composites, were well reflected in the DMTA spectra. The detrimental effect of poor adhesion between GF and PP could be clearly resolved when specimens cut in the C-direction were investigated. This seems to be in analogy with the transverse mechanical response of undirectional (UD) fiber-reinforced composites with interfacial variations. It was suggested that the heating-induced lofting of the composites is relied on the bond quality between GF and PP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008892619464
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  • 13
    Electronic Resource
    Electronic Resource
    Oxidation behavior of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si superalloy at high temperature in Ar-H2O atmospheres (1997)
    Springer
    Oxidation of metals 47 (1997), S. 411-426 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; Incoloy 909 ; superalloy ; scale ; high temperature ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si superalloy (Incoloy 909 type alloy), was investigated at temperatures between 1000 K and 1400 K in Ar-(1, 10%)H20 atmosphere using metallographic, electron probe microanalysis, and X-ray diffraction techniques. The oxide scales consist of an external scale and an internal scale which has an intergranular scale (above 1200 K) and an intergranular scale. The oxide phases in each scale are identified asα-Fe2,O3 (below 1200 K) or FeO (above 1300 K) and CoO · Fe2O3 and FeO · Nb2O5, respectively. The morphologies, the oxide phases and the oxidation rates do not depend on the partial pressure of H2O in the range between one and ten percent in Ar gas. The rate constants for the intergranular-scale formation in this alloy are about one-tenth as large as those in Fe-36%Ni alloy reported previously. At all the temperatures the scales grow according to a parabolic rate law and the apparent activation energies for the processes are estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02134784
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  • 14
    Electronic Resource
    Electronic Resource
    On the oxidation ofα-Fe andε-Fe2N1−z : I. Oxidation kinetics and microstructural evolution of the oxide and nitride layers (1997)
    Springer
    Oxidation of metals 48 (1997), S. 87-109 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; kinetics ; iron ; iron-nitride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of α-Fe and ɛ-Fe2N1−z at 573 K and 673 K in O2 at 1 atm was investigated by thermogravimetrical analysis, X-ray diffraction, light-optical microscopy, scanning electron microscopy and electron probe X-ray microanalysis. Upon oxidation at 573 K and 673 K, on α-Fe initially α-Fe2O3 develops, whereas on ɛ-Fe2N1−z initially Fe3O4 develops. In an early stage of oxidation the oxidation rate of ɛ-Fe2N1−z appears to be much larger than of α-Fe. This can be attributed largely to an effective surface area available for oxygen uptake, which is much larger for ɛ-Fe2N1−z than for α-Fe due to the porous structure of ɛ-Fe2N1−z as prepared by gaseous nitriding of iron. The development of a magnetite layer in-between the hematite layer and the α-Fe substrate, at a later stage of oxidation, enhances layer-growth kinetics. After 100 min oxidation at 673 K the (parabolic) oxidation rates for α-Fe and ɛ-Fe2N1−z become about equal, indicating that on both substrates the oxide growth is controlled by the same rate limiting step which is attributed to short-circuit diffusion of iron cations. Oxidizing ɛ-Fe2N1−z increases the nitrogen concentration in the remaining ɛ-iron nitride, because the outward flux of iron cations, necessary for oxide growth, leads to an accumulation of nitrogen atoms left behind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01675263
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  • 15
    Electronic Resource
    Electronic Resource
    Scale formation on γ-TiAl during oxidation at 800 and 900°C in air and in He + 20% O2 (1997)
    Springer
    Oxidation of metals 48 (1997), S. 171-184 
    Details
    ISSN: 1573-4889
    Keywords: TiAl, corrosion ; high-temperature ; kinetics ; nitrogen dependence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxide scale formation on γ-TiAl at 800 and 900°C was studied using high temperature X-ray diffraction as anin situ-method. The experiments were performed in air and in He with 20 vol.% O2. The formation of alumina in the form of α-Al2O3 and of TiO2 in the form of rutile was observed in both atmospheres and the formation of TiN was detected in air. Depending on the atmosphere the diffraction peaks of two different additional phases were detected, which do not exist in any data base nor in the Ti-Al-O phase diagram. One of them, the Z-phase, appears in He with 20 vol.% O2 and the other, the X-phase, in air. The Zphase was also found at room temperature after oxidation at 900°C in air. The growth of both phases, X and Z, starts immediately with the oxidation process and follows the parabolic rate law.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01675267
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  • 16
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of pure titanium in CO2 and Ar-10%CO2 atmospheres (1997)
    Springer
    Oxidation of metals 48 (1997), S. 289-302 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; titanium ; rutile ; scale ; high temperature ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of pure titanium has been investigated in the temperature range of 1000 K to 1300 K in CO2 or Ar-10%CO2. Optical microscopy, electron probe microanalyses, and X-ray measurements on the oxide scales formed during oxidation indicate that their structures are nearly independent of temperature and the corrosion atmosphere. The scales consisted of two layers, an external one and an internal one, having a rutile (TiO2) structure. The parabolic rate law was confirmed for growth of the external scale and the permeation depth of oxygen in titanium with apparent activation energies of 266 and 226 kJ/mol, respectively. The rate-determining diffusion species in the oxidation processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01670504
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  • 17
    Electronic Resource
    Electronic Resource
    The Kinetics of Pore Shape Evolution in Alumina (1998)
    Springer
    Journal of materials synthesis and processing 6 (1998), S. 161-167 
    Details
    ISSN: 1573-4870
    Keywords: Alumina ; surface ; kinetics ; diffusion ; SALK
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of shape evolution of a completely faceted crystal/internal void by surface diffusion was modeled. Arrays of micron-sized cavities were generated in sapphire substrates with known surface orientations using microlithography and ion beam etching and converted to internal intragranular pores of nonequilibrium shape by diffusion bonding of the etched substrate to an identical-orientation unetched sapphire substrate. Pore shape evolution rates during high-temperature anneals were monitored and found to be highly sensitive to the orientation of the substrate surface. The observed evolution rates were compared with the predictions of the kinetic model using diffusivity values for alumina that span the range from the highest to the lowest diffusion constants reported in the literature. The comparison suggests that surface-attachment-limited kinetics (SALK) play a major role in surface mass transport on stable low-index planes of alumina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022665418505
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  • 18
    Electronic Resource
    Electronic Resource
    High-temperature oxidation of tantalum of different purity (1995)
    Springer
    Oxidation of metals 43 (1995), S. 509-526 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; kinetics ; tantalum ; oxide ; suboxide ; impurities ; diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics, structural aspects, and phase morphologies were studied for tantalum oxidation in air from 600 to 1000°C for samples of different purity (99.15%, 99.76%, and 99.95% Ta). Regardless of purity, tantalum oxidation in the temperature range of 600–800°C as a rule is governed by a linear rate law. From 900 to 1000°C the initial-stage oxidation is governed by the parabolic rate law, which changes to the linear rate law with time. TGA, XRD, SEM, and AES methods were used. The, effect of purity on tantalum oxidation was shown to be determined by the mechanism of intermediate-oxide formation. They are TaO z (Ta2O) at 600–800°C and TaO at 900–1000°C. The final product of oxidation was β-Ta2O5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046896
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  • 19
    Electronic Resource
    Electronic Resource
    Sulfidation behavior of a ferritic commercial alloy in different sulfidizing environments at high temperature (1995)
    Springer
    Oxidation of metals 43 (1995), S. 543-560 
    Details
    ISSN: 1573-4889
    Keywords: stainless steel ; sulfidation ; hydrogen sulfide ; sulfur vapor ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The sulfidizing behavior of Fe−22Cr−4Al−0.15Zr (wt.%) was studied in two atmospheres: S2 vapor over the range 4.4–25.4 Pa and H2−H2S mixtures corresponding to aP S 2 range 0.2–1.297 Pa in the temperature range 973–1373 K. It was found that the constitution of the gaseous phase is of great importance on the corrosion kinetics and the morphology of the corrosion products. Furthermore, a stratification phenomenon during scale growth was observed during the initial sulfidation stage in H2−H2S mixtures containing a sufficiently high H2S partial pressure. This behavior was not observed during tests in puresulfur vapor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046898
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  • 20
    Electronic Resource
    Electronic Resource
    Role of interface structure and interfacial defects in oxide scale growth (1995)
    Springer
    Oxidation of metals 44 (1995), S. 63-79 
    Details
    ISSN: 1573-4889
    Keywords: scale growth ; oxidation mechanism ; kinetics ; scale adherence ; reactive element effect ; intertacial segregation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Recent studies of the structure and dynamics of solid-solid interfaces have provided some understanding about the role of the scale-metal interface in the growth of reaction product scales on pure metals. The action of interfacial defects (misfit dislocations, misorientation dislocations and disconnections) in the creation and annihilation of the point defects suporting the diffusional growth of scales is considered. Anion point defects (vacancies/interstitials) supporting scale growth by anion diffusion are annihilated/created by the climb of misorientation dislocations or disconnections in the scale at the interface. For scale growth by cation diffusion, cation point defects (vacancies/interstitials) can be annihilated/created by the climb of interfacial misfit or misorientation dislocations in the metal. Because of their necessarily high density, in most cases, the dominant climb of misfit dislocations would be favored. The blocking of interfacial reaction steps can be a means to retard the scaling kinetics and to alter the fundamental scaling mode. For instance, the interfacial segregation of large reactive element ions can pin the interface dislocations, an action which poisons the usual interfacial reaction step. Such considerations are consistent with the well-known phenomena ascribed to the reactive element effect (REE).
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    URL: http://dx.doi.org/10.1007/BF01046723
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    An approximate treatment of the transient state in the corrosion of binary alloys forming the most-stable oxide. Part I: Solid-solution alloys (1997)
    Springer
    Oxidation of metals 47 (1997), S. 91-115 
    Details
    ISSN: 1573-4889
    Keywords: binary alloys ; oxidation ; transient state ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The initial transient stage in the oxidation of binary alloys forming scales exclusively composed of the most stable oxide is examined by means of a simplified approach which avoids the numerical integration of the diffusion equation for the transport of the metal components in the alloy. At variance with previous solutions to this problem obtained by means of numerical methods, this treatment takes into account also the effect of the gas-scale reaction at the outer surface of the oxide. The concentration of the most-reactive component at the alloy surface changes gradually with time from the initial bulk value towards the corresponding steady-state value without involving any minimum, while the overall rate of the reaction presents a gradual transition from an initial nearly linear towards final parabolic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682373
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    A crack perpendicular to and terminating at a bimaterial interface (1998)
    Springer
    Acta mechanica Sinica 14 (1998), S. 27-36 
    Details
    ISSN: 1614-3116
    Keywords: interface ; perpendicular crack ; gerneralized stress intensity factor ; T stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using dislocation simulation approach, the basic equation for a finite crack perpendicular to and terminating at a bimaterial interface is formulated. A novel expansion method is proposed for solving the problem. The complete solution to the problem, including the explicit formulae for theT stresses ahead of the crack tip and the stress intensity factors are presented. The stress field characteristics are analysed in detail. It is found that normal stresses {ie27-1} and {ie27-2} ahead of the crack tip, are characterised byQ fields if the crack is within a stiff material and the parameters |p T | and |q T | are very small, whereQ is a generalised stress intensity factor for a crack normal to and terminating at the interface. If the crack is within a weak material, the normal stresses {ie27-3} and {ie27-4} are dominated by theQ field plusT stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486828
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    Global view of microstructural evolution: Energetics, kinetics and dynamical systems (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 144-157 
    Details
    ISSN: 1614-3116
    Keywords: microstructural evolution ; energetics ; kinetics ; dynamic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An evolving material structure is in a non-equilibrium state, with free energy expressed by the generalized coordinates. A global approach leads to robust computations for the generalized thermodynamic forces. Those forces drive various kinetic processes, causing dissipation at spots, along curves, surfaces and interfaces, and within volumetric regions. The actual evolution path, and therefore the final equilibrium state, is determined by the energetics and kinetics. A virtual work principle links the free energy landscape and the kinetic processes, and assigns a viscous environment to every point on the landscape. The approach leads to a dynamical system that governs the evolution of generalized coordinates. The microstructural evolution is globally characterized by a basin map in the coordinate space; and by a diversity map and a variety map in the parameter space. The control of basin boundaries raises the issue of energetic and kinetic bifurcations. The variation of basin boundaries under different sets of controlling parameters provides an analytical way to plot the diversity maps of structural evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486793
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    Interdiffusion and adhesion at the inteface of a polystyrene-poly(2,6-dimethyl-1,4-phenylene oxide) blend below the glass transition temperature (1999)
    Springer
    Mechanics of composite materials 35 (1999), S. 441-446 
    Details
    ISSN: 1573-8922
    Keywords: polystyrene ; poly(2,6-dimethyl 1,4-phenylene oxide) ; interface ; interdiffusion ; strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experiments on adhesion between the film surfaces of a polystyrene (PS)-poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) blend were carried out below the glass transition temperature of the bulk (T g ), at T=T g −13 and T=T g −23°C. The contact time varied from 2 to 1440 min. The strength at the interface was then measured at room temperature. The strength at the blend-blend interface was calculated using an additive diffusion model which takes into account the strength at homopolymer-homopolymer interfaces (PS-PS, PS-PPO, and PPO-PPO), surface concentration of components, and its variation with depth. A fair agreement between the calculated and measured strength was found. The results of the study support the concept of decreasing glass transition temperature near the surface of polymer glasses as compared with T g of the bulk.
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    URL: http://dx.doi.org/10.1007/BF02329331
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    Boundary-value problem in the correlative approximation of the method of quasi-periodic components for a unidirectional fiber composite (1999)
    Springer
    Mechanics of composite materials 35 (1999), S. 419-428 
    Details
    ISSN: 1573-8922
    Keywords: structure ; approximation ; algorithm ; cell ; one-inclusion ; interface ; stress ; rigid fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The boundary-value problem in the correlative approximation of the method of quasi-periodic components and a numerical algorithm based on the boundary element method for determining the nonuniform stress fields in the matrix of a unidirectional fiber composite with a disordered structure are considered. The numerical results and analysis of the probability density function, for example, for normal stresses at some points of the interface of absolutely rigid fibers of the composite are presented.
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    URL: http://dx.doi.org/10.1007/BF02329328
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    A New Trend of Ceramics Research in Japan: “Frontier Ceramics” National Project (1999)
    Springer
    Journal of electroceramics 4 (1999), S. 7-13 
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    ISSN: 1573-8663
    Keywords: frontier ceramics ; interface ; grain boundary ; bicrystals ; microstructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes a new concept thrust in advanced ceramics entitled “Frontier Ceramics.” A national project concerning Frontier Ceramics was organized by the Ministry of the Science Technology Agency of Japan. The key objective of the program is to provide an improved understanding of boundaries or interfaces. The approach to be taken is to develop improved means for tailoring ceramic interface through control of structure and composition by use of novel processing techniques and thereby to achieve desired properties. Three main topics in the project relate to the construction of (1) “singular point model”, (2) “ordering interface model,” and (3) “continuous interface model.” Some recent results using bicrystals were reviewed.
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    URL: http://dx.doi.org/10.1023/A:1009914431538
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    Structure Simulation on Twisted Boundaries in SrTiO3 Bicrystals by Molecular Dynamics Calculation (1999)
    Springer
    Journal of electroceramics 4 (1999), S. 91-98 
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    ISSN: 1573-8663
    Keywords: SrTiO3 ; interface ; grain boundary ; bicrystals ; structure simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Bicrystals of SrTiO3 with twisted boundaries were prepared by a HIP method and were observed with a transmission electron microscope (TEM). The bicrystals exhibited different nonlinear current-voltage characteristics depending on twist angle. A Molecular dynamics calculation was applied in order to understand the detailed interface structure. The periodicity of the Σ5 twisted boundary was calculated to be 1.58 times longer than the lattice constant of SrTiO3 along the (130) axis, and agreed with the periodicity observed by TEM, i.e., 1.57. Coincidence sites formed between Ti ions of the TiO2 layer and O ions of the SrO layer at the interface and did not shift the positions predicted by a coincidence sites lattice model; such coincidence sites caused the structural periodicity along the interface.
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    URL: http://dx.doi.org/10.1023/A:1009902608765
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    Kinetics of vesicle formation (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 303-306 
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    ISSN: 1435-1536
    Keywords: Key words Vesicle ; self-assembly ; hydrotrope ; stopped-flow ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The kinetics of vesicle formation from a hydrotrope (sodium xylenesulfonate) solution of a surfactant (Laureth 4) is studied by the use of a stopped-flow apparatus combined with a dynamic light scattering device to determine vesicle size in the system. The hydrotrope system studied presents a system with a high surfactant solubilization combined with vesicle formation simply by dilution with water. The kinetic results show a single exponential decay time. The kinetic analysis indicates that the vesicles are formed from a molecular solution which resulted from the shear in the stopped-flow device and grow by monomeric association.
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    URL: http://dx.doi.org/10.1007/s003960050086
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    Kinetics of interaction of 3-aminopropyltriethoxysilane with silica gel using elemental analysis and 29Si NMR spectra (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 672-680 
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    ISSN: 1435-1536
    Keywords: Key words 3-aminopropyltriethoxy silane ; silica gel ; interaction ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Three silica gel sample systems, modified with 3-amino-propyltriethoxy silane (APTS), were prepared by sequentially sampling the reaction mixture at various time intervals. The concentrations of 3-aminopropylsilyl groups (APS) bound on the silica surface were determined by elemental analysis. For the same sample systems, 29Si NMR intensities of an (–O)4Si species belonging only to the silica gel particles and corrected by a cross-polarization correction factor were also measured. Both the APS-concentrations and the correc-ted 29Si NMR intensities depended upon reaction time, reflecting the rate of the APTS–silica gel reaction. Kinetic analysis of these data was made by use of the Gauss–Newton method, and the overall reaction was found to consist of three reaction processes (an initial fast reaction, a slower second reaction and a much slower third reaction). In particular, the conversion of (–O)3SiOH to (–O)4Si is predominant in the second reaction process and the pore size of a silica gel particle affects the reaction mechanism.
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    URL: http://dx.doi.org/10.1007/s003960050134
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    Dielectric method for detection of phase separation and its kinetics in TMPC/PS blends (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 524-532 
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    ISSN: 1435-1536
    Keywords: Blends ; tetramethyl polycarbonate ; polystyrene ; LCST ; phase separation ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new method for the detection of phase separation and its kinetics through real-time measurements is presented using the dielectric technique. The kinetics of phase separation were determined for a blend of tetramethyl bisphenol-A polycarbonate TMPC and polystyrene PS at different temperatures. The temperature dependence of the rate constant of phase separation was determined. The activation energy of phase separation process is found to be equal to 46 kcal/mole. In addition, it was possible to determine the variation in the composition of the TMPC-rich phase with time. The results obtained were compared with the literature data and were found to be in good agreement.
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    URL: http://dx.doi.org/10.1007/BF00658681
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    Dynamic measurements of adsorption of hydrolyzed polyacrylamide (HPAM) onto hematite (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 1028-1032 
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    ISSN: 1435-1536
    Keywords: Hydrolyzed polyacrylamide ; hematite ; adsorption ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The adsorption measurements of hydrolyzed polyacrylamide (HPAM) onto hematite suspension are carried out to study the dynamics of the polymer adsorption onto the suspension particles and to investigate the mode of the polymer adsorption. The polymer is found to show much affinity for the adsorption because of the opposite charges possessed by the polymeric flocculant and the suspension particles. Various adsorption parameters such as adsorption coefficient, the rate constants for the adsorption and desorption, are evaluated with the help of a recently proposed kinetic scheme. It is found that the extent of adsorption and the adsorption rate are adequately affected by increasing the pH of the suspension while, unexpectedly, the adsorption is found to show only a marginal increase on addition of Na2SO4. Both the amount of the adsorbed polymer and the adsorption rate are also found to increase with the degree of hydrolysis of the polyelectrolyte.
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    URL: http://dx.doi.org/10.1007/BF00657669
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    Static and dynamic light scattering from the nematic wetting layer in an Isotropic liquid crystal (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 187-190 
    Details
    ISSN: 1435-1536
    Keywords: Light scattering ; evanescent wave ; liquid crystals ; wetting ; interface ; fluctuations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract By the use of the evanescent wave technique the fluctuations of the nematic wetting layer in an isotropic liquid crystal have been investigated by static and dynamic light scattering. As the homeotropically oriented layer is birefringent, its critical angles of total internal reflection for the ordinary and extraordinary rays differ from that of the bulk. For a suitable selected angle of incidence there is a propagating extraordinary ray in the layer which becomes evanescent in the bulk. In this case the scattering of the layer is enhanced and therefore well accessible to the measurement. It shows up to be strongly dependent on the scattering vector component parallel to the interface, in contrast to the bulk scattering with no marked dependence on the scattering vector. At angles of incidence with evanescent waves in bulk and layer, a broad long time decay shows up, which seems to be typical for evanescent measurements and can be described with an algebraic functional dependence.
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    URL: http://dx.doi.org/10.1007/BF01182446
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    Adsorption kinetics of alkyl phosphine oxides in water/alkane systems with transfer across the interface (1997)
    Springer
    Colloid & polymer science 105 (1997), S. 346-350 
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    ISSN: 1435-1536
    Keywords: Adsorption kinetics ; surfactants ; transfer across ; interface ; interfacial tension ; water/hexane ; n-alkyl dimethyl phosphine oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The adsorption kinetics of alkyl phosphine oxides soluble both in water and in alkanes has been experimentally studied by measuring the dynamic interfacial tension. To this aim the pendant drop method was used with an automatic acquisition of the drop shape (ASTRA). The experimental results show that under particular geometrical and initial conditions, the dynamic interfacial tension exhibits a minimum. This nonmonotonic behaviour can be explained by considering the transfer of matter through the surface during the adsorption and the depletion of one phase necessary to establish the partition equilibrium. These data can be interpreted on the basis of a diffusion controlled adsorption model involving two finite phases. Moreover a particular experimental procedure for measuring the partition coefficient has been used based on the equilibrium surface tension measurements and on the evaluation of the adsorption isotherm.
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    URL: http://dx.doi.org/10.1007/BF01188976
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    Sponge-like structures and their Gaussian curvatures in polymer mixtures and microemulsions (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 118-126 
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    ISSN: 1435-1536
    Keywords: Polymer mixtures ; microemulsions ; spinodal decomposition ; sponge-like structure ; interface ; Gaussian curvature ; mean curvature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Bicontinuous structures formed in the late stage of spinodal decomposition (SD) in polymer mixtures were explored experimentally by time-resolved light scattering (TLS) and laser scanning confocal microscopy (LSCM) and computationally by three-dimensional (3D) simulations based on time-dependent Ginzburg-Landau (TDGL) theory. The 3D structures constructed by LSCM exhibited a sponge-like structure and were found to be statistically identical to those constructed by the computer simulations through equality of their scattering structure factors. Moreover, their structure factors were found to be identical to that obtained by TLS, revealing that the 3D structures truly reflect the structure entities occurring in the polymer mixtures and that the TDGL theory accounts for the phase structures evolving in the late stage SD. Gaussian curvatureK and mean curvatureH were evaluated from the 3D structures, the results of which were compared with the “scattering-mean-curvature” determined by using the Kirste-Porod theory and withK determined by using a Gaussian random-field theory. The sponge-like structure was found to be strikingly similar to that occurring in an equilibrium microemulsion system at the hydrophile-lipophile balance temperature, though their characteristic length scales are different by two-three orders of magnitude.
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    Crack-tip Caustics at a bi-Material Interface (1999)
    Springer
    International journal of fracture 98 (1999), S. 329-342 
    Details
    ISSN: 1573-2673
    Keywords: Crack ; interface ; caustic ; Airy-function ; stress field.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The size and the shape of crack-tip caustics, at a bi-material interface, under static load, are studied. When the crack-tip, which is perpendicular to interface, is at the interface of the bi-material, the caustic depends on the properties of the two materials. Thus, the caustic is divided into two branches. The size of the two branches of the caustic mainly depends on the elastic modulus and Poisson's ratios of the two materials.
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    URL: http://dx.doi.org/10.1023/A:1018617719180
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    Solute segregation at grain boundaries (1996)
    Springer
    Interface science 3 (1996), S. 241-267 
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    ISSN: 1573-2746
    Keywords: grain boundary segregation ; grain boundary cohesion ; fracture ; kinetics ; equilibrium ; anisotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This feature article summarizes the present art and science of grain boundary segregation from the viewpoint of the authors activities in this field. In the part on equilibrium segregation, fundamental effects on grain boundary segregation are discussed such as the nature of the solute/matrix binary system, presence of additional elements, temperature, grain boundary orientation and type of interface. In addition, the predictive capabilities of grain boundary segregation diagrams are outlined. The present models of segregation kinetics are reviewed and discussed in connection with recent experiments. The last part of the paper is focussed on the most important consequences of grain boundary segregation, i.e., grain boundary cohesion and fracture.
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    Numerical analysis of dynamic debonding under 2D in-plane and 3D loading (1998)
    Springer
    International journal of fracture 93 (1998), S. 13-38 
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    ISSN: 1573-2673
    Keywords: Dynamic fracture ; spectral method ; interface ; boundary integral method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We present a numerical scheme specially developed for 2D and 3D dynamic debonding problems. The method, referred to as spectral scheme, allows for a precise modeling of stationary and/or spontaneously expanding interfacial cracks of arbitrary shapes and subjected to an arbitrary combination of time- and space-dependent loading conditions. It is based on a spectral representation of the elastodynamic relations existing between the displacement components along the interface plane and the corresponding dynamic stresses. A general stress-based cohesive failure model is introduced to model the spontaneous progressive failure of the interface. The numerical scheme also allows for the introduction of a wide range of contact relations to model the possible interactions between the fracture surfaces. Simple 2D problems are used to investigate the accuracy and stability of the proposed scheme. Then, the spectral method is used in various 2D and 3D interfacial fracture problems, with special emphasis on the issue of the limiting speed for a spontaneously propagating debonding crack in the presence of frictional contact.
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    Asymmetrical Cracks Parallel to an Interface between Dissimilar Materials (1999)
    Springer
    International journal of fracture 96 (1999), S. 75-100 
    Details
    ISSN: 1573-2673
    Keywords: Crack ; interface ; stress intensity factors ; energy release rate ; stresses.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper solves a plane strain problem for two bonded dissimilar planes containing a crack parallel to the interface in each layer. The bimaterial system is loaded by tractions distributed along the crack surfaces. Based on the Fourier transform, the problem is reduced to a system of Cauchy type singular integral equations which contain exact and explicit kernel functions. The solution of these equations is obtained easily by utilizing Gauss–Chebyshev integral formulae for various material combinations and geometrical parameters. Several numerical results of stress intensity factors, energy release rate and stress distribution along the interface are presented to exhibit the interaction among cracks and interface.
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    URL: http://dx.doi.org/10.1023/A:1018769902240
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    The mode III axisymmetric crack problem in a non-homogeneous interfacial region between homogeneous half-spaces (1997)
    Springer
    International journal of fracture 85 (1997), S. 35-45 
    Details
    ISSN: 1573-2673
    Keywords: axisymmetric ; crack ; interface ; non-homogeneous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this study, the mode III axisymmetric crack problem in a non-homogeneous interfacial region between two homogeneous half-spaces is considered. The shear modulus of the interfacial layer is assumed to be µ2(z)=µ0 emz. It is also assumed that this shear modulus varies continuously between that of the two half-spaces. By using the Hankel transform technique the problem is reduced to a singular integral equation. The problem is solved for various material combinations, crack geometries and for three different sets of crack surface tractions, and the corresponding stress intensity factors are tabulated.
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    URL: http://dx.doi.org/10.1023/A:1007397402482
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    On the Elastic Field of a Shpherical Inhomogeneity with an Imperfectly Bonded Interface (1997)
    Springer
    Journal of elasticity 46 (1997), S. 91-113 
    Details
    ISSN: 1573-2681
    Keywords: inhomogeneity ; spherical ; interface ; debonding ; averaged properties.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This study is devoted to the development of a unified and explicit elastic solution to the problem of a spherical inhomogeneity with an imperfectly bonded interface. Both tangential and normal displacement discontinuities at the interface are considered and a linear interfacial condition, which assumes that the tangential and the normal displacement jumps are proportional to the associated tractions, is adopted. The elastic disturbance due to the presence of an imperfectly bonded inhomogeneity is decomposed into two parts: the first is formulated in terms of an equivalent nonuniform eigenstrain distributed over a perfectly bonded spherical inclusion, while the second is formulated in terms of an imaginary Somigliana dislocation field which models the interfacial sliding and normal separation. The exact form of the equivalent nonuniform eigenstrain and the imaginary Somigliana dislocation are fully determined in this paper.
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    Role of polymeric matrices in improving wear resistance of irradiated FRP composites (1995)
    Springer
    Tribology letters 1 (1995), S. 301-307 
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    ISSN: 1573-2711
    Keywords: resin ; matrices ; wear resistance ; interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present paper reports the effect of different resin matrices on the abrasive wear behaviour of woven fabric composites based on them. Three different resin systems and a common glass fibre reinforcement were used in the present study. It was found that polymer composites based on the epoxy resin system show maximum wear resistance. This has been attributed to the fact that fibre-matrix interfacial bonding is very strong between the glass fibres and epoxide resin. The bonding resists composite failure and improves on irradiation.
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    URL: http://dx.doi.org/10.1007/BF00174256
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    In situ formation of tribologically effective oxide interfaces in SiC‐based ceramics during dry oscillating sliding (1998)
    Springer
    Tribology letters 5 (1998), S. 173-190 
    Details
    ISSN: 1573-2711
    Keywords: alumina ; ceramic composite ; dry sliding ; interface ; interfilm sliding ; intrafilm sliding ; silicon carbide ; titanium carbide ; titanium boride ; tribo oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tribological behaviour of single‐phase SiC as well as both SiC–TiC and SiC–TiC–TiB2 composite materials sliding against aluminium oxide has been investigated at room temperature with regard to the formation of wear‐reducing interfaces. The experiments were carried out in dry air for reasons of excluding the strong influence of water vapour. The introduction of the titanium phases into the SiC microstructure reduces the system wear by more than a factor of ten. The coefficient of friction is only slightly reduced but stabilised with time. The relatively abrasive oxide interface in the Al2O3/SiC pairing is altered to a soft and malleable oxide interface in the Al2O3/SiC–TiC–TiB2 pairing. The wear reduction is mainly caused by a change of the wear mechanism so that the formed soft oxide wear debris is transferred to the counterbody, thus shifting the sliding plane further into the layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019181322343
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    Grain Boundary Migration in Solid State Discontinuous Reactions (1998)
    Springer
    Interface science 6 (1998), S. 113-131 
    Details
    ISSN: 1573-2746
    Keywords: discontinuous reactions ; discontinuous precipitation ; discontinuous coarsening ; discontinuous dissolution ; grain boundary ; migration ; diffusion ; kinetics ; mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Discontinuous reactions are a special class of solid state moving boundary reactions characterized by a discontinuous change in orientation and composition across the migrating reaction front that provides a short circuit path of solute transport. Grain boundary migration in discontinuous reactions is both of technological as well as fundamental interest. In this paper, the initiation/growth mechanism, product morphology, driving force, reaction kinetics, and effect of external parameters on the major discontinuous reactions, namely, discontinuous precipitation, coarsening, dissolution, and diffusion induced grain boundary migration have been discussed. In addition, a number of interesting features about boundary migration in discontinuous reactions has been analyzed. Finally, the scope and necessity of continued research attention in this area have been highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008672705642
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    The Compensation Effect in Thermally Activated Interface Processes (1998)
    Springer
    Interface science 6 (1998), S. 267-278 
    Details
    ISSN: 1573-2746
    Keywords: grain boundaries ; kinetics ; thermal activation ; activation entropy ; activation enthalpy ; compensation effect ; interfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Extensive experimental evidence is provided for the occurrence of the compensation effect, i.e., the linear dependence of the activation energy on the logarithm of the preexponential factor in interface kinetics, primarily grain boundary migration. It is proposed to attribute the compensation effect to a first order phase transition from the ground state to the activated state during thermal activation. The model is in line with the thermodynamic principles of phase transitions as well as the fundamentals of irreversible thermodynamics. It is capable of accounting for important phenomenological relations of interface kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008649619917
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    Interaction of newly defined stress intensity factors for angular corners in a row of diamond-shaped inclusions (1996)
    Springer
    International journal of fracture 82 (1996), S. 267-295 
    Details
    ISSN: 1573-2673
    Keywords: Stress intensity factor ; angular corner ; diamond-shaped inclusion ; singular integral equation ; body force method ; interface ; composite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper deals with a row of equally spaced equal diamond-shaped inclusions with angular corners under various loading conditions. The problem is formulated as a system of singular integral equations with Cauchy-type singularities, where the unknown functions are the densities of body forces distributed in infinite plates having the same elastic constants of the matrix and inclusions. In order to analyze the problems accurately, the unknown functions of the body force densities are expressed as a linear combination of two types of fundamental density functions and power series, where the fundamental density functions are chosen to represent the symmetric stress singularity of $$1/r^{1 - \lambda _1 } $$ and the skew-symmetric stress singularity of $$1/r^{1 - \lambda _2 } $$ . Then, newly defined stress intensity factors for angular corners are systematically calculated for various shapes, spacings, elastic constants and numbers of the diamond-shaped inclusions in a plate subjected to uniaxial tension, biaxial tension and in-plane shear. For all types of diamond-shaped inclusions, the stress intensity factor is shown to be linearly related to the reciprocal of the number of diamond-shaped inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013162
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    Numerical analysis of dynamic debonding under anti-plane shear loading (1997)
    Springer
    International journal of fracture 85 (1997), S. 265-282 
    Details
    ISSN: 1573-2673
    Keywords: Dynamic fracture ; spectral method ; interface ; boundary integral method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We present an efficient numerical scheme specially developed to simulate a wide variety of dynamic debonding problems under anti-plane shear loading conditions. The algorithm is based on an exact spectral representation of the elastodynamic relations between the interface stresses and displacements. It involves an explicit time stepping scheme with, for each time step, the use of FFT to link the spatial and spectral domains, and the computation of a convolution over the past displacement or velocity history. Two versions of the spectral algorithm are presented: in the first one, the elastodynamic response of each half space is investigated separately before the two solutions are linked with the aid of the interface continuity conditions. In the second approach, the interface conditions and the modulus mismatch are combined in a single bimaterial elastodynamic relation. Various problems involving stationary or rapidly moving interfacial cracks are investigated and contrasted with existing analytical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007498300031
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    High-speed self-similar debonding of an interface between two orthotropic materials: The anti-plane shear case (1997)
    Springer
    International journal of fracture 87 (1997), S. 119-137 
    Details
    ISSN: 1573-2673
    Keywords: dynamic fracture mechanics ; interface ; debonding ; crack ; dislocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The anti-plane problem of the transient debonding of an interface between two orthotropic materials is examined. The material principal axes are allowed to be oblique to the interface. The debonding is modeled as an interface crack propagating self-similarly from zero-length. The extending speed is assumed to be subsonic, transonic or supersonic. We first consider the dynamic debonding under the moving concentrated loading. The moving dislocation model of self-similar propagation of an interface crack is used to formulate the problem in a singular integral equation which is solved analytically. The stress singularity at the crack tips is discussed. The order of singularity is found to be one-half for subsonic debonding and to vary between zero and one-half depending on the crack speeds for transonic debonding. The dynamic stress intensity factors/coefficients for these two situations are presented in closed-form. The paper also concludes that supersonic debonding is impossible unless the loads are directly applied to the crack tips. Finally, the results for dynamic debonding under xn-type loads are presented by using the superposition method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007400728660
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    Interface Corner Failure Analysis of Joint Strength: Effect of Adherend Stiffness (1997)
    Springer
    International journal of fracture 88 (1997), S. 305-314 
    Details
    ISSN: 1573-2673
    Keywords: adhesive ; bond ; corner ; interface ; joint ; strength.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The strength of cylindrical butt joints, fabricated by bonding either aluminum or steel adherends together with an epoxy adhesive, has been determined for a wide range of bond thicknesses. Joint strength varied significantly with bond thickness. The measured strength of joints with steel adherends varied as the inverse cube root of bond thickness, while the strength of joints with aluminum adherends varied as the inverse fourth root of bond thickness. This bond thickness dependence is accurately predicted by an analysis that assumes failure occurs at a critical value of the interface corner stress intensity factor. The difference in the measured joint strength-bond thickness relation for joints with aluminum and steel adherends is a consequence of the difference in the order of the interface corner stress singularity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007436110715
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    Quantification of Geometry and Material Mismatch Constraint in Steel Weldments with Fusion Line Cracks (1999)
    Springer
    International journal of fracture 99 (1999), S. 211-237 
    Details
    ISSN: 1573-2673
    Keywords: Weldment ; steel ; interface ; fusion-line ; crack ; mismatch ; constraint.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Finite element analyses of an idealised steel weldment show that the constraint caused by geometry and material mismatch can be separated in a Modified Boundary Layer (MBL) model. The MBL model was loaded by a KI+T displacement field. Analyses of four fracture mechanics specimens revealed that the loss of constraint in the investigated weldments was different from the corresponding loss of constraint in a homogeneous reference case. Therefore, it was not possible to use the homogeneous reference to predict the development of constraint in the investigated weldments. In the fracture mechanics specimens the analyses show that the mismatch constraint is slightly reduced together with the loss of geometry constraint as large scale yielding develops in the specimens. By using the mismatch constraint determined from the MBL model, good predictions of the constraint in the specimens were obtained. In order to predict the fracture toughness in steel weldments with varying material mismatch and geometry constraint, three failure criteria have been compared. The results show that the RKR failure criterion by Ritchie et al. (1973) is applicable to the inhomogeneous material in this study. The study reveals that the mismatch effect on the failure predictions is influenced by the critical threshold stress used in the failure criteria. For all the investigated criteria, the mismatch effect on the predicted toughness was amplified by an elevation of the threshold stress. The constraint description has been used together with the RKR failure criterion to predict the required toughness (Jref) as a function of J for all the investigated geometries and mismatch cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018798010711
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    Viscosity of Strain Gradient Effects on the Kinetics of Propagating Phase Boundaries in Solids (1997)
    Springer
    Journal of elasticity 46 (1997), S. 53-90 
    Details
    ISSN: 1573-2681
    Keywords: phase transitions ; kinetics ; traveling waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The theory of thermoelastic materials undergoing solid-solid phase transformations requires constitutive information that governs the evolution of a phase boundary. This is known as a kinetic relation which relates a driving traction to the speed of propagation of a phase boundary. The kinetic relation is prescribed in the theory from the onset. Here, though, a special kinetic relation is derived from an augmented theory that includes viscous, strain gradient and heat conduction effects. Based on a special class of solutions, namely travelling waves, the kinetic relation is inherited from the augmented theory as the viscosity, strain gradient and heat conductivity are removed by a suitable limit process.
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    URL: http://dx.doi.org/10.1023/A:1007311302438
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    An Isoperimetric Inequality for the Torsional Rigidity of Imperfectly Bonded Fiber Reinforced Cylinders (1999)
    Springer
    Journal of elasticity 55 (1999), S. 1-10 
    Details
    ISSN: 1573-2681
    Keywords: Isoperimetric ; torsion ; imperfect bonding ; interface ; fibers.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An isoperimetric inequality for the torsional rigidity of imperfectly bonded, fiber reinforced cylinders is found. The fiber cross sections can be simply or multiply connected. The imperfect bonding conditions are given in terms of a flexible interface model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007606330007
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    Molecular dynamic simulation of amorphous carbon and graphite interface (1995)
    Springer
    Interface science 3 (1995), S. 85-100 
    Details
    ISSN: 1573-2746
    Keywords: carbon ; graphite ; interface ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Amorphous carbon/graphite interface is modeled by molecular dynamic simulation using a Tersoff-type potential function with the Brenner parameters for in-plane interaction combined with the pair potential function for the interplanar bonding. The interface is created by compressing the amorphous carbon produced in a separate simulation with perfect crystalline graphite terminated to expose (1120) planes. The planar structure and weak interplanar bonding allow the graphitic planes to deform in order to accommodate the bonds formed at the interface, which is consistent with the HRTEM study of the interface. The simulation indicates that the generated interface mostly consists of nearly sp2 hybridized bonding connecting the two sides. The bonds across the interface when formed are likely to maintain their equilibrium configurations. Due to the large interplanar spacing, many atoms both on the graphite and a-C sides are left unbonded leaving the interface energetically unfavorable with respect to the bulk. These unbonded radicals probably weaken the structural rigidity of the interface providing a fracture path under stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203984
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    Plane Elastic Problem of a Crack Normal to and Terminating at Bimaterial Interface of Isotropic and Orthotropic Half Plates (1997)
    Springer
    International journal of fracture 88 (1997), S. 393-406 
    Details
    ISSN: 1573-2673
    Keywords: Elasticity ; singularity ; crack ; interface ; anisotropy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, the displacement and stress fields for a crack normal to and terminating at a bimaterial interface of isotropic and orthotropic half planes are studied as a plane problem. The eigenequation, by which the order of stress singularity is determined, is given in an explicit form. A discriminant function is presented to judge whether the stress singularity at the crack tip is greater than -1/2 or not. An explicit closed form expression is derived for the displacement and stress distribution near the crack tip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007497200087
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    Griffith crack moving along the interface of two dissimilar piezoelectric materials (1998)
    Springer
    International journal of fracture 91 (1998), S. 197-203 
    Details
    ISSN: 1573-2673
    Keywords: interface ; Griffith crack ; piezoelectric material ; anti-plane fracture ; integral transform technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The problem of an anti-plane Griffith crack moving along the interface of dissimilar piezoelectric materials is solved by using the integral transform technique. It is shown from the result that the intensity factors of anti-plane stress and electric displacement are dependent on the speed of the Griffith crack as well as the material coefficients. When the two piezoelectric materials are identical, the present result will reduce to the result for the problem of an anti-plane moving Griffith crack in homogeneous piezoelectric materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007479401141
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    Analysis of crack extension paths and toughening in a two phase brittle particulate composite by the boundary element method (1998)
    Springer
    International journal of fracture 94 (1998), S. 177-188 
    Details
    ISSN: 1573-2673
    Keywords: Crack extension path ; boundary elements ; toughening ; interface ; crack/particle interaction ; two phase composite.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Crack extension in a two-phase composite consisting of a brittle matrix and cylindrical particles is simulated using a linear elastic boundary element program. Three crack extension paths: (i) deflection around the particle (ii) growing along the interface, and (iii) penetrating the particle are addressed. These depend on the elastic constant mismatch of the matrix and the particle. Toughening is considered through the ratio of the stress intensity factors. Cracks will readily grow along a weak matrix/particle interface, while a strong/stiff particle may force the crack to deflect around it, if the interface is strong. Inversely a crack easily penetrates a compliant particle. For the combination of a strong particle and a moderate strength interface, high toughening can be obtained when the crack tip is arrested. A strategy for the update of element configuration when the crack intersects the interface is also presented, which lays the foundation for analyzing the toughening promoted by ductile particles using the boundary element method based on elastoplastic mechanics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007591216796
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    A consideration of curved interfaces in stress-assisted martensite formation (1996)
    Springer
    Journal of elasticity 44 (1996), S. 271-284 
    Details
    ISSN: 1573-2681
    Keywords: martensite ; kinetics ; driving traction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A purely mechanical, sharp interface model is developed to consider curved interfaces that have been observed between martensite phase variants. The approach is based on a theory of small strains as distinct from small displacement gradients. It admits a realistic characterization of each phase with standard elasticity tensors and allows for inhomogeneous states of strain within each phase including inhomogeneous, finite rotations. The model indicates that any signficant interface curvature must be due to material rotation because interfaces cannot be finitely curved with respect to the material lattice. It is also found that the interface driving traction is not influenced by local lattice rotations unless inertia affects the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042136
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    Structure‐dependent viscoelastic properties of C9〉‐alkanethiol monolayers (1999)
    Springer
    Tribology letters 7 (1999), S. 67-71 
    Details
    ISSN: 1573-2711
    Keywords: alkanethiol ; self‐assembled monolayers ; quartz crystal microbalance ; viscoelasticity ; kinetics ; ellipsometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Quartz crystal microbalance techniques and in situ spectroscopic ellipsometry are used to probe the structure‐dependent intrinsic viscoelastic properties of self‐assembled CH3(CH2)8SH alkanethiol monolayers adsorbed from the gas phase onto Au(111)‐textured substrates. Physisorbed molecules, mixed chemisorbed‐fluid/solid phases and solid‐phase domain boundaries make sequentially dominant contributions to the measured energy dissipation in the growing monolayer. Deviations from Langmuir adsorption kinetics reveal a precursor‐mediated adsorption channel. These studies reveal the impact of structural heterogeneity in tribological studies of monolayer lubricants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019117319559
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