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  • Articles  (7)
  • 61.70  (4)
  • adsorption  (3)
  • Springer  (7)
  • American Association for the Advancement of Science (AAAS)
  • 2005-2009
  • 1985-1989  (7)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
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  • Articles  (7)
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  • Springer  (7)
  • American Association for the Advancement of Science (AAAS)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
  • Physics  (5)
  • Chemistry and Pharmacology  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Dislocations in high-purity germanium and its relation to γ-ray detector performance (1986)
    Springer
    Applied physics 40 (1986), S. 257-261 
    Details
    ISSN: 1432-0630
    Keywords: 29 ; 61.70
    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 presence of dislocations in high-purity germanium influences the resolution of radiation detectors made from it. The four dislocation types found with electron microscopy are studied by DLTS to understand their influence on trapping in a γ-ray detector. Only three DLTS bands were found in commercially produced material. Statistical correlation with the detector resolution reported by various detector manufacturers finally yielded useful specifications with respect to the crystallographic perfection to be met in detector grade HP-Ge. The specification limits are discussed in view of the DLTS data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616604
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  • 2
    Electronic Resource
    Electronic Resource
    An adsorption effect on the gel strength of dilute gelatin-stabilized oil-in-water emulsions (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 933-934 
    Details
    ISSN: 1435-1536
    Keywords: Gelatin ; emulsion ; gel ; shear modulus ; adsorption
    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 incorporation of emulsion oil droplets into a gelatin gel leads to an initial increase in shear modulus at 25 °C for a gelatin concentration of 8 wt % but an initialdecrease for a concentration of 5 wt %. The latter result is consistent with a net lowering of the gelatin concentration available for gelation in the aqueous phase due to adsorption at the oil-water interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469632
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  • 3
    Electronic Resource
    Electronic Resource
    Photothermal ionisation spectroscopy of oxygen-related shallow defects in crystalline silicon (1989)
    Springer
    Applied physics 48 (1989), S. 41-47 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 78.30 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Shallow thermal donors are electrically active oxygen-related thermally formed defects observed in oxygen-rich silicon annealed between 300 ° and 600 ° C. Seven donors have been identified with an average central-cell correction of only 5 meV. In view of their molecule-like nature this close agreement to the effective mass theory prediction for a hydrogen-like donor in silicon is of interest. It is shown that these centres are not correlated to the residual impurities phosphorus and boron but rather to the presence of nitrogen. Nitrogen-doped oxygen-rich samples show increased shallow thermal donor growth and a reduction in the growth of other oxygen-related donors in comparison to normally nitrogen-undoped oxygen-rich samples. A reduction in shallow thermal donor concentration at high nitrogen concentrations is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617762
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature characteristics of positron trapping at defects in electron-irradiated silicon (1989)
    Springer
    Applied physics 49 (1989), S. 659-664 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 61.80 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron-annihilation lifetime and Doppler-broadening measurements are used to investigate defects in silicon irradiated at 373 K with 6 MeV electrons to a dose of 1×l019e/cm2. In the unirradiated silicon sample (p type) a temperature-independent behaviour of the bulk-lifetime is observed in the temperature interval 110–500 K with a constant value of 220±1 ps. The slight effect observed on the S-parameter evolution is explained taking into account the thermal expansion of the lattice. The lifetime results obtained at 80 K and at 300 K after isochronal annealing as well as the behaviour of the intensity of the second lifetime componentI 2 during lifetime measurements below the irradiation temperature in the irradiated silicon sample (n type), clearly indicate the temperature dependent characteristics of the positron trapping cross section σt(T) ∝T n withn= −1.905±0.016. From isochronal annealing results, an annealing stage is observed in which di-vacancies agglomerate into quadri-vacancies. The mean positron lifetime in those quadri-vacancies is 350 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616990
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  • 5
    Electronic Resource
    Electronic Resource
    Electrical properties of novel mixed-conducting oxides (1989)
    Springer
    Applied physics 49 (1989), S. 25-31 
    Details
    ISSN: 1432-0630
    Keywords: 81.20 ; 66.30 ; 72.60 ; 61.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Zirconia-titania-yttria oxide solutions are novel mixed-electrical conductors in which both oxygen-ions and electrons are mobile. A determination of their electrical properties is necessary for an evaluation of their potential applications. Single-phase oxide solutions have been prepared and characterized. Phase studies indicates extensive solid solution of titania into zirconia stabilized with 12 mol % yttria. The observed decrease in lattice parameter with increasing titania concentration in these oxide solutions indicates that titanium cations substitute for the zirconium cations in the fluorite lattice. The lattice and grain-boundary electrical conductivities have been determined using impedance spectroscopy at temperatures between 400 and 950 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615461
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of the interaction between gelatin and a spread monolayer of octadecanoic acid (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 778-781 
    Details
    ISSN: 1435-1536
    Keywords: Gelatin ; ionic surfactants ; adsorption ; surface rheology ; octadecanoic acid
    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 Surface rheological measurements of octandecanoic acid monolayers spread on gelatin solutions were performed. The interaction of the spread monolayer with the gelatin involves a strong rise of the solidity of the surface structure with distinct viscoelastic properties and is comparable with the experimental findings looking into the interaction between gelatin and an ionic surfactant. The results found by the addition of sodium-dodecylsulfate to the gelatin solution are discussed, assuming the formation of a multilayer consisting of octadecanoic acid molecules interacting to a negligible degree with the gelatin-surfactant complexes displaced from the surface. The surface rheological parameters are influenced by both layers in opposition to the dynamic behaviour at compression and dilation described in the first part of this paper. An analogous effect is found if the cationic hexadecyltrimethylammoniurn-bromide is added to the gelatin solution. The influence of CTAB is interpreted as the consequence of a steric hindrance, caused by the concentration of groups with opposite charges on the small polar ranges of the gelatin molecules. As a particular interaction of octadecanoic acid with the complexes is possible, a mixed adsorption layer is formed and the high solidity of the surface layer is prevented by the presence of molecules not interacting with the complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01422862
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  • 7
    Electronic Resource
    Electronic Resource
    Polyacrylamide Na-kaolinite interactions: Effect of electrolyte concentration on polymer adsorption (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 889-896 
    Details
    ISSN: 1435-1536
    Keywords: Polyacrylamide ; kaolinite ; clay-polymercomplex ; adsorption
    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 variation in polyacrylamide adsorption on Na-kaolinite as a function of the electrolyte concentration of the clay suspension, was determined under three pH conditions, where the clays display varying charge characteristics. Interpretation of the results is based on two arguments: non-charged polyacrylamide adsorption is restricted to the edge faces of the colloidal platelets and hydrogen bonding between the amide groups of the polymer and the “isolated” hydroxyl sites of these faces is the mode of surface attachment. At constant pH, when Na-kaolinite bears charged surface groups, the polymer adsorption, which is related to the density of the anchoring sites, parallels the state of ionization of the edge surface. The mechanism by which the salt modifies the adsorption properties of the kaolinite in neutral medium is not established with certainty. Nevertheless, no polymer-clay association occurs if the surface is entirely uncharged. This result is in line with the fact that while hydroxyl groups are engaged in internal hydrogen bonds, they cannot hydrogen-bond to the polyacrylamide. Variations in the clay-polymer affinity are attributed to a modification of the interfacial structure of the adsorbed polymer, associated with changes in the surface density of the anchoring groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421817
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