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  • 1
    Electronic Resource
    Electronic Resource
    Prediction and correlation of accessible area of large multiparticle aggregates (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 1167-1182 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aggregates (composed of large numbers of primary particles) are produced in many engineering environments. One convenient characterization is the fractal dimension, the exponent describing how the number of primary particles in each aggregate scales with radial distance from its center of mass. We describe a finite-analytic pseudo-continuum prediction of the normalized accessible surface area of an isothermal quasi-spherical fractal aggregate containing N (≫ 1) primary particles, on the surfaces of which a first-order chemical process occurs. Results are displayed for specific fractal dimensions (2.5, 2.18, and 1.8) frequently observed in aggregating systems. An effective Thiele modulus is used to develop an efficient and accurate scheme for predicting/correlating the effectiveness factor for an aggregate containing N primary particles in terms of aggregate fractal dimension, reaction probability, and Knudsen number. Our methods now allow calculations of the accessible surface area of populations of aggregates, provided pdf \documentclass{article}\pagestyle{empty}\begin{document}$ \rlap{--} \rlap{--} ($\end{document}N, Df, …\documentclass{article}\pagestyle{empty}\begin{document}$ \rlap{--})$\end{document} is known for the populations of interest.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400708
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  • 2
    Electronic Resource
    Electronic Resource
    Rapid estimation of cylinder erosion rates in abrasive dust-laden streams (1995)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 41 (1995), S. 1081-1098 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Erosion yield data for particular combinations of target and projectile materials (via laboratory experiments carried out with a narrow-size distribution over the important range of impact velocities and incidence angles), together with recently developed rational correlations for inertial impaction of suspended particles on a cylinder in high Reynolds number crossflow are used to provide a tractable framework for predicting the erosion rates of, say, heat exchanger tubes immersed in particle-laden streams of combustion products.“Universal” results are cast in terms of the following accessible parameters: sensitivity of erosion yield to projectile incident velocity and angle, ratio of mean particle size to the threshold size required for impaction on the cylindrical target, spread of the mainstream particle size distribution (here log-normal), and the characteristic “slip” Reynolds number for the critical size abrasive particle in the mainstream. Applications of the results are illustrated, and several generalizations are discussed.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690410505
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on binuclear Schiff base derivatives having a Si—O—Sb (V) linkage (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 513-515 
    Details
    ISSN: 0268-2605
    Keywords: Schiff base ; antimony ; silicon ; complexes ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Schiff base derivatives of the type Ph3Si—O—Sb(NO)Ph3 (where NO represents the donor system of a monobasic bidentate ligand) have been synthesized. These are obtained as coloured solids; they are non-electrolytes and monomeric in nature, and have been characterized by elemental analysis, IR and 1H NMR. Spectral studies suggest that silicon and antimony atoms are in tetra- and hexa-coordinated states, respectively.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060607
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  • 4
    Electronic Resource
    Electronic Resource
    Antimicorbial effects of newly synthesized organotin(IV) and organolead(IV) derivatives (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 7 (1993), S. 655-660 
    Details
    ISSN: 0268-2605
    Keywords: Triorganotin(IV) complexes ; triorganolead(IV) complexes ; semicarbazones ; antimicrobial studies ; NMR ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Triorganotin(IV) and triorganolead(IV) derivatives of the types Me3Sn(SCZ) and Ph3Pb(SCZ) (where SCZ- is the anion of a semicarbanzone ligand) have been synthesized by substitution reactions of trimethyltin chloride and triphenyl-lead chloride with semicarbazones derived from heterocyclic ketones. The resulting complexes have been characterized by elemental analyses, molecualr weight determinations and conductivity measurements. The mode of bonding has been established on the basis of infrared and 1H, 13C and 119Sn NMR spectroscopic studies. Some respresentative complexes have also been evaluated for their antimicrobial effects on different species of pathogenic fungi and bacteria; the results of these investigations have been reported in the present paper.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590070809
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  • 5
    Electronic Resource
    Electronic Resource
    Fungicidal, bactericidal and antifertility activities of diorganosilicon(IV) complexes derived from benzothiazolines (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 9 (1995), S. 127-132 
    Details
    ISSN: 0268-2605
    Keywords: organosilicon complexes ; Schiff base ligands ; benzethiazolines ; antifungal ; antibacterial and antifertility activities ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthetic, structural and biological aspects of trigonal-bipyramidal, Me2S(N - S)CI and octahedral, Me2Si(N - S)2 types of diorganosilicon(IV) complexes of heterocyclic benzothiazolines (N - SH) are described. The complexes were characterized by elemental analysis, molecular weight determination, conductance measurements and electronic, infrared, 1H and 13C NMR spectroscopic studies. Some ligands and their corresponding dimethylsilicon(IV) complexes have been tested for their effects on several pathogenic fungi and bacteria and found to be quite active in this respect. Antifertility activity in male mice of some representative ligands and their silicon complexes was also evaluated and discussed.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590090206
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of aspect ratio of inclusions on the elastic properties of unidirectionally aligned composites (1984)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 5 (1984), S. 327-333 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper examines the influence of aspect ratio α, from zero to infinity, on the effective elastic moduli of a transversely isotropic composite. The reinforcing inclusions, which could be flakes or short fibers, are assumed to be spheroidal and unidirectionally aligned. Of the five independent elastic constants, the longitudinal Young's modulus E11 and in-plane shear modulus μ12 appear to increase with increasing aspect ratio, while the transverse Young's modulus E22, out-plane shear modulus μ23, and plane-strain bulk modulus K23, generally decrease. It is further noted that E11 is more sensitive to α when α 〉 1 but the others are more so when α 〈 1. The present analysis was carried out by the combination of Eshelby's and Mori-Tanaka's theories of inclusions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750050413
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  • 7
    Electronic Resource
    Electronic Resource
    Morphological evolution of nanoparticles in diffusion flames: Measurements and modeling (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 2641-2649 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The morphological evolution of flame-generated “primary” spherules and inorganic aggregates was studied at low particle volume fractions [O(10-1 ppm)] in a welldefined/characterized laminar nonpremixed combustion environment which produces particle heating rates of 104 K/s. Pure Al2O3 particles synthesized in an Al(CH3)3 (TMA-) seeded atmospheric pressure laminar counterflow diffusion flame “fueled” with CH4/O2/N2 were used as the model material/combustion system. Experimental techniques included spatially resolved laser light scattering (LLS) and thermophoretic sampling/transmission electron microscopy. Local aggregate morphology was characterized in terms of spherule (“grain”) size, aggregate size, aggregate shape and fractal structure. Effects of flame temperature and TMA concentrations on particle inception location, sizes and morphology studied systematically were interpreted based on parallel theoretical studies. LLS signals and TEM images show particle/aggregate size and morphology evolution as a result of two competing rate processes. Mean spherule diameters prior to high-temperature coalescence are explained in terms of the strong size dependence of nanoparticle restructuring kinetics due to surface melting, even at 500 K. Mean fractal aggregate sizes reached only 15-27 spherules near a local temperature of only 1,250 K. Final particulate products were isolated spherical particles resulting from complete “collapse” of the aggregates in an interval of only 24 ms immediately upstream of the maximum gas temperature (2,280 K). Experimental results are compatible with the characteristic times governing each participating “unit” rate process. Some of these methods can be applied in controlling the larger-scale synthesis of valuable nanopowders and guide rational extensions into the domain of turbulent nonpremixed combustors generating ultrafine particles of tailored composition and morphology at high mass loadings.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690431307
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  • 8
    Electronic Resource
    Electronic Resource
    Codeposition on hot CVD surfaces: Particle dynamics and deposit roughness interactions (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 1673-1684 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: To capture in a tractable manner essential coupling effects in CVD systems when particles generated in thermal boundary layers also deposit, a film theory was developed that predicts simultaneous vapor and particle deposition rates at a hot deposition surface. The codeposition rate prediction method also calculates for the first time the corresponding solid deposit roughness using recently published results of particle-level simulations. For the numerical illustrations, the growth of TiO2(s) films by the codeposition of titanium tetra-isopropoxide vapor and film-nucleated/grown TiO2 particles (generated in the thermal boundary layer) was considered. Experimental rate data for this system are available. The continuum and particle-level simulation methods provide: the interplay of vapor precursor kinetics, particle nucleation, growth, coagulation and diffusion in determining the complex “structure” of such multiphase chemically reacting boundary layers; wall deposition rates of both surviving vapors and film-nucleated particles; and the “self-consistent” microstructure (surface roughness) of the resulting solid deposit. Timely and tractable generalizations are discussed in the light of recent results for the transport properties and stability of “fractal-like” aggregated particles.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420619
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  • 9
    Electronic Resource
    Electronic Resource
    Simulation of molecular weight distribution and cyclic oligomer formation in the polymerization of nylon 6 (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 2153-2163 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The reversible polymerization of nylon 6 including ring opening, polycondensation, polyaddition, and cyclization reactions as well as the reaction with monofunctional acids was simulated for an isothermal batch reactor at 235°C. The cyclic oligomer concentrations, the molecular weight distributions, and its moments have been computed using a chain length-dependent equilibrium constant for the cyclization reaction. Even though the cyclization step does not influence the monomer conversion considerably, it does effect the molecular weight distribution and its moments.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260704
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  • 10
    Electronic Resource
    Electronic Resource
    A rheological study of laminar-turbulent transition in drag reducing polymeric solutions (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 4235-4242 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Presented herein are the studies of laminar-turbulent transition in micropolar and power law fluids flowing in a circular pipe. For some parametric values of micropolar and power law fluids, both depict the drag reducing properties. The parametric values of these representations have been obtained from the experimental results of Mc-Comb. It has been observed that, in both the cases, as the drag-reducing property in the solution increases, the first transition point moves towards the walls of the pipe. It is also observed that the onset of early turbulence phenomenon occurs for the drag-reducing polymeric solutions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070301102
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