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  • 1995-1999  (1)
  • 1985-1989  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Hard sphere colloidal dispersions: Viscosity as a function of shear rate and volume fraction (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4717-4725 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The viscosities of suspensions of sterically stabilized (hard) silica spheres in cyclohexane are reported as a function of shear rate (γ(overdot)) and volume fraction (6×10−4〈φ〈0.6). The shear thinning scales according to (ηr−η∞)/(η0−η∞) =1/(1+1.31ηγ(overdot)a3/kT) with limiting low and high shear viscosities described up to φ∼0.35 by η0=1+5/2φ+(4±2)φ2+(42±10)φ3 , η∞=1+5/2φ+(4±2)φ2+(25±7)φ3 . At higher volume fractions the viscosity becomes more sensitive to φ and diverges at φm=0.63±0.02 (γ(overdot)→0) , φm=0.70±0.02 (γ(overdot)→∞) . The experimental results compare well with existing hard sphere theories and the data of Krieger (1972) for aqueous lattices. Even at the highest volume fraction neither yield stresses nor shear thickening are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448997
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonequilibrium statistical mechanics of concentrated colloidal dispersions: Hard spheres in weak flows (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1815-1826 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We formulate a theory for the nonequilibrium structure and stresses in a sheared suspension with a fluid rest state. Many body interactions are handled exactly in the thermodynamics but truncated at the pair level for the hydrodynamics. Evaluation for hard spheres in weak flows demonstrates the importance of stresses arising from the nonequilibrium structure and explains the shear rate dependence observed at volume fractions greater than 0.25–0.30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450428
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An asymptotic description of transient settling and ultrafiltration of colloidal dispersions (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 82-100 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sedimentation and ultrafiltration are important processes for removing solids from suspensions. The Kynch theory describes the transient settling of noncolloidal particles forming an incompressible sediment by providing a solution to the convective conservation equation. This solution predicts the existence of several different regions as settling progresses. Subsequent treatments have accounted for compressibility within the sediment. These modifications focus largely on stretching the Kynch theory to fit the problem at hand rather than on formulating a new model to include the relevant physics. In this paper a model of sedimentation for colloidal systems is presented by including a diffusion term in the governing equation. In the regions above the sediment, this term acts as a small perturbation to the Kynch theory. Within the sediment, owing to the high solid volume fraction, diffusion is comparable to convection. Slow compression to the maximum sediment volume fraction contrasts the incompressibility of the Kynch theory. Application of the method of matched asymptotic expansions to the conservation equation enables the formulation of a complete description of the settling process, and, in particular, the volume fraction evolution in the sediment. This method is also applied to the related ultrafiltration process. Where the properties of the sediment, or filtercake, are important, such as in ceramics manufacturing, a quantitative understanding of its formation is of obvious value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857526
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Intrinsic viscosity and Huggins coefficients for potassium poly(styrenesulfonate) solutions (1987)
    s.l. : American Chemical Society
    Macromolecules 20 (1987), S. 518-525 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00169a009
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization of hard-sphere colloids in microgravity (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 387 (1997), S. 883-885 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The structure of, and transitions between, liquids, crystals and glasses have commonly been studied with the hard-sphere model, in which the atoms are modelled as spheres that interact only through an infinite repulsion on contact. Suspensions of uniform colloidal polymer particles are good ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/387883a0
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  • 6
    Electronic Resource
    Electronic Resource
    Integral sorption with induced crystallization (1986)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 26 (1986), S. 1066-1078 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: We studied the integral sorption of saturated, organic vapors in amorphous films of poly (ethylene terephthalate) (PET) using a spring balance apparatus. The penetrants employed (methylene chloride [MeCl2] and N. N. dimethyl formamide [DMF]) induce substantial crystallization of the polymer during sorption. The experimental data (mass of vapor absorbed versus exposure time) do not obey Fick's law for diffusion but reflect the influence of time dependent polymer swelling and crystallization. The data show that polymer swelling controls the penetrant transport in thin films, while molecular diffusion in the highly swollen semi-crystalline polymer controls in thick films. Small activation energies were found for transport in thin films suggesting that ductile deformation controls the swelling in PET. A mathematical model developed previously explains the important features of the experiments.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760261507
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    On the theory of dilute polyelectrolyte solutions: Extensions, refinements, and experimental tests (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 511-533 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We synthesize a quantitative theory for the radius of gyration, second virial coefficient, intrinsic viscosity, and friction coefficient for polyelectroytes in dilute solution from existing treatments of electrostatic and hydrodynamic interactions within and among wormlike chains. Comparison with data for K-PSS demonstrates the importance of accounting for nonlinearities in the electrostatics and the finite diameter of the polymer backbone.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240304
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  • 8
    Electronic Resource
    Electronic Resource
    Solvent-induced crystallization. II. Morphology (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1341-1360 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Morphology of quenched poly(ethylene terephthalate) (PET) films crystallized by low-molecular-weight organic penetrants is studied by scanning electron microscopy. Films with thicknesses from ca. 1 mil (0.0025 cm) to ca. 35 mil (0.1 cm) were exposed to methylene chloride (MeCl2) and N,N-dimethylformamide (DMF) in the temperature ranges 0-38°C and 22-70°C, respectively. The effects on the surface and internal structures of contact with liquids and saturated vapors were examined. Severe porosity at the surface results from contact with the liquids, but only minor surface roughness appears following contact with vapors. Internal porosity developed in the thinnest films (ca. 1 mil) during crystallization in liquid environments. Here, the internal void fraction is greatest along the film centerline and decreases with increasing crystallization temperature. A mathematical model discussed previously accounts for the observed behavior.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240611
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Solvent-induced crystallization. I. Crystallization kinetics (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1321-1340 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of crystallization of quenched poly(ethylene terephthalate) (PET) films during the imbibition of methylene chloride (MeCl2) vapor is studied by density measurements. The effects of film thickness (0.0025-0.086 cm) and temperature (0-38°C) were examined. The data suggest that MeCl2 transport controls the crystallization in thick films and at elevated temperatures, but that spherulite growth controls in thin films and at reduced temperatures. The application of a mathematical model developed previously supports this mechanistic interpretation of the data.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240610
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    Paper (German National Licenses)
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