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  • 1
    Electronic Resource
    Electronic Resource
    Identification of modes in dynamic scattering from ternary polymer mixtures and interdiffusion (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 4408-4422 
    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/ma00015a025
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  • 2
    Electronic Resource
    Electronic Resource
    Remarks on the "fast" and "slow" mode theories of interdiffusion (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 6680-6683 
    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/ma00123a040
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamics and sedimentation velocity in charge-stabilized colloidal suspensions (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 963-979 
    Details
    ISSN: 0392-6737
    Keywords: Colloids ; Statistical theories of liquid structure ; Time-dependent properties ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Charge-stabilized suspensions are characterized by the strong electrostatic interactions between the particles so that rather dilute systems may exhibit strong correlation resulting in a well-developed short-range order. This microstructure, quantitatively described by the pair distribution functiong(r), is rather different from that of (uncharged) hard spheres. It is shown how this difference affects the «hydrodynamic function»H(k), which appears in the expression for the first cumulant Γ(k)=k 2 D eff(k)=k 2 H(k)/S(k) of the dynamic autocorrelation function. Without hydrodynamic interaction,H(k)=D 0, which is the free-diffusion coefficient. Using pairwise additive hydrodynamic interaction and the lowest-order many-body theory of hydrodynamic interaction, it is found thatH(k) can deviate considerably fromD 0 even for systems of volume fractions ϕ as low as 10−3. These effects are more pronounced for collective diffusion than for self-diffusion. SinceH(k=0) is closely related to the sedimentation velocity, we have studied this quantity as a function of volume fraction. It is found that (H(0)/D 0) −1 scales asφ 1/3 at low ϕ in salt-free suspensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458782
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  • 4
    Electronic Resource
    Electronic Resource
    Structural properties of solutions of spherical micelles: Effect of finite size of small ions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2560-2568 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effects of a finite size of the small ions (counterions and ions of 1–1 electrolytes added to the supporting solution) on the structural properties of solutions of spherical micelles are studied. This study is based on the primitive model of the solution and the mean spherical approximation. The structure obtained using the primitive model is contrasted with that of the one component macrofluid model for these systems. At high ionic strengths, interesting effects are observed in the short-range correlations between the macroparticles, directly related with the finite size of the small ions. Similar effects are also observed on the structure of the electrical double layer around each macroparticle. The consequences of these results for the interpretation of recent neutron scattering experiments from ionic micellar systems are briefly discussed. It is found that for small amounts of added salt a given experimental structure factor can be reproduced with a smaller effective charge on a micelle in the present model than in the previously used one-component macrofluid model. For large amounts of added salt, however, the finite size of the small ions may give rise to the opposite trend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449250
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  • 5
    Electronic Resource
    Electronic Resource
    Cooperative diffusion in colloidal mixtures (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7037-7052 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this work we develop a general method to examine cooperative diffusion, i.e., the partial dynamic structure factors, in multicomponent colloidal mixtures of spherical particles. Using a multivariable projection operator formalism based on the many-body Smoluchowski diffusion equation, we derive an exact microscopic expression for the matrix of irreducible memory functions associated with the partial dynamic structure factors and the long-time cooperative diffusion coefficients of the system. Starting from this microscopic expression, we present a derivation of a self-consistent mode coupling scheme (MCS) for cooperative diffusion in colloidal mixtures. This scheme accounts not only for the direct particle interactions, but also for the far-field part of the solvent mediated hydrodynamic interactions. Combined with our recent work on the mode coupling theory of tracer–diffusion and linear viscoelasticity of colloidal suspensions, this MCS provides a unified method for calculating dynamic and low-shear rheological properties of multicomponent colloidal dispersions. The MCS can be used to study polydispersity and mixing effects in concentrated colloidal systems. Some applications related to cooperative diffusion, interdiffusion, and glass transition in binary mixtures are discussed to illustrate the method. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478609
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  • 6
    Electronic Resource
    Electronic Resource
    Linear viscoelasticity of colloidal mixtures (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 9893-9904 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this work we develop a unifying and general method for calculating linear viscoelastic properties of multicomponent colloidal mixtures of spherical particles. Using linear response theory based on the many-body Smoluchowski diffusion equation, we derive an exact expression for the zero shear rate shear relaxation function, together with a Green-Kubo formula for the static shear viscosity. From these results, we obtain an exact expression for the high frequency elastic shear modulus of colloidal mixtures. We present, in addition, the first derivation of a self-consistent mode coupling scheme for the linear viscoelasticity of concentrated colloidal mixtures. This scheme offers the opportunity for a unified description of linear viscoelasticity and diffusion mechanisms. It accounts further for polydispersity and mixing effects, and leads naturally to a diverging shear viscosity at a glass transition point. Various limiting cases are considered to assess the accuracy of the approach. It is shown to be a valuable method for evaluating the rheological properties of concentrated colloidal mixtures. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476428
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  • 7
    Electronic Resource
    Electronic Resource
    Hard spheres versus Yukawa particles: Differences and similarities (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 31-39 
    Details
    ISSN: 1435-1536
    Keywords: Self-diffusion ; collective ; diffusion ; hydrodynamic interactions ; charge stabilized suspensions ; effective hard spheres
    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 Whereas structural properties of suspensions of hard spheres of diameterσ are well approximated by analytic expressions, it is necessary to use numerical solutions of integral equations to calculate these properties when the pair potentials have a soft part. The finite range of repulsive pair potentials gives rise to a correlation hole, meaning that the pair correlation functiong(r) is essentially equal to zero up to a well-defined nearestneighbour separation larger thanσ. The aim of this work is to show that because of the correlation hole various dynamic properties of chargestabilized suspensions are qualitatively different from those of hard spheres. It will be argued that the observed non-linear volume fraction dependencies of the shorttime self-diffusion coefficients and of the sedimentation velocity can be understood in terms of a model of effective hard spheres with diameterσ EHS which depends on the volume fraction. Moreover, the long-ranged electrostatic repulsion gives rise to an unexpected enhancement of the longtime self-diffusion coefficient due to hydrodynamic interactions, in contrast to what is known for hard spheres. This enhancement is also understood in terms of an effective hard sphere model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182412
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  • 8
    Electronic Resource
    Electronic Resource
    Diffusion of colloids at short times (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 168-172 
    Details
    ISSN: 1435-1536
    Keywords: Translational diffusion ; rotational diffusion ; hydrodynamic ; interaction ; charge-stabilized ; colloidal suspensions
    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 We study the combined effects of electrostatic and hydrodynamic interactions (HI) on the short-time dynamics of chargestabilized colloidal spheres. For this purpose, we calculate the translational and the rotational selfdiffusion coefficients, D s t and D s r , as function of volume fractionφ for various values of the effective particle chargeZ and various concentrations ns of added 1−1 electrolyte. Our results show that the selfdiffusion coefficients in deionized suspensions are less affected by HI than in suspensions with added electrolyte. For very large ns, we recover the well-known results for hard spheres, i.e. a linearφ-dependence ofD s t andD s r at smallφ. In contrast, for deionized charged suspensions at smallφ, we observe the interesting non-linear scaling propertiesD s t ∝ 1−atφ4/3 andD s r ∝ 1−arφ2. The coefficients at and ar are found to be nearly independent ofZ. The qualitative differences between the dynamics of charged and uncharged particles can be well explained in terms of an effective hard sphere (EHS) model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182441
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  • 9
    Electronic Resource
    Electronic Resource
    On rheological properties of charge-stabilized spherical colloids (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 437-440 
    Details
    ISSN: 1435-1536
    Keywords: Rheological properties ; static scattering ; suspensions ofcharged particles
    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 Exact relations are derived which represent the high-frequency elastic moduli of colloidal suspensions of charged spherical particles in terms of integrals of the static structure factor. The only assumptions are the form of the interparticle potential as a screened Coulomb potential and a sufficiently high charge per macroion so that the radial distribution function at contact is zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01457260
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  • 10
    Electronic Resource
    Electronic Resource
    Sozioökonomische Rahmenbedingungen (1998)
    Springer
    Zeitschrift für Gerontologie + Geriatrie 31 (1998), S. 375-376 
    Details
    ISSN: 0044-281X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003910050062
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