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Huan J. Keh - One of the best experts on this subject based on the ideXlab platform.

  • Electrophoretic mobility and Electric Conductivity in suspensions of charge-regulating porous particles
    Colloid and Polymer Science, 2015
    Co-Authors: Hsin Y. Huang, Huan J. Keh
    Abstract:

    The electrophoresis and Electric conduction in a homogeneous suspension of charge-regulating porous spheres such as polyelectrolytes with uniformly distributed ionogenic functional groups and hydrodynamic resistance segments in an arbitrary electrolyte solution are analyzed. The charge regulation relationship between the local fixed-charge density and Electric potential because of association and dissociation reactions of the functional groups is linearized and a unit cell model allowing the overlap of the Electric double layers of adjacent particles is employed to take account of the effect of particle interactions under an applied Electric field. The equilibrium and perturbed Electric potential distributions are ascertained by solving the linearized Poisson-Boltzmann equation, whereas the external and internal fluid velocity fields are determined by solving the modified Stokes and Brinkman equations, respectively. Explicit formulas for the mean electrophoretic mobility of the particles and the effective Electric Conductivity of the suspension are obtained. The variation in the concentration of the charge-determining ions in the bulk solution can cause a reversal in the direction of the electrophoretic velocity and in the difference of the Electric Conductivity from its reference value for a suspension of neutral porous particles. The magnitude of the electrophoretic mobility decreases with increases in the volume fraction and resistance parameter of the porous particles, but the Electric Conductivity in general is not a monotonic function of the particle volume fraction.

  • Electric Conductivity of a Dilute Suspension of Charged Composite Spheres
    Langmuir, 1998
    Co-Authors: Yung C. Liu, Huan J. Keh
    Abstract:

    An analytical study of the effective Electric Conductivity of a dilute suspension of charged composite particles, each composed of a solid core and a surrounding porous shell, in an electrolyte sol...

  • The Electric Conductivity of Dilute Suspensions of Charged Porous Spheres
    Journal of colloid and interface science, 1997
    Co-Authors: Yung C. Liu, Huan J. Keh
    Abstract:

    The effective Electric Conductivity of a dilute suspension of polyelectrolyte molecules or charged flocs in an electrolyte solution is analytically studied. The model used for the particles is a porous sphere in which the density of hydrodynamic frictional segments, and therefore also that of the fixed charges, is constant. The equations which govern the electrochemical potential distributions of ionic species and the fluid flow field inside and outside a porous particle migrating in an unbounded solution are linearized assuming that the system is only slightly distorted from equilibrium. Using a perturbation method, these linearized equations are solved for a porous sphere in a uniform applied Electric field with the density of the fixed charges as the small perturbation parameter. An analytical expression for the effective Conductivity of a dilute suspension of identical charged porous spheres is obtained from the average Electric current density calculated using the solution of electrochemical potential distributions of the ions. The result demonstrates that the presence of the fixed charges in the porous particles can lead to an augmented or a diminished Electric Conductivity of the suspension relative to that of a corresponding suspension of uncharged porous particles, depending on the characteristics of the electrolyte solution and the suspending particles. When the anionic and cationic diffusion coefficients of a symmetric electrolyte are the same, the correction for the effect of the fixed charges of the particles on the Electric Conductivity of the suspension is proportional to the square of the fixed charge density. Copyright 1997Academic Press

Carsten Greiner - One of the best experts on this subject based on the ideXlab platform.

  • Electric Conductivity of the quark-gluon plasma investigated using a perturbative QCD based parton cascade
    Physical Review D, 2014
    Co-Authors: Moritz Greif, I. Bouras, Carsten Greiner
    Abstract:

    Electric Conductivity is sensitive to effective cross sections among the particles of the partonic medium. We investigate the Electric Conductivity of a hot plasma of quarks and gluons, solving the relativistic Boltzmann equation. In order to extract this transport coefficient, we employ the Green-Kubo formalism and, independently, a method motivated by the classical definition of Electric Conductivity. To this end we evaluate the static Electric diffusion current upon the influence of an Electric field. Both methods give identical results. For the first time, we obtain numerically the Drude Electric Conductivity formula for an ultrarelativistic gas of quarks and gluons employing constant isotropic binary cross sections. Furthermore, we extract the Electric Conductivity for a system of massless quarks and gluons including screened binary and inelastic, radiative 2 $ 3 perturbative QCD scattering. Comparing with recent lattice results, we find an agreement in the temperature dependence of the Conductivity.

Zhimin Dang - One of the best experts on this subject based on the ideXlab platform.

Qingzhong Xue - One of the best experts on this subject based on the ideXlab platform.

  • the influence of particle shape and size on Electric Conductivity of metal polymer composites
    European Polymer Journal, 2004
    Co-Authors: Qingzhong Xue
    Abstract:

    Abstract The effective Electric Conductivity of metal–polymer composite is investigated theoretically as a function of the Electric conductivities of the constituents, of the particle shape and size and of the volume of loading. And, in order to consider the interaction between the metal particles, a self-consistent way is used to improve this function. Firstly, the percolation threshold decreases rapidly with increasing the metal particles axial ratio and decreasing the metal particle size. Secondly, the dependence of the metal particle shape and size on the effective Electric Conductivity of metal–polymer composite is investigated. Finally, the theoretical results on the effective Electric Conductivity of tin–polypropylene composite are in good agreement with the experimental data.

  • The influence of particle shape and size on Electric Conductivity of metal–polymer composites
    European Polymer Journal, 2004
    Co-Authors: Qingzhong Xue
    Abstract:

    Abstract The effective Electric Conductivity of metal–polymer composite is investigated theoretically as a function of the Electric conductivities of the constituents, of the particle shape and size and of the volume of loading. And, in order to consider the interaction between the metal particles, a self-consistent way is used to improve this function. Firstly, the percolation threshold decreases rapidly with increasing the metal particles axial ratio and decreasing the metal particle size. Secondly, the dependence of the metal particle shape and size on the effective Electric Conductivity of metal–polymer composite is investigated. Finally, the theoretical results on the effective Electric Conductivity of tin–polypropylene composite are in good agreement with the experimental data.

Yung C. Liu - One of the best experts on this subject based on the ideXlab platform.

  • Electric Conductivity of a Dilute Suspension of Charged Composite Spheres
    Langmuir, 1998
    Co-Authors: Yung C. Liu, Huan J. Keh
    Abstract:

    An analytical study of the effective Electric Conductivity of a dilute suspension of charged composite particles, each composed of a solid core and a surrounding porous shell, in an electrolyte sol...

  • The Electric Conductivity of Dilute Suspensions of Charged Porous Spheres
    Journal of colloid and interface science, 1997
    Co-Authors: Yung C. Liu, Huan J. Keh
    Abstract:

    The effective Electric Conductivity of a dilute suspension of polyelectrolyte molecules or charged flocs in an electrolyte solution is analytically studied. The model used for the particles is a porous sphere in which the density of hydrodynamic frictional segments, and therefore also that of the fixed charges, is constant. The equations which govern the electrochemical potential distributions of ionic species and the fluid flow field inside and outside a porous particle migrating in an unbounded solution are linearized assuming that the system is only slightly distorted from equilibrium. Using a perturbation method, these linearized equations are solved for a porous sphere in a uniform applied Electric field with the density of the fixed charges as the small perturbation parameter. An analytical expression for the effective Conductivity of a dilute suspension of identical charged porous spheres is obtained from the average Electric current density calculated using the solution of electrochemical potential distributions of the ions. The result demonstrates that the presence of the fixed charges in the porous particles can lead to an augmented or a diminished Electric Conductivity of the suspension relative to that of a corresponding suspension of uncharged porous particles, depending on the characteristics of the electrolyte solution and the suspending particles. When the anionic and cationic diffusion coefficients of a symmetric electrolyte are the same, the correction for the effect of the fixed charges of the particles on the Electric Conductivity of the suspension is proportional to the square of the fixed charge density. Copyright 1997Academic Press