Diffusion of a Single Polymer Chain in Colloidal Suspensions in Narrow Channels
نویسندگان
چکیده
It is known that the addition of soluble polymer to colloidal dispersions, even in small amounts, has a significant effect on transport properties of colloids. However the effect of colloids on the dynamics of polymer has not been investigated. Transport properties of macromolecules in confined geometries, especially in narrow channels, offer many technological applications in processes such as membrane filtration and gel electrophoresis. A good starting point to obtain quantitative results for the translational diffusion rate of the center of mass of a polymer in solution is the Kirkwood formula. We extend the treatment of Harden and Doi where no colloid is in the solution to the case where polymer is immersed in a colloidal solution, focusing on the diffusion of a linear flexible chain in a narrow cylindrical channel.
منابع مشابه
Similarities in the Dynamics of Suspensions of Mo no disperse Colloidal Chains with Different Lengths Confined in the Thin Films
We perform the extensive Brownian dynamics simulations on the suspensions of the monodisperse magnetic colloidal chains confined in the thin films at several different area fractions. It is shown that the long-time self-diffusion coefficients of the colloidal chains with different chain lengths converge on the single master curve, even though the area fraction of the chains is different. We als...
متن کاملDynamics of polymers in flowing colloidal suspensions.
Using hydrodynamic simulations we examine the behavior of single polymers in a confined colloidal suspension under flow. We study the conformations of both, collapsed and noncollapsed polymers. Our results show that the presence of the colloids has a pronounced effect on the unfolding and refolding cycles of collapsed polymers, but does not have a large effect for noncollapsed polymers. Further...
متن کاملUnusual swelling of a polymer in a bacterial bath.
The equilibrium structure and dynamics of a single polymer chain in a thermal solvent is by now well-understood in terms of scaling laws. Here, we consider a polymer in a bacterial bath, i.e., in a solvent consisting of active particles which bring in nonequilibrium fluctuations. Using computer simulations of a self-avoiding polymer chain in two dimensions which is exposed to a dilute bath of a...
متن کاملEFFECT OF ELECTRIC FIELD ON PD ACTIVITY AND DAMAGE INTO SOLID DIELECTRIC MATERIALS
Abstract – In this paper, the effect of applied electric field on the damage due to partial discharges activity into the surroundings dielectrics of a narrow channel encapsulated within the volume of a dielectric material is evaluated using a kinetic model based on Particle in Cell - Monte Carlo Collision (PIC-MCC) model. After application of an electric field across a dielectric material which...
متن کاملSingle-file diffusion of colloids in one-dimensional channels
Single-file diffusion, prevalent in many processes, refers to the restricted motion of interacting particles in narrow micropores with the mutual passage excluded. A single-filing system was developed by confining colloidal spheres in one-dimensional circular channels of micrometer scale. Optical video microscopy study shows evidence that the particle self-diffusion is non-Fickian for long peri...
متن کامل