Abstract
AbstractA mobility profile describes the change of the solvent mobility with the distance from the surface of a suspended particle. By means of numerical integration on a computer, a relationship was found between such profiles and the concentration dependence of microviscosity in suspensions of cylinders (models for polymer segments in polymer solutions and gels) and spheres (e.g., protein molecules).The obtained relationship was used to calculate the mobility profile in aqueous solutions of hydroxyethyl cellulose and ribonuclease A. The influence of the macromolecules on the water mobility was found to change as the inverse distance to the power of 1.6 and 2.2, respectively. At a distance of 40 Å from the cellulose segment, or from the surface of the ribonuclease molecule, the mobility is reduced by 10% from that in bulk solvent.
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