Transport coefficients for rigid spherically symmetric polymers or aggregates
نویسنده
چکیده
In this paper we investigate the m s p o r t proses for rigid spherically symmetric macromolecules, having a segment densiry distribution falling off as rrA. We calculate the rotational and translational diffusion coefficient for P spbaically symmetric polymer and the shear viscosiiy for a dilute suspension of these molecules, s m i n g from a continuum description based on the Debye-Brink" equation. Instead of numerid methods for solving equations we use peaurhative methods, especially methods from boundary-layer analysis. The calculations provide simple analytical formulae for Ule shear viscosity 0. and the translaiional and rotationid diffusion coefficients Dr and Dn. The results can also he applied to suspensions of other porous objects, such as aggregates of colloidal particles in which D = 3 A is called the fractill dimension of the aggregate.
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