Configurational effects on membrane rejection
Configurational effects on membrane rejection
复制标题
DOI：
10.1016/s0376-7388(00)85114-5
复制
发表时间：
1981
影响因子：
9.5
通讯作者：
T. Long;D. Jacobs;J. L. Anderson
中科院分区：
文献类型：
--
作者：
T. Long;D. Jacobs;J. L. Anderson
The reflection coefficients of rigid macromolecules (polystyrene latex and tobacco mosaic virus) and partially flexible macromolecules (branched dextrans) were experimentally determined by ultrafiltration with membranes having a capillary pore structure. The experiments were performed at very low ultrafiltration velocities to keep effects of membrane polarization negligible. Results for the neutral dextrans are in agreement with a theory for hard spheres if their equivalent radius is based on intrinsic viscosity. The measured rejection rates for the virus, which is a long cylinder about 150 Å in diameter, also agree with the theory, once corrections are made to account for particle shape and polydispersity of the particle lengths. The data for the latex particles (425 Å radius) and blue dextran (molecular weight 2 x 106) are more difficult to interpret because of adsorption to the membrane. After the pore radius is adjusted to account for adsorption, the latex data show fair agreement with the hard sphere theory. A possible explanation for the high rejection of latex is constriction of the pore structure due to adsorption of these particles.
