期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 269, 期 1, 页码 255-258出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9797(03)00600-3
关键词
electrophoretic mobility; soft particle; salt-free medium
A theory is presented for the electrophoretic mobility g of dilute spherical soft particles (i.e., polyelectrolyte-coated particles) in salt-free media containing only counterions. As in the case of other types of particles (rigid particles and liquid drops) in salt-free media, there is a certain critical value of the particle charge separating two cases, the low-surface-charge case and the high-surface-charge case. For the low-charge case, the mobility is proportional to the particle charge and coincides with that of a soft particle in an electrolyte solution in the limit of very low electrolyte concentrations kappa --> 0 (Huckel's limit), where kappa is the Debye-Huckel parameter. For the high-charge case, however, mu becomes essentially constant, independent of the particle charge, due to the counterion condensation effect. (C) 2003 Elsevier Inc. All rights reserved.
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