Counterion condensation and rapid transport of polyelectrolytes through aqueous polymer solutions

Colloids and Surfaces A: Physicochemical and Engineering AspectsVolume 4405 January 2014Pages 131-135.

Hiroshi Maeda, Ken-ichi Nakamura, Hisayuki Yamane, Shigeo Sasaki, Rie Kakehashi.

Department of Chemistry, Faculty of Science, Kyushu University, 812-8581 Fukuoka, Japan and

Osaka Municipal Technical Research Institute, Morinomiya Joto-ku, 536-8553 Osaka, Japan

 

Abstract

A rapid transport of polyacrylates through aqueous dextran solutions was reported. The transported amountQ linearly increased with time t instead of t1/2. The rapid transport is associated with the formation of finger-like flows, a kind of dissipative structure. The transport rate V increased with the linear charge density of polyacrylic acid but became constant independent of the charge density if the latter exceeds a critical value. The counterion condensation was strongly suggested from this peculiar dependence on the charge density. The transport rate decreased with increasing NaCl concentration. At 0.5 M NaCl, the transport was no longer rapid but took place as a diffusion process. As another matrix–gradient system, transport of polyvinylpyrrolidone (PVP) through aqueous sodium polyacrylate solutions was also examined and rapid transport of PVP was found.

 

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