Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 440, 5 January 2014, Pages 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.
