Monolayers of cationic polyelectrolytes on mica - Electrokinetic studies
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- 作者：Maria Morga ; Zbigniew Adamczyk
- 关键词：Electrokinetic characteristics of polyelectrolytes ; Electrokinetics of particle covered surfaces ; adsorption of polyelectrolytes on mica ; PAH ; PEI ; PDDA adsorption on mica ; Streaming potential measurements ; Zeta potential of heterogeneous surfaces ; The de
- 刊名：Journal of Colloid and Interface Science
- 出版年：2013
- 出版时间：1 October, 2013
- 年：2013
- 卷：407
- 期：Complete
- 页码：196-204
- 全文大小：1356 K
文摘
Physicochemical properties of cationic polyelectrolytes: poly(allylamine hydrochloride) (PAH), poly(ethylene imine) (PEI), and poly(dimethyldiallylammonium chloride) (PDDA), having molar mass of 70,000, 75,000, and 120,000, respectively, were examined and compared. The bulk characteristics comprised the diffusion coefficient and electrophoretic mobility determined as a function of pH (3.5-9) and ionic strengths (10?4 M to 0.15 M NaCl). These measurements allowed one to determine the amount of electrokinetic charge of the polyelectrolyte molecules and their isoelectric points. On the other hand, formation of polyelectrolyte monolayers on mica and their properties were investigated using the in situ streaming potential method. Additionally, using this method, the stability of monolayers, evaluated via desorption kinetic measurements, was determined. The investigations showed that PAH molecules form the most stable monolayers, which can be used as supporting layers for particle deposition and multilayer formation.