Adsorption of poly(L-lysine) on silica probed by optical reflectometry

作者：Jiang Min; Popa Ionel; Maroni Plinio^*; Borkovec Michal

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2010, 360(1-3): 20-25.

DOI：10.1016/j.colsurfa.2010.01.070

• Adsorption
• Poly(L-lysine)
• Reflectometry
• Water-silica interface

Optical reflectometry was used to study adsorption behavior of poly(L-lysine) (PLL) on the water-silica interface for different pH and concentrations of the monovalent salt NaBr. At low salt level and low pH, the adsorbed amount increases with increasing salt concentration and pH This adsorption behavior can be qualitatively explained by electrostatic Interactions between the negatively charged substrate and the positively charged polyelectrolyte. At higher salt levels and pH, the adsorbed amount passes through a maximum. This maximum is probably related to the competition between adsorbing monovalent canons and the polyelectrolyte.

• 出版日期2010-5-5