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

被引：40
|
作者：
Jiang, Min [1 ]
Popa, Ionel [1 ]
Maroni, Plinio [1 ]
Borkovec, Michal [1 ]
机构：
[1] Univ Geneva, Dept Inorgan Analyt & Appl Chem, CH-1205 Geneva, Switzerland
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2010年 / 360卷 / 1-3期
基金：
瑞士国家科学基金会;
关键词：
Adsorption; Poly(L-lysine); Reflectometry; Water-silica interface; POLY-L-LYSINE; DYNAMIC LIGHT-SCATTERING; POLY(PROPYLENE IMINE) DENDRIMERS; HELIX-COIL TRANSITION; POLYELECTROLYTE ADSORPTION; AQUEOUS-SOLUTIONS; PARTICLE DEPOSITION; COLLOIDAL SILICA; LATEX-PARTICLES; OXIDE SURFACES;
D O I：
10.1016/j.colsurfa.2010.01.070
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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. The initial adsorption kinetics is mainly controlled by the mass transport to the surface (C) 2010 Elsevier B.V. All rights reserved
引用
收藏
页码：20 / 25
页数：6
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