Proximal adsorption at glass surfaces: Ionic strength, pH, chain length effects

被引：33

作者：

Lokar, WJ ^{[1
]}

Ducker, WA ^{[1
]}

机构：

[1] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA

来源：

LANGMUIR | 2004年 / 20卷 / 02期

关键词：

D O I：

10.1021/la035288v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The adsorption and desorption of pyridinium chloride surfactants on borosilicate glass are studied as a function of the separation between two glass-solution interfaces. Both the adsorption and desorption change exponentially with the separation; the decay is equal to the solution Debye length. Changes in adsorption are smaller at pH 1.8 (near the point of zero charge of glass) than at pH 6. These results are consistent with an electrostatic cause for the changes in adsorption. The magnitude of the adsorption regulation, however, depends on the length of the alkyl chain and the surface excess of the surfactant. Therefore, proximal adsorption in this system depends on the coupling between the long-range electrostatic forces and the short-range chain-chain interactions. The equation of state for the surfactant on a regulating surface is discussed with respect to changes in intersurface separation.

引用

页码：378 / 388

页数：11

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