Effect of nonionic surfactants on the kinetics of disproportion of copper sulfide nanoparticles in the aqueous sols

被引：39

作者：

Kore, RH ^{[1
]}

Kulkami, JS ^{[1
]}

Haram, SK ^{[1
]}

机构：

[1] Univ Bombay, Dept Chem, Bombay 400098, Maharashtra, India

来源：

CHEMISTRY OF MATERIALS | 2001年 / 13卷 / 05期

关键词：

D O I：

10.1021/cm010013r

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：

The effect of nonionic surfactants on the disproportion kinetics of copper sulfide nanoparticles (aqueous sols) from the golden brown, copper-rich phase (Q-Cu2S) to the green covellite phase (Q-CuS) has been presented. The transformation follows a first-order rate law. There is a substantial decrease in the rate of transformation in the presence of nonionic surfactants, viz. TX-100, NP-9.5, and NP-40. An attempt has been made to explain the phenomenon based on a surface state catalyzed transformation that is sensitive to the adsorption. The surface coverage (theta), estimated from the dependence of the rate constant on surfactant concentration, fitted the Langmuir adsorption isotherm. From these, the equilibrium constants and standard Gibbs free energy change of adsorption (Delta (ad)degreesG) have been estimated.

引用

页码：1789 / 1793

页数：5

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