Dynamic surface tension, critical micelle concentration, and activity coefficients of aqueous solutions of nonyl phenol ethoxylates

被引：45

作者：

Calvo, Encina ^{[1
]}

Bravo, Ramon ^{[1
]}

Amigo, Alfredo ^{[1
]}

Gracia-Fadrique, Jesus ^{[2
]}

机构：

[1] Univ Santiago de Compostela, Dept Fis Aplicada, Fac Fis, E-15782 Santiago De Compostela, Spain

[2] Univ Nacl Autonoma Mexico, Fac Quim, Dept Fisicoquim, Mexico City 04510, DF, Mexico

来源：

FLUID PHASE EQUILIBRIA | 2009年 / 282卷 / 01期

关键词：

Surface tension; Diffusion coefficient; Critical micelle concentration; Activity coefficient at infinite dilution; Nonyl phenol ethoxylate; Aqueous solution; INFINITE DILUTION; ADSORPTION; NONYLPHENOL; BEHAVIOR; WATER; ENVIRONMENT; INTERFACE; MIXTURES; TOXICITY; SULFATE;

D O I：

10.1016/j.fluid.2009.04.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Dynamic surface tensions, sigma(t) for aqueous solutions of nonyl phenol ethoxylates (NPEOs) at the temperature 298.15 K were measured using a Lauda drop volume tensiometer. The non-ionic surfactants analyzed in this work were Tergitol NP-9, NP-35 and NP-40. By using the classical Ward and Torday equation, the diffusion coefficient for each bulk surfactant concentration was calculated. The equilibrium surface tension values were determined by extrapolating the dynamic surface tension to t -> infinity on the sigma(t) vs. t-(1/2) curves. These values were used to determine the critical micelle concentrations (CMC) of the surfactant aqueous solutions as well as to calculate the infinite dilution activity coefficient of the surfactant, following a model that combines the Volmer surface equation of state and the Gibbs adsorption equation. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：14 / 19

页数：6

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