Surface tension of general electrolyte solutions
Surface tension of general electrolyte solutions
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DOI：
10.1007/s00396-004-1114-3
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发表时间：
2004-04
影响因子：
2.4
通讯作者：
H. Ohshima
中科院分区：
文献类型：
--
作者：
H. Ohshima
推导了包括对称和不对称电解质的一般电解质溶液的表面张力的简单解析表达式。遵循 Levin 和 Flores-Mena 的理论（Europhys Lett (2001) 56:187），我们在空气/电解质溶液界面处的吉布斯分界面下方引入了厚度为 δ 的无离子层。我们使用线性化泊松-玻尔兹曼方程来计算电解质溶液中离子周围的平均电势和局部波动电势，并使用拉普拉斯方程来计算无离子层中的这些电势。研究发现，对于低电势，平均电势以及沿界面的切向麦克斯韦应力的贡献消失。 Matubayasi 等人 (J Colloid Interf Sci (1999) 209:398，同上 (1999) 209:403，同上 (2001) 243:444) 的实验数据用本理论进行分析，以估计几种电解质的 δ 值。
A simple analytic expression is derived for the surface tension of a solution of general electrolytes including symmetrical and unsymmetrical electrolytes. Following the theory of Levin and Flores-Mena (Europhys Lett (2001) 56:187), we have introduced an ion-free layer of thicknessδjust below the Gibbs dividing surface at the air/electrolyte solution interface. We use the linearized Poisson-Boltzmann equations for the mean potential and for the local fluctuation potential around an ion in the electrolyte solution, together with the Laplace equation for these potentials in the ion-free layer. It is found that the contribution of the mean potential as well as the tangential Maxwell stress along the interface vanishes for low potentials. Experimental data by Matubayasi et al (J Colloid Interf Sci (1999) 209:398, ibid (1999) 209:403, ibid (2001) 243:444) are analyzed with the present theory in order to estimate the values ofδfor several electrolytes.