Minima in Surface-tension and Interfacial-tension Curves
Minima in Surface-tension and Interfacial-tension Curves
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表面张力和界面张力曲线的最小值
DOI：
10.1021/j150440a003
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发表时间：
1945
期刊：
影响因子：
--
通讯作者：
G. D. Miles
中科院分区：
文献类型：
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作者：
G. D. Miles
在先前的一篇论文中(1)提出了证据，证明在同一溶液中至少存在两种表面活性物质时，某些表面张力-浓度曲线存在极小值。结果表明，这些成分可能是十二烷基硫酸钠和未硫酸化的十二烷基醇的混合物，也可能是十二烷基硫酸钠和痕量高分子量的同质物或类似物。在后一种情况下，假定最小值是由于主要成分十二烷基硫酸钠对高分子量同质物或类似物的痕迹的盐效应。当时，有人建议对所有表面张力最小的材料进行严格检查，可能会发现它们的“异常”行为是各种杂质或水解产物的结果，而不是单一成分的性质。本文讨论了我们以前关于含有两种或两种以上表面活性电解质的溶液的表面组成的概念所提出的实验所得的一些数据。具体地说，这项工作的目的是获得一些关于表面活性材料的两组分混合物的相对表面浓度作为体积浓度的函数的信息，这反过来可能与先前在这些相同溶液中观察到的“异常”界面张力数据有关。
In a previous paper (1) evidence was presented which established the existence of minima in certain surface-tension-concentration curves as the result of the presence of at least twosurface-active substances in the same solution. It was shown that the components could be either a mixture of sodium lauryl sulfate and unsulfated lauryl alcohol or sodium lauryl sulfate and a trace of a higher-molecular-weight· homologue or analogue. In the latter case, it was postulated that the minima were due to a salt effect of the principal constituent, sodium lauryl sulfate, upon the traces of the higher-molecular-weight homologue or analogue. At that time, it was suggested that a critical examinationof all materials which have been reported to exhibit minima in surface tension might reveal that their “anomalous” behavior was the result of various impurities or hydrolysis products rather than the property of a single component. The present paper deals with some of the data which have been obtained by means of experiments suggested by our previous concepts concerning the surface composition of solutions containing two or more surface-active electrolytes. Specifically, the object of this work has been to obtain some information con-cerning the relative surface concentration of two component mixtures of surface-active materials as a function of bulk concentrations, which in turn could be re-lated to the “anomalous” interfacial-tension data previously observed for these same solutions.