Czajka Adam, Hazell Gavin, Eastoe Julian
School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom.
Langmuir. 2015 Aug 4;31(30):8205-17. doi: 10.1021/acs.langmuir.5b00336. Epub 2015 Apr 5.
This article analyzes how the individual structural elements of surfactant molecules affect surface properties, in particular, the point of reference defined by the limiting surface tension at the aqueous cmc, γcmc. Particular emphasis is given to how the chemical nature and structure of the hydrophobic tails influence γcmc. By comparing the three different classes of surfactants, fluorocarbon, silicone, and hydrocarbon, a generalized surface packing index is introduced which is independent of the chemical nature of the surfactants. This parameter ϕcmc represents the volume fraction of surfactant chain fragments in a surface film at the aqueous cmc. It is shown that ϕcmc is a useful index for understanding the limiting surface tension of surfactants and can be useful for designing new superefficient surfactants.
本文分析了表面活性剂分子的各个结构元素如何影响表面性质，特别是由水相临界胶束浓度（cmc）下的极限表面张力γcmc所定义的参考点。特别强调了疏水尾链的化学性质和结构如何影响γcmc。通过比较碳氟化合物、硅氧烷和碳氢化合物这三类不同的表面活性剂，引入了一个与表面活性剂化学性质无关的广义表面堆积指数。该参数ϕcmc表示在水相cmc时表面膜中表面活性剂链片段的体积分数。结果表明，ϕcmc是理解表面活性剂极限表面张力的一个有用指标，并且可用于设计新型超高效表面活性剂。
