Influence of Crown Ethers and Macrocyclic Kryptands upon the Percolation Phenomena in AOT/Isooctane/H2O Microemulsions
Influence of Crown Ethers and Macrocyclic Kryptands upon the Percolation Phenomena in AOT/Isooctane/H2O Microemulsions
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DOI：
10.1021/la970297n
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发表时间：
1997-11
期刊：
影响因子：
3.9
通讯作者：
L. García‐Río;P. Hervés;J. Leis;J. Mejuto
中科院分区：
文献类型：
--
作者：
L. García‐Río;P. Hervés;J. Leis;J. Mejuto
研究了几种添加剂对 AOT/异辛烷/水体系性能的影响。冠醚（18-crown-6）和氪配合物（氪222、氪221和氪211）的存在对电渗流现象具有重要影响。低大环浓度阻碍电渗滤现象。这种效应似乎是由于大环化合物络合离子并将其转移到界面的能力。中和高大环浓度有利于电渗透，这种效应与其与 AOT 头基的界面关联有关。观察到的行为已根据临界堆积参数进行了解释，并将其与电解质或小有机分子等小添加剂的影响进行了比较。
The influence of several additives upon the properties of the system AOT/isooctane/water has been investigated. The presence of crown ethers (18-crown-6) and kryptand complexes (kryptand 222, kryptand 221 and kryptand 211) have an important effect upon the electrical percolation phenomena. Low macrocyclic concentrations hinder the electrical percolation phenomenon. This effect seems to be due to the ability of macrocycles to complex ions and transfer them to the interface. Medium and high macrocyclic concentrations favor the electrical percolation, and this effect is related to their interfacial association to the AOT head groups. The observed behavior has been explained in terms of critical packing parameter, and it is compared with the influence of small additives as electrolytes or small organic molecules.