Self-Assembly of Nonionic Surfactant Tween 20@2尾-CD Inclusion Complexes in Dilute Solution

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• 作者：Chengcheng Zhou ; Xinhao Cheng ; Qiang Zhao ; Yun Yan ; Jide Wang ; Jianbin Huang
• 刊名：Langmuir
• 出版年：2013
• 出版时间：October 29, 2013
• 年：2013
• 卷：29
• 期：43
• 页码：13175-13182
• 全文大小：448K
• 年卷期：v.29,no.43(October 29, 2013)
• ISSN：1520-5827

文摘

It has long been considered that the addition of cyclodextrins (CDs) disfavors the self-assembly of surfactants in dilute solutions since the hydrophobic effect is destroyed upon the formation of the hydrophiphilic CD/surfactant inclusion complex. However, in this work, we found that 尾-CD/nonionic surfactant inclusion complexes are able to self-assemble into vesicles in dilute solutions, namely in solutions with concentration lower than the CMC of surfactants. When using Tween 20 as a model surfactant, HNMR and MS measurements indicate that the building block for the vesicles is the channel type Tween 20@2尾-CD inclusion complex. Structure and IR analysis suggests that the self-assembly of hydrophilic Tween 20@2尾-CD is driven by H-bonds between both the headgroup of Tween 20 and the hydroxyl groups of 尾-CD. The self-assembly of the inclusion complex between the 尾-CD and the nonionic surfactant in dilute solution is found to be a general phenomenon. Undoubtedly, surfactant@2尾-CD inclusion complex can be a novel building block for nonamphiphilic self-assembly, which provides a new physical insight for the influence of cyclodextrins on the self-assembly of surfactants.