Toroidal triblock copolymer assemblies

被引：699

作者：

Pochan, DJ ^{[1
]}

Chen, ZY

Cui, HG

Hales, K

Qi, K

Wooley, KL

机构：

[1] Univ Delaware, Delaware Biotechnol Inst, Newark, DE 19716 USA

[2] Washington Univ, Ctr Mat Innovat, St Louis, MO 63130 USA

[3] Washington Univ, Dept Chem, St Louis, MO 63130 USA

来源：

SCIENCE | 2004年 / 306卷 / 5693期

关键词：

D O I：

10.1126/science.1102866

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A stable phase of toroidal, or ringlike, supramolecular assemblies was formed by combining dilute solution characteristics critical for both bundling of like-charged biopolymers and block copolymer micelle formation. The key to toroid versus classic cylinder micelle formation is the interaction of the negatively charged hydrophilic block of an amphiphilic triblock copolymer with a positively charged divalent organic counterion. This produces a self-attraction of cylindrical micelles that leads to toroid formation, a mechanism akin to the toroidal bundling of semiflexible charged biopolymers such as DNA. The toroids can be kinetically trapped or chemically cross-linked. insight into the mechanism of toroid formation can be gained by observation of intermediate structures kinetically trapped during film casting.

引用

页码：94 / 97

页数：4

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