Unique Temperature-Dependent Supramolecular Self-Assembly: From Hierarchical 1D Nanostructures to Super Hydrogel

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• 作者：Yan Qiao ; Yiyang Lin ; Zhiyi Yang ; Huanfa Chen ; Shaofei Zhang ; Yun Yan ; Jianbin Huang
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：September 16, 2010
• 年：2010
• 卷：114
• 期：36
• 页码：11725-11730
• 全文大小：451K
• 年卷期：v.114,no.36(September 16, 2010)
• ISSN：1520-5207

文摘

Supramolecular self-assembly can not only lead to a better understanding of biological systems, but also can enable rational building of complex and functional materials. In this report, hierarchical one-dimensional (1D) architectures involving nanotubes, coiled-coil ropelike structures, nanohelices, and nanoribbons are created via lanthanum−cholate supramolecular self-assembly. These sophisticated self-assemblies are proven to be mediated by temperature. The entanglement of one-dimensional nanostructures is demonstrated to give rise to fascinating “super” hydrogel, which can realize water gelation at extremely low concentration. Unprecedented water gelation behaviors, that is, heating-enhanced stiffness and heating-promoted gelation, are found in lanthanum−cholate supramolecular hydrogel. The driving forces of self-assembled complex nanostructures and the unique role of temperature are also discussed.