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閱讀：240 發布時間：2016-8-29文獻名： Superstructure Formation and Topological Evolution Achieved by Self-Organization of a Highly Adaptive Dynamer
作者： Pengyao Xing†, Hongzhong Chen‡, Linyi Bai‡, Aiyou Hao†, and Yanli Zhao‡§
† Key Laboratory of Colloid and Interface Chemistry of Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People’s Republic of China
‡ Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
§ School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
摘要：The adaptive property of supramolecular building blocks facilitates noncovalent synthesis of soft materials. While it is still a challenging task, fine-tuning and precise control over topological nanostructures constructed from the self-assembly of low-molecular-weight building blocks are an important research direction to investigate the structure–property relationship. Herein, we report controlled self-assembly evolution of a low-molecular-weight building block bearing cholesterol and naphthalene-dicarboximide moieties, showing ultrasensitivity to solvent polarity. In low-polarity solvents (<4), it could form an M-type fiber-constituted organogel (supergel) with high solvent content, columnar molecular packing, and self-healing property. Highly polar solvents (>7.8) favor the formation of P-type helical nanostructures terminated by nanotoroids, having lamellar molecular packing. With a further increase in solvent polarity (up to 9.6), unilamellar and multilamellar vesicles were generated, which could undergo an aggregation-induced fusion process to form branched nanotubes tuned by the concentration. Self-attractive interactions between aggregates were found to be responsible for the formation of superstructures including helix–nanotoroid junctions as well as membrane-fused nanotubes.
關鍵詞：adaptive dynamer; morphological evolution; self-assembly; superstructures; vesicles