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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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简乌斯圆柱体的自组装成等级性的超层结构
Andreas Walther1, Markus Drechsler, Sabine Rosenfeldt
1Makromolekulare Chemie II, Bayreuther Zentrum für Kolloide and Grenzflächen, Universität Bayreuth, D-95440 Bayreuth, Germany. andreas.walther@hut.fi
Journal of the American Chemical Society
|March 17, 2009
概括
研究人员调整了雅努斯圆柱体的大小,这些圆柱体是相分离的区块聚合物. 这些雅努斯圆柱体在不同的溶剂中自组装成纤维状聚合物和纤维状网络,表现出可调节的自组装行为.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 超分子化学 超分子化学
背景情况:
- 简斯圆柱体是两性粒子,在对立面上具有不同的化学性质.
- 块共聚合物为创建复杂纳米结构提供了一个多功能平台.
- 了解自我组装对于设计先进材料至关重要.
研究的目的:
- 为了研究詹努斯圆柱体的尺寸可调性.
- 探索Janus气在各种溶剂中的自组装行为.
- 描述由此产生的超分子结构.
主要方法:
- 通过交叉连接聚烯-块-聚丁-块-聚合物 (甲基甲酸) 聚合物来制备雅努斯瓶.
- 使用超声波处理进行尺寸调整.
- 使用RuO(4) 染色,动态光散射 (DLS),小角度中子散射 (SANS) 和冷传导电子显微镜 (Cryo-TEM) 的表征.
主要成果:
- 雅努斯的气长度可以通过超声波振幅和持续时间进行调整.
- 在良好的溶剂 (THF) 中,圆柱体存在于单分子溶解的核心-冠状结构中.
- 在选择性溶剂 (乙) 中,气形成纤维状聚合物和纤维状网络,孔径可调节.
- 聚合物表现出一个核心外结构,屏蔽不溶性聚乙烯半.
结论:
- 贾努斯圆柱体具有可控制的大小和可预测的自我组装到更高阶结构中.
- 溶剂环境决定了自我组装的途径,导致不同的形态.
- 这些发现使得能够设计具有可调节性质的新型纳米材料.
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