The trapezoidal cylinder phase: a new mode of self-assembly in liquid-crystalline soft matter.
The trapezoidal cylinder phase: a new mode of self-assembly in liquid-crystalline soft matter.
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DOI：
10.1021/ja8038932
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发表时间：
2007-07
影响因子：
15
通讯作者：
Feng Liu;Bin Chen;Benjamin Glettner;M. Prehm;M. K. Das;U. Baumeister;X. Zeng;G. Ungar;C. Tschierske
中科院分区：
文献类型：
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作者：
Feng Liu;Bin Chen;Benjamin Glettner;M. Prehm;M. K. Das;U. Baumeister;X. Zeng;G. Ungar;C. Tschierske
报道了一种新的具有P2GG晶格的矩形柱状液晶相，它代表了由梯形截面的柱面组成的多边形柱面阵列。在这些多边形圆柱体中，其中一条边的长度不同，并且由与其他边不同的材料组成。这种平铺图案是在两个系列的T型面部两亲性三嵌段分子中获得的，其中刚性棒状对三苯基被极性和柔性的寡乙二醇链横向取代，末端由氢键COOH或Li羧基终止，并且末端具有相同或不同的烷基。梯形柱体相在较低的温度下为相对较长和刚性的烷基链提供了改进的填充，并且多边形柱体内比三角形柱体有更多的空间。这种构象和空间填充效应的组合导致了不同的相序。梯形圆柱体相为LC工程的新的复杂性铺平了道路，并展示了多亲技术的一般概念在设计新的复杂软物质结构方面的巨大潜力。
A new rectangular columnar liquid crystalline phase with p2gg lattice is reported, which represents a polygonal cylinder array composed of cylinders with trapezoidal cross section. In these polygonal cylinders, one of the sides has a different length and is composed of a different material than the others. This tiling pattern was obtained in two series of T-shaped facial amphiphilic triblock molecules in which a rigid rod-like p-terphenyl core is substituted laterally by a polar and flexible oligoethylene glycol chain, terminated either by a hydrogen-bonding COOH group or by a Li carboxylate group, and having identical or different alkyl groups in the terminal positions. The trapezoidal cylinder phase provides an improved packing for relatively long and rigid alkyl chains at lower temperature and more space inside the polygonal cylinders than triangular cylinders. This combination of conformational and space-filling effects leads to different phase sequences. The trapezoidal cylinder phases pave the way to a new level of complexity in LC engineering and show the huge potential of the general concept of polyphilic tectons for the design of new complex soft matter structures.