Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement.
Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement.
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DOI：
10.1126/sciadv.1602102
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发表时间：
2017-02
期刊：
影响因子：
13.6
通讯作者：
Yoon DK
中科院分区：
文献类型：
--
作者：
Kim H;Ryu SH;Tuchband M;Shin TJ;Korblova E;Walba DM;Clark NA;Yoon DK
通过在纳米约束下与螺旋纳米丝的相互作用，可以实现完全对准的液晶相。可以以在阳极氧化铝（AAO）膜的每个圆柱形纳米孔中产生单个手性螺旋纳米丝的方式生长某些双核介晶分子的层状液晶（LC）相。通过将客体分子引入到所得复合手性纳米通道中，我们探索了有序客体/主体LC复合物的结构和功能，验证了通过LC组织和纳米多孔AAO超结构的组合获得的流体CNOLC相的近晶状位置顺序。客体液晶4′-正戊基-4-氰基联苯与主体1，3-亚苯基双[4-（4-壬氧基苯基亚氨基甲基）苯甲酸酯]在纳米丝/客体界面处形成独特的流体层状有序液晶复合物，该界面与AAO柱壁接触。纤维的生长形式受混合物参数和孔隙尺寸的强烈影响。
A perfectly aligned liquid crystal phase can be achieved by an interaction with helical nanofilament under nanoconfinement. A lamellar liquid crystal (LC) phase of certain bent-core mesogenic molecules can be grown in a manner that generates a single chiral helical nanofilament in each of the cylindrical nanopores of an anodic aluminum oxide (AAO) membrane. By introducing guest molecules into the resulting composite chiral nanochannels, we explore the structures and functionality of the ordered guest/host LC complex, verifying the smectic-like positional order of the fluidic nematic LC phase, which is obtained by the combination of the LC organization and the nanoporous AAO superstructure. The guest nematic LC 4′-n-pentyl-4-cyanobiphenyl is found to form a distinctive fluid layered ordered LC complex at the nanofilament/guest interface with the host 1,3-phenylene bis[4-(4-nonyloxyphenyliminomethyl)benzoate], where this interface contacts the AAO cylinder wall. Filament growth form is strongly influenced by mixture parameters and pore dimensions.