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Asymmetric Fullerene Nanosurfactant: Interface Engineering for Automatic Molecular Alignments
Small ( IF 13.0 ) Pub Date : 2017-11-14 , DOI: 10.1002/smll.201702439
Dae-Yoon Kim 1 , Sang-A Lee 1 , Soeun Kim 1 , Changwoon Nah 1 , Seung Hee Lee 2 , Kwang-Un Jeong 1
Affiliation  

Since the molecular self‐assembly of nanomaterials is sensitive to their surface properties, the molecular packing structure on the surface is essential to build the desired chemical and physical properties of nanomaterials. Here, a new nanosurfactant is proposed for the automatic construction of macroscopic surface alignment layer for liquid crystal (LC) molecules. An asymmetric nanosurfactant (C60NS) consisted of mesogenic cyanobiphenyl moieties with flexible alkyl chains and a [60]fullerene nanoatom is newly designed and precisely synthesized. The C60NS directly introduced in the anisotropic LC medium is self‐assembled into the monolayered protrusions on the surface because of its amphiphilic nature originated by asymmetrically programmed structural motif of LC‐favoring moieties and LC‐repelling groups. The monolayered protrusions constructed by the phase‐separation and self‐assembly of asymmetric C60NS nanosurfactant in the anisotropic LC media amplify and transfer the molecular orientational order from surface to bulk, and finally create the automatic vertical molecular alignment on the macroscopic length scale. The asymmetric C60NS nanosurfactant and its self‐assembly described herein can offer the direct guideline of interface engineering for the automatic molecular alignments.

中文翻译:

不对称富勒烯纳米表面活性剂:用于自动分子比对的界面工程

由于纳米材料的分子自组装对其表面性质敏感,因此表面上的分子堆积结构对于建立所需的纳米材料化学和物理性质至关重要。在这里,提出了一种新的纳米表面活性剂,用于液晶分子的宏观表面取向层的自动构建。一种新的不对称纳米表面活性剂(C 60 NS)由介晶的具有柔性烷基链的氰基联苯部分和[60]富勒烯纳米原子组成,并进行了精确合成。C 60直接引入各向异性LC介质中的NS由于其两亲性质是由LC有利基团和LC排斥基团的不对称编程结构基序引发的,因此会自组装成表面上的单层突起。由各向异性LC介质中不对称C 60 NS纳米表面活性剂的相分离和自组装构造的单层突出物,放大并转移了分子从表面到本体的取向顺序,并最终在宏观长度尺度上实现了自动垂直分子排列。本文所述的不对称C 60 NS纳米表面活性剂及其自组装可为自动分子比对提供界面工程的直接指导。
更新日期:2017-11-14
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