材料科学
结晶
纹理(宇宙学)
纳米尺度
相(物质)
薄膜
化学物理
透射电子显微镜
结晶学
扫描透射电子显微镜
液晶
纳米技术
相变
平面的
化学工程
光电子学
凝聚态物理
化学
有机化学
物理
计算机图形学(图像)
人工智能
计算机科学
工程类
图像(数学)
作者
Shuoyuan Huang,Shinian Cheng,Jianzhu Ju,Debaditya Chatterjee,Junguang Yu,Harald Böck,Lian Yu,M. D. Ediger,Paul M. Voyles
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-10-04
卷期号:18 (41): 28095-28103
标识
DOI:10.1021/acsnano.4c07507
摘要
Highly ordered liquid crystalline (LC) phases have important potential for organic electronics. We studied the molecular alignment and domain structure in a columnar LC thin film with nanometer resolution during in situ heating using four-dimensional scanning transmission electron microscopy (4D STEM). The initial disordered vapor-deposited LC glass thin film rapidly ordered at its glass transition temperature into a hexagonal columnar phase with small (<10 nm), well-aligned, planar domains (columns oriented parallel to the surface). Upon further heating, the domains coarsen via bulk diffusion, then the film crystallizes, then finally transforms back to an LC phase at an even higher temperature. The LC phase at high temperature shows straight columns of molecules, which we attribute to structure inherited from the intermediate crystalline phase. Nanoscale 4D STEM offers direct insight into the mechanisms of domain reorganization, and intermediate crystallization is a potential approach to manipulate orientational order and texture at the nano- to mesoscale in LC thin films.
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