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Adsorption of liquid crystals imaged using scanning tunneling microscopy

 

作者: T. J. McMaster,   H. Carr,   M. J. Miles,   P. Cairns,   V. J. Morris,  

 

期刊: Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films  (AIP Available online 1990)
卷期: Volume 8, issue 1  

页码: 672-674

 

ISSN:0734-2101

 

年代: 1990

 

DOI:10.1116/1.576370

 

出版商: American Vacuum Society

 

关键词: LIQUID CRYSTALS;ADSORPTION;SCANNING TUNNELING MICROSCOPY;SURFACE ANALYSIS;USES;MEDIUM TEMPERATURE;MOLECULAR STRUCTURE;AROMATICS;BENZENE;BILAYERS;MONOLAYERS;SMECTITE;liquid crystals

 

数据来源: AIP

 

摘要:

Scanning tunneling microscopy has been used to obtain images of the surface conformations of 4‐n‐octyl‐4’‐cyano‐biphenyl, a room‐temperature smectic liquid crystal. Working in air and using the constant‐current mode, it has been possible to resolve both the aliphatic and aromatic parts of the molecule, and to observe individual benzene rings. Two previously unreported structures have been observed: an overlapping bilayer of layer spacing 37 Å, and a densely packed monolayer of spacing 24 Å. Periodic dislocations in the molecular packing have also been observed. Surface forces and intermolecular interactions are discussed as factors which could lead to these observed structures.

 

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