Correlation Between Bulk Orderings and Anchoring Structures of Liquid Crystals Studied by Scanning Tunneling Microscopy
- 1 October 1991
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 30 (10R), 2542-2546
- https://doi.org/10.1143/jjap.30.2542
Abstract
The anchoring structures of a homologous series of liquid crystals, n-alkylcyanobiphenyls (mCBs: m=7-12), on molybdenum disulfide (MoS2) are directly observed by scanning tunneling microscopy (STM) in order to analyze the alignment mechanism of liquid crystals. Based on highly reproducible STM images, the anchoring structures of mCBs are clearly divided into two categories, a monolayer (single-row) type (7CB, 8CB, 9CB and 11CB) and a bilayer (double-row) type (10CB and 12CB). Here we propose the monolayer is the anchoring structure of a nematic phase, while the bilayer is the anchoring structure of a smectic phase. The correlation between bulk phase orderings and anchoring structures of liquid crystals is discussed from the viewpoint of surface-phase formation for the mCBs and different solid substrates.Keywords
This publication has 12 references indexed in Scilit:
- Two Types of Anchoring Structure in Smectic Liquid Crystal MoleculesJapanese Journal of Applied Physics, 1990
- Surface phasesNature, 1990
- Structure, registry and imaging mechanism of alkylcyanobiphenyl molecules by tunnelling microscopyNature, 1990
- Anchoring structure of smectic liquid-crystal layers on MoS2 observed by scanning tunnelling microscopyNature, 1990
- Observation of Liquid Crystals on Graphite by Scanning Tunneling MicroscopyJapanese Journal of Applied Physics, 1990
- Smectic Liquid Crystal Monolayers on Graphite Observed by Scanning Tunneling MicroscopyScience, 1989
- Contrast mechanism for resolving organic molecules with tunnelling microscopyNature, 1989
- Imaging of liquid crystals using a tunnelling microscopeNature, 1988
- The structure of smectic A phases of compounds with cyano end groupsJournal de Physique, 1979
- Selective adsorption at graphite/hydrocarbon interfacesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1970