PM-IRRAS SPECTROSCOPY OF 9CB LIQUID-CRYSTAL THIN-FILMS DEPOSITED ON A METALLIC SUBSTRATE .1. VIBRATIONAL ANALYSIS

被引：5

作者：

BUFFETEAU, T ^{[1
]}

DESBAT, B ^{[1
]}

DEVAURE, J ^{[1
]}

SALIMI, A ^{[1
]}

TURLET, JM ^{[1
]}

机构：

[1] UNIV BORDEAUX 1,CTR PHYS MOLEC OPT & HERTZIENNE,CNRS,URA 283,F-33405 TALENCE,FRANCE

来源：

JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE | 1993年 / 90卷 / 09期

关键词：

D O I：

10.1051/jcp/1993901855

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Polarization Modulated InfraRed Reflection Absorption Spectroscopy (PM-IRRAS) has been used to obtain the vibrational spectra of 4-nonyl-4'-cyanobiphenyl (9CB) thin films deposited on a gold substrate. For the different phases of this liquid crystal, PM-IRRAS spectra of 1000 to 20 angstrom thin films exhibit important changes relative to the absorbance spectrum of a bulk sample. Just after deposition, the liquid crystal has a particular phase and it is necessary to cycle the sample at liquid nitrogen temperature to get the crystal phase. Phase transition temperatures are lower than those observed with a bulk sample. Concerning the crystalline phase, relative intensities on PM-IRRAS spectra are different from those mesured on the bulk absorbance spectrum. These differences are due to a well defined molecular orientation in the liquid crystal film.

引用

页码：1855 / 1870

页数：16

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