Orientational ordering in 2,6-lutidine near quartz surfaces modified by carbonстатья
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Дата последнего поиска статьи во внешних источниках: 24 октября 2013 г.
Аннотация:In this paper we present experimental results for the optical dichroism of ultra-thin layers of an epitropic liquid crystal, 2,6-lutidine, on a carbonized quartz substrate. The carbon layer consists of carbon chains with an orientation perpendicular to the substrate surface. It significantly enhances the orientational order of the lutidine layers adjacent to the surface. A two-fold increase of the orientational order parameter S for 2,6-lutidine (from 0.22 to 0.45) has been measured due to the influence of the carbon layer. The inclusion of nitrogen atoms (nN = 7%) into the carbon film leads to a further increase of S from 0.45 to 0.65.