Effect of pressure on the stability of smectic C phases

Abstract

We have carried out pressure studies on three pure compounds, viz., di-(4'-n -octyloxyphenyl)-trans-cyclohexane-1, 4-dicarboxylate), p-n-nonyloxybenzoic acid and n-pentyl-4 (4'-n-decyloxybenzylideneamino) cinnamate, each of which exhibits the smectic C phase but the nature of the temperature variation of the tilt angle being different in the three cases. It is found that for all the compounds the smectic C phase is suppressed at high pressures.