PMID: 15244597Jul 13, 2004Paper

First-order isotropic-smectic-A transition in liquid-crystal-aerosil gels

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
M K RamazanogluJ M Kim

Abstract

The short-range order which remains when the isotropic to smectic- A transition is perturbed by a gel of silica nanoparticles (aerosils) has been studied using high-resolution synchrotron x-ray diffraction. The gels have been created in situ in decylcyanobiphenyl, which has a strongly first-order isotropic to smectic- A transition. The effects are determined by detailed analysis of the temperature and gel density dependence of the smectic structure factor. In previous studies of the continuous nematic to smectic- A transition in a variety of thermotropic liquid crystals the aerosil gel appeared to pin, at random, the phase of the smectic density modulation. For the isotropic to smectic- A transition the same gel perturbation yields different results. The smectic correlation length decreases more slowly with increasing random-field variance in good quantitative agreement with the effect of a random pinning field at a transition from a uniform phase directly to a phase with one-dimensional translational order. We thus compare the influence of random fields on a freezing transition with and without an intervening orientationally ordered phase.

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Citations

Nov 9, 2010·The Journal of Chemical Physics·Krishna P Sigdel, Germano S Iannacchione
Feb 24, 2015·Soft Matter·Anne C Pawsey, Paul S Clegg
Dec 31, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G SinhaJ Thoen
Oct 3, 2019·Physical Review. E·Mehmet RamazanogluRumeysa Salcı
Jun 4, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M RamazanogluR J Birgeneau
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Gilbert ChahinePatrick Huber
Aug 11, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J LeysJ Thoen
Feb 26, 2009·The Journal of Physical Chemistry. B·Kamendra P SharmaOlivier Mondain-Monval

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