PMID: 11909129Mar 23, 2002Paper

Elastic coupling of silica gel dynamics in a liquid-crystal-aerosil dispersion

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Cornelia C RetschG S Iannacchione

Abstract

The dynamics of a thixotropic silica aerosil gel dispersed in an octylcyanobiphenyl liquid crystal were directly probed by x-ray intensity fluctuation spectroscopy. For all samples, the time-autocorrelation function of the gel was well described by a modified-exponential function over the q range studied. Compared to a pure gel sample, a dilute (0.06 g cm(-3)) gel embedded within the liquid crystal displayed more complex and temperature dependent dynamics. Near the second-order smectic-A-to-nematic phase transition of the liquid crystal the gel relaxation became significantly more complex and slower (tau approximately 2150 s) compared to relaxations observed well within either phase. This clearly demonstrates coupling between the dynamics of the gel and the host liquid crystal, consistent with critical slowing down of smectic and director fluctuations. A random dampening field, elastically coupled to the liquid crystal, would explain the earlier observed crossover of this transition towards 3d-XY behavior.

References

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Jun 21, 2001·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A HourriJ Thoen
Jun 21, 2001·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M MarinelliF Mercuri
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Citations

Feb 16, 2007·Acta Crystallographica. Section A, Foundations of Crystallography·Frédéric Livet
Apr 20, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A RoshiR J Birgeneau
Mar 5, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·F CruceanuG S Iannacchione
Oct 10, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A RoshiI McNulty
Dec 31, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A RoshiM E Neubert
Apr 20, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G SinhaJ Thoen
Nov 22, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Z KutnjakS Zumer
Mar 15, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Germano S IannacchioneRobert L Leheny
Mar 15, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·P S CleggG S Iannacchione
Nov 19, 2008·The Journal of Physical Chemistry. B·C W Garland, G S Iannacchione
Feb 8, 2007·The Journal of Physical Chemistry. B·Dipti Sharma, Germano Iannacchione
Dec 22, 2006·The Journal of Physical Chemistry. B·Dipti SharmaGermano S Iannacchione

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