Gelation of smectic liquid crystal phases with photosensitive gel forming agents

Soft Matter
Pia DeindörferRudolf Zentel

Abstract

This paper studies the potential of 3 newly synthesized low molecular weight gelling agents (2 of them with azo groups) with the semicarbazide group as a H-bonding motif to gel the smectic phase of a commercial chiral smectic C material. To detect gelation two methods were used: the stabilization of the director pattern, which measures the interaction of the physical gel network with the LC-director, and the suppression of the onset of electrohydrodynamic instabilities, which measures the increase of viscosity. Special emphasis was put on the influence of the photochemical - isomerization of the gelling agents on gelation.From the stabilization of the director pattern an elastic component can be seen by the memory effect (two different switching times). Photochemical - isomerization destroys this memory effect. The increase of the threshold field for the onset of electrohydrodynamic instabilities in free-standing films measures the increase of viscosity and the supression of flow. Both methods detect the same melting temperature of the gel and the same reduction of the gelling ability upon - isomerization. This proves that the gelling abilities of the new azo-containing gelling agents can be reversibly switched on and off by ph...Continue Reading

References

Nov 5, 1990·Physical Review Letters·S W MorrisA D May
Feb 20, 2002·Chemical Reviews·Pierre Terech, Richard G. Weiss

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Citations

Nov 6, 2007·Chemical Society Reviews·Takashi KatoMasaya Moriyama
May 14, 2008·Soft Matter·Rachid MezianeRudolf Zentel
Jun 7, 2014·Chemical Communications : Chem Comm·Danielle M ZurcherAnne J McNeil
Oct 8, 2020·Soft Matter·Sonja DieterichFrank Giesselmann
Nov 5, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Xinchun YangYingying Zhao
Dec 24, 2009·The Journal of Physical Chemistry. B·Geetha G NairC V Yelamaggad
Jan 10, 2014·Chemical Reviews·Sukumaran Santhosh BabuAyyappanpillai Ajayaghosh
Oct 18, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Sonja DieterichFrank Giesselmann
Feb 4, 2016·The Journal of Physical Chemistry. B·S VimalaUma S Hiremath

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