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Design of Siloxane Liquid Crystals Forming a De Vries SmA* Phase

Abstract : We designed and synthesized new SmA* liquid crystals with different molecular architectures based on the chiral mesogen MR11, which was unsubstituted, or attached at one end and at both ends of a trisiloxane segment in the monosubstituted MSi3-MR11 and disubstituted DSi3-MR11 siloxanes, respectively. We studied the critical divergence of the magnetic susceptibility by measurements of the induced tilt angle Θind at the SmA*–SmC* transition. While all three SmA* liquid crystals presented a de Vries character, this was quite distinctive for DSi3-MR11 for which the critical exponent γ = 1.87 was maximal. X-ray diffraction experiments confirmed that the SmA*–SmC* transition occurred with essentially no layer shrinkage.
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Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Thursday, March 2, 2006 - 4:54:17 PM
Last modification on : Friday, August 5, 2022 - 10:41:05 AM




G. Galli, M. Reihmann, A. Crudeli, E. Chiellini, Yu. Panarin, et al.. Design of Siloxane Liquid Crystals Forming a De Vries SmA* Phase. Molecular Crystals and Liquid Crystals, Taylor & Francis, 2005, 439 (1), pp.245/[2111]-257/[2123]. ⟨10.1080/15421400590958089⟩. ⟨in2p3-00025729⟩



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