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Molecular Crystals and Liquid Crystals 439 (2005) 245/(2111)-257/(2123)
Design of Siloxane Liquid Crystals Forming a De Vries SmA* Phase
G. Galli, M. Reihmann, A. Crudeli, E. Chiellini, Yu. Panarin, J. Vij, C. Blanc1, V. Lorman1, N. Olsson

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.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Physique/Physique/Agrégats Moléculaires et Atomiques
de Vries smectic – electrooptics – molecular design – siloxane liquid crystal