PMID: 15244593Jul 13, 2004Paper

Evidence for different polymorphisms with and without an external electric field in a series of bent-shaped molecules

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
J Ph BedelM F Achard

Abstract

Five fluid tilted mesophases are observed in a series of achiral banana-shaped compounds. The terminal chain length is the pertinent molecular parameter which induces the polymorphism change. All the phases, refer to tilted lamellar structure without in-plane order in the layers. The observation of monolayer, bilayer, ribbon phase, and undulated structures recalls the richness of the polymorphism of the frustrated polar calamitic liquid crystals. Among the mesophases, we highlight two: a Sm-C G2 phase corresponding to a bilayer structure made of Sm-CG layers, and its two-dimensional variant, Sm- Ctilde; G2. The five mesophases observed at zero field are switchable under electric field. At least three ferroelectric phases are induced by an applied field. There is no direct correspondence between the zero field phases and the phases observed under electric field. These observations show that different polymorphisms exist in the series with and without an applied field. A unique ( E,T ) phase diagram is presented, corresponding to the superposition of the ( E,T ) diagrams obtained for each homolog of the series, where the influence of the chain length is equivalent to a shift on the temperature axis.

References

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Citations

Oct 19, 2005·The European Physical Journal. E, Soft Matter·A Roy, N V Madhusudana
Aug 8, 2007·The European Physical Journal. E, Soft Matter·J P MarcerouT Soltani
Apr 22, 2008·The European Physical Journal. E, Soft Matter·S Findeisen-TandelA Eremin
Sep 16, 2006·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Wolfgang WeissflogGerhard Pelzl
Aug 13, 2013·Angewandte Chemie·Carsten Tschierske
Mar 17, 2012·Beilstein Journal of Organic Chemistry·Sonja Findeisen-TandelChannabasaveshwar V Yelamaggad
Apr 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Nattaporn ChatthamAlexey Eremin
May 21, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Alexey EreminWolfgang Weissflog
Apr 7, 2010·Physical Review Letters·Nattaporn ChatthamNoel A Clark
Sep 28, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J P Marcerou
Aug 30, 2011·Journal of the American Chemical Society·Wei-Hong ChenHong-Cheu Lin
Nov 4, 2004·Journal of the American Chemical Society·Christina KeithCarsten Tschierske

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