Bent-core mesogens are attracting great attention because of their potentially biaxial and polar nematic phase. In this paper, we review the results of our recent X-ray diffraction studies on the nematic phase of oxadiazole-based mesogens. The evolution of the smallangle diffraction signal with temperature points to the existence of nano-sized cybotactic clusters, characterized by short-range smectic-like fluctuations. However, in contrast to classical cybotaxis of calamitic nematics, these fluctuations do not have a pretransitional nature. They explain most of the extraordinary properties of bent-core mesogens and, in particular, are responsible for the unique ferroelectric response exhibited by one of our compounds.

Recent Developments in Nematogenic Bent-Core Mesogens: an X-ray Diffraction Perspective / Vita, Francesco; Placentino, IMMACOLATA FAUSTA; Francescangeli, Oriano. - In: JOURNAL OF NONLINEAR OPTICAL PHYSICS AND MATERIALS. - ISSN 0218-8635. - STAMPA. - 20:4(2011), pp. 485-499. [10.1142/S0218863511006285]

Recent Developments in Nematogenic Bent-Core Mesogens: an X-ray Diffraction Perspective

VITA, Francesco;PLACENTINO, IMMACOLATA FAUSTA;FRANCESCANGELI, ORIANO
2011-01-01

Abstract

Bent-core mesogens are attracting great attention because of their potentially biaxial and polar nematic phase. In this paper, we review the results of our recent X-ray diffraction studies on the nematic phase of oxadiazole-based mesogens. The evolution of the smallangle diffraction signal with temperature points to the existence of nano-sized cybotactic clusters, characterized by short-range smectic-like fluctuations. However, in contrast to classical cybotaxis of calamitic nematics, these fluctuations do not have a pretransitional nature. They explain most of the extraordinary properties of bent-core mesogens and, in particular, are responsible for the unique ferroelectric response exhibited by one of our compounds.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/87433
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