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Bent-Core Liquid Crystals
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In recent years bent-core (BC)§liquid crystals have begun to mature into a relevant§subfield of§research. The shape and symmetry of BC molecules §offers a§wealth of new questions not presented by calamitic§liquid crystals,§many of which have yet to be addressed. In this work,§I use magnetic§field induced birefringence, dynamic light§scattering, and density§measurements to provide evidence of a transition§between two optically§isotropic phases in two BC liquid crystals, and to§show that this transition can be understood in§the framework of the theoretically predicted, but§previously§unobserved tetrahedratic - isotropic transition. §Also, four distinct, frequency dependent, regions of§electrohydrodynamic convection (EHC) were§characterized in a BC liquid crystal, which showed§two frequency dependent changes in the§sign of the electrical conductivity anisotropy. This§work looks into some exciting behaviors in novel BC§liquid crystal materials and should be of interest§those involved with EHC or BC liquid crystals.
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