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(i) The geometry of the HAN cell used to measure . A dc electric field applied along the axis produces a twist distortion. Usually and . (ii) Molecular structures and phase sequences exhibited by (a) 1,3-phenylene bis[4-(3-methylbenzoyloxy)] -dodecylbiphenyl -carboxylate (BC12) and (b) -octyloxy -cyanobiphenyl (8OCB). Temperatures are in .
Variations of flexo-elastic ratio of pure 8OCB, 5 M and 8M mixtures with shifted temperature. In 8M the tilt angle is estimated to be . The transition occurs at , and for 8OCB, 5M and 8M, respectively.
Variations of tilt angles at the two surfaces as functions of . The physical parameters used in the calculations are shown in the insets.
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