A liquid crystal like difluoroterphenyl chiral dopant was synthesized to match the dimensions of a host chiral dopant mixture. The melting point of the chiral dopants was decreased by increasing the length of the alkyl chain. The melting point of the chiral dopants also decreased when fluorine was on the same ring as the ester i.e. at 2 '', 3 '' position. These dopants were formulated with terphenyl host mixture and liquid crystal properties were assessed. New dopants, when added to the host mixture, maintain SmA(1) but the SmC2 phase was reduced markedly. There was a decrease in spontaneous polarisation when fluorine was on the same ring as the ester i.e. at 2 '', 3 '' position. As the molecular weight of the chiral dopant increased (pentyl -> heptyl -> nonyl), spontaneous polarisation decreased. (C) 2012 Elsevier B.V. All rights reserved.
Chan, L. K. M.; Gray, G. W.; Lacey, D., Molecular Crystals and Liquid Crystals (1969-1991), 1989, vol. 172, p. 125 - 146
作者:Chan, L. K. M.、Gray, G. W.、Lacey, D.、Scrowston, R. M.、Shenouda, I. G.、Toyne, K. J.
DOI:——
日期:——
Development of novel chiral dopants to be used in ferroelectric liquid crystal system
作者:Zohra N. Kayani、Robert A. Lewis、Shahzad Naseem
DOI:10.1016/j.molliq.2012.12.031
日期:2013.4
The study of chiral dopant and its application in liquid crystal system is one of the largest area of research in fluids leading to technological application in the field of display devices. Chiral dopant when mixed with achiral host mixture forms ferroelectric liquid crystal to be used in surface stabilised liquid crystal devices. 4-(pentyl, heptyl, nonyl)-2, 3 difluoro terphenyl nitriles and (S)