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Articles by Qiong Song
Total Records ( 2 ) for Qiong Song
  Qiong Song , Sebastian Gauza , Jie Sun , Shin Tson Wu and Xiao Liang
  Lateral difluoro terphenyls exhibit a high birefringence, fairly low viscosity and modest dielectric anisotropy, but their alignment in a vertical alignment (VA) cell often deteriorates at elevated temperatures if their concentration is high. We have studied the effects of six diluters for lowering the viscosity while stabilizing the VA of the terphenyl host mixture at elevated temperatures. The pros and cons of each diluter are analysed.
  Qiong Song , Sebastian Gauza , Haiqing Xianyu , Shin Tson Wu , Yung-Ming Liao , Chin-Yen Chang and Chain-Shu Hsu
  Four laterally difluorinated phenyl tolane liquid crystals were synthesised and their physical properties evaluated. These compounds exhibit a fairly small heat fusion enthalpy (ΔH ∼ 12.56 kJ mol-1), which is favourable for mixture formulations. For comparison, four lateral difluoro cyclohexane tolane homologues are also studied. We doped 10 wt% of each compound into a commercial negative mixture N1 and measured the birefringence, visco-elastic coefficient and figure of merit. Birefringence varies very little between homologues, but the visco-elastic coefficient increases as alkyl chain length increases. The refractive indices of these guest-host mixtures at 1550 nm are also measured.
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