笼形倍半硅氧烷修饰的金纳米粒子对4-正戊基4'-氰基联苯液晶性能的影响

为有效降低液晶器件的开启电压,获得具有低功耗特性的液晶显示器件。本文采用巯基功能化的笼形倍半硅氧烷(POSS)作为修饰配体,硼氢化钠为还原剂,采用一步法还原氯金酸制备出粒径约为5 nm的金纳米粒子。将该金纳米粒子以不同质量分数掺杂到向列相液晶4-正戊基4'-氰基联苯(5CB)中,研究了其对液晶黏度、阈值电压、相变温度的影响。结果表明,POSS修饰的金纳米粒子可以使液晶材料5CB的黏度降低、阈值电压减小。该金纳米粒子的掺入,拓宽了液晶材料的相变温度范围。

Effect of Polyhedral Oligomeric Silsesquioxanes-modified Gold Nanoparticles on 4-n-Pentyl-4'-ctanobiphenyl Liquid Crystal Properties

In order to effectively reduce the turn-on voltage of the liquid crystal device and low power consumption characteristics. Gold nanoparticles with an average particle diameter of about 5 nm were prepared by using polyhedral oligomeric silsesquioxanes(POSS) as the modification ligand and NaBH₄ as the reductant to reduce the chloroauric acid. Gold nanoparticles were doped into nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl(5CB) with different mass fractions to study its effect on the viscosity, the threshold voltage and the phase transition temperature. The results show that the viscosity and the threshold voltage of 5CB are decreased by doping with POSS modified gold nanoparticles. Moreover, the phase transition temperature range of 5CB is broadened by addition of the gold nanoparticles.