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液晶材料电学特性随温度变化研究
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作者 吴楠 黄一洋 +7 位作者 张娇 范亚凝 房朴洋 孔祥明 蔡明雷 赵桐州 杨长勇 叶文江 《液晶与显示》 CAS CSCD 北大核心 2021年第12期1605-1613,共9页
温度变化会对液晶材料的电学特性产生影响。为了深入探究低温下液晶材料的电学特性,首先,液晶盒厚度和取向层厚度分别由紫外可见分光光度计和表面轮廓仪测量得到;然后,利用精密热台以及基于热电制冷工作原理自制的制冷装置控制液晶盒的... 温度变化会对液晶材料的电学特性产生影响。为了深入探究低温下液晶材料的电学特性,首先,液晶盒厚度和取向层厚度分别由紫外可见分光光度计和表面轮廓仪测量得到;然后,利用精密热台以及基于热电制冷工作原理自制的制冷装置控制液晶盒的温度,使用校准后的精密LCR表分别测得低温和常温下液晶盒电容-电压(C-U)特性曲线,由液晶盒电容模型得到液晶层C-U特性曲线,基于该曲线与双盒模型,得到了温度对4种液晶介电各向异性、弹性常数的影响。实验结果表明随着温度的升高,正性液晶材料的介电各向异性从10.0增大至21.0,弹性常数k_(11)从17.0 pN减小至7.0 pN,k_(33)从31.0p N减小至16.0 pN;负性液晶材料的介电各向异性从-8.5增大至-3.0,k_(11)从21.0 pN减小至11.0 pN,k_(33)从31.0 pN减小至13.0 pN。即随着温度的升高,正性液晶材料的介电各向异性和弹性常数k_(11)、k_(33)均不断减小;负性液晶材料的介电各向异性不断增大,k_(11)、k_(33)呈现减小趋势。该结论对探究低温下提升液晶显示性能的方法有着重要意义。 展开更多
关键词 介电各向异性 弹性常数 热电制冷 液晶盒电容模型 双盒模型
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Stability of liquid crystal systems doped withγ-Fe_(2)O_(3)nanoparticles
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作者 Xu Zhang Ningning Liu +9 位作者 Zongyuan Tang Yingning Miao Xiangshen Meng Zhenghong He Jian Li Minglei Cai Tongzhou Zhao Changyong Yang Hongyu Xing Wenjiang Ye 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第9期364-370,共7页
In order to explore the stability of a liquid crystal(LC)system doped withγ-Fe_(2)O_(3)nanoparticles,the physical properties(clearing point,dielectric properties),electro-optical properties and residual direct-curren... In order to explore the stability of a liquid crystal(LC)system doped withγ-Fe_(2)O_(3)nanoparticles,the physical properties(clearing point,dielectric properties),electro-optical properties and residual direct-current voltage(RDCV)of the doped LC system were measured and evaluated at different times.First,the temperature was controlled by precision hot stage,and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope.Using a precision LCR meter,we measured the capacitance-voltage curves of the doped LC system at the temperature of 27℃.The dielectric constant of doped LC was calculated by the dualcell capacitance method.Then,the electro-optical properties of the doped LC system were measured.Finally,the RDCV of the doped LC system was measured and calculated.After five months,the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability.The experimental results show that,within five months,the clearing point change rate of doped LC is in the range of 0.24%-1.37%,the change of dielectric anisotropy is in the range of 0.035-0.2,the curves of electro-optical properties are basically fitted,and the change rate of saturated RDCV is about 11.2%,which basically indicate that the LC system doped withγ-Fe_(2)O_(3)nanoparticles has good stability. 展开更多
关键词 γ-Fe_(2)O_(3)nanoparticles stability of liquid crystal system clearing point dielectric properties electro-optical properties
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