查询词典 liquid crystals

Six lateral difluorine substituted tolan -type liquid crystals were synthesized via Sonogashira cross-coupling of 4-alkylphenylacetylene and 4-iodo-2,3-difluoro-1-alkoxybenzene under the protection of argon.

用邻二氟苯为起始原料，在-78℃经过两次选择性"邻位金属化"反应、醚化反应、氧化反应制得2，3-二氟-4-碘-1-烷氧基苯，再与4-烷基苯乙炔在氩气保护下进行Sonogash ira偶联反应，制备出6种侧向二氟取代二苯乙炔类液晶。

Depending on the voltage of the electrical charge running through them, liquid crystals will untwist so that the intensity of light able to pass through the second polarized pane is affected.

依据他们的充满电荷的电压，液晶将分解，因此能够被透过第2 个极化的偏光镜的光的强度影响。

A series of liquid crystals containing naphthalene 1~13 was synthesized by the reaction of carbonyl compound with Grignard reagent and coupling reaction between phenyl boronic acid and halogen naphthalene .

经羰基化合物与格氏试剂反应及芳基硼酸与萘基卤化物偶联反应合成了系列含萘环骨架液晶化合物1~13；产率在73%~759%。

On the base of analysis of the process texture transition of cholesteric liquid crystals, I studied electrooptic properties of NW-PSCTLC systematically.

在分析了胆甾液晶中的织构转变过程的基础上，对NW-PSCTLC的电光特性进行了系统研究。

ABSTRACT NW/NB-PSCTLC has been prepared by doping a small amount of diacrylate monomer in cholesteric liquid crystals.

在胆甾相液晶中掺入少量的单体材料分别制备了常白和常黑模式PSCTLC。

In chapter 2,we establish theformulation of the extended mean-field theory that can be applied to cholesteric liquidcrystals,and we apply this extended mean-field theory to study the helical structure ofcholesteric liquid crystals.

在第二章中，我们将文献[6]中丝状液晶中的广义平均场方法推广到了螺旋状液晶体系，并用这一方法讨论了螺旋状液晶中分子指向矢的螺旋结构。

The phase transition and states of the lyotropic liquid crystals of chitosan in dichloroacetic acid were studied by polarized microscopy.

借助偏光显微镜研究了不同壳聚糖样品在二氯乙酸中的液晶相转变和液晶状态。

Electrooptic properties of NW/NB-PSCTLC has been systematically studied and optimized on the basis of investigation of morphology and alignment of polymer network formed in liquid crystals.

本文从研究液晶中形成的聚合物网络的形貌和排列特性出发，对两种模式PSCTLC的电光特性进行了系统地研究和优化。

The DSC result and the observation of polarizing microscope indicate that PPC and BPC are thermotropic polymer liquid crystals exhibiting cholesteric reflection color at room temperature.

DSC的表征和偏光显微镜的观察结果表明，HPC和BPC是室温下处于液晶状态的热致胆甾型高分子液晶。

Also, there is a tendency for the voltage at a row-column intersection to "bleed" over into neighboring pixels, partly untwisting the liquid crystals and blocking some light from passing through the surrounding pixel area.

此外，行-列交点处的电压也容易泄露到相邻的像素点上，这会在一定程度上造成周围区域像素的液晶变得不透明，阻碍光线的通过。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。