186 results about "Dielectric anisotropy" patented technology

The invention discloses a liquid crystal compound, the structural formula of the liquid crystal compound is as shown in the following formula I, # imgabs0. The liquid crystal compound has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, the liquid crystal composition containing the liquid crystal composition has large dielectric anisotropy delta epsilon, high elastic constant K, good low-temperature intersolubility, small rotary viscosity gamma 1 and large elastic constant K, and can be used for developing liquid crystal display elements or liquid crystal displays which have high response speed and can effectively improve residual images.

According to the photopolymer system based on the fluorine-containing liquid crystal, the grating device and the preparation method of the grating device, the mixed liquid crystal containing the nematic liquid crystal and the fluorine-containing liquid crystal at the same time is adopted in the photopolymer system, and therefore the polarity and dielectric anisotropy of the mixed liquid crystal material are improved; the overall electro-optical performance, uniformity and stability of the photopolymer system are improved, so that a grating device prepared based on the photopolymer system has good optical characteristics of low haze while having relatively high diffraction efficiency. Specifically, fluorine-containing biphenyl liquid crystals, fluorine-containing alkyne liquid crystals and fluorine-containing difluoromethoxy liquid crystals of which the carbon atoms of flexible side chains are 2-5, and nematic liquid crystals of which the delta epsilon is not less than 10 are selected to jointly form mixed liquid crystals; and the balance and optimization between the diffraction efficiency and haze performance of the photopolymer system and the grating device prepared from the photopolymer system are realized.

The embodiment of the invention discloses a compound, a liquid crystal composition and application thereof, relates to the technical field of liquid crystals, and is used for solving the technical problem that the service life of electronic equipment is short due to the fact that a liquid crystal material is poor in material performance and high in material performance attenuation speed. The compound has a structure as shown in a formula (I). # imgabs0 # wherein X1 and X2 are each independently selected from the group consisting of hydrogen, deuterium, tritium, at least one halogen, and at least one hydrocarbyl group, and at least one of X1 and X2 is not hydrogen. The compound has higher birefringence, better dielectric anisotropy, lower rotary viscosity, higher clearing point, better low-temperature stability and the like, and when the compound is used as a liquid crystal compound, the performance degradation speed of a liquid crystal material is slow, so that the service life of electronic equipment can be prolonged.

LCoS panels using liquid crystal (LC) media having negative dielectric anisotropy and LC media comprised therein. The liquid crystal material (LC medium) has negative dielectric anisotropy and high optical anisotropy and is particularly useful in electro-optical displays including projection systems based on vertical alignment (VA) nematic panels.

The invention relates to the technical field of heat exchange of capacitor filling polyurethane, and particularly discloses a cooling system and method and application. According to the system, through the synergistic effect of the temperature control module and the electric field control module, a temperature difference field and an electric field are constructed for the composite heat conduction module, and dielectric anisotropy nanosheets are induced to form a highly-oriented ordered structure in a resin matrix, so that the heat conduction efficiency of the capacitor is remarkably improved, the filling concentration of the dielectric anisotropy nanosheets is reduced, and the service life of the capacitor is prolonged. And directional arrangement of the dielectric anisotropic nanosheets is realized with a relatively low electric field intensity threshold. Compared with the prior art, the scheme not only breaks through the technical bottleneck of high filling amount of the traditional heat-conducting filler, but also reduces the directional driving force provided by an electric field through a field coupling effect, shows remarkable economic benefits and engineering application values, and solves the problems that the existing heat-conducting composite system is large in filling amount and poor in synergy heat-conducting property in all directions.