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Electrically-controlled light-dimming film capable of shielding near infrared light and preparation method thereof

A technology of near-infrared light and dimming film, applied in optics, nonlinear optics, instruments, etc., can solve the problems of high near-infrared light transmittance, unfavorable control room temperature rise, and limit the application of PDLC film, etc., and achieve broad application prospects , improve the heat insulation performance, and improve the shielding effect

Inactive Publication Date: 2019-05-14
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When applied to window films of buildings or automobiles, its high near-infrared light transmittance is not conducive to controlling indoor temperature rise in hot summer, which greatly limits the application of PDLC films in areas such as building energy conservation.

Method used

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  • Electrically-controlled light-dimming film capable of shielding near infrared light and preparation method thereof
  • Electrically-controlled light-dimming film capable of shielding near infrared light and preparation method thereof
  • Electrically-controlled light-dimming film capable of shielding near infrared light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The liquid crystal material selected in this embodiment is a nematic liquid crystal material named SLC-1717, purchased from Shijiazhuang Chengzhi Yonghua Liquid Crystal Material Co., Ltd. Those skilled in the art can also purchase related liquid crystals from other companies or mix and prepare them by themselves. The nanoparticles used in this embodiment are tungsten bronze nanoparticles provided by the Laboratory of Intelligent and Display Functional Materials of Peking University. Those skilled in the art can also purchase tungsten bronze nanoparticles from other companies or synthesize them by themselves, all of which can be applied to the preparation of the thin film of the present invention.

[0065] Since tungsten bronze nanoparticles are poorly dispersible in low-boiling polar solvents, the nanoparticles are modified by the following methods in this example to achieve their dispersion in ethanol solution:

[0066] Disperse 1g of tungsten bronze nanoparticles in ...

Embodiment 2

[0079] The liquid crystal material selected in this embodiment is a cholesteric liquid crystal material, which is formed by mixing the nematic liquid crystal material SLC-1717 used in Example 1 and the chiral compound S811 (90 parts by weight of SLC-1717 and 10 The S811 of weight part is mixed). Those skilled in the art can also purchase related liquid crystals from other companies or mix and prepare them by themselves. The nanoparticles used in this embodiment are indium tin oxide nanoparticles provided by Shanghai Huzheng Nano Technology Co., Ltd. Those skilled in the art can also purchase nanoparticles from other companies or synthesize them by themselves, all of which can be applied to the preparation of the thin film of the present invention.

[0080] Since indium tin oxide nanoparticles are poorly dispersible in low-boiling polar solvents, the nanoparticles are modified by the following methods in this example to achieve their dispersion in ethanol solution:

[0081] T...

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Abstract

The invention discloses an electrically-controlled light-dimming film capable of shielding near infrared light and preparation method thereof. The comprises a macromolecule network, liquid crystal molecules and nano-particles; the liquid crystal molecules are dispersed in the macromolecule network; the nano-particles are dispersed between the macromolecule network and the liquid crystal molecules;and the nano-particles have absorption at the near infrared wavebands of the 780nm to 3000nm. The nano-particles capable of shielding the near infrared light can be dopted into the polymer dispersionliquid crystal electrically-controlled light-dimming film, the prepared electrically-controlled light-dimming film can shield more than 95% of near infrared light in the 780nm to 3000nm wave bands under an open state. The provided preparation method disclosed by the invention can effectively improve the heat insulating property of the electrically-controlled light-dimming film, and the electrically-controlled light-dimming film has extensive application prospect at the building energy conservation field.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of functional liquid crystal materials, and in particular relates to an electronically controlled dimming film capable of shielding near-infrared light and a preparation method thereof. Background technique [0002] Polymer dispersed liquid crystal (PDLC) is a composite material in which liquid crystal droplets are uniformly dispersed in a continuous polymer matrix, and can switch between a transparent state and a scattering state by applying a voltage. In the absence of an applied electric field, the directors of the liquid crystal droplets are randomly distributed, and due to the mismatch between the effective refractive index of the light passing through the liquid crystal droplets and the refractive index passing through the polymer matrix, multiple occurrences occur at the interface between the liquid crystal and the polymer. Refraction makes the PDLC film exhibit a strong...

Claims

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Application Information

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IPC IPC(8): G02F1/1334G02F1/137
Inventor 杨槐梁霄陈梅张兰英
Owner PEKING UNIV
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