Method for preparing wide-wave reflection film based on ZIFs bidirectional diffusion method

[0026] Production of liquid crystal cell: Cut the glass coated with indium tin oxide on one side into a size of 2cm×3cm, wash it twice with washing powder, clean water, deionized water and ethanol each, place it in a clean glass petri dish, and dry it for later use. Weigh 100 mg of ZIF-8 in a round-bottomed flask containing 100 ml of methanol with magnetic stirring and ultrasonication for 1 hour. After standing for 12 hours, it was centrifuged, washed and filtered with methanol. . Put the processed ZIF-8 into an ampoule, then connect the vacuum pump through the connector, and use the vacuum pump to draw out the air, so that the inside of the device is in a vacuum state for 10 minutes. Weigh 120 mg of the chiral dopant R5011 and 60 mg of the ultraviolet absorbing dye UV-327, respectively add them into two 20 mL portions of ethyl acetate to obtain a mixed solution, and use ultrasonic vibration to mix uniformly. Then two parts of 40 mg of vacuum-treated ZIF-8 were placed in the eth

[0042] Production of liquid crystal cell: The ZIF-8 / R5011 composite material and the ZIF-8 / UV-327 composite material in Example 1 were mixed with methanol to prepare a 6 mg / ml mixed solution and mixed uniformly. 0.1ml of the mixed solution was evenly drop-coated on the treated glass substrate. After the drop-coating, it was dried on a hot table and evaporated to obtain a composite film containing ZIF-8 / UV-327 and ZIF-8 / R5011. Material thin glass substrate. Then, the liquid crystal cell was assembled in the same manner as in Example 1, and then stored in a 60° C. oven.

[0043] Sample 2 was obtained according to the mass ratio and diffusion and polymerization conditions of the liquid crystal system in Example 1, and the polymerizable monomer was cured and crosslinked to form a network to obtain the final polymer network cholesteric liquid crystal film. The transmission spectrum of the sample can be measured at room temperature using an ultraviolet-visible-near-infrared

[0045] Production of liquid crystal cell: The ZIF-8 / R5011 composite material and the ZIF-8 / UV-327 composite material in Example 1 were mixed with methanol to prepare a mixed solution of 8 mg / ml and mixed uniformly. 0.1ml of mixed solution was evenly drop-coated on the treated glass substrate, used after drip-coating, dried on a hot table, and after volatilizing the solvent, a film containing ZIF-8 / UV-327 composite material and ZIF-8 / R5011 composite material were prepared. Material thin glass substrate. Then, the liquid crystal cell was assembled in the same manner as in Example 1, and then stored in a 60° C. oven.

[0046] Sample 3 was obtained according to the mass ratio of the liquid crystal system and the polymerization conditions in Example 1, and the polymerizable monomer was cured and crosslinked to form a network to obtain the final polymer network cholesteric liquid crystal film. The transmission spectrum of the sample can be measured at room temperature using