▎ 摘　　要

NOVELTY - Magnetic response intelligent optical material based on graphene nano sheet comprises graphene nano sheet, magnetic nano particles and liquid medium, where the magnetic nano particles are deposited on the graphene surface by liquid phase deposition, the mass ratio of the graphene nano sheet and the magnetic nano particles is 0.5:1-3:1, dispersing the graphene nano-sheet deposited with the magnetic particles in the liquid medium to form the suspension with the concentration of 10-15 wt.%. USE - The material is useful in the field of intelligent window, optical switch, anti-pseudo, and information encryption. ADVANTAGE - The method: ensures the control of the light transmittance under the action of the magnetic field; is simple; has stable performance; is environment-friendly, and can be produced in large scale. The material is in a light-transmitting state when the graphene nano-sheet is arranged in parallel to the viewing direction; has less light transmittance when the graphene nanometre sheet is vertical to the observing direction or random orientation; has dynamic adjustable transmittance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing Magnetic response intelligent optical material based on graphene nano sheet comprising using liquid phase deposition method to deposit the magnetic nano particles on the surface of the graphene nano sheet, uniformly dispersing the graphene nano sheet after deposition in the liquid medium according to the concentration of 10-15 wt.%, then packaging the formed dispersion between the gap formed by two parallel glass plates, obtaining the final magnetic field control of the intelligent window material, where the method specifically comprising (a) taking Fe3+/Fe2+ or Ni2+, Co2+, Zn26, Mg2+ in a molar ratio of 2:1, taking 0.8-2.0 g iron(III) chloride hexahydrate (FeCl3.6H2O) and iron(II) chloride tetrahydrate (FeCl2.4H2O) or nickel chloride hexahydrate (NiCl2.6H2O), cobalt(II) chloride hexahydrate (CoCl2.6H2O), zinc chloride (ZnCl2), magnesium chloride hexahydrate (MgCl2.6H2O) crystal hydrate, dissolving in 50 ml deionized water, and ultrasonically treating for 20-30 minutes, (b) adding 0.1-0.2 g nano graphene sheet in the solution, continuously performing ultrasonic stirring for 10-20 minutes until the graphene nano sheet is dispersed uniformly, (c) transferring the solution to 200 ml round bottom three-necked flask, continuously mechanically stirring for 200-400 revolutions/minute, slowly dropping the aqueous ammonia with the concentration of 20-28 wt.% into the bottle, adjusting the pH value of the solution to 7-9, (d) continuously reacting for 20-40 minutes, stopping stirring, magnetic separation of the reaction product in the solution, and repeatedly washing to remove surface impurities, drying for 4-6 hours at 40-50 degrees C to obtain the final product, (e) re-dispersing the product obtained in the step (d) in the liquid medium under the auxiliary action of ultrasonic wave to form the suspension liquid the concentration of 10-15 wt.%, (f) packaging the suspension between two parallel glass plates, forming magnetic response intelligent window material, (g) placing the packaged intelligent window material in the magnetic field, changing the light transmittance of the material by applying and removing the magnetic field, and realizing the reversible switching of the transparent-opaque state.