▎ 摘　　要

NOVELTY - Preparing micro-nano fiber membranes based on structural color comprises (i) adding nano-microspheres to the solvent ethanol or water, magnetically stirring and ultrasonically dispersing, obtaining a dispersion liquid; (ii) adding the black material into N,N dimethylformamide at a mass concentration of 0.1-5%, and ultrasonically treating for 30-60 minutes, adding acetone, adding polyvinylidene fluoride according to the mass concentration of 8-16%, magnetically stirring for 3-6 hours, and naturally cooling to room temperature to obtain a spinning solution; (iii) soaking the micro-nanofibrous membrane in ethanol at room temperature, and placing in a flat-bottomed vessel, slowly pouring the dispersion at 50-70 ml/cm2on the surface of the micro-nanofiber membrane, and allowing to stand for 20-48 hours, uniformly depositing the nanometer microspheres under the action of gravity on the micronanofibrous membrane to obtain the micronanofibrous membrane based on the structural color. USE - The method is useful for preparing micro-nano fiber membranes based on structural color. ADVANTAGE - The method is simple and effectively reduces the multiple incoherent scattering in the structural color material, improves the color saturation, and prevents the color from photobleaching. The fiber membranes has uniform and bright color and does not need any dyes. DETAILED DESCRIPTION - Preparing micro-nano fiber membranes based on structural color comprises (i) adding the nano-microspheres to the solvent ethanol or water, magnetically stirring and ultrasonically dispersing, obtaining a dispersion liquid with a mass fraction of 1-5 wt.%, where the particle size of the nano-microspheres is 150-420 nm, and the monodispersity index is ≤ 0.1, and the solvent is ethanol or water; (ii) adding the black material into N,N dimethylformamide at a mass concentration of 0.1-5%, and ultrasonically treating for 30-60 minutes, adding acetone according to the mass ratio of N, N dimethylformamide: acetone is 3:2, adding polyvinylidene fluoride according to the mass concentration of 8-16%, magnetically stirring for 3-6 hours under the condition of a water bath with a temperature of 40-60°C, and naturally cooling to room temperature to obtain a spinning solution and using electrospinning process to prepare micro-nano fiber membrane; (iii) soaking the micro-nanofibrous membrane in ethanol at room temperature, and placing in a flat-bottomed vessel, slowly pouring the dispersion at 50-70 ml/cm2 on the surface of the micro-nanofiber membrane, and allowing to stand for 20-48 hours, uniformly depositing the nanometer microspheres under the action of gravity on the micronanofibrous membrane to obtain the micronanofibrous membrane based on the structural color. An INDEPENDENT CLAIM is also included for micro-nano fiber membranes based on structural color prepared by the above method.