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High-brightness chromogenic film as well as preparation method and application thereof

A high-brightness, thin-film technology, applied in nanotechnology, optics, instruments, etc. for materials and surface science, can solve the problems of complex preparation methods and low brightness of color-producing films

Active Publication Date: 2021-09-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of low brightness and complicated preparation methods of the color-forming film in the prior art, and provide a high-brightness color-producing film, which has high brightness and can observe different colors at different angles , the preparation method of the chromogenic film is environmentally friendly, simple and low in cost, and has potential application value in the fields of anti-counterfeiting, display and sensing

Method used

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  • High-brightness chromogenic film as well as preparation method and application thereof
  • High-brightness chromogenic film as well as preparation method and application thereof
  • High-brightness chromogenic film as well as preparation method and application thereof

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preparation example Construction

[0065] The second aspect of the present invention provides a method for preparing the high-brightness color-forming film of the present invention, wherein the method includes the following steps: using a self-assembly method to realize the assembly of nanoparticles on the surface of the substrate, that is, to obtain the high-brightness color-forming film. color film.

[0066] In the present invention, the self-assembly means that nanoparticles spontaneously form an ordered stacking structure based on the interaction of non-covalent bonds.

[0067] According to the invention, the method comprises dispersing nanoparticles in a solvent to obtain a colloid containing nanoparticles, and assembling said colloid on the surface of a substrate.

[0068] In the present invention, the solvent is not particularly limited, and may be a solvent that can well disperse the nanoparticles, such as water and / or ethanol.

[0069] Furthermore, the volume ratio of the nanoparticles, water and etha...

Embodiment 1

[0090] (1) A polystyrene bead emulsion with a mass fraction of 5% by weight and a particle size of 600nm is prepared as a mixed solution at a volume ratio of emulsion: water: absolute ethanol = 1:1:2, and ultrasonically dispersed for 10 minutes to make it uniform;

[0091] (2) Cut out a 2cm×2cm metal sheet, clean it and use oxygen plasma for hydrophilic treatment, place it in a glass petri dish, pour an appropriate amount of ultrapure water, and make the liquid level higher than the surface of the substrate and in contact with the placed silicon The slices are tangent; use a pipette gun to draw an appropriate amount of polystyrene beads mixed solution, and drop it on the silicon wafer. The rapid volatilization of ethanol in the mixed solution will drive the polystyrene beads to spread on the liquid surface and assemble. After the diffusion is complete, use a pipette gun to absorb an appropriate amount of the mixed solution and drop it on the liquid surface, and repeat it severa...

Embodiment 2

[0095] A high-brightness chromogenic film was prepared in the same manner as in Example 1, except that in step (2), the 2cm×2cm metal sheet was replaced with a 2cm×2cm silicon chip to obtain a chromogenic film S2 , its brightness and R, G, B values ​​are shown in Table 1. Such as image 3 As shown, the chromogenic film S2 can observe different colors under different angles, specifically, Figure 3-1 displayed in purple; Figure 3-2 displayed in blue; Figure 3-3 displayed in cyan; Figure 3-4 displayed in green; Figure 3-5 displayed in yellow; Figure 3-6 displayed in orange; Figure 3-7 Displayed in red.

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Abstract

The invention relates to the field of preparation of new chromogenic materials, and discloses a high-brightness chromogenic film as well as a preparation method and application thereof. The high-brightness chromogenic film comprises a substrate and at least one photonic crystal layer, the reflectivity of the substrate is greater than or equal to 10%; the photonic crystal layer is formed by self-assembling nano particles on the surface of the substrate; the particle size of the nano particles is 50 to 1,500 nm. The chromogenic film is high in brightness, and different colors can be observed at different angles. The preparation method of the chromogenic film is environmentally friendly, simple and low in cost. The chromogenic film has potential application value in the fields of counterfeiting prevention, display, sensing and the like.

Description

technical field [0001] The invention relates to the field of preparation of new color-generating materials, in particular to a high-brightness color-generating film and its preparation method and application. Background technique [0002] Colors in nature can be classified into two categories: chemical colors and structural colors. Chemical color is essentially due to the transition of valence electrons in material molecules, without angle dependence, such as pigments and dyes. Different from chemical color, structural color is the color produced by the interaction of light and material structure, which has the characteristics of angle dependence. Compared with dyes, structural colors are more stable, environmentally friendly, and will not fade. Photonic crystals can produce brilliant structural colors, such as butterfly wings and peacock feathers, due to their regular arrangement of periodic micro-nano structures. [0003] CN104418972A discloses a photonic crystal capsul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B1/04G02B5/02G02B5/08B82Y30/00B82Y40/00
CPCG02B1/005G02B1/04G02B5/08G02B5/0268G02B5/0215G02B5/0226B82Y40/00B82Y30/00
Inventor 李明珠袁磊宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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