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No-crack photonic crystal having low angle dependence in color generation, and preparation method thereof

A photonic crystal, dependent technology, used in optics, optical components, instruments, etc., can solve the problems of dim color, reduce the effective refractive index of photonic crystals, and affect optical performance, and achieve the effect of eliminating tensile stress.

Inactive Publication Date: 2017-09-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can be used to self-assemble crack-free photonic crystals, the optical properties of crack-free photonic crystals prepared by adding additional substances are easily affected, mainly because the additional additives will reduce the effective refraction of photonic crystals. rate, so that its color becomes dull, or even colorless; and the cost of special substrates is relatively high, and it is not easy to carry out large-scale production
More importantly, the crack-free photonic crystals prepared in the previous research are all face-centered cubic stacking structures, and the structural color presented will change with the change of the viewing angle, which has certain advantages in the application of color display. limitation, the search for crack-free photonic crystals with no angle dependence becomes increasingly important

Method used

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  • No-crack photonic crystal having low angle dependence in color generation, and preparation method thereof
  • No-crack photonic crystal having low angle dependence in color generation, and preparation method thereof
  • No-crack photonic crystal having low angle dependence in color generation, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] (1) The polystyrene emulsion with an average particle size of microspheres of 200 nm and good monodispersity was synthesized by soap-free emulsion polymerization. The dispersion index of the polymer in the emulsion was 0.018; the prepared polystyrene emulsion was prepared at 4000 Centrifuge at r / min for 30 min, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene microsphere powder;

[0033] (2) Prepare 50ml of tris-hydrochloric acid buffer solution (pH = 8.3) with a concentration of 10 mmol / L; add 0.05g of polystyrene microsphere powder into the buffer solution, and ultrasonically disperse it for 15 minutes. Immediately add 0.025g of dopamine hydrochloride, and stir magnetically for 20 h at room temperature to prepare a polystyrene@polydopamine core-shell microsphere emulsion; Centrifuge for 30 minutes, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene@polydopamine microsphere powder;

[0034] Th...

Embodiment 2

[0040] (1) A polystyrene emulsion with an average particle size of microspheres of 220 nm and good monodispersity was synthesized by soap-free emulsion polymerization. The dispersion index of the polymer in the emulsion was 0.024; the prepared polystyrene emulsion was prepared at 4000 Centrifuge at r / min for 30 min, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene microsphere powder;

[0041] (2) Prepare 50ml of tris-hydrochloric acid buffer solution (pH = 8.5) with a concentration of 10 mmol / L; add 0.1g of polystyrene microsphere powder into the buffer solution, and ultrasonically disperse it for 15 minutes. Immediately add 0.05 g of dopamine hydrochloride, and stir magnetically for 22 h at room temperature to prepare polystyrene@polydopamine core-shell microsphere emulsion; Centrifuge for 30 minutes, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene@polydopamine microsphere powder;

[0042] The enl...

Embodiment 3

[0046] (1) A polystyrene emulsion with an average particle size of microspheres of 350 nm and good monodispersity was synthesized by soap-free emulsion polymerization. The dispersion index of the polymer in the emulsion was 0.046; the prepared polystyrene emulsion was prepared at 4000 Centrifuge at r / min for 30 min, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene microsphere powder;

[0047] (2) Prepare 50 ml of tris-hydrochloric acid buffer solution (pH = 8.7) with a concentration of 10 mmol / L; add 0.15 g of polystyrene microsphere powder into the above buffer solution, and ultrasonically disperse it for 15 min. Immediately add 0.075 g of dopamine hydrochloride and stir magnetically at room temperature for 24 h to prepare polystyrene@polydopamine core-shell microsphere emulsion; Centrifuge for 30 minutes, pour off the supernatant, dry in a vacuum oven at 50°C, and grind to obtain polystyrene@polydopamine microsphere powder;

[0048] Th...

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Abstract

The invention discloses a no-crack photonic crystal having low angle dependence in color generation, and a preparation method thereof. According to the method, a soap-free emulsion polymerization method is utilized to prepare polystyrene emulsion, and centrifugation, drying and grinding are carried out to acquire polystyrene microsphere powder; dopamine hydrochloride is utilized to realize oxidation self-polymerization reaction under the weak alkaline environment, and a polydopamine casing layer is covered at a surface of the polystyrene microsphere to acquire polystyrene@polydopamine microsphere powder; common self-assembly of the polystyrene@polydopamine core casing structure microsphere and (3-Aminopropyl)-trimethoxysilane is carried out to acquire the no-crack photonic crystal having low angle dependence in color generation. The method is advantaged in that the process is simple and easy, environmental protection and safe and non-toxic property are realized, a prepared photonic crystal film has no crack and has low angle dependence, and the method has wide application prospects in the color display field including paint, cosmetics, weaving and ceramic aspects.

Description

technical field [0001] The invention belongs to the technical field of photonic crystal structural color preparation, and in particular relates to a crackless photonic crystal with low angle dependence of color rendering and a preparation method thereof. Background technique [0002] Inspired by the biological structural color in nature, the special ability to control light possessed by photonic crystal structures has attracted extensive attention of researchers. In recent years, the method of artificially preparing photonic crystals has developed from the initial "top-down" method, that is, semiconductor processing technologies such as mechanical drilling, photolithography, and ion beam etching, to self-assembly of basic units. "Bottom-up" methods, such as vertical deposition, gravity sedimentation, spin coating, spray coating, and drop coating methods. However, in the process of self-assembly of colloidal particles, affected by the adhesion of the substrate and the tensil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00
Inventor 沈慧芳易波
Owner SOUTH CHINA UNIV OF TECH
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