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Method for preparing organic-inorganic photonic crystal composite microspheres in batches

A technology of photonic crystals and composite microspheres, applied in the field of material science, can solve problems such as poor structural stability, affecting structural color, and easy contamination of internal pores, and achieves the effects of low cost, fast preparation, and easy mass production

Pending Publication Date: 2022-04-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Nanoparticles inside the reported photonic crystal microspheres are generally combined by van der Waals force, the structure stability is poor and the internal pores are easily polluted, which affects its structural color and limits its application.

Method used

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  • Method for preparing organic-inorganic photonic crystal composite microspheres in batches
  • Method for preparing organic-inorganic photonic crystal composite microspheres in batches
  • Method for preparing organic-inorganic photonic crystal composite microspheres in batches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation process and mechanism of batch preparation of organic-inorganic photonic crystal composite microspheres are as follows: figure 1 shown.

[0043] (1) adopt the improved Methods for the synthesis of monodisperse SiO 2 Monodisperse colloidal nanoparticles: Mix 4.25ml ammonia water, 27.70ml ethanol and 43.05ml deionized water as solution A, and mix 6.75mL tetraethylorthosilicate (TEOS) and 68.25mL ethanol as solution B. After mixing solutions A and B evenly, quickly add solution B into solution A, stir rapidly for 2 minutes, and react at 30°C for 5 hours under continuous stirring. Centrifuge the obtained milky white solution with absolute ethanol for three times, then centrifuge at low speed to remove large particles at the bottom of the centrifuge tube, and then centrifuge at high speed to collect the bottom sediment to remove small particles that have not precipitated in the supernatant, and then dry it twice in a row to obtain SiO with uniform particl...

Embodiment 2

[0053] (1) adopt the improved Methods for the synthesis of monodisperse SiO 2 Monodisperse colloidal nanoparticles: the experimental process is the same as in Example 1, and the particle size is about 235nmSiO 2 For monodisperse colloidal nanoparticles, add 17.80mL of ammonia water to a flask containing 23.40mL of absolute ethanol. After mixing evenly, add 33.80mL of double distilled water. After further stirring evenly, use it as liquid A for subsequent use. Other conditions are the same as in Example 1.

[0054] (2) Preparation of dispersed phase solution and continuous phase solution: weigh 0.02g of prepared SiO 2 The colloidal nanoparticles were dissolved in 2 mL of hydroxypropyl acrylate monomer, dispersed evenly by ultrasonication, and 4 μL of cross-linking agent oxalic acid diacrylate was added, and the amount of cross-linking agent added was 0.2% of the amount of hydroxy acrylate monomer. Add the initiator potassium persulfate of 0.01g again, the initiator add-on is...

Embodiment 3

[0059] (1) adopt the improved Methods for the synthesis of monodisperse SiO 2 Monodisperse colloidal nanoparticles: the experimental process is the same as in Example 1, and the particle size is about 300nm SiO 2For monodisperse colloidal nanoparticles, add 23.80mL of ammonia water to a flask containing 23.40mL of absolute ethanol. After mixing evenly, add 27.80mL of double-distilled water. After further stirring evenly, use it as liquid A for subsequent use. Other conditions are the same as in Example 1.

[0060] (2) Preparation of dispersed phase solution and continuous phase solution: weigh 0.50g of prepared SiO 2 Colloidal nanoparticles were dissolved in 2mL of hydroxypropyl methacrylate monomer, ultrasonically dispersed, and 20 μL of cross-linking agent succinate diacrylate was added. The amount of cross-linking agent added was 1% of the amount of hydroxy acrylate monomer. Add 0.04g of initiator azobisisobutyronitrile, the amount of initiator added is 2% of the amount ...

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Abstract

The invention discloses a method for preparing organic-inorganic photonic crystal composite microspheres in batches, which comprises the following steps: dispersing SiO2 nanoparticles in an acrylic hydroxyl ester monomer, adding an initiator and a cross-linking agent, dividing the mixture into a large number of small liquid drops by an SPG membrane emulsifier, and heating to initiate polymerization under the confinement effect of the liquid drops to obtain the organic-inorganic photonic crystal composite microspheres. The monomer polymerization process and the SiO2 nano-particle self-assembly process are synchronously carried out, and the organic-inorganic photonic crystal composite microspheres with SiO2 nano-particles locked in a cross-linked network are formed. According to the crystal microsphere, the bright structural color is ensured, the structural stability is improved, and the color stability is improved. The method has the advantages of low cost, simplicity in operation, rapidness in preparation, excellent performance and the like, the small-particle-size organic-inorganic photonic crystal composite microspheres with controllable and uniform particle sizes can be prepared, and industrial batch production is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing photonic crystal microspheres, in particular to a method for preparing organic-inorganic photonic crystal composite microspheres in batches, and belongs to the field of material science. Background technique [0002] At present, most of the chemical pigments used in industry are composed of organic chemicals, which will cause serious environmental pollution, and are easy to fade over time or exposed to sunlight. Unlike the absorption of specific wavelengths that results in the reflection of other wavelengths, structural colors arise from the interference, diffraction, or scattering of light from micro- or nanostructures with length scales on the order of the wavelength of light. This chromogenic mechanism does not exhibit photobleaching and can generate a wide range of colors in a nontoxic and environmentally friendly manner. [0003] Colloidal photonic crystals, which are periodically arranged monodispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/20C08F222/14C08F212/36
Inventor 丁收年吴升铜杨帆韩雪莲陈平
Owner SOUTHEAST UNIV
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