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Amorphous photonic crystal structure-color material with photocatalytic effect and preparation method thereof

A photonic crystal, photocatalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of strong ultraviolet reflection, limited application, color damage, etc. Efficiency, excellent photocatalytic effect, high color saturation effect

Inactive Publication Date: 2019-08-23
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

The structural unit of the generally prepared photonic crystal is a white powder, which must self-assemble into a hexagonal close-packed structure before it can have a bright structural color (CN103288491A), so the functional application of photonic crystals is limited by the arrangement of micro-nano structures. Realize mass production and application (CN104829141A, CN104817282A)
At the same time, the color produced by photonic crystal structure has iridescent effect and strong ultraviolet reflection, which limits its application in flat display and photoelectric conversion.
Researchers usually use carbon black raw materials to prepare non-angle-dependent structural pigments. Ultrafine carbon powder as a black substrate can absorb incoherent scattered light generated by photonic crystals, but the influence of blackness on the presentation of different tones is complicated. The doping process The amount of carbon powder needs to be precisely controlled (CN107121714A)
At the same time, the use of carbon elements introduced by organic matter in the preparation process of photonic crystal structural units can produce structural pigments with high color saturation, but the pigments will be destroyed in high-temperature oxidative environments, which limits this angle-free structural pigments. Scope of application (CN105174302A, CN105174301A)
[0003] Amorphous photonic crystal structure can present angle-independent structural color due to its short-range disordered structure, soft color, and a wide range of applications. However, until now, angle-independent structural color materials with photocatalytic effects are still little known. Researchers report on this

Method used

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  • Amorphous photonic crystal structure-color material with photocatalytic effect and preparation method thereof
  • Amorphous photonic crystal structure-color material with photocatalytic effect and preparation method thereof
  • Amorphous photonic crystal structure-color material with photocatalytic effect and preparation method thereof

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preparation example Construction

[0032] The preparation method of the amorphous photonic crystal structural color material with photocatalytic effect disclosed by the present invention comprises the following steps:

[0033] 1) SiO with controllable size 2 Preparation of microspheres

[0034] Dissolve ammonia water in absolute ethanol and mix for 0.5h, dissolve ethyl orthosilicate in absolute ethanol and mix for 0.5h, then drop the ethanol solution of tetraethyl orthosilicate into the ethanol solution of ammonia water, so that the concentration of ammonia water is 0.2 -0.8mol / L, the concentration of ethyl orthosilicate is 0.4-1.2mol / L, 25~40℃ constant temperature stirring for 2~8h, after the reaction is completed, centrifuge, wash and dry to obtain SiO 2 microsphere powder.

[0035] 2)SiO2 2 Modification of Microspheres

[0036] SiO with a particle size of 240±5nm 2 The microsphere powder is dispersed in a mixed solution of ethanol and acetonitrile (the volume ratio of ethanol and acetonitrile is 3:1), a...

Embodiment 1

[0041] A method for preparing an amorphous photonic crystal structural color material with photocatalytic effect, comprising the following steps:

[0042] 1) SiO with controllable size 2 Preparation of microspheres

[0043] Mix ammonia water and absolute ethanol at a molar ratio of 1:6 for 1 h, and mix ethyl orthosilicate and absolute ethanol at a molar ratio of 1:10 for 0.5 h, then add ammonia water and absolute ethanol dropwise at a rate of 0.12 mL / min. In the mixed solution of ethanol, stir at 40°C for 2 hours at a constant temperature. After the reaction is completed, centrifuge, wash, and dry to obtain SiO 2 Powder. In the preparation process, the consumption of ammonia water is 0.01mol, and the consumption of ethyl orthosilicate is 0.02mol;

[0044] 2)SiO2 2 Modification of Microspheres

[0045] Weigh 0.2g of SiO with a particle size of 240±5nm 2 The microsphere powder was dispersed in a mixed solution of 100mL ethanol and acetonitrile (volume ratio 3:1), and 0.5mL...

Embodiment 2

[0049] 1) SiO with controllable size 2 Preparation of microspheres

[0050] Mix ammonia water and absolute ethanol at a molar ratio of 1:8 for 1 hour, and mix ethyl orthosilicate and absolute ethanol with a molar ratio of 1:5 for 0.5 h, then add ammonia water and absolute ethanol dropwise at a rate of 0.02 mL / s. In the mixture of ethanol, stir at 36°C for 4h at a constant temperature. After the reaction is completed, centrifuge, wash, and dry to obtain SiO 2 Powder. In the preparation process, the consumption of ammonia water is 0.02mol, and the consumption of ethyl orthosilicate is 0.04mol;

[0051] 2)SiO2 2 Modification of Microspheres

[0052] Weigh 0.25g of SiO with a particle size of 240±5nm 2 The microsphere powder was dispersed in a mixed solution of 100mL ethanol and acetonitrile (volume ratio 3:1), and 0.5mL ammonia water was added at room temperature for ultrasonic mixing to obtain ammonia-modified SiO 2 Emulsion of microspheres;

[0053] 3) SiO 2 @TiO 2 mat...

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Abstract

The invention belongs to the technical field of structural-color material preparation, and discloses an amorphous photonic crystal structure-color material with a photocatalytic effect and a preparation method thereof. The method comprises the following steps: preparing a monodisperse silicon dioxide microsphere emulsion by adopting an improved method, and modifying the surfaces of silicon dioxidemicrospheres with ammonia water; and then, preparing SiO2@TiO2 nano microspheres with uniform particle sizes by adopting a mixed solvent method, and carrying out heat treatment under argon to obtainthe amorphous photonic crystal structure-color material with a photocatalysis function. Through introduction of oxygen defects, the nano microspheres can exhibit the characteristics that the amorphousdisordered photonic crystal structure color is high in saturation and does not fade. The shell layer formed by TiO2 nanocrystalline has high electron-hole separation rate, and the photocatalysis function is improved. The non-angle-dependent amorphous photonic crystal structure-color material with the photocatalytic property can replace conventional pigment in use, has double functions of degrading pollutants, and has a great application prospect in environment protection development in pigment industry.

Description

technical field [0001] The invention belongs to the technical field of preparation of structural color materials, and relates to an amorphous photonic crystal structural color material with photocatalytic effect and a preparation method thereof. Background technique [0002] Structural color originates from the scattering, diffraction and interference of light caused by the interaction between the microscopic nanostructure of materials and light of specific wavelengths. Both photonic crystal and amorphous photonic crystal structures can produce different shades of structural color. Photonic crystals are the arrangement and combination of periodic dielectric structures with photonic band gaps. The appearance of structural colors is caused by Bragg diffraction and scattering of photons in the band gap region of visible light. Adjusting the dielectric constant can adjust the color and color of structural colors. chroma. The structural unit of the generally prepared photonic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J35/08
CPCB01J21/08B01J35/396B01J35/51B01J35/39
Inventor 秦毅冯篱王芬赵婷朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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