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Photochromic WO3 film with hollow microsphere as micro-morphology and preparation method thereof

A photochromic and microscopic morphology technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, tungsten oxide/tungsten hydroxide, etc., to achieve the effect of enhancing surface energy, improving photochromic reaction activity, and improving utilization rate

Inactive Publication Date: 2009-04-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But how to prepare WO with microscopic morphology as hollow microspheres 3 Thin films, optimizing their photochromic properties, are still unreported

Method used

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  • Photochromic WO3 film with hollow microsphere as micro-morphology and preparation method thereof
  • Photochromic WO3 film with hollow microsphere as micro-morphology and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, prepare 0.2mol / L Na 2 WO 4 Solution 25ml, Na 2 WO 4 After the solution passes through the cation exchange resin, use 37% concentrated hydrochloric acid to adjust the pH value to 1.0, and then add 10ml of n-propanol and 25ml of 3mol / L oxalic acid solution dropwise under the magnetic stirrer at a speed of 400r / min, and then add 15ml of polyacrylic acid, then the reaction system was stirred and homogenized for 4 hours, then placed in the dark for 24 hours, and then coated with dipping and pulling method (pulling speed: 20mm / s, coating time: 120s) and dried at 50°C. Finally, put the coated glass slide into a resistance furnace and sinter at 200°C for 1h and 300°C for 1h to obtain photochromic WO 3 film. Utilize SC-80C automatic color difference meter (Beijing Kangguang Instrument Co., Ltd.) to measure film chromaticity to be 21.87; 3 Thin film is put into Z-F-20C dark box type ultraviolet analyzer (manufactured by Shanghai Baoshan Gucun Electro-optical Instrumen...

Embodiment 2

[0024] The difference from Example 1 is that the amount of polyacrylic acid added is 0.5 times that of Example 1, and other conditions are the same as in Example 1. The chromaticity value of the prepared film is 20.45. After 5 hours of ultraviolet light irradiation, its chromaticity The value is 22.30, and it fades after moving into a dark place for 2 hours, and its chromaticity value is 20.34.

Embodiment 3

[0026] Get the WO that embodiment 1 prepares 3 The photochromic performance of the film sample was tested between 12:00 noon and 14:00 on a sunny summer day in southern China. The chromaticity value was 23.15 after 2 hours of light, and faded after 2 hours in the dark, and the chromaticity value was 20.23.

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Abstract

The invention discloses a photochromic WO3 film with the microcosmic appearance of censphere and a preparation method thereof, wherein the method comprises the following steps of: (1) confecting 0.05-3mol / L of tungstate solution; (2) preparing tungstenic acid solution by the tungstate solution through cation exchange resin; (3) regulating the pH value to 0.8-2.0 by the concentrated hydrochloric acid with 37-38 percent of weight percent concentration; (4) adding a dispersant and a stabilizer based on 1.0: 0.1-2.0: 0.1-1.0 volume ratio of the tungstate solution, the disperant and the stabilizer; (5) adding a nucleating agent based on 1.0: 0.1-1.0 volume ratio of the tungstate solution and the nucleating agent; (6) film coating and drying; and (7) carrying out thermal treatment to obtain the WO3 film with the microcosmic appearance of censphere. The microcosmic appearance is censphere and the grain diameter is 200-600nm. The prepared WO3 film can generate favorable color changing effect under the condition of low-power excitation light source, thus improving the photochromic performance of the WO3 film.

Description

technical field [0001] The invention relates to a photochromic WO 3 Thin film and preparation method thereof, especially photochromic WO with microscopic appearance as hollow microspheres 3 Thin films and methods for their preparation. Background technique [0002] Coating particles with a shell layer is one of the most convenient and effective means to form hollow microspheres. First, the shell can significantly change the charge, functional groups, and reactivity of the particle surface, thereby enhancing their stability and compatibility. Secondly, the formation of the shell layer can introduce a variety of materials to obtain hybrid and multifunctional particles. Thirdly, the core-shell particles can be used as the precursor of the hollow structure. The layer by layer self-assembly method (Layer by Layer) is one of the main methods to realize the transformation from the core-shell structure to the hollow structure: the core substance of the core-shell-wrapped structu...

Claims

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Application Information

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IPC IPC(8): C01G41/02C09K9/00
Inventor 沈毅颜莎宁曹元媛王萍萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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