Method for preparing photochromic WO3 film using malic acid induction

A photochromic and malic acid technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of lack of clear characterization of the color changing effect, demanding photochromic excitation light source, etc., achieve good color changing effect and improve photochromic reaction Activity, effect of inhibiting aggregation

Inactive Publication Date: 2009-03-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gasochromic device has more market potential due to its simple structure and wide optical adjustment range, so it has become one of the hotspots in the application research of tungsten oxide thin film chromogenic materials in the near future, but the results of photochromism are rarely reported. In the few photochromic research reports, there are deficiencies in that the photochromic excitation light source is demanding and the color changing effect is lack of clear characterization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, prepare 0.2mol / L Na 2 WO 4 Solution 25ml, Na 2 WO 4 After the solution passes through the cation exchange resin, adjust the pH value to 1.0 with concentrated hydrochloric acid with a concentration of 36% by mass percent, and add 10 ml of n-propanol and 15 ml of polyacrylic acid dropwise under the magnetic stirrer at a speed of 400 r / min, and then dropwise Add 25ml of 3mol / L inducer malic acid solution, then stir and homogenize the reaction system for 4 hours, then put it in a dark place and let it stand for 24h, then use the dipping and pulling method (the pulling speed is 20mm / s, the coating time is 120s ) and dried at 50°C. Finally, put the coated glass slide into a vacuum drying oven and keep it warm for 1 hour under the conditions of a vacuum degree of 0.085 and a temperature of 150°C to obtain the photochromic WO 3 film. Utilize SC-80C full-automatic color difference meter (Beijing Kang Guang Instrument Co., Ltd.) to measure film chromaticity to be 12.4...

Embodiment 2

[0019] The amount of the malic acid solution added in this embodiment is 0.5 times of the amount used in Example 1, that is, 12.5ml of malic acid solution is added, and other conditions are the same as in Example 1 to prepare photochromic WO 3 The measured chromaticity value of the film is 12.45. After being irradiated with ultraviolet light for 5 hours, its chromaticity value is 13.30. After being moved into a dark place for 2 hours, it fades, and its chromaticity value is 12.44.

Embodiment 3

[0021] Get the photochromic WO that embodiment 1 makes 3 The photochromic performance of the film sample was tested between 12:00 and 14:00 on a sunny summer day in southern China. The chromaticity value was 13.15 after 2 hours of light, and faded after 2 hours in the dark, and the chromaticity value was 12.45.

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PUM

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Abstract

The invention discloses a method for preparing a photochromism WO3 film, in particular to a method for preparing the photochromism WO3 film by the action of revulsant-malic acid. The method includes the following steps: a tungstate solution is prepared; tungstenic acid is synthesized after ion exchange; the pH value of the system is adjusted; a stabilizer and a film-forming agent are added; the revulsant is added; metallic-membrane plating and drying are carried out; finally, heat treatment is carried out. The method is simple and the prepared WO3 film can yield a good color changing effect under the condition of excitation light source with low power. Meanwhile, the WO3 film can fade without light, thereby realizing that the revulsant-malic acid is used for preparing the WO3 film with good photochromism performance.

Description

technical field [0001] The invention relates to a method for preparing photochromic WO 3 Thin film method, especially preparation of photochromic WO under the action of inducer malic acid 3 thin film method. Background technique [0002] Under the action of an external excitation source, the phenomenon that a substance or a system undergoes a significant change in color is called discoloration. Photochromism means that when a compound A is irradiated by light of a certain wavelength, a photochemical reaction can occur to obtain a product B, and the colors of A and B (that is, the absorption of light) are obviously different. B can be restored to its original form A under the irradiation of another beam of light or by heating. Photochromic materials were reported as early as 1867. In the following 20 years, scientists began to gradually enter the field of research, but it was not until 1956 that Hirshberg proposed the possibility of photochromic materials being applied to ...

Claims

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Application Information

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IPC IPC(8): C01G41/02
Inventor 沈毅颜莎宁黄荣朱华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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