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Method for producing photochromic composite film and the product thereby

A composite film, visible light technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, devices for coating liquids on the surface, etc. Effect

Inactive Publication Date: 2005-01-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In 1992, Yao Jiannian et al. reported on Nature, 1992, 355, 624, the visible light discoloration effect of molybdenum trioxide thin film by using photoelectrochemical combination method, but due to its complicated operation steps, it is difficult to be practical
[0004] Subsequently, some scientists in the world carried out some research work accordingly. In 1996, C. Bechinger et al. reported the visible light photochromism of films prepared with CdS composite WO3 on Appl. Phys. Let., 1996, 20, 2834 , but its preparation method is relatively complicated, requires special equipment, and there is a phenomenon of photocorrosion
[0005] In 2002, Japanese scientists reported V in Chem Mater, 2002, 14, 3730 2 o 5 Visible light photochromic effect, but the light source they use is a laser light source, and the irradiation time is very long, so its practicability is poor
[0006] In terms of inorganic / organic composite photochromic materials, American scientists reported materials using organic photochromic molecules and inorganic carriers in J.Mater.Sci.Let., 1997, 16, 435, but its photochromic Under the irradiation of ultraviolet light

Method used

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  • Method for producing photochromic composite film and the product thereby
  • Method for producing photochromic composite film and the product thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Concentration is 5% PVP (produced by U.S. Aldrich company, number average molecular weight is 100000, purity 99%) aqueous solution is mixed with 2% molybdic acid aqueous solution, mixing ratio is 1: 10, under 15 ℃, stir 2 hours, will prepare The obtained sol was prepared into a thin film by casting method. The film has good visible photochromic performance, and the film changes from light yellow to blue when irradiated with visible light (λ > 420nm) for 30 minutes, and the change in the ultraviolet-visible spectrum at 780nm reaches 0.1.

Embodiment 2

[0023] Concentration is 10% PVA (produced by U.S. Aldrich company, number-average molecular weight is 100000, purity 99%) aqueous solution is mixed with 10% phosphomolybdic acid aqueous solution, mixing ratio is 1: 5, stirs 5 hours under 20 ℃, will prepare The obtained sol was prepared into a thin film by casting method. The prepared film has good photochromic properties of visible light. When irradiated with visible light (λ>420nm) for 60 minutes, the film changes from light yellow to light blue, and its absorption change at 780nm on the ultraviolet-visible spectrum can reach 0.3, such as figure 1 shown.

Embodiment 3

[0025] A 15% concentration of PAM (produced by Aldrich, USA, with a number average molecular weight of 100,000 and a purity of 99%) was mixed with a 13% aqueous solution of sodium molybdate in a mixing ratio of 5:1, stirred at 30°C for 8 hours, and the obtained The sol is prepared into a thin film by spin coating, and the film has good photochromic properties of visible light. When irradiated with visible light (λ>420nm) for 60 minutes, the film changes from light yellow to light blue. The absorption change at 780nm on the spectrum can reach 0.1, such as figure 2 shown.

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Abstract

The invention discloses a method for producing photochromic composite film which comprises, mixing the inorganic aqueous solution with organic molecular solution and agitating, forming films on clean substrates with the obtained sol by means of casting method or rotary coating method, the inorganic substance is molybdic acid, sodium molybdate, amine molybdate, phosphomolybdic acid or silicomolybdic acid, the organic molecule is N-methyl pyrrolidone, tetramethylurea, polyvinyl pyrrolidon, polyacrylamide, polyacrylic acid, or polyvinyl alcohol.

Description

technical field [0001] The invention relates to a method for preparing a composite film with photochromic effect, and also relates to a product prepared by the method. Background technique [0002] Photochromic materials refer to materials that can change from one color to another under the irradiation of light within a certain wavelength range, and at the same time return to the original state under the action of light or heat of another wavelength. In recent years, due to the potential application of this material in many high-tech fields such as ultra-high density optical information storage, display materials and new photosensitive materials, it has attracted more and more attention. Inorganic photochromic materials, mainly transition metal oxides such as tungsten trioxide, molybdenum trioxide and heteropolyacids, have attracted attention due to their good heat resistance and stability. However, these substances can only undergo photochromic reactions under the irradiat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/30C09K9/00
Inventor 姚建年张光晋
Owner INST OF CHEM CHINESE ACAD OF SCI
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