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Polytungstate-hydrotalcite composite photochromic ultrathin film and preparation method thereof

A hydrotalcite and chromogenic technology, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., to achieve the effects of accurate and controllable color-changing intensity, short response time, and improved color-changing efficiency

Inactive Publication Date: 2014-07-02
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on assembling the compound of decatungstic acid and PVA with hydrotalcite to form an ultra-thin film has not been reported so far.

Method used

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  • Polytungstate-hydrotalcite composite photochromic ultrathin film and preparation method thereof
  • Polytungstate-hydrotalcite composite photochromic ultrathin film and preparation method thereof
  • Polytungstate-hydrotalcite composite photochromic ultrathin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of nitrate hydrotalcite precursor by co-precipitation method:

[0025] a. 0.015mol of solid Mg(NO 3 ) 2 ·6H 2 O and 0.0075mol of solid Al(NO 3 ) 3 9H 2 O dissolved in 50mL to remove CO 2 of deionized water;

[0026] b. Dissolve 0.0625mol NaOH in 50mL to remove CO 2 of deionized water;

[0027] c. the alkali solution prepared by step b is placed in a four-necked bottle, 2 Stir vigorously under the condition of air protection, and at the same time, slowly add the salt solution prepared in step a into the four-necked bottle for about 0.5h. After the addition is completed, adjust the pH value to 8 with 5mol / L NaOH solution , 60 ℃ water bath reaction for 24h, with CO removal 2 The deionized hot water was centrifuged and washed to a pH of about 7, and dried at 70°C for 24 hours to obtain a magnesium-aluminum nitrate hydrotalcite precursor;

[0028]2. Take 0.1 g of the above-mentioned nitrate hydrotalcite precursor and stir it in 100 ml of formamide s...

Embodiment 2

[0036] 1. Preparation of nitrate hydrotalcite precursor by ion exchange method:

[0037] a. Add 0.01mol of solid Mg(NO 3 ) 2 ·6H 2 O and 0.005 mol of solid Al(NO 3 ) 3 9H 2 O and 0.06mol urea were dissolved in 50mL of deionized water, and crystallized in a 90ml polytetrafluoroethylene pressure reaction vessel at 100°C for 12 hours, then centrifugally washed with deionized water until the pH was about 7,70 ℃ drying for 12 hours to obtain carbonate hydrotalcite;

[0038] b. Take 0.3g of the above-mentioned carbonate hydrotalcite and solid NaNO 3 63.75g dissolved in 300mL to remove CO 2 After uniformly dispersed in deionized water, add 1mL of concentrated nitric acid and stir at 25°C under a nitrogen atmosphere to carry out ion exchange reaction for 12 hours and then use 2 The deionized hot water was centrifuged and washed to a pH of about 7, and dried at 70°C for 18 hours to obtain a magnesium-aluminum nitrate hydrotalcite precursor;

[0039] 2. Take 0.1g of the above-m...

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Abstract

The invention discloses polytungstate-hydrotalcite composite photochromic ultrathin film and a preparation method thereof and belongs to the technical field of inorganic composite photochromic materials. The preparation method includes the steps of preparing hydrotalcite stripped with formamide solvent; preparing polytungstate-superpolymer complex solution; and alternately assembling processed substrates with positive charge in the two solutions to obtain the polytungstate-hydrotalcite composite photochromic ultrathin film. The polytungstate-hydrotalcite composite photochromic ultrathin film is fine in photochromism, short in response time, fine in reversibility and high in chromic amplitude, and both chromic strength and thickness of the film can be precisely controlled by changing assembly times.

Description

technical field [0001] The invention belongs to the technical field of inorganic composite photochromic materials, and in particular provides a composite photochromic ultrathin film of polytungstic acid and hydrotalcite and a preparation method thereof. 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. Photochromism is a reversible chemical reaction, which is an important criterion for judging. The irreversible reaction that occurs under the action of light can also lead to a change in color, which only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00
Inventor 王心蕊周威李姝静梁海燕
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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