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Preparation method of MoO3 nanorod powder with sensitive photochromic property

A photochromic and nanorod technology, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of complex powder preparation methods, weak photochromic ability, poor dispersion, etc., to achieve photochromic The effect of high reaction sensitivity, large specific surface area, and simple preparation method

Inactive Publication Date: 2009-09-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In photochromic MoO 3 In the research report of nanopowder, the powder preparation method is relatively complicated, and the prepared MoO 3 The powder particles are large and the dispersibility is not good, and the photochromic ability is also weak. Generally, it needs to be photochromic under the irradiation of a high-pressure mercury lamp (350W).

Method used

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  • Preparation method of MoO3 nanorod powder with sensitive photochromic property
  • Preparation method of MoO3 nanorod powder with sensitive photochromic property

Examples

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Effect test

Embodiment 1

[0024] Na 2 MoO 4 Soluble in water, made into Na with a concentration of 1mol / L 2 MoO 4 Solution 50ml, pass it through cation exchange resin to obtain molybdic acid solution, under the condition of stirring speed 500r / min, drop concentration is 38% hydrochloric acid to adjust system pH value to 0.8, then drop concentration is 9.5% inducer 8ml of oxalic acid solution (the volume ratio of molybdic acid solution to oxalic acid solution is 1:0.16). The above system was stirred and homogenized for 4 hours, and then put into a 100ml hydrothermal kettle lined with polytetrafluoroethylene for hydrothermal reaction at 120°C for 60 hours. The reaction product is repeatedly washed with water to remove water-soluble impurities therein until the pH value of the clear liquid is between 6.5 and 7.5, and then cleaned with absolute ethanol.

[0025] Put the cleaned powder into a vacuum drying oven, and dry for 2 hours under the conditions of a vacuum degree of 0.085 and a temperature of 60...

Embodiment 2

[0034]Adopt the method identical with embodiment 1, difference is to adopt the K that concentration is 0.05mol / L 2 MoO 4 The solution is passed through a cation exchange resin to obtain a molybdic acid solution, and the pH value of the molybdic acid solution is adjusted to 0.1 with 25% hydrochloric acid under the condition that the stirring speed is 600 r / min. The concentration of the oxalic acid solution used is 8%, the dropwise amount is 2ml, the volume ratio of the molybdenum acid solution and the oxalic acid solution is 1:0.04, and the stirring homogenization time is 2h. Reaction in a hydrothermal kettle at 160°C for 48h. The vacuum degree used for vacuum drying is 0.05, the temperature is 50°C, and the time is 3h, to obtain MoO 3 nanorod powder.

[0035] Obtained MoO 3 The chromaticity of the nanorod powder was 3.067, and after 20 minutes of irradiation with the ultraviolet lamp, the powder turned blue, and the measured chromaticity value was 3.103. After moving into...

Embodiment 3

[0037] Adopt the method identical with embodiment 1, difference is to adopt the Li that concentration is 3.5mol / L 2 MoO 4 The solution was passed through the zeolite to obtain a molybdic acid solution, and the pH value of the molybdic acid solution was adjusted to 2.0 with 25% hydrochloric acid under the condition that the stirring speed was 400 r / min. The concentration of the oxalic acid solution used is 15%, the dropwise amount is 10ml, the volume ratio of the molybdenum acid solution to the oxalic acid solution is 1:0.2, and the stirring homogenization time is 6h. In a hydrothermal kettle at 80 ° C for 96h. The degree of vacuum used is 0.1, the temperature is 80°C, and the drying time is 1h to obtain MoO 3 nanorod powder.

[0038] The chromaticity of the obtained powder was 3.067, and after 20 minutes of ultraviolet light irradiation, the powder turned blue, and the measured chromaticity value was 3.103. After moving into a dark place for 3 hours, the color fades, and i...

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Abstract

The invention discloses a preparation method of MoO3 nanorod powder with sensitive photochromic property, comprising steps of preparing 0.05-3.5mol / L of molybdate water solution into molybdic acid water solution by ion-exchange method, and then adjusting pH value to 0.1-2.0 with hydrochloric acid; adding oxalic acid solution with mass percent concentration of 8-15% into the molybdic acid water solution while stirring, wherein volume ratio between the molybdic acid water solution and the oxalic acid solution is 1:0.04-0.20, then stirring and homogenizing; hydrothermally reacting the homogenized mixture for 1-4 days at 80-160 DEG C, then cleaning the reaction product and drying at 50-80 DEG C to obtain MoO3 nanorod powder. The MoO3 nanorod powder prepared by the method has larger specific surface, better dispersity, and high photochromic reaction sensitivity, can have photochromism under radiation of sunlight or low-power ultraviolet lamps and can fade without light at normal state.

Description

technical field [0001] The present invention relates to a MoO with sensitive photochromic properties 3 The preparation method of nanorod powder, especially relates to a kind of preparation MoO with oxalic acid as inducer 3 Method for Nanorod Powders. Background technique [0002] Photochromism means that a compound (A) can undergo a specific chemical reaction to obtain a product (B) when it is irradiated by light of a certain wavelength, and its absorption spectrum changes significantly due to structural changes. Under the action of another wavelength of light or heat, it can return to the original form (A), and this change is reversible. It has been more than 100 years since human beings discovered the phenomenon of photochromism. In 1867, Fischer observed the fading phenomenon of yellow tetracene under the action of air and light, and the resulting substance regenerated tetracene after being heated. In 1899, Markwald studied the reversible color change behavior of 1,4-...

Claims

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Application Information

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IPC IPC(8): C01G39/02B82B3/00C09K9/00
Inventor 沈毅曹元媛黄荣闫敏艳李珍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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