Method for synthesizing photochromic nano MoO3 powder by hydrothermal method

A technology of causing color change and powder, which is applied in the field of synthesizing MoO3 nano-powder, which can solve problems that have not been reported yet, and achieve the effect of easy operation conditions, easy reaction, and realization of operation conditions

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 currently for MoO 3 Most studies on photochromic properties focus on sols and thin films, and for pure MoO 3 The research on the photochromic properties of powders

Method used

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  • Method for synthesizing photochromic nano MoO3 powder by hydrothermal method
  • Method for synthesizing photochromic nano MoO3 powder by hydrothermal method

Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] First, use sodium molybdate as molybdenum source to prepare 1mol / L Na 2 MoO 4 The solution is 50ml, and HCl is added dropwise under the action of a magnetic stirrer to adjust the pH of the solution to 1.0. Secondly, after stirring and homogenizing the obtained reaction system for 4 hours, it was transferred to a hydrothermal kettle and reacted hydrothermally at 120°C for 48 hours. After that, the product powder is collected and cleaned: the reaction product is repeatedly cleaned with distilled water until the pH of the supernatant is between 6.5 and 7.5, and then cleaned with absolute ethanol to remove residual water-soluble impurities. Finally, put the reacted powder into a vacuum drying oven and dry it for 1 hour under the conditions of a vacuum degree of 0.085 and a temperature of 50°C. Use SC-80C automatic colorimeter (Beijing Kangguang Instrument Co., Ltd.) to measure the UV lamp for powder (ZF-20C dark-box UV analyzer (Shanghai Baoshan Gucun Electro...

Example Embodiment

[0025] Example 2

[0026] The difference from Example 1 is that the pH value of the reaction system is adjusted to 0.5, and other conditions are the same. 3 Before and after the nano powder was irradiated with an ultraviolet lamp for 5 minutes, the change in color difference value was 21.2721, and the powder turned blue. The color fades after being moved into the dark for 1.5 days.

Example Embodiment

[0027] Example 3

[0028] The difference from Example 1 is that the prepared MoO 3 The nano-powder samples were tested for their photochromic properties from 12 to 14 noon on a sunny day in the southern region in summer. The change in chromaticity value before and after 5 minutes of light was 15.3812, and it faded after being moved to a dark place for 2 days.

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Abstract

The invention discloses a method for synthesizing MoO3 nanometer photochromic powder, which comprises the following steps of: (1) confecting molybdate precursor solution; (2) regulating system pH value; (3) transferring into a hydro-thermal reaction kettle to carry out hydro-thermal reaction; and (4) washing and collecting powder. The method uses the hydro-thermal method to synthesize photochromic MoO3 nanometer powder, and the synthesized powder can absorb sunlight or uviol lamp light and the like irradiation light, generate obvious photochromism and can fade under normal nonluminous conditions.

Description

technical field [0001] The present invention relates to a kind of synthetic MoO 3 Nanopowder method, especially the hydrothermal synthesis of MoO with photochromic properties 3 nanopowder method. Background technique [0002] Photochromism refers to the reversible change of a substance between two physical or chemical states, at least one of which is caused by light radiation. The change process can be expressed by the following equation. [0003] [0004] Its basic features are: (1) T 1 ,T 2 Under certain conditions, they can exist stably; (2) T 1 ,T 2 The color parallax of is significantly different; (3)T 1 ,T 2 Changes between are reversible. Photochromism was first discovered in living organisms. It has a history of more than 100 years. In 1867, Fritsche first observed that the yellow tetracene compound faded under the action of air and light, and the resulting substance was regenerated by heating. The phenomenon of yellow tetracene compound. In 1899, Markw...

Claims

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Application Information

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IPC IPC(8): C01G39/02C09K9/00
Inventor 沈毅闫敏艳曹元媛黄荣
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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