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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 the problems that have not been reported yet, and achieve the effect of easy operating conditions, good photochromic performance, and operating conditions.

Inactive Publication Date: 2011-04-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 has not been reported yet, in order to expand the MoO 3 application range of photochromic materials, it is necessary for pure MoO 3 Research on photochromic nanopowder

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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Effect test

Embodiment 1

[0024] First, using sodium molybdate as molybdenum source, prepare 1mol / L Na 2 MoO 4 solution 50ml, and under the action of a magnetic stirrer, HCl was added dropwise to adjust the pH value of the solution to 1.0. Secondly, the obtained reaction system was stirred and homogenized for 4 hours, then transferred into a hydrothermal kettle, and subjected to a hydrothermal reaction at 120° C. for 48 hours. Afterwards, collect and wash the product powder: wash the reaction product repeatedly with distilled water until the pH of the supernatant is between 6.5 and 7.5, and then wash it with absolute ethanol to remove residual water-soluble impurities. Finally, put the reacted powder into a vacuum drying oven to dry for 1 h under the conditions of a vacuum degree of 0.085 and a temperature of 50°C. Utilize the SC-80C automatic colorimeter (Beijing Kangguang Instrument Co., Ltd.) to measure the powder with an ultraviolet lamp (Z-F-20C dark box type ultraviolet analyzer (Shanghai Baosh...

Embodiment 2

[0027] Different from Example 1, the pH value of the adjustment reaction system is 0.5, and other conditions are the same, the prepared MoO 3 The change of the color difference value of the nano-powder before and after being irradiated with ultraviolet light for 5 minutes is 21.2721, and the powder turns blue. The color fades after 1.5 days in a dark place.

Embodiment 3

[0029] Different from Example 1, it means that the prepared MoO 3 The nano-powder sample was tested for its photochromic performance between 12:00 noon and 14:00 on a sunny summer day in southern China. The change in chromaticity value before and after 5 minutes of light was 15.3812, and it faded after being moved into 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] Color 1 Color 2 [0005] 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 tetra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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