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
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[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...
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[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.
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[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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