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Nano WO3 photochromic powder and preparation method thereof

A photochromic and nano-technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, tungsten oxide/tungsten hydroxide, etc., to achieve the effect of improving photochromic ability, improving dispersibility, and enhancing surface activity

Inactive Publication Date: 2011-06-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although materials scientists are interested in WO 3 Research on photochromic materials already has a WO on smart windows that can modulate light input into buildings 3 related research results of photochromic thin films; however, due to WO 3 Nanostructures, especially the unit size and morphology of powder structures, and their assembled nanostructure powder materials have a great influence on WO 3 Powder research is also underway, since 2004 WO 3 Since the preparation of nanotubes was realized, WO with various structures and morphologies 3 Research on the preparation, physical and chemical properties and applications of particles is extremely active

Method used

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  • Nano WO3 photochromic powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] First, using sodium tungstate as the tungsten source, prepare 1mol / L Na 2 WO 4 Solution 100ml, and 10ml of oxalic acid solution with a concentration of 1.0mol / L was added dropwise under the stirring of a magnetic stirrer at 400-600r / min, and then the pH value of the solution was adjusted to 1.0 by using HCl with a concentration of 37-38% by mass. Then the obtained reaction system was stirred and homogenized for 4 hours, then put into a hydrothermal kettle for hydrothermal reaction at 100° C. for 48 hours, and then the product powder was collected and washed. The reaction product is washed repeatedly with distilled water until the pH value of the clear liquid is between 6.5 and 7.5, and then washed with absolute ethanol to remove residual water-soluble impurities and excess oxalic acid therein. 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 to obtain nano-photochr...

Embodiment 2

[0022] The hydrothermal reaction temperature in the hydrothermal kettle is 80°C, and other conditions are the same as in Example 1 to prepare nano-photochromic WO 3 Powder, the measured chromaticity value of the powder is 3.132. After 20 minutes of ultraviolet light irradiation, the powder turns blue, and its chromaticity value is 55.874. It fades after being moved into a dark place for 1.5 hours, and its chromaticity value is 3.308.

[0023] Example 2

[0024] The nano-WO that embodiment 1 makes 3 The nanophotochromic powder sample was tested for its photochromic performance between 12:00 noon and 14:00 on a sunny summer day in southern China. The chromaticity value was 48.631 after 20 minutes of light, and faded after being moved into a dark place for 2 hours. The chromaticity value was 3.108. .

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Abstract

The invention discloses a nanometer WO3 photochromic powder body and a preparation method thereof, in particular to a nanometer WO3 photochromic powder body with willow-shaped micromorphology under the action of oxalic acid as a revulsant and a preparation method thereof. The nanometer WO3 photochromic powder body is prepared through the following method: preparing tungstate solution, adding the revulsant, adjusting the PH value of solution, carrying out hydrothermal reaction on mixed solution, and washing and collecting the powder body. Steric hindrance effect of an absorption layer of oxalic acid molecules substantially improves the dispersion of the powder body and obviously strengthens the surface activity; compared with WO3 synthesized without adding the revulsant, the prepared powder body strengthens the capability for absorbing excitation light and obviously improves the photochromic capability under the condition of the same excitation light source.

Description

technical field [0001] The invention relates to a photochromic nano WO 3 Powder and preparation method thereof, especially preparation of nano-WO with willow leaf-like microscopic morphology under the action of inducer 3 Photochromic powder and preparation method thereof. Background technique [0002] At present, due to the quantum size effect, small size effect, surface and interface effect, macroscopic quantum tunneling effect and other properties of nanoparticles, nanomaterials have been widely used in mechanics, thermals, acoustics, electromagnetics, optics, etc. At present, the most active field of material science research has attracted the attention of researchers in many fields around the world. Moreover, because the microstructure and morphology of nanomaterials play a decisive role in many properties, controlling the microstructure and morphology of materials and improving the performance of materials has become one of the main directions of material science rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00C01G41/02
Inventor 沈毅朱华闫敏艳王萍萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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