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Acidic tungsten sol, and preparation method and application thereof

A tungsten sol and acidic technology, which is applied in the field of material chemistry, can solve the problems of weakening solar radiation regulation efficiency, lowering the phase transition temperature of vanadium dioxide, and demanding storage conditions, so as to overcome harsh storage conditions, low cost, and ideal regulation rate Effect

Inactive Publication Date: 2012-10-31
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, doping tungsten vanadium dioxide also has some problems: for example, (1) the ability to reduce the phase transition temperature of vanadium dioxide by doping tungsten is not stable, and the results of different preparation systems are very different, for example, it can be changed from -5 ℃ / 1wt%t to -28℃ / 1wt% change
(2) Most gas phase preparation methods use WCl 6 , metal tungsten or tungsten alkoxide as raw materials, these raw materials are not only expensive, but also extremely unstable, requiring harsh storage conditions
However, due to the limitation of its own optical properties, after doping with tungsten, the visible light transmittance of vanadium dioxide film will often decrease, and the regulation efficiency of solar radiation will also be greatly weakened, which is not conducive to energy-saving applications.

Method used

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  • Acidic tungsten sol, and preparation method and application thereof
  • Acidic tungsten sol, and preparation method and application thereof
  • Acidic tungsten sol, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In 25ml of deionized water, add 0.051g of ammonium tungstate, at this time the ammonium tungstate does not dissolve and forms a suspension. Heat the suspension to 20°C, then add 0.5 mol / L hydrochloric acid drop by drop until the pH of the solution is 3.0, at which point all the ammonium tungstate dissolves. After the solution was cooled naturally, it was fixed in a 50ml volumetric flask with deionized water, and the cooled object was measured, showing obvious Tyndall effect, that is, an acidic tungsten sol with a tungsten element concentration of 0.004mol / L was obtained.

Embodiment 2

[0037] In 50ml of deionized water, add 2.55g of ammonium tungstate, at this time the ammonium tungstate does not dissolve and forms a suspension. Heat the solution to 40°C, then add 0.5mol / L hydrochloric acid dropwise until the pH of the solution is 2.0, at which time all the ammonium tungstate dissolves. After the solution was cooled naturally, it was fixed in a 100ml volumetric flask with deionized water, and the cooled object was measured, which showed obvious Tyndall effect, that is, an acidic tungsten sol with a tungsten element concentration of 0.1mol / L was obtained.

Embodiment 3

[0039] In 70ml of deionized water, add 25.5g of ammonium tungstate, at this time the ammonium tungstate does not dissolve and forms a suspension. Heat the suspension to 60°C, then add 0.5mol / L hydrochloric acid drop by drop until the pH of the solution is 1.4, at which point all the ammonium tungstate dissolves. After the solution was cooled naturally, it was fixed in a 100ml volumetric flask with deionized water, and the cooled object was measured, which showed obvious Tyndall effect, that is, an acidic tungsten-doped sol with a tungsten element concentration of 1mol / L was obtained.

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Abstract

The invention relates to acidic tungsten sol, and a preparation method and application thereof. The acidic tungsten sol consists of ammonium tungstate, a pH regulator and water, wherein the pH value of the acidic tungsten sol is less than 5; and the tungsten content is less than 0.001 to 2 mol / L. The acidic tungsten sol is added into precursor solution containing vanadium ions to form coating liquid, wherein the molar ratio of the tungsten to the vanadium ions ranges from (0.001 : 1) to (0.05 : 1); and the formed coating liquid can be used for preparing a vanadium dioxide film. The acidic tungsten sol can stably exist in the acidic environment. The tungsten doped vanadium dioxide film prepared by using the acidic tungsten sol as a tungsten doping agent has high transmissivity on visible light and has strong adjusting capacity on solar radiation energy.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to an acidic tungsten sol and a preparation method thereof. The invention also relates to the application of the acidic tungsten sol in preparing tungsten-doped vanadium dioxide film. Background technique [0002] Since entering the 21st century, energy crisis and environmental issues have become two major obstacles to the sustainable development of society. The large-scale exploitation and utilization of fossil fuels (oil, natural gas, coal, etc.) not only consumes the limited resources of the earth, but also emits a large amount of greenhouse gases (CO 2 , NO) have also brought a series of environmental problems, such as the deterioration of the human living environment and the sharp rise of the global average temperature. According to the statistics of the UN Climate Committee (IPCC), if effective measures are not taken, the global average temperature will rise by more than 3°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02C09K9/00C03C17/22
Inventor 高彦峰杜靖罗宏杰金平实
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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