A kind of photochromic composite nano-powder and its preparation method and application

A photochromic and nano-powder technology, applied in color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of large particle size, complicated operation, neglecting the performance of molybdenum trioxide, etc. The effect of color changing properties

Active Publication Date: 2019-02-26
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are many methods for preparing molybdenum oxide, and there are many shapes, but there is a common problem: the prepared particles have a large size
However, the above method is complicated to operate, time-consuming and energy-consuming
Moreover, the composite coatings of these morphologies have not studied the photochromic properties
[0010] To sum up, the main reasons for the current lack of research on molybdenum oxide are: 1) After comparing organic and inorganic photochromic materials, many researchers have shifted to organic photochromic materials, while ignoring the use of chemical means to improve three-dimensional photochromic materials. Study on Properties of Molybdenum Oxide
2) Lack of simple and mature technology for compounding molybdenum oxide and titanium oxide
3) Lack of technology for coating this coating into an energy-saving film
Due to the above reasons, there is currently no nanoparticle and energy-saving film with better performance and structure in photochromism.

Method used

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  • A kind of photochromic composite nano-powder and its preparation method and application
  • A kind of photochromic composite nano-powder and its preparation method and application
  • A kind of photochromic composite nano-powder and its preparation method and application

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preparation example Construction

[0030] Regarding the preparation of the precursor solution, specifically, molybdates such as ammonium molybdate or sodium molybdate can be dissolved in an acid solution with a concentration greater than 2mol / L to obtain a molybdic acid solution with a concentration of 0.0083-1.588g / ml. At room temperature, stir The obtained molybdic acid solution is added with a titanium source having the same acid radical as the acid solution, such as titanium tetrachloride or titanium sulfate, to obtain a precursor solution. It is also possible to directly select a molybdenum acid solution with a concentration of 0.0083-1.588g / ml as the molybdenum source. At room temperature, stir the obtained molybdenum acid solution and add a titanium source with the same acid radical as the acid solution, such as titanium tetrachloride or titanium sulfate. Obtain the precursor solution. Regarding the concentration of the acid solution, it is preferably greater than 2 mol / L and less than 3 mol / L, so as to ...

Embodiment 1

[0035] This example describes a method for preparing molybdenum trioxide-coated titanium dioxide nanoparticles, including:

[0036] S1: Add 0.1576g ammonium paramolybdate into 10ml, 2mol / L hydrochloric acid solution to obtain soluble molybdic acid solution;

[0037] S2: Add 1ml of titanium tetrachloride to the soluble molybdic acid solution under stirring at room temperature to obtain a precursor solution;

[0038] S3: adding an appropriate amount of ammonia water dropwise to the precursor solution to make the solution pH>7, and alkalization to obtain a molybdenum-titanium sol;

[0039] S4: In the molybdenum-titanium sol, add 0.5g of hydrogen peroxide for every 1mL of titanium source, put it into a reaction kettle, react at a temperature of 150°C for 6 hours, and obtain a dispersion after the reaction is completed;

[0040] S5: Cool the dispersion to room temperature, wash with deionized water and absolute ethanol in turn, and dry to obtain molybdenum trioxide-coated titanium...

Embodiment 2

[0042] Preparation of pure titanium oxide: refer to the preparation steps of molybdenum trioxide-coated titanium dioxide nanoparticles described in Example 1, step S1 hydrochloric acid solution in Example 1 does not add ammonium paramolybdate, and all the other steps are the same as in Example 1. Prepare pure titanium oxide.

[0043] figure 1 Be the X-ray diffraction (XRD) collection of patterns of the molybdenum trioxide coated titanium dioxide nanoparticles prepared in embodiment 1, figure 2 It is the XRD pattern of the pure titanium oxide prepared in Example 2. Compared figure 1 and figure 2 It can be seen that the characteristic peak of the molybdenum trioxide-coated titanium dioxide nanoparticles prepared in Example 1 is TiO 2 , figure 1 There are no other impurity peaks appearing, indicating that the TiO in molybdenum trioxide-coated titanium dioxide nanoparticles 2 In crystalline state, MoO 3 is indefinite form.

[0044] see image 3 : image 3 It is a trans...

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Abstract

The invention relates to photochromic composite nano powder and a preparation method and application thereof. The photochromic composite nano powder particles are of a core-shell structure, an outer shell is made of molybdenum trioxide, and an inner core is made of titanium dioxide, wherein the titanium dioxide refers to anatase type titanium dioxide nano particles and is in a granular shape. The powder is prepared by means of a simple and fast one-step hydrothermal method, a molybdenum source and a titanium source are mixed and then subjected to a hydrothermal reaction to obtain molybdenum-oxide-coated titanium oxide nano particles; the photochromic composite nano powder can be applied to the field of energy-saving films, energy-saving glass or energy-saving walls. According to the photochromic composite nano powder, the small size of molybdenum oxide can be achieved, and the photochromic composite nano powder is good in dispersibility and stability and high in photochromic property.

Description

technical field [0001] The invention relates to the field of inorganic nano-materials, in particular to a photochromic composite nano-powder and a preparation method thereof. Background technique [0002] It is estimated that building energy consumption generally accounts for one-third of the total energy consumption in society. At the same time, building energy contributes as much as 25% to the world's greenhouse gas emissions, so energy conservation and emission reduction is the top priority of world energy conservation, and energy conservation and emission reduction must give priority to building energy conservation. Data show that 50% of building energy consumption is carried out through glass windows, which are the main channel for light and heat exchange between buildings and the outside world. Therefore, building energy saving is mainly achieved through the development of new intelligent energy-saving windows to reduce energy consumption and greenhouse gas emissions. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00
CPCC09K9/00
Inventor 金平实李宁纪士东
Owner 江苏先进无机材料研究院
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