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A kind of vanadium dioxide nanoparticles coated with nano-alumina and preparation method thereof

A technology of vanadium dioxide nanometer and nano-alumina, which is applied in the direction of vanadium oxide, nanotechnology, nanotechnology, etc., can solve the problems of poor stability of vanadium dioxide powder, and achieve the goal of maintaining optical properties, improving stability, and simple process Effect

Inactive Publication Date: 2018-02-23
佛山金智节能膜有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a vanadium dioxide nanoparticle coated with nano-alumina and a preparation method thereof, which solves the problem of poor stability of the vanadium dioxide powder in the prior art

Method used

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  • A kind of vanadium dioxide nanoparticles coated with nano-alumina and preparation method thereof
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  • A kind of vanadium dioxide nanoparticles coated with nano-alumina and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1. Dissolve 18.75g aluminum nitrate in 20g pure water to prepare a solution;

[0039] Step 2: Take 50g of pure water and 1.5g of nano vanadium dioxide powder, add 30% of the powder content of a dispersant, stir and ultrasonically disperse for 30 minutes to prepare a nano vanadium dioxide dispersion;

[0040] Step 3: Heat 63g of ammonia water with an effective content of 25%-28% to 85°C;

[0041] Step 4. Slowly add 38.75g of the solution of step 1 to the ammonia water of step 3, stirring vigorously while dripping; 1 hour later, add 1.35g of hydrochloric acid as a peptizing agent, and add 50g of step 2 after the boehmite sol is formed. Vanadium oxide dispersion, continue to stir at medium speed for 15 minutes;

[0042] Step 5. Put the obtained solution into the high temperature and high pressure reaction kettle, evacuate, fill with nitrogen to remove the air in the kettle, adjust the reaction temperature to 240°C, and continue the high temperature reaction for 12 hours;

[00...

Embodiment 2

[0045] Step 1. Dissolve 12.1g aluminum chloride in 20g pure water to prepare a solution;

[0046] Step 2: Take 50g of pure water and 1.5g of nano vanadium dioxide powder, add 30% of the powder content of a dispersant, stir and ultrasonically disperse for 30 minutes to prepare a nano vanadium dioxide dispersion;

[0047] Step 3: Heat another 63g of ammonia water with an effective content of 25%-28% to 85°C;

[0048] Step 4. Slowly add 32.1g of the solution of step 1 to the ammonia water of step 3, stirring vigorously while dripping; 1 hour later, add 1.35g of nitric acid as a peptizer, and add 50g of the second step of step 2 after the boehmite sol is formed. Vanadium oxide dispersion, continue to stir at medium speed for 15 minutes;

[0049] Step 5. Put the obtained solution into the high temperature and high pressure reaction kettle, evacuate, fill with nitrogen to remove the air in the kettle, adjust the reaction temperature to 240°C, and continue the high temperature reaction for 1...

Embodiment 3

[0052] Step 1. Dissolve 18.75g aluminum nitrate in 20g pure water to prepare a solution;

[0053] Step 2: Take 50g of pure water and 1.5g of nano vanadium dioxide powder, add 30% of the powder content of a dispersant, stir and ultrasonically disperse for 30 minutes to prepare a nano vanadium dioxide dispersion;

[0054] Step three, heating 60g sodium hydroxide (10% sodium hydroxide) to 85°C;

[0055] Step 4. Slowly add 38.75g of the solution of step 1 to the sodium hydroxide solution of step 3, stirring vigorously while dripping; 1 hour later, add 1.35g of hydrochloric acid as a peptizer, and add 50g of step after the boehmite sol is formed Second vanadium dioxide dispersion, continue to stir at medium speed for 15 minutes;

[0056] Step 5. Put the obtained solution into the high temperature and high pressure reaction kettle, evacuate, fill with nitrogen to remove the air in the kettle, adjust the reaction temperature to 240°C, and continue the high temperature reaction for 12 hours; ...

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Abstract

The invention brings forward nano-alumina-coated vanadium dioxide nanoparticle, which comprises a rutile nano-vanadium dioxide core and an alumina shell which coats the rutile nano-vanadium dioxide core. The invention also brings forward a preparation method of the nano-alumina-coated vanadium dioxide nanoparticle. According to the nano-alumina-coated vanadium dioxide nanoparticle, stability of vanadium dioxide can be raised, and overall visible light permeability of vanadium dioxide particles is not influenced. The product is stable vanadium dioxide particles capable of maintaining excellent optical performance and thermochromism. The preparation method of the nano-alumina-coated vanadium dioxide nanoparticle has simple process, is simple to operate, and is green and environmentally friendly. According to the preparation method of the nano-alumina-coated vanadium dioxide nanoparticle, a PVA solution is added such that agglomeration of colloid particles can be prevented effectively. The preparation method of the nano-alumina-coated vanadium dioxide nanoparticle has advantages of good coating effect and uniform coating.

Description

Technical field [0001] The invention relates to a nano material and a preparation method thereof, in particular to a vanadium dioxide nano particle coated with nano alumina and a preparation method thereof, which can be used for energy saving in buildings and automobiles. Background technique [0002] The total area of ​​public buildings in my country is about 4.5 billion square meters, 99% of which are energy-efficient buildings. With the improvement of people's living standards, cars have gradually become a means of transportation for people to travel, and the demand for automotive membranes is also increasing. At a time when global energy is becoming more and more tense, in order to alleviate the energy pressure caused by economic development, the country has comprehensively promoted energy-saving building materials, and has increased the boom in real estate development. Therefore, functional glass films are increasingly being widely promoted and applied, especially with unique...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y30/00
CPCC01G31/02C01P2004/51C01P2004/64C01P2004/84C01P2006/90
Inventor 陆冠彬王红兵李永鸿吴耀根
Owner 佛山金智节能膜有限公司