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Rutile vanadium dioxide nanometer powder, and preparation method and application thereof

A technology of vanadium dioxide nanometer and rutile phase, which is applied in the fields of vanadium oxide, nanotechnology, nanotechnology, etc., can solve the problem of single shape of vanadium dioxide nanometer powder of rutile phase, and achieve simple and convenient preparation method , excellent performance

Active Publication Date: 2014-07-23
江苏先进无机材料研究院
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The present invention aims at the technical problem that the rutile phase vanadium dioxide nano-powder in the prior art has a single shape and is limited to being approximately equal to the ratio of the three-dimensional maximum size to the minimum size, and the purpose is to provide a new rutile phase Vanadium dioxide nano powder

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  • Rutile vanadium dioxide nanometer powder, and preparation method and application thereof
  • Rutile vanadium dioxide nanometer powder, and preparation method and application thereof
  • Rutile vanadium dioxide nanometer powder, and preparation method and application thereof

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Embodiment 1

[0045] Step A) Weigh 1.0 g of vanadium pentoxide and 1.8 g of oxalic acid dihydrate, stir in 40 mL of deionized water until completely dissolved to obtain a tetravalent vanadium ion precursor solution. Dilute this precursor solution with deionized water to 160mL, take out 40mL of it and put it into a 100mL hydrothermal kettle, react at 180°C for 24 hours, and obtain the vanadium dioxide precursor after the reaction solution is centrifuged and dried.

[0046] Step B) Weigh 0.4 g of the vanadium dioxide precursor obtained above, put it into 50 mL of a solution of deionized water and absolute ethanol with a weight percentage of 1:4, and after ultrasonic dispersion for 30 minutes, use ammonia water to adjust the pH to 11, and 70 μL of ethyl orthosilicate was slowly added, stirred for 4 hours, filtered, washed, and dried at 110° C. for 2 hours to obtain a silicon oxide-wrapped vanadium dioxide precursor.

[0047] Step C) Weighing a small amount of the above-mentioned vanadium dioxi...

Embodiment 2

[0057] Step A) take by weighing 1.0g vanadium pentoxide and a certain amount of WO 3 (W:V=1at%), measure 40mL deionized water, stir and add 0.1mL hydrogen peroxide to obtain an orange-red liquid, then add an appropriate amount of oxalic acid dihydrate until a blue-green solution is obtained; transfer this liquid into a hydrothermal reaction kettle and Sealed and kept at 180°C for 6 hours to obtain a strip-shaped B-phase vanadium dioxide precursor, which was observed by SEM with a length of about 4-6 μm, a width of about 50-100 nm, a thickness of 10-30 nm, and a length-thickness ratio of about It is 133~600.

[0058] Step B) Weigh 0.4 g of the above-mentioned precursor, and wrap it with silicon oxide in the same way as in Example 1 to obtain a silicon oxide-wrapped vanadium dioxide precursor with a ribbon structure.

[0059] Step C) raising the temperature of the obtained silicon oxide-wrapped vanadium dioxide precursor to 800° C. under vacuum or an inert atmosphere, keeping t...

Embodiment 3

[0062] Step A) Weigh 1.2g of vanadyl acetylacetonate, measure 20mL of deionized water and 20mL of methanol, stir slightly to obtain a suspension, transfer it to a 100mL hydrothermal kettle and react at 180°C for 48 hours, and the reaction product After centrifugation and collection, a blue-black powder was obtained, which was washed and dried for later use. Observation by SEM shows short-flaky B-phase vanadium dioxide precursors with similar length and width. The length is about 500-800nm, the width is about 300-500nm, the thickness is 30-50nm, and the length-thickness ratio is about 10-25.

[0063] Step B) Weigh 0.2 g of the above-mentioned precursor, and wrap it with silicon oxide in the same way as in Example 1 to obtain a silicon oxide-wrapped vanadium dioxide precursor with an equirectangular sheet structure.

[0064] Step C) raising the temperature of the obtained vanadium dioxide precursor wrapped in silicon oxide to 700° C. under vacuum or an inert atmosphere, keeping ...

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Abstract

The invention discloses a preparation method and application of a rutile vanadium dioxide nanometer powder. The external of the powder is coated with an inert oxide, the ratio of the three-dimensional maximum size to the three-dimensional minimum size of the nanometer powder is no less than 5, and the three-dimensional minimum size is no more than 200 nm. The preparation method of the nanometer powder comprises: firstly synthesizing a B-phase vanadium dioxide precursor; coating the B-phase vanadium dioxide precursor to form a B-phase vanadium dioxide precursor coated by an inert oxide; and recovering the B-phase vanadium dioxide precursor coated with the inert oxide and performing heat treatment, so as to obtain the rutile vanadium dioxide nanometer powder coated with the inert oxide and possessing nanometer empty pores. The obtained nanometer powder is in the shape of a thin sheet or a long rod, and is good in dispersibility, high in stability and excellent in thermochromic performance. The preparation method is simple, low in cost, high in yield and suitable for large-scale production. The nanometer powder is widely applicable as energy-saving paint, energy-saving pasting films and energy-saving glass of buildings and automobiles.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, and in particular relates to a rutile phase vanadium dioxide and a preparation method thereof. Background technique [0002] Due to the increasingly scarce global energy resources and the deterioration of the environment caused by excessive carbon emissions, energy conservation and emission reduction has become the top priority of all countries. It is estimated that more than 1 / 3 of the total energy consumption of the society is building energy consumption, energy conservation and emission reduction is imperative, and energy conservation and emission reduction must give priority to building energy conservation. Since a large part of building energy consumption is used for air conditioning, more than half of the air conditioning energy is lost through the heat exchange between windows and the outside world. Therefore, the development of new smart energy-saving windows can effectively r...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y30/00C09J7/00
Inventor 金平实李荣罗宏杰周奕杰
Owner 江苏先进无机材料研究院
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