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Preparation method of titanium dioxide aerogel

A titanium dioxide, aerogel technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of aerogels that have not been reported, and achieve the effects of uniform and stable structure, low density, and uniform pore size distribution

Active Publication Date: 2013-05-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But with TiO 2 As the main body, and the addition of surfactants for surface modification of airgel preparation research has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, a kind of preparation method of titanium dioxide airgel, carries out following steps successively:

[0033] 1. Preparation of titanium dioxide gel:

[0034] First make the ingredients:

[0035] The molar ratio of butyl titanate:ethanol:water:surfactant:chelating agent:drying control chemical additive=1:24:6:0.005:1.8:0.6;

[0036] Remarks: The ethanol above refers to the sum of the amount of ethanol used in step 1) and step 2).

[0037] Polyethylene glycol 2000 was selected as surfactant, acetic acid was used as chelating agent, formamide was used as drying control chemical additive, and ethanol solution of ethyl tetrasilicate (volume fraction of ethyl tetrasilicate was 20%) was used as surface modifier. Ethanol is a low surface tension solvent;

[0038] Follow the steps in turn:

[0039] 1) At room temperature, dissolve butyl titanate in part of ethanol (the amount only needs to ensure that butyl titanate is dissolved at least, for example, 1 / 2 of the...

Embodiment 2

[0047] Embodiment 2, a kind of preparation method of titanium dioxide airgel, carries out following steps successively:

[0048] 1. Preparation of titanium dioxide gel:

[0049] First make the ingredients:

[0050]The molar ratio of butyl titanate:ethanol:water:surfactant:chelating agent:drying control chemical additive=1:24:6:0.003:0.5:0.8;

[0051] Remarks: The ethanol above refers to the sum of the amount of ethanol used in step 1) and step 2).

[0052] Select tri-block copolymer F127 as surfactant, acetylacetone as chelating agent, N,N-dimethylformamide as drying control chemical additive, ethanol solution of trimethylchlorosilane (volume fraction of trimethylchlorosilane 10%) as a surface modifier, n-hexane is a low surface tension solvent;

[0053] Follow the steps in turn:

[0054] 1) At room temperature, dissolve butyl titanate in part of ethanol (the amount only needs to ensure that butyl titanate is dissolved at least, for example, 1 / 2 of the total amount of etha...

Embodiment 3

[0062] Embodiment 3, a kind of preparation method of titanium dioxide airgel, carries out following steps successively:

[0063] 1. Preparation of titanium dioxide gel:

[0064] First make the ingredients:

[0065] The molar ratio of butyl titanate:ethanol:water:surfactant:chelating agent:drying control chemical additive=1:24:6; 0.003:1.0:0.5;

[0066] Remarks: The ethanol above refers to the sum of the amount of ethanol used in step 1) and step 2).

[0067] Triblock copolymer P123 is selected as surfactant, citric acid as chelating agent, glycerol as dryness control chemical additive, ethanol solution of methyltrimethoxysilane (volume fraction of methyltrimethoxysilane is 15%) As a surface modifier, isopropanol is a low surface tension solvent;

[0068] Follow the steps in turn:

[0069] 1) At room temperature, dissolve the triblock copolymer P123 in part of ethanol (the amount only needs to be at least enough to ensure the dissolution of butyl titanate, for example, 1 / 2 ...

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Abstract

The invention discloses a preparation method of titanium dioxide aerogel. The method comprises the following steps of: (1) firstly dissolving butyl titanate in ethanol, adding a surface active agent in the mixture, and magnetically stirring the resulting solution to obtain a mixed solution A; (2) dissolving a chelating agent in a mixed solution of the ethanol and water, and uniformly stirring the resulting solution to obtain a mixed solution B; (3) adding the mixed solution B into the mixed solution A, adding a drying control chemical additive in the mixed solution, stirring and standing the resulting solution, to obtain the titanium dioxide gel; (4) orderly aging, soaking and washing the titanium dioxide gel; (5) drying the product obtained in the step 4; and (6) thermally treating the dried product obtained from the step 5 at the temperature of 200-300 DEG C for 3-5 hours to obtain the final titanium dioxide aerogel. By virtue of the method, the titanium dioxide aerogel with a relatively large specific area, relatively low density, and uniform pore size distribution can be prepared.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation and sol-gel method, and in particular relates to a method for preparing titanium dioxide airgel by drying under normal pressure with butyl titanate as a precursor. Background technique [0002] TiO 2 Airgel is a porous three-dimensional network solid material formed by the aggregation of nanoparticles or polymer molecules. The size of its internal pores and basic constituent particles are all on the nanometer scale, and the specific surface area is between 50 and 1600m 2 / g, the porosity is as high as 80%~99.8%, and the pore size distribution is uniform, and the light transmission performance is also good. with TiO 2 Powder and film are different, TiO 2 Airgel is a transparent or translucent solid with high light transmission rate. Ultraviolet light can almost completely penetrate the airgel particles and excite the TiO on the surface and inside of the airgel. 2 , relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08
Inventor 郭兴忠孙赛李文彦杨辉
Owner ZHEJIANG UNIV
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