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Natural super-hydrophilic porous TiO2/SiO2 composite thin film and preparation method thereof

A super-hydrophilic, composite film technology, applied in the direction of solid-state chemical plating, coating, metal material coating technology, etc., can solve the problems of unsatisfactory super-hydrophilic performance and achieve the effect of improving super-hydrophilicity

Inactive Publication Date: 2012-10-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is in order to overcome existing TiO 2 The shortcomings of the film's unsatisfactory superhydrophilic performance under visible light conditions, and a porous TiO 2 / SiO 2 Composite film preparation method

Method used

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  • Natural super-hydrophilic porous TiO2/SiO2 composite thin film and preparation method thereof
  • Natural super-hydrophilic porous TiO2/SiO2 composite thin film and preparation method thereof
  • Natural super-hydrophilic porous TiO2/SiO2 composite thin film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] At room temperature of 25°C, mix 10ml of tetraethyl orthosilicate and 40ml of absolute ethanol and stir for 30 minutes to make a stock solution (referred to as solution B): mix 20ml of absolute ethanol, 2.5ml of deionized water, 1ml of concentrated nitric acid (weight The fraction is about 65%, the same below) and mixed thoroughly to form a drop solution (referred to as solution A). Add solution A dropwise to solution B under strong stirring, continue to stir for 2 hours after the dropwise addition, and then seal and age for about 48 hours in the dark to form a stable SiO 2 Sol.

[0028] At room temperature of 25°C, mix 10ml of tetrabutyl titanate and 40ml of absolute ethanol and stir for 30min, then add 2ml of acetylacetone and 1.5ml of diethanolamine as a complexing agent for titanium alkoxide, fully mix all the added solutions, and prepare Make stock solution (denoted as D solution); 20ml absolute ethanol, 10ml deionized water, 1ml concentrated nitric acid are fully...

Embodiment 2

[0032] At 40°C, mix 10ml of tetraethyl orthosilicate and 40ml of absolute ethanol and stir for 30 minutes to prepare a stock solution (referred to as solution B): fully mix 20ml of absolute ethanol, 2ml of deionized water, and 0.5ml of concentrated nitric acid. Dubbed drop solution (referred to as A solution). Add solution A dropwise to solution B under strong stirring, continue to stir for 2 hours after the dropwise addition, and then seal and age for about 48 hours in the dark to form a stable SiO 2 Sol.

[0033] At 40°C, mix 10ml of tetrabutyl titanate and 40ml of absolute ethanol and stir for 30min, then add 2ml of acetylacetone and 0.5ml of ethanolamine as a complexing agent for titanium alkoxide, fully mix all the added solutions, and make a stock solution (referred to as D solution); 20ml of absolute ethanol, 10ml of deionized water, and 0.5ml of concentrated nitric acid are fully mixed to form a drop solution (referred to as C solution). Add solution C dropwise to so...

Embodiment 3

[0040] At 60°C, mix 10ml of tetraethyl orthosilicate and 30ml of absolute ethanol and stir for 30 minutes to make a stock solution (referred to as solution B): fully mix 20ml of absolute ethanol, 5ml of deionized water, and 1.5ml of concentrated nitric acid. Dubbed drop solution (referred to as A solution). Add solution A dropwise to solution B under strong stirring, continue to stir for 2 hours after the dropwise addition, and then seal and age for about 48 hours in the dark to form a stable SiO 2 Sol.

[0041] At 60°C, mix 10ml of tetrabutyl titanate and 40ml of absolute ethanol and stir for 30min, then add 2ml of acetylacetone and 4ml of triethanolamine as a complexing agent for titanium alkoxide, fully mix all the added solutions, and make a stock solution (referred to as D solution); 20ml of absolute ethanol, 10ml of deionized water, and 1.5ml of concentrated nitric acid were fully mixed to form a dropwise solution (referred to as C solution). Add solution C dropwise to...

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Abstract

The invention relates to a natural super-hydrophilic porous TiO2 / SiO2 composite thin film and a preparation method thereof. The preparation method comprises the following steps of: adopting a sol-gel method and respectively taking tetrabutyl titanate and ethyl orthosilicate as precursors to prepare TiO2 sol and SiO2 sol; calculating according to the molar fraction, compounding through taking the addition quantity of the SiO2 sol as 1-50 percent of total contents of SiO2 and TiO2 to obtain TiO2 / SiO2 composite sol; and coating the prepared composite sol on a substrate material, airing, calcining and cooling to obtain the super-hydrophilic thin film. The natural super-hydrophilic porous TiO2 / SiO2 composite thin film and the preparation method thereof have the beneficial effects that the thin film prepared by the method has the double effects of phase separation-induced developed hole structure and SiO2 compounding, the aperture of the thin film is within the scope of 100 nm-6 mum, the thickness of the thin film is within the scope of 200 nm-20 mum, a contact angle of the surface of the thin film with water is below 5 degrees, and the self-cleaning, antifogging and antibacterial functions are optimal.

Description

technical field [0001] The invention relates to a composite film, especially a kind of natural superhydrophilic porous TiO 2 / SiO 2 Composite film and method for its preparation. Background technique [0002] superhydrophilic TiO 2 Due to their excellent optical, chemical, and hydrophilic properties, thin films have broad application potential in self-cleaning, anti-fog, antibacterial, anti-corrosion, biomedical applications, drug delivery systems, solar cells, heat transfer, etc. But since TiO 2 It has a large forbidden band width of 3.2eV, and the utilization rate of light energy is very low. Only ultraviolet light can induce TiO 2 produces superhydrophilicity, which leads to TiO 2 Thin films have yet to achieve large-scale practical applications. Currently preparing TiO 2 Thin film methods mainly include cathodic electrochemical deposition, anodic oxidation, electrospinning, hydrothermal method, chemical vapor deposition, magnetron sputtering, pulsed laser depositi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/23C04B41/85C23C20/08
Inventor 黄洪黄涛司徒粤谢德龙黄伟欣
Owner SOUTH CHINA UNIV OF TECH
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