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Method for preparing ultra-hydrophilic zinc oxide/titanium oxide film by using layer-by-layer self-assembling method

A technology of titanium oxide film and layer-by-layer self-assembly, which is applied in the field of super-hydrophilic film preparation, can solve the problems of heavy metal pollution, high energy consumption, and high cost, and achieve the effects of stable properties, simple production equipment, and low cost

Inactive Publication Date: 2011-10-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned methods often consume water, time, electricity, high energy consumption, high cost, and cause heavy metal pollution during the measurement process.

Method used

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  • Method for preparing ultra-hydrophilic zinc oxide/titanium oxide film by using layer-by-layer self-assembling method
  • Method for preparing ultra-hydrophilic zinc oxide/titanium oxide film by using layer-by-layer self-assembling method
  • Method for preparing ultra-hydrophilic zinc oxide/titanium oxide film by using layer-by-layer self-assembling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] After pickling, alkali washing and drying the glass substrate, the average transmittance of the white glass substrate in the visible light region is about 89%. figure 1 b. The self-made zinc oxide is diluted, wherein the mass percentage of zinc oxide is 0.01wt%, and the pH value is 7.5. The titanium dioxide colloid is self-made, wherein the titanium dioxide is an anatase phase, the grain size is about 7nm, the mass percentage of the titanium dioxide is 0.01wt%, and the pH value is 7.9. At room temperature and normal pressure, first immerse a white glass sheet with a length of 76.2mm, a width of 25.4mm, and a thickness of 1mm in the colloid containing zinc oxide for 10 minutes, then rinse it with deionized water for 5 minutes, and then immerse it in the colloid of titanium dioxide 15 minutes, this is one layer, and then repeated 7 times in order to make it 8 layers with a thickness of 160nm. After drying, the transmittance was measured. The film layer is colorless an...

Embodiment 2

[0041] At room temperature and pressure, first immerse a glass sheet with a length of 76.2mm, a width of 25.4mm, and a thickness of 1mm in the colloid containing zinc oxide for 20 minutes, then rinse it with deionized water for 5 minutes, dry it, and then immerse it in the colloid of titanium dioxide. Put in the colloid for 10 minutes, then rinse with deionized water for 5 minutes, dry this to form a layer, and repeat 11 times in order to make it reach 12 layers with a thickness of 260nm. The titanium dioxide colloid is self-made, wherein the titanium dioxide is an anatase phase, the grain size is about 7nm, the mass percentage of the titanium dioxide is 0.952wt%, and the pH value is 9.1. The self-made zinc oxide colloid is prepared by ultrasonic dispersion with distilled water, wherein the mass percentage of zinc oxide is 0.948wt%, and the pH value is 8.9. The contact angle of the film was measured after drying. Within 5 seconds, water is completely spread on the surface of ...

Embodiment 3

[0044] At normal temperature, the colloid containing zinc oxide is prepared, and the self-made zinc oxide colloid is diluted to the mass percentage: 0.037wt%, and the pH value is 9.2. Titanium dioxide-containing colloid is prepared by diluting the self-made titanium dioxide sol with deionized water, wherein the mass percentage of titanium dioxide is 0.072wt%, and the pH value is 8.5. After the conductive substrate FTO is ultrasonically cleaned with acetone and ethanol, it is dried, and at room temperature and pressure, a white glass sheet with a length of 76.2 mm, a width of 25.4 mm, and a thickness of 1 mm is first immersed in a colloid containing zinc oxide for 15 minutes. Then rinse with deionized water for 3 minutes, and then soak it in titanium dioxide colloid for 3 minutes, which is one layer, and repeat 11 times in order to make it reach 12 layers, which is calculated as FTO / (zinc oxide / titanium dioxide) 12 , with a thickness of 260nm.

[0045] In the preparation of th...

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Abstract

The invention relates to a method for preparing an ultra-hydrophilic zinc oxide / titanium oxide film by using a layer-by-layer self-assembling method. The method comprises the following steps that: (1) a substrate is immersed in zinc oxide colloid for 3 to 20 minutes, then is washed or rinsed by deionized water, and is dried, such that a substrate with positive electricity on the surface is obtained; (2) the substrate with positive electricity on the surface is immersed in titanium dioxide colloid for 3 to 20 minutes, then is washed or rinsed by deionized water, and is dried, such that a substrate with negative electricity on the surface is obtained; (3) the step (1) and the step (2) are repeated, and finally the substrate is sintered for 0.5 to 4 hours at a temperature of 400 to 500 DEG C, such that an ultra-hydrophilic zinc oxide / titanium oxide film is obtained. The method has advantages of simple equipment and low cost. The obtained film has good hydrophilic performance, and can be used for the determination of chemical oxygen demand in water quality analysis.

Description

technical field [0001] The invention belongs to the field of preparation of superhydrophilic thin films, in particular to a method for preparing superhydrophilic zinc oxide / titanium oxide thin films by a layer-by-layer self-assembly method. Background technique [0002] In high-temperature and high-humidity weather, after the air conditioner is turned on in the car, the windshield can easily form water mist that obstructs the line of sight. Turning on the heating and air conditioning in the car in winter in the northern region will also cause fogging or even frosting on the windshield. When the fog condenses on the surface of a transparent object, it will have a great impact on the transmission of light and affect the driver's vision. Surface wettability is an important physicochemical property of a solid surface, measured by the static or dynamic contact angle of a liquid. When the contact angle of the solid surface is less than 5°, it is called super hydrophilic material....

Claims

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Application Information

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IPC IPC(8): C03C17/34
Inventor 张青红毛睿奕王宏志李耀刚
Owner DONGHUA UNIV
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