Vertically oriented hydrotalcite film in nano and micron composite structure and its preparing process

A composite structure and vertical orientation technology, applied in chemical instruments and methods, catalyst activation/preparation, aluminum compounds, etc., can solve the problems of poor thermal stability of the substrate, shedding, poor crystal orientation of LDHs, etc.

Inactive Publication Date: 2007-06-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of in-situ synthesis on the aluminum sheet after the surface anodization, has nano-micro composite structure and vertically oriented hydrotalcite-like film and its preparation method, solves the poor crystal orientation of LDHs in the LDHs film prepared in the past and easily from Problems such as shedding on the substrate and poor thermal stability of the substrate

Method used

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  • Vertically oriented hydrotalcite film in nano and micron composite structure and its preparing process
  • Vertically oriented hydrotalcite film in nano and micron composite structure and its preparing process
  • Vertically oriented hydrotalcite film in nano and micron composite structure and its preparing process

Examples

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Embodiment 1

[0031] The aluminum sheet with a thickness of 0.1mm (purity is 99.5%) was ultrasonically cleaned with ethanol for 5 minutes, then ultrasonically cleaned with water for 5 minutes to remove surface oil, and then anodized on an anodizing device for 50 minutes, and the aluminum sheet was taken out and rinsed with deionized water Electrolyte, obtain the anodized aluminum sheet for subsequent use. The anodizing device uses a lead plate or a stainless steel plate as the cathode, and the electrolyte is 1.0mol L -1 sulfuric acid solution, the oxidation current is 2A.

[0032] In a 1L Erlenmeyer flask, 1mol Ni(NO 3 ) 2 ·6H 2 O and 6mol NH 4 NO 3 Dissolve in deionized water, and adjust the pH of the solution to 7.5 with 1% dilute ammonia water.

[0033] Suspend the anodized aluminum substrate in the solution, seal the container, and react at a constant temperature of 120°C for 6 hours. After the reaction is completed, take out the aluminum substrate, rinse it with deionized water, ...

Embodiment 2

[0036] Ultrasonic cleaning of an aluminum sheet with a thickness of 0.05 mm (purity of 99%) with ethanol for 10 minutes, then ultrasonic cleaning with water for 10 minutes to remove surface oil, and then anodize on an anodizing device for 30 minutes, take out the aluminum sheet, and rinse off the electrolysis with deionized water. solution to obtain anodized aluminum sheets for later use. The anodizing device uses a lead plate or a stainless steel plate as the cathode, and the electrolyte is 1.0mol L -1 sulfuric acid solution, the oxidation current is 2A.

[0037] In a 1L Erlenmeyer flask, 1mol Ni(NO 3 ) 2 ·6H 2 O and 3mol NH 4 NO 3 Dissolve in deionized water, and adjust the pH of the solution to 5.5 with 1% dilute ammonia water.

[0038] Suspend the anodized aluminum substrate in the solution, seal the container, and react at a constant temperature of 75°C for 36 hours. After the reaction, take out the aluminum substrate, rinse it with deionized water, and dry it at 40...

Embodiment 3

[0041] 4 pieces of aluminum sheets with a thickness of 0.1mm and a purity of 99.5% were ultrasonically cleaned with ethanol for 5 minutes, then ultrasonically cleaned with water for 5 minutes to remove surface oil, and then anodized on an anodizing device for 50 minutes, and the aluminum sheets were taken out and rinsed with deionized water Electrolyte, obtain the anodized aluminum sheet for subsequent use. The anodizing device uses a lead plate or a stainless steel plate as the cathode, and the electrolyte is 1.0mol L -1 sulfuric acid solution, the oxidation current is 2A.

[0042] In a 1L Erlenmeyer flask, 1mol Ni(NO 3 ) 2 ·6H 2 O and 3mol NH 4 NO 3 Dissolve in deionized water, and adjust the pH of the solution to 7.0 with 1% dilute ammonia water.

[0043] Suspend 4 pieces of anodized aluminum substrates in the solution, seal the container, and react at a constant temperature at 100°C, take out a piece of aluminum substrate at 6, 12, 18, and 24 hours respectively, and ...

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Abstract

The present invention relates to vertically oriented LDHs film in nanometer and micron composite structure and its preparation process. By means of in-situ synthesis technology, and using aluminum sheet through surface anode oxidation as substrate and Al3+ source, and through dropping ammonia water to regulate the pH value of the reaction solution, reacting bivalent metal ion M2+ inside solution and ammonium nitrate in alkaline condition to produce metal complex ion to control the slow release of M2+ and the nucleation rate of LDHs on the substrate, the present invention grows oriented LDHs film with crystal face perpendicular to the substrate surface or (00l) direction and controllable density. The present invention is superior to available method, which has poor LDHs crystal orientation and other problems.

Description

Technical field: [0001] The invention relates to a hydrotalcite-like film with a nano-micro composite structure and a vertical orientation and a preparation method thereof, in particular to an in-situ synthesis method of a hydrotalcite-like film grown on an anodized aluminum substrate on the surface. technical background: [0002] Hydrotalcite-like, (also known as layered double hydroxy compound metal oxides, LDHs for short) is a kind of anionic layered structure functional material, which is composed of parallel and positively charged laminates, and the layers are composed of balanced anions and water molecules. constitute. Its chemical composition general formula is: [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- x / n )·mH 2 O, where M 2+ , M 3+ are the divalent and trivalent metal ions on the laminate, A n- Represents interlayer anions. Due to its unique crystal structure and physical and chemical properties, this kind of material shows extremely broad application prospec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/04C01F7/00C01B37/00
CPCB01J37/0226B01J27/236C25D11/24B01J23/007C25D11/20
Inventor 张法智陈虹芸段雪李殿卿付珊珊
Owner BEIJING UNIV OF CHEM TECH
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