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Method for preparing nano aluminate lanthanum powder

A nano-aluminum and powder technology, applied in the field of nano-materials, can solve the problems of large size, irregular shape and high temperature of lanthanum aluminate powder, and achieve the effects of reducing production cost, regular shape and easy control.

Inactive Publication Date: 2008-04-09
重庆工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of nano-lanthanum aluminate powder, which can solve the problem of high temperature required for the preparation of nano-lanthanum aluminate powder by traditional methods, large size of lanthanum aluminate powder, irregular shape and agglomeration serious problem

Method used

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  • Method for preparing nano aluminate lanthanum powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: after getting 8 gram Span80, 12 gram Tween80, 10 gram n-butanols, 70 gram hexanaphthene mixed stirring at room temperature, add 11.1 gram concentration and be the mixed aqueous solution (nitric acid The mol ratio of lanthanum and aluminum nitrate is 1: 1), after stirring, microemulsion A is made; After mixing and stirring 8 gram Span80, 12 gram Tween80, 10 gram n-butanol, 70 gram cyclohexane at room temperature, add 11.1 gram Ammonia water with a concentration of 2mol / L is the water phase. After stirring, microemulsion B is made; add B into A under stirring, and control the pH value to 9.5 until a uniform and transparent microemulsion C is formed; add 20g of acetone into microemulsion C, After stirring, separate with a centrifuge and draw the supernatant. The precipitate was washed with 10 g of acetone-ethanol mixture with a volume ratio of 1:1, and then centrifuged, and the supernatant was still drawn after centrifugation. This was repeated three times, a...

Embodiment 2

[0018] Embodiment 2: After mixing and stirring 8 gram Span80, 12 gram Tween80, 10 gram n-butanol, 60 gram hexanaphthene at room temperature, add 10 gram concentration and be the mixed aqueous solution of 0.15mol / L lanthanum nitrate and aluminum nitrate (lanthanum nitrate The molar ratio of aluminum nitrate and aluminum nitrate is 1: 1), and microemulsion A is made after stirring; After mixing and stirring 8 gram Span80, 12 gram Tween80, 10 gram n-butanol, 60 gram cyclohexane at room temperature, add 10 gram The concentration is 3mol / L ammonia water as the water phase, and after stirring, microemulsion B is made; under stirring, B is added to A, and the pH value is controlled to 9.5, until a uniform and transparent microemulsion C is formed; 20g of acetone is added into microemulsion C, After stirring, separate with a centrifuge and draw the supernatant. The precipitate was washed with 10 g of acetone-ethanol mixture with a volume ratio of 1:1, and then centrifuged, and the sup...

Embodiment 3

[0019] Embodiment 3: After mixing and stirring 5 gram Span80, 15 gram Tween80, 11 gram n-butanol, 70 gram hexanaphthene at room temperature, add 8 gram concentration and be the mixed aqueous solution of 0.2mol / L lanthanum nitrate and aluminum nitrate (lanthanum nitrate The molar ratio of aluminum nitrate and aluminum nitrate is 1: 1), after stirring, microemulsion A is made; at room temperature, after mixing and stirring 5 grams of Span80, 15 grams of Tween80, 11 grams of n-butanol and 70 grams of cyclohexane, add 8 grams of concentration 1mol / L ammonia water is the water phase, and after stirring, microemulsion B is made; under stirring, B is added to A, and the pH value is controlled to 10.5, until a uniform and transparent microemulsion C is formed; 20g of acetone is added into microemulsion C, and stirred After separation with a centrifuge, draw the supernatant. The precipitate was washed with 10 g of acetone-ethanol mixture with a volume ratio of 1:1, and then centrifuged...

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Abstract

The invention relates to a method for preparing nanometer lanthanum aluminate powders. The method comprises the following steps: mixing and stirring microemulsion with the composite of Span80 and Tween80 as the surfactant, with n-butanol as the assistant surfactant and respectively with water solution of lanthanum nitrate and aluminum nitrate and ammonia water as the aqueous phase; after separation, washing and drying, incinerating the product at 750-1000 DEG C to obtain globular lanthanum aluminate powders with high purity, light agglomeration and particle diameter range of 20-60mm. The method of the invention solves problems of the traditional nanometer lanthanum aluminate powder preparing method, including high temperature, large lanthanum aluminate powder size, morphological irregularity and serious agglomeration. The product can be used as key materials for microwave devices such as wave filters, harmonic oscillators, superconductive films, etc., and can also be applied as the catalyst for oxidative coupling of methane as well as hydrogenization and hydrogenolysis of hydrocarbons.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, more precisely, relates to a preparation method of nanometer lanthanum aluminate powder. Background technique [0002] Lanthanum aluminate (LaAlO 3 ) has good microwave dielectric properties and is widely used as a key material for microwave devices such as filters and resonators. LaAlO 3 It has good lattice matching and close thermal expansion coefficient with high-temperature superconducting and ferroelectric thin films, so it is also widely used as a substrate material for superconducting thin films of microwave devices. And LaAlO 3 The powder has high contact reactivity and is therefore also used as a catalyst for the oxidative coupling of methane and the hydrogenation and hydrogenolysis of hydrocarbons. [0003] Currently, LaAlO is commonly used 3 The preparation method of the powder is a high-temperature solid-phase synthesis method, that is, the oxides of lanthanum and alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01F7/02
Inventor 田中青黄伟九梁依经
Owner 重庆工学院
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