Method for preparing octahedral barium molybdate

A technology of barium molybdate and octahedron, which is applied in the field of preparation of inorganic functional materials, and achieves the effects of mild conditions, easy control, low cost and no energy consumption

Inactive Publication Date: 2010-12-22
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Uniform octahedral barium molybdate has not been reported in the literature

Method used

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  • Method for preparing octahedral barium molybdate
  • Method for preparing octahedral barium molybdate
  • Method for preparing octahedral barium molybdate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation contains 0.2mol / LBa 2+ Microemulsion A, wherein the mixed mass content of surfactant (alkyl polyoxyethylene (10) ether (OP-10)) and alcohol is 34%, the mol ratio ω of water and surfactant is 5, all the other are oil Phase content; the MoO with the corresponding content of each component consistent with that of microemulsion A was obtained 4 2- microemulsion B. Under the condition of stirring at room temperature, microemulsion A was added dropwise into microemulsion B, and the stirring was continued for 30 minutes after the dropwise addition was completed. After the stirring was stopped, it was sealed, and left to stand and aged at room temperature for 24 hours. Centrifugal separation, washing to obtain granular barium molybdate nanocrystals, such as figure 1 . Under this condition, octahedral barium molybdate has not been obtained due to the restriction of the microemulsion water core structure.

Embodiment 2

[0028] Preparation contains 0.05mol / LBa 2+ The microemulsion A, wherein the mixed mass content of surfactant (alkyl polyoxyethylene (10) ether (OP-10)) and alcohol is 34%, the mol ratio ω of water and surfactant is 10, all the other are oil Phase content; the MoO with the corresponding content of each component consistent with that of microemulsion A was obtained 4 2- microemulsion B. Under the condition of stirring at room temperature, microemulsion A was added dropwise to microemulsion B, and the stirring was continued for 30 minutes after the dropwise addition was completed. After the stirring was stopped, it was sealed, and left to stand at room temperature for aging for 4 hours. Centrifugal separation and washing to obtain octahedral barium molybdate nanocrystals. The increase of water content changes the structure of the microemulsion, and then images the morphology of the product, but due to the short time, the crystallinity is not good.

Embodiment 3

[0030] Preparation contains 0.05mol / LBa 2+ The microemulsion A, wherein the mixed mass content of surfactant (alkyl polyoxyethylene (10) ether (OP-10)) and alcohol is 34%, the mol ratio ω of water and surfactant is 20, all the other are oil Phase content; the MoO with the corresponding content of each component consistent with that of microemulsion A was obtained4 2- microemulsion B. Under the condition of stirring at room temperature, microemulsion A was added dropwise into microemulsion B, and the stirring was continued for 30 minutes after the dropwise addition was completed. After the stirring was stopped, it was sealed, and left to stand at room temperature for 48 hours of aging. Centrifugal separation, washing to obtain octahedral barium molybdate nanocrystals, such as figure 2 . It can be seen that when the aging time is long enough, the crystallinity is intact.

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Abstract

The invention provides a method for preparing a barium molybdate octahedron. In the method, quaternionic micro-emulsion which comprises nonionic surfactants of alkyl polyoxyethylene (10), ether (OP-10), cyclohexane, n-octanol and water phase is selected to be used and sodium molybdate and barium chloride are used as reactants. After being mixed, components for composing reverse micro-emulsion arestirred strongly in a magnetic stirrer to prepare the uniform and transparent reverse micro-emulsion with stable property. Then, the micro-emulsion of barium chloride is dropped into the micro-emulsion of sodium molybdate. After reaction, aging and centrifugal separation, anhydrous alcohol and secondary water are used for repeated washing to obtain the barium molybdate octahedron with uniform morphology, size and height. The technical proposal which utilizes template action of reverse micelle micro-emulsion for preparing the octahedral barium molybdate solves the hard problems that by the existing barium molybdate octahedron preparing method, the particle size and the morphology of products cannot be controlled conveniently and preparation conditions are harsh. The method for preparing the octahedral barium molybdate has the characteristics of simple production process, safe production process and uneasy agglomeration of products and can be widely applied to the preparation of inorganic functional materials.

Description

technical field [0001] The invention relates to the preparation of an inorganic functional material, in particular to a method for preparing barium molybdate octahedra with a highly uniform shape and size by using an inverse microemulsion method. Background technique [0002] Barium molybdate is a tetragonal alkaline earth metal molybdate with a scheelite structure. Due to its special photoelectric properties, scintillator properties, and humidity sensing properties, it has become a popular inorganic functional material. substance of concern. Barium molybdate is not only an excellent photoelectric functional material, but also has potential applications in humidity sensors, laser substrates, etc. The special properties endowed by the nanoscale novel structure will enable barium molybdate to be applied in a wider range of fields. [0003] At present, there are mainly the following methods for synthesizing barium molybdate nanocrystals: high temperature melting crystallizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00
Inventor 黄在银米艳周泽广姜俊颖李艳芬
Owner GUANGXI UNIV FOR NATITIES
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