Method for synthesizing monodisperse samarium-doped rare earth cerium oxide nanocrystal

A technology of rare earth oxidation and monodispersity, applied in the direction of rare earth metal compounds, chemical instruments and methods, nanotechnology, etc., can solve the problems of grain agglomeration and adhesion, difficult control of size, grain coarsening, etc., and achieve highly uniform particle size , Precise composition and strong applicability

Inactive Publication Date: 2010-11-24
南京睿磐内尔环保复合新材料有限公司
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the need to perform secondary heat treatment on the precursor product at a higher temperature in the process of inverse microemulsion-hydrothermal synthesis of samarium-doped cerium oxide nanocrystals and the resulting grain coarsening, and the size is difficult to control In view of the problems of grain agglomeration and adhesion, a method for the rapid crystallization of monodisperse samarium-doped rare earth cerium oxide nanocrystals was proposed by light irradiation.

Method used

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  • Method for synthesizing monodisperse samarium-doped rare earth cerium oxide nanocrystal
  • Method for synthesizing monodisperse samarium-doped rare earth cerium oxide nanocrystal
  • Method for synthesizing monodisperse samarium-doped rare earth cerium oxide nanocrystal

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example 1

[0031] A. With soluble nitrate Ce(NO 3 ) 3 and Sm(NO 3 ) 3 As the starting material, according to samarium doped cerium oxide (Ce 0.8 SM 0.2 o 2-δ ) stoichiometric ratio, accurate preparation of aqueous solution ([Ce 3+ ]=0.40mol / L, [Sm 3+ ]=0.10mol / L), in the obtained aqueous solution, add urea by the ratio of the molar weight of precipitating agent urea (Ur) and the metal ion molar weight in the aqueous solution to be 1.5:1, namely Stir to dissolve to obtain an aqueous phase solution.

[0032] B. Measure n-octane (n-octane) 100.0ml as oil phase, take cetyltrimethylammonium bromide (CTAB) as surfactant [CTAB]=0.25mol / L, n-butanol (n -butanol) is a co-surfactant, and the amount of addition is 5: 1 according to the ratio of the amount of its substance to CTAB, and 8.0ml of the above-mentioned prepared aqueous phase solution containing metal ions and precipitant of a certain volume is added dropwise, that is, the oil phase The volume ratio to the aqueous phase is 12.5:...

example 2

[0036] A. With soluble nitrate Ce(NO 3 ) 3 and Sm(NO 3 ) 3 As the starting material, according to samarium doped cerium oxide (Ce 0.8 SM 0.2 o 2-δ ) stoichiometric ratio, accurate preparation of aqueous solution ([Ce 3+ ]=0.40mol / L, [Sm 3+ ]=0.10mol / L), in the obtained aqueous solution, add urea by the ratio of the molar quantity of precipitant urea (Ur) and the metal ion molar quantity in the aqueous solution to be 4.0:1, namely stirring and dissolving to obtain an aqueous phase solution;

[0037] B. Measure n-octane (n-octane) 100.0ml as oil phase, take cetyltrimethylammonium bromide (CTAB) as surfactant [CTAB]=0.50mol / L, n-butanol (n -butanol) is a co-surfactant, the amount of addition is 5: 1 according to the ratio of the amount of its substance to CTAB, and 10.0 ml of the above-mentioned prepared aqueous phase solution containing metal ions and precipitating agent of a certain volume is added dropwise, that is, the oil phase With a volume ratio of 10:1 to the wa...

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Abstract

The invention relates to a method for synthesizing a monodisperse samarium-doped rare earth cerium oxide nanocrystal, belonging to the functional material preparation technical field. The method comprises the following steps: firstly, preparing an aqueous phase solution by using soluble cerium nitrate and samarium nitrate as raw materials and carbamide as a precipitant; forming an inverse microemulsion by using cetyl-trimethyl ammonium bromide as a surfactant, normal butyl alcohol as a cosurfactant and normal octane as an oil phase and adding the aqueous phase solution; filling the inverse microemulsion into a high-pressure reaction kettle the inner lining of which is made of polytetrafluoroethylene, heating for reaction, removing the normal octane from the reaction product by centrifugal separation, and removing the cetyl-trimethyl ammonium bromide and the normal butyl alcohol by washing to obtain a precursor product; and carrying out light irradiation on the precursor product to obtain the shape-controllable crystallized synthesized monodisperse samarium-doped rare earth cerium oxide nanocrystal which is uniform in particle size.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of functional materials, in particular to a method for synthesizing monodisperse samarium-doped rare earth cerium oxide nanocrystals by rapid crystallization through light irradiation. Background technique: [0002] As a functional rare earth oxide, cerium oxide with a fluorite structure is widely used in metal oxide semiconductor gas detectors, dehydrogenation catalytic oxidation, polishing powder and UV protection etc. Simple cerium oxide is a mixed conductor of ion and electron conductance, and its ions and electrons contribute almost the same to the conductivity, so it is not suitable to be directly used as an electrolyte material for solid oxide fuel cells. Rare earth doping such as gadolinium and samarium doped ceria can effectively suppress its electronic conductance and improve its ionic conductance. Therefore, rare earth doped ceria is considered to be a high-performance electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82B3/00
Inventor 刘俊亮叶佳梅陈磊张明
Owner 南京睿磐内尔环保复合新材料有限公司
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