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Cerium dioxide microsphere used as dimension standard material

A ceria and standard substance technology, applied in the field of ceria microspheres, can solve the problems of poor particle size uniformity, high degree of particle agglomeration, irregular morphology, etc., achieves good sphericity, is not easy to be eroded by bacteria, and has a large specific gravity. Effect

Active Publication Date: 2010-09-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

This kind of process based on precipitation and calcination produces particles with a high degree of agglomeration and irregular morphology.
[0007] It is also reported that under hydrothermal conditions, submicron-sized polycrystalline ceria microspheres were prepared by using different template agents to induce the hydrolysis nucleation and crystallization of cerium nitrate. Higher ceria particles, but still less uniform in particle size
[0008] Therefore, the current research on the controlled synthesis of spherical ceria particles is still immature. To obtain ceria particles with good sphericity and monodispersity in the submicron and nanoscale ranges, it is necessary to explore new synthesis processes.

Method used

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  • Cerium dioxide microsphere used as dimension standard material
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  • Cerium dioxide microsphere used as dimension standard material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 19.6g of cerium nitrate, 9.8g of polyvinylpyrrolidone (K90) and 400g of water, stir to dissolve, dilute to 500mL, pour it into a 1000mL hydrothermal kettle, set the hydrothermal temperature to 140℃, rotate speed 800rpm, and proceed A hydrothermal reaction, the reaction stopped after 48h. After the reaction kettle is cooled, the reaction product mixture is centrifuged at a centrifugal temperature of -4°C and a centrifugal speed of 10000 rpm for 20 minutes. The particles settle at the bottom of the centrifuge tube, and the supernatant is slowly poured into the centrifuge tube that has been cleaned beforehand. Collect and discard the bottom particles, centrifuge the supernatant again at the same temperature and speed for 20 minutes at high speed, remove the bottom particles of the centrifuge tube, collect the supernatant, and repeat the process twice to obtain the supernatant as the inorganic-organic composite template solution . Pour the composite template solution in...

Embodiment 2

[0028] Mix 55.6g of cerium nitrate, 48.5g of polyvinylpyrrolidone (K30) and 650g of water, stir to dissolve, dilute to 800mL, pour it into a 1000mL hydrothermal kettle, set the hydrothermal temperature to 170℃, rotate speed 25rpm, and proceed A hydrothermal reaction, the reaction was stopped after 24h. After the reactor is cooled, the reaction product mixture is centrifuged at a centrifugal temperature of -3°C and a centrifugal speed of 10000 rpm for 20 minutes. The particles settle at the bottom of the centrifuge tube, and the supernatant is slowly poured into the centrifuge tube that has been cleaned beforehand. Collect and discard the bottom particles, centrifuge the supernatant again at the same temperature and speed for 20 minutes at high speed, remove the bottom particles of the centrifuge tube, collect the supernatant, and repeat the process twice to obtain the supernatant as the inorganic-organic composite template solution . Pour the composite template solution into a...

Embodiment 3

[0031] Mix 158.8g of cerium chloride, 165.3g of polyvinylpyrrolidone (K60) and 1900g of water, stir to dissolve, dilute to 2100mL, pour it into a 3000mL hydrothermal kettle, set the hydrothermal temperature to 180°C, and rotate at 450rpm. The first hydrothermal reaction, the reaction was stopped after 36h. After the reactor is cooled, the reaction product mixture is centrifuged at a centrifugal temperature of 0°C and a centrifugal speed of 20,000 rpm for 25 minutes. The particles settle at the bottom of the centrifuge tube. The supernatant is slowly poured into the centrifuge tube that has been cleaned beforehand. The bottom particles are discarded, and the supernatant is centrifuged again at high speed for 25 minutes at the same temperature and speed to remove the bottom particles of the centrifuge tube, collect the supernatant, and repeat the treatment twice to obtain the supernatant as the inorganic-organic composite template solution. Pour the composite template solution in...

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Abstract

The invention relates to the technical field of the quantity transmission of the measuring and testing standard. Particularly, the invention relates to a cerium dioxide microsphere used as a dimension standard material. The cerium dioxide microsphere is an inorganic-organic hybrid microsphere and consists of cerium dioxide and polyvinylpyrrolidone molecules, wherein the weight ratio of cerium dioxide to polyvinylpyrrolidone is 11-16:1; the inorganic-organic hybrid microsphere is of a polycrystalline structure and belongs to the cubic system; the crystal structure is fluorspar structure; the structure cell is of a face-centred cubic structure; the shape factor of the microsphere is less than 1.2; and the relative uncertaitny of the dimension value is less than 5 percent. The cerium dioxide microsphere in the submicron / nano level, which is provided by the invention and is used as the granularity standard material, has the advantages of large proportion, high temperature resistance and acid and alkali resistance, does not swell in the organic solvent, is not easy to be eroded by germs and has the specific crystal structure.

Description

Technical field [0001] The present invention relates to the technical field of measuring and testing standard value transfer, and more specifically, the present invention relates to a ceria microsphere used as a size standard substance. Background technique [0002] With the development of powder technology and nanotechnology, sub-micron / nano powders have attracted more and more attention, and their development and application potential are beyond doubt. Therefore, the demand for detection of sub-micron / nano-scale powders is increasingly urgent. Various particle size measurement technologies and instruments suitable for this have also been continuously improved. However, due to the complexity of particle size characterization, no matter what principle the particle size measurement follows, the particle size measurement method requires sub-micron / nano-scale particle size standard materials (SRM) for correction or verification without exception. In addition, in the study of colloi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
Inventor 陈运法王奇王震沈根利叶树峰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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