单分散SiO_2无孔微球比表面积标准物质的研制  

Research and development of specific surface area standard reference materials of nonporous mono-disperse SiO_2 spheres

作　　者：张以梅[1] 周倩[1] 陈胜利[1] 董鹏[1] 袁桂梅[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《化工学报》2009年第5期1327-1331,共5页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2006CB932606);国家自然科学基金项目(50702077)~~

摘　　要：A new idea for specific surface area standard reference materials (SRM) which are made of nonporous mono-disperse SiO2 spheres and the true specific surface area can be calculated accurately from their diameters is presented.Firstly,the mono-disperse SiO2 spheres were synthesized in bulk.Secondly,the spheres were modified to make them nonporous.Thirdly,the characteristic dimensions,such as the size,density of the spheres,were determined accurately.Finally,the specific surface areas were measured by using a static volumetric type Brunauer-Emmett-Teller (BET) (nitrogen gas) instrument.The experimental results showed that the micro-holes on the surface of mono-disperse SiO2 spheres were almost be sealed by calcining at the temperature of 1000℃ for three hours.The BET surface area was larger than the geometric specific surface area and the values of the deviation were 1.2 m2·g-1,2.0 m2·g-1 and 3.6 m2·g-1 for mono-disperse SiO2 spheres with diameters 1150 nm,453 nm and 269 nm respectively.In this case,the theoretical value can be used as reference for the determination of the specific surface area of nonporous mono-disperse SiO2 spheres SRMs.A new idea for specific surface area standard reference materials （SRM） which are made of nonporous mono-disperse SiO2 spheres and the true specific surface area can be calculated accurately from their diameters is presented. Firstly, the mono-disperse SiO2 spheres were synthesized in bulk. Secondly, the spheres were modified to make them nonporous. Thirdly, the characteristic dimensions, such as the size, density of the spheres, were determined accurately. Finally, the specific surface areas were measured by using a static volumetric type Brunauer-Emmett-Teller （BET） （nitrogen gas） instrument. The experimental results showed that the micro-holes on the surface of mono-disperse SiO2 spheres were almost be sealed by calcining at the temperature of 1000℃ for three hours. The BET surface area was larger than the geometric specific surface area and the values of the deviation were 1.2 m^2 · g^-1, 2.0 m^2 · g^-1 and 3.6 m^2 · g^-1 for mono-disperse SiO2 spheres with diameters 1150 nm, 453 nm and 269 nm respectively. In this case, the theoretical value can be used as reference for the determination of the specific surface area of nonporous mono-disperse SiO2 spheres SRMs.

关 键 词：单分散SiO2微球 封孔 BET 比表面积 

分 类 号：TQ028.8[化学工程]