caa a22 4500 606195327 CHVBK 20210128100918.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10934-015-9934-8 doi (NATIONALLICENCE)springer-10.1007/s10934-015-9934-8 Synthesis of silica aerogel microspheres by a two-step acid-base sol-gel reaction with emulsification technique [Elektronische Daten] [Yuxi Yu, Deqian Guo, Jiyu Fang] Silica aerogel microspheres were synthesized by a two-step acid-base sol-gel reaction in water-in-oil emulsion systems, in which tetraethoxysilane was used as a precursor and ethanol as a solvent, and HCl and NH4OH as acid-base catalysts in two steps. The synthesis process and parameters of the emulsion process including viscosity, surfactant concentration and stirring rate have been investigated. In the emulsifying process, the viscosity of silica sol is vital to restrain the occurrence of flocculation phenomenon for forming monodisperse alcogel microspheres. The smooth silica aerogel microspheres can be formed from the silica sol with the viscosity of 107mPas. The resultant silica aerogel microspheres with similar surface areas above 650m2/g, bulk densities in the range of 0.094-0.138g/cm3, and mean diameters ranging from 40.3 to 126.1μm can be formed by controlling these parameters of the emulsion process. The minimum of polydispersity and roundness of silica aerogel microspheres are 0.058 and 1.11, respectively. Furthermore, silica aerogel microspheres show a high capacity of uptaking bean oil, isopropanol, kerosene and n-hexane, highlighting the possibility to remove oils from water for oil spill cleanup. Springer Science+Business Media New York, 2015 Silica aerogel microspheres nationallicence Water-in-oil emulsion nationallicence Organic solvent uptaking nationallicence Porous materials nationallicence Yu Yuxi Department of Materials Science and Engineering, College of Materials, Xiamen University, 361005, Xiamen, China aut Guo Deqian Department of Materials Science and Engineering, College of Materials, Xiamen University, 361005, Xiamen, China aut Fang Jiyu Department of Materials Science and Engineering, Materials Processing and Analysis Center, University of Central Florida, 32816, Orlando, FL, USA aut Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 621-628 1380-2224 22:3<621 2015 22 10934 https://doi.org/10.1007/s10934-015-9934-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10934-015-9934-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yu Yuxi Department of Materials Science and Engineering, College of Materials, Xiamen University, 361005, Xiamen, China aut NATIONALLICENCE 700 1- Guo Deqian Department of Materials Science and Engineering, College of Materials, Xiamen University, 361005, Xiamen, China aut NATIONALLICENCE 700 1- Fang Jiyu Department of Materials Science and Engineering, Materials Processing and Analysis Center, University of Central Florida, 32816, Orlando, FL, USA aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 621-628 1380-2224 22:3<621 2015 22 10934