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- W2782096356 abstract "In this work, we developed a new method to synthesize silica aerogel microspheres via ambient pressure drying (APD) process without applying any surfactants and mechanical stirring. An ethanol solution of partially hydrolyzed, partially condensed silica (CS) was used as precursor in the synthesis, the water-repellent n-Heptane as solvent, while the water-soluble ammonia gas (NH3) as catalyst. After a fast sol-gel process and APD process, aerogel microspheres were obtained in the form of white powder with packing density ranged from 62 mg/cm3 to 230 mg/cm3 for different samples. The SEM images exhibited fine spherical morphology for these aerogel microparticles, and their statistical average particle diameter ranged from 0.8 μm to 1.5 μm. Besides, according to the analysis of N2 adsorption-desorption isotherms, the BET surface area of these aerogel microspheres was in the range of 800–960 m2/g, and a considerable volume of micropores was detected along with the abundant mesospores in these microspheres, which was further confirmed by the TEM image and SAXS curve. Based on the very limited solubility of NH3 in the reaction system, a non-emulsion formation mechanism was proposed to illustrate the formation of these aerogel microspheres." @default.
- W2782096356 created "2018-01-12" @default.
- W2782096356 creator A5054350918 @default.
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- W2782096356 date "2018-04-01" @default.
- W2782096356 modified "2023-10-17" @default.
- W2782096356 title "Surfactant-free synthesis of silica aerogel microspheres with hierarchically porous structure" @default.
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- W2782096356 doi "https://doi.org/10.1016/j.jcis.2018.01.010" @default.
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