| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Properties of SiO2 Gel Dry Water Powders |
| SHI Yanjuan, FENG Mengmeng, CHEN Guangnan, XIAO Huan, SHI Guibin, CAO Chengran, HE Song
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| School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China |
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Abstract In this paper,a gel dry water was prepared using SiO2 gel as the core and hydrophobic nano SiO2 particle as the shell under high-speed shear. Powder parameters like fluidity, stability, particle size distribution, bulk density and water repellency were studied. The results show that compared with the traditional dry water powder, SiO2 gel dry water powder shows smaller repose angle, larger outflow velocity and better fluidity. The traditional dry water powder can be destroyed at the centrifuge speed of 2 000 r/min, while SiO2 gel dry water powder only agglo-merate when the centrifuge speed reaches 6 000 r/min. The bulk density of SiO2 gel dry water powder is smaller than dry water powder. For the existence of hydrophobic nano SiO2 shell, the as-prepared SiO2 gel dry water powder presents excellent water repellency.
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Published: 24 July 2020
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About author:: Yanjuan Shi, master of safety engineering, Wuhan University of Technology. Mainly engaged in preparation and characterization of porous gel materials and fire prevention research.
Song Hereceived his Ph.D. degree in safety science and engineering from University of Science and Technology of China. Currently, his major locates in the protection mechanism of thermal & respiratory protection materials, as well as their preparation, characte-rization and application. |
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2020, Vol. 34 
