caa a22 4500 445850299 CHVBK 20180317145411.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1134/S0040579510051276 doi (NATIONALLICENCE)springer-10.1134/S0040579510051276 Obtaining of silica nanopowders from natural hydrothermal solutions [Elektronische Daten] [V. Potapov, N. Trutnev, V. Gorbach, M. Generalov, I. Romanova] Obtaining of nanodispersed silica powders from natural hydrothermal solutions is described. Hydrothermal solutions contain colloid silica forming as a result of the polycondensation of the molecules of orthosilicic acid. Via ultrafiltration with a membrane concentration of hydrothermal solutions, silica sols with SiO2 contents up to 600 g/dm3 (43.0 wt %) and particle radii of 29-135 nm are obtained. The silica powders with the specific surface area of 110-400 m2/g, average pore diameter of 3-10 nm, and pore volume of 0.2-0.3 cm3/g are obtained via the cryochemical vacuum-sublimation drying of sols with the use of liquid nitrogen. The particle size in the powders is in the range from 10 to 100 nm. Pleiades Publishing, Ltd., 2011 hydrothermal solution nationallicence silica sol nationallicence membrane concentration nationallicence cryochemical vacuum-sublimation drying nationallicence silica nanopowders nationallicence Potapov V. Research Geotechnological Center, Far East Branch, Russian Academy of Sciences, Severo-Vostochnoe sh. 30, 683002, Petropavlovsk-Kamchatskii, Russia aut Trutnev N. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut Gorbach V. Research Geotechnological Center, Far East Branch, Russian Academy of Sciences, Severo-Vostochnoe sh. 30, 683002, Petropavlovsk-Kamchatskii, Russia aut Generalov M. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut Romanova I. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut Theoretical Foundations of Chemical Engineering SP MAIK Nauka/Interperiodica 45/4(2011-08-01), 471-477 0040-5795 45:4<471 2011 45 11236 https://doi.org/10.1134/S0040579510051276 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0040579510051276 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Potapov V. Research Geotechnological Center, Far East Branch, Russian Academy of Sciences, Severo-Vostochnoe sh. 30, 683002, Petropavlovsk-Kamchatskii, Russia aut NATIONALLICENCE 700 1- Trutnev N. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut NATIONALLICENCE 700 1- Gorbach V. Research Geotechnological Center, Far East Branch, Russian Academy of Sciences, Severo-Vostochnoe sh. 30, 683002, Petropavlovsk-Kamchatskii, Russia aut NATIONALLICENCE 700 1- Generalov M. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut NATIONALLICENCE 700 1- Romanova I. Moscow State University of Engineering Ecology, Staraya Basmannaya ul. 21/4, 105066, Moscow, Russia aut NATIONALLICENCE 773 0- Theoretical Foundations of Chemical Engineering SP MAIK Nauka/Interperiodica 45/4(2011-08-01), 471-477 0040-5795 45:4<471 2011 45 11236 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer