caa a22 4500 467922969 CHVBK 20180406152922.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1134/S1087659606060046 doi (NATIONALLICENCE)springer-10.1134/S1087659606060046 Influence of the acid concentration on the morphology of micropores and mesopores in porous glasses [Elektronische Daten] [V. Kreisberg, V. Rakcheev, T. Antropova] The polymodal microporosity and mesoporosity of porous glasses prepared by through leaching of phase-separated alkali borosilicate glasses in hydrochloric acid solutions of different concentrations are investigated by two new methods based on an analysis of the kinetic and equilibrium isotherms of gas desorption at a temperature of 77.5 K under low partial pressures, as well as by a modified classical adsorption method under medium and high pressures. It is established that an increase in the concentration of hydrochloric acid in the leaching solution brings about transformations in the microporous and mesoporous structures of the porous glasses. The structural transformations can be summarized as follows: (i) a considerable decrease in the specific surface of mesopores and the corresponding increase in the diameter of secondary silica globules, (ii) a decrease in the mesopore volume and the corresponding increase in the coordination number of the packing of secondary silica globules in channels formed upon phase separation, (iii) an increase in the diameter of mesopores arising from gaps between secondary silica globules in channels formed upon phase separation, (iv) an increase in the diameter of regions in these channels that are partially or completely free from secondary silica globules, and (v) the formation of ultramicropores with a molecular size of 0.4-0.5 nm. Pleiades Publishing, Inc., 2006 Kreisberg V. Faculty of Chemistry, Moscow State University, 119992, Leninskie gory, Moscow, Russia aut Rakcheev V. Faculty of Chemistry, Moscow State University, 119992, Leninskie gory, Moscow, Russia aut Antropova T. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, 199034, St. Petersburg, Russia aut Glass Physics and Chemistry Nauka/Interperiodica 32/6(2006-12-01), 615-622 1087-6596 32:6<615 2006 32 10720 https://doi.org/10.1134/S1087659606060046 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1087659606060046 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kreisberg V. Faculty of Chemistry, Moscow State University, 119992, Leninskie gory, Moscow, Russia aut NATIONALLICENCE 700 1- Rakcheev V. Faculty of Chemistry, Moscow State University, 119992, Leninskie gory, Moscow, Russia aut NATIONALLICENCE 700 1- Antropova T. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, 199034, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Glass Physics and Chemistry Nauka/Interperiodica 32/6(2006-12-01), 615-622 1087-6596 32:6<615 2006 32 10720 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer