caa a22 4500 47709189X CHVBK 20180405111517.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF01134032 doi (NATIONALLICENCE)springer-10.1007/BF01134032 Determination of the hydroxyl content in gels and porous "glasses” from alkoxide hydrolysis by combined TGA and BET analysis [Elektronische Daten] [V. Vendange, Ph. Colomban] The hydroxyl group and water contents of alumina, mullite and alumino(boro)silicate gels and porous glasses (xerogels) are discussed on the basis of thermogravimetric, gas adsorption and density measurements. Comparison is made for powder prepared by instant hydrolysis and optically clear monoliths by slow hydrolysis, heated in various atmospheres (air, vacuum, hydrogen). The hydroxyl content appears to depend on the Al/Si ratio: 6 OH−/nm2 for alumina mesoporous glasses, 2 OH−/nm2 for aluminosilicate mesoporous glasses and 3 OH−/nm2 for microporous ones, typically. Kluwer Academic Publishers, 1996 sol-gel nationallicence water nationallicence hydroxyl nationallicence protons nationallicence sintering nationallicence aluminosilicates nationallicence Vendange V. ONERA-OM BP 72, 92322, Châtillon, France aut Colomban Ph ONERA-OM BP 72, 92322, Châtillon, France aut Journal of Porous Materials Kluwer Academic Publishers 3/3(1996-09-01), 193-200 1380-2224 3:3<193 1996 3 10934 https://doi.org/10.1007/BF01134032 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01134032 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vendange V. ONERA-OM BP 72, 92322, Châtillon, France aut NATIONALLICENCE 700 1- Colomban Ph ONERA-OM BP 72, 92322, Châtillon, France aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/3(1996-09-01), 193-200 1380-2224 3:3<193 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer