caa a22 4500 477091768 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF00489813 doi (NATIONALLICENCE)springer-10.1007/BF00489813 Subcritical drying of silica gels [Elektronische Daten] [Siv Hæreid, Elin Nilsen, Mari-Ann Einarsrud] Silica aerogel is a sol-gel prepared material characterized by high porosity and large inner surface area. Aerogels can be prepared with a high transparency and low thermal conductivity, giving a material excellent for application as transparent thermal insulator. The traditional route to prepare silica aerogels is by formation of an alcogel by hydrolysis and condensation of silicon alkoxides followed by supercritical drying in an autoclave at high pressure (-100 atm). Unfortunately, this process is expensive and might be dangerous, so drying methods have been developed that operate under ambient conditions. In previous work, we have shown that gels can be strengthened and stiffened by providing new monomers to the alcogel giving xerogels with similar properties as aerogels by drying at ambient pressure (porosity up to 90%). This method of obtaining ambient pressure dried aerogels will be described and special emphasis will be given on the effect of the initial gel structure on the preparation of the xerogels. Kluwer Academic Publishers, 1996 aerogels nationallicence xerogels nationallicence subcritical drying nationallicence Hæreid Siv Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut Nilsen Elin Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut Einarsrud Mari-Ann Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut Journal of Porous Materials Springer Netherlands 2/4(1996-12-01), 315-324 1380-2224 2:4<315 1996 2 10934 https://doi.org/10.1007/BF00489813 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00489813 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hæreid Siv Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut NATIONALLICENCE 700 1- Nilsen Elin Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut NATIONALLICENCE 700 1- Einarsrud Mari-Ann Department of Inorganic Chemistry, Norwegian Institute of Technology, University of Trondheim, 7034, Trondheim, Norway aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer Netherlands 2/4(1996-12-01), 315-324 1380-2224 2:4<315 1996 2 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer