Hydroetching of high surface area ceramics using moist supercritical fluids
Aerogels having a high density of hydroxyl groups and a more uniform pore size with fewer bottlenecks are described. The aerogel is exposed to a mixture of a supercritical fluid and water, whereupon the aerogel forms a high density of hydroxyl groups. The process also relaxes the aerogel into a more...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
02.11.2004
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | Aerogels having a high density of hydroxyl groups and a more uniform pore size with fewer bottlenecks are described. The aerogel is exposed to a mixture of a supercritical fluid and water, whereupon the aerogel forms a high density of hydroxyl groups. The process also relaxes the aerogel into a more open uniform internal structure, in a process referred to as hydroetching. The hydroetching process removes bottlenecks from the aerogels, and forms the hydrogels into more standard pore sizes while preserving their high surface area. |
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Bibliography: | Application Number: US20010045930 |