| 摘要 |
<p>The present invention provides for amorphous, nanoporous, ceramic material having a surface area in excess of 70 m2/gm and characterized by a high content of open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.03 cm3/gm of the ceramic. The invention also provides a process for the preparation of such nanoporous ceramics wherein a ceramic precursor polymer or oligomer is gradually heated in the presence of an inert gas or vacuum up to a maximum temperature in the range of greater than 400 °C up to about 650 °C. Optionally, the process may also include a cross-linking step conducted prior to the heating step wherein the precursor polymer or oligomer is heated in the presence of a cross-linking agent capable of undergoing addition or substitution reactions with backbone atoms present in said precursor material, at an intermediate temperature of about 100° to 400 °C for a period of time sufficient to cross-link said precursor material, followed by pyrolysis of the cross-linked material.</p> |
