| http://www.w3.org/ns/prov#value | - the walls comprising a plurality of RxMg2Al4???xSi5???xO18 or RxMg2???xAl4Si5O18 fibers bonded to form a porous structure having an open network of pores, wherein at least about 20% of the plurality of RxMg2Al4+xSi5???xO18 or RxMg2???xAl4Si5O18 fibers within the walls being aligned in a common direction wherein x is greater than zero and R is an element other than Mg, Al, Si, or O.
|
