| http://www.w3.org/ns/prov#value | - In this embodiment, the smaller size particles preferably have a volume average size of not greater than about 1 ??m, such as from about 0.5 ??m to about 1 ??m, and the larger size particles preferably have a volume average size of from about 1 ??m to about 5 ??m, more preferably from about 1 ??m to 2 ??m.
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