Long description of figure 1

Ilustrations show nonporous primary particles (less than 1 nanometer; dense silica), mesopores, channels to micropores, porous secondary particles (about 5 to 10 nanometers; density about one-half silica), surface carbamate (OCN-R-NH(CO)O-Si-O-Si-), and partially blocked channels.

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Last updated: July 19, 2005 11:01 AM

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