Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2005-12-13
2009-11-17
Mayes, Melvin C (Department: 1793)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C423S335000
Reexamination Certificate
active
07618608
ABSTRACT:
An ambient pressure, low cycle time method for the synthesis and manufacture of a low cost, highly insulting, highly translucent, and low density transition metal-based hydrophilic and hydrophobic nanogel. The important aspects are the method of synthesis, the stage of imparting hydrophobicity, and the process of manufacture. The method comprises the steps of mixing a chilled precursor solution with a chilled catalyst solution such that the mixture has a pH of between 9.5 and 12.2. The mixture is maintained at a temperature of 34° F.-55° F. for between 1 and 120 minutes to form a gel. The gel is silated the gel for about 120 minutes, washed in a wash fluid, then dried and annealed to form the aerogel.
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Loftus, K.D., Silica Aerogel Process Modeling and Experimental Investigations, Dissertation, University of California at Berkeley, Dec. 1989, University Microfilms International (Ann Arbor, MI), pp. 9-10, 16-18, 136-137, 140-141, 157, 166, 210, and 216-217.
Davis & Bujold P.L.L.C.
Keller Companies, Inc.
Mayes Melvin C
Patel Smita
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