CPC C03C 3/061 (2013.01) [C03C 3/089 (2013.01); C03C 4/00 (2013.01); C03C 15/00 (2013.01); C03C 17/30 (2013.01); C03C 23/0095 (2013.01); C03C 2204/00 (2013.01); C03C 2217/76 (2013.01)] | 20 Claims |
1. A method for preparing a glass composition, comprising
heating a borosilicate glass comprising 45-85 wt. % silicon oxide and 10-40 wt. % boron oxide to form a phase-separated glass comprising an interpenetrating network of silicon oxide domains and boron oxide domains;
removing at least a portion of the boron oxide domains from the phase-separated glass and depositing a hydrophobic silane to provide a porous glass having
a hydrophobic silane layer disposed on a portion of the surface thereof;
a total pore volume of 15-50 vol. %; and
an average pore diameter of 20-300 nm;
within at least a portion of the pore volume of the porous glass, forming an aerogel precursor; and
converting at least a portion of the aerogel precursor to an aerogel.
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13. A glass composition prepared according to a method comprising:
heating a borosilicate glass comprising 45-85 wt. % silicon oxide and 10-40 wt. % boron oxide to form a phase-separated glass comprising an interpenetrating network of silicon oxide domains and boron oxide domains;
removing at least a portion of the boron oxide domains from the phase-separated glass and depositing a hydrophobic silane to provide a porous glass having
a hydrophobic silane layer disposed on a portion of the surface thereof;
a total pore volume of 15-50 vol. %; and
an average pore diameter of 20-300 nm;
within at least a portion of the pore volume of the porous glass, forming an aerogel precursor; and
converting at least a portion of the aerogel precursor to an aerogel.
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14. A glass composition comprising an interpenetrating network of silicon oxide domains and aerogel domains, wherein
the aerogel comprises 15-50 vol. % of the composition;
the silicon oxide comprises 45-85 vol. % of the composition; and
the average size of the aerogel domains is 20-300 nm.
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