Superomniphobic bulk optical glass

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.

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.