Water-based hydrolysis method for forming hollow particles
AssigneeImam Abdulrahman Bin Faisal University
InventorsAyhan Bozkurt, Seyda Tugba Gunday Anil, Munirah Abdullah Almessiere, Sultan Akhtar
Life of this patent
Estimating the term…
Abstract
A method for forming hollow silica spheres by dissolving a hydrolyzable aryl silane in an aqueous solution of water and an acid to form a hydrolyzed silane solution, mixing the hydrolyzed silane solution with a hydroxide base to form a precipitate, and calcining the precipitate in a multi-stage calcination procedure that includes (a) heating to a first temperature of 180 to 240° C. with a first ramp rate of 3 to 10° C./min and holding the first temperature for 2 minutes to 2 hours, then (b) heating to a second temperature of 600 to 740° C. at a second ramp rate of 0.1 to 4° C./min, and holding the second temperature for 2 to 24 hours.
Claims11
A method for forming hollow silica particles, the method comprising:
- dissolving a trialkoxy(aryl) silane in an aqueous solution comprising water and an acid to form a hydrolyzed silane solution;
- mixing the hydrolyzed silane solution with a hydroxide base to form a precipitate in a suspension;
- separating the precipitate from the suspension;
- washing the precipitate with an organic solvent and water;
- then
- calcining the precipitate to form hollow silica spheres, wherein the calcining is performed by
- heating to a first temperature of 180 to 240° C. with a first ramp rate of 3 to 10° C./min and holding the first temperature for 2 minutes to 2 hours, then
- heating to a second temperature of 600 to 740° ° C. at a second ramp rate of 0.1 to 4° C./min, and holding the second temperature for 2 to 24 hours,
- wherein a template is not employed for forming the hollow silica spheres.
Dependencies are inferred from the claim text.