Stable Silver Colloids and Silica-Coated Silver Colloids, and Methods of Preparing Stable Silver Colloids and Silica-Coated Silver Colloids
AssigneeGuardian Industries Corp.
InventorPRAMOD K. SHARMA
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Abstract
Methods for preparing silver colloids and silica-coated silver colloids are disclosed. The silver colloids may be prepared by heating a silver-containing solution, combining the heated silver-containing solution with an acid solution, and cooling the combined solutions to form a silver colloid containing silver particles. The silver particles in the silver colloid can further be coated with silica. A method for preparing antimicrobial coatings is also disclosed.
Claims20
A method of preparing a silver colloid, comprising:
- heating a silver-containing solution;
- combining the heated silver-containing solution with an acid solution;
- and
- cooling the combined solutions to form a silver colloid comprising silver particles.
A method of preparing a silica-coated silver colloid, comprising:
- heating a silver-containing solution;
- combining the heated silver-containing solution with an acid solution;
- cooling the combined solutions to form a silver colloid comprising silver particles;
- adding aqueous ammonia and ethanol to the silver colloid;
- and
- adding tetraethoxysilane to the silver colloid to form a silica-coated silver colloid comprising silica-coated silver particles.
A method of forming an antimicrobial coating, comprising:
- providing a substrate;
- preparing a silver colloid by heating a silver-containing solution, combining the heated silver-containing solution with an acid solution;
- and cooling the combined solutions to form a silver colloid comprising silver particles,
- coating the substrate with the silver colloid;
- and
- drying the coated substrate.
Dependencies are inferred from the claim text.