Colloidal precious metals
Colloidal precious metals refer to nanoparticles of precious metals like gold, silver, platinum, and palladium suspended in a liquid medium, typically water. These nanoparticles are characterized by their small size (ranging from 1 to 100 nanometers in diameter) and high surface area to volume ratio, which impart unique optical, electronic, and catalytic properties distinct from their bulk counterparts. Colloidal solutions of precious metals are prepared through various methods such as chemical reduction of metal salts or controlled precipitation techniques. They are utilized in diverse applications including catalysis, sensing, biomedical imaging, drug delivery, and environmental remediation due to their tunable properties and high reactivity.
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