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Article Why do some metal ions spontaneously form nanoparticles in w...
Adding HAuCl₄ or PtCl₄ to water results in their dissolution into ionic forms, with potential for further chemical reactions leading to nanoparticle formation. These processes are influenced by various factors including concentration, temperature, and the presence of reducing agents or light.
Gold and platinum (and other metals such as Pd) salts are easily reduced to the (colloidal) metal. Absorb solutions of such metals onto a porous plastic and they'll decompose within a day.
BTW, HAuCl4 is not found as such - it's a hygroscopic water-containing structure usually formulated as HAuCl4.xH2O.
Similarly, in aqueous solution we have PtCl4·5(H2O) - the pentahydrate.
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