Non-toxicity in multifunctional inorganic nanoparticles is rare. However, with careful engineering of silicon-based nanoparticles they can be used in vivo as imaging and drug-delivery agents and later degraded and cleared without toxic effects.
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Lin, VY. Veni, vidi, vici and then... vanished. Nature Mater 8, 252–253 (2009). https://doi.org/10.1038/nmat2413
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DOI: https://doi.org/10.1038/nmat2413
