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Hydrogenated amorphous silicon colloids of low surface area (<5 m2/g) are shown to exhibit complete in-vitro biodegradation into orthosilicic acid within 10–15 days at 37°C. When converted into polycrystalline silicon colloids, by high temperature annealing in an inert atmosphere, microparticle solubility is dramatically reduced. The data suggests that amorphous silicon does not require nanoscale...
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