Engineered nanomaterials are fascinating. Just by making stuff smaller researchers have discovered forms of materials and even completely new materials that can be applied as diversely as better drugs, better paints or faster electronics. Using chemicals in a nanoscale version can completely alter their nature. We find nano-gold one of the most striking examples. The ‘big’ gold in its normal state is the yellow colored metal that does not interact with the body but nano-sized gold is purple or red, depending on its nanosize, and binds proteins very easily 1. Therefore, nano-gold is interesting both as a potential cancer drug
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