wolbring

Nanotechnology in cosmetics – 2000 years ago…?

In nano on September 7, 2006 at 10:06 pm

Nanowerk Spotlight) These days we are debating if nanoparticles in sunblock and toothpaste are safe. The ancient Greeks and Romans didn’t know about such things – but they already used nanotechnology in their cosmetics. A group of researchers in France showed that lead-based chemistry, which was initiated in Egypt more than 4000 years ago, could result in the synthesis of lead sulfide (PbS, galena) nanocrystals. With a diameter of about 5 nm, the appearance of these crystals is quite similar to PbS quantum dots synthesized by modern materials science techniques.
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