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Dr. Yinsheng Wan, professor of biology at Providence College
What are the risks from nanoparticles of titanium in sunscreens? According to a recent blog in the New York Times, Titanium dioxide nanoparticles have been used increasingly in sunscreens in the last decade to protect the skin because the tiny particles directly absorb the radiation from sunlight, especially in the UVB range.
But because the particles are so tiny — generally about 100 nanometers across, compared with about 3,000 to 9,000 nanometers for a speck of dust — some scientists have raised concerns about whether they might do harm by seeping through the skin and into the bloodstream.
Dr. Yinsheng Wan is a professor of biology at Providence College. He is available to provide his expert opinion about nanoparticles and the use of sunscreen. To speak with him directly, please contact Chrissy Centazzo at (401) 340-5710, or firstname.lastname@example.org.
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