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Are Invisible Nano-sunscreens Safe ?
Dr Amanda Barnard of CSIRO Materials Science and Engineering in Melbourne carried out her computer simulation of titanium dioxide nanoparticles.
Nanoparticles are used to make some sunscreens transparent, increasing their appeal to some consumers.
"There's a whole range of demographics that would never ever use sunscreens if they were ugly," ABC Science quoted Barnard as saying.
"The transparent ones do increase usage and protection from skin cancer in certain demographics, so they do have an important function," he added.
However, she said that many doubts have been raised about the safety of such sunscreens.
One particular concern is whether the nanoparticles interact with sunlight to produce free radicals that damage tissues or DNA.
Barnard's computer model examined titanium dioxide nanoparticles from 3 to 200 nanometres in size.
"This is the size range that would generally be used in different types of sunscreens," she said.
The model predicted the affect of nanoparticle size and concentration on sun-protection ability, transparency and potential to produce free radicals.
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