Ask a Scientist – Nano expert: Karen Wooley

The video discusses the use of nanotechnology in sunscreens, focusing on nanoparticles like titanium dioxide and zinc oxide. These particles enhance sunscreen effectiveness by scattering and absorbing light. Despite potential risks, such as photocatalytic activity, these are mitigated by coating the particles and ensuring they do not penetrate the skin deeply.

In what way can the risks of nanoparticles in sunscreens be mitigated?

• Coating the particles

• Using larger particles

• Avoiding their use

• Increasing concentration

What has research shown about the penetration of nanoparticles into the skin?

• They penetrate deeply

• They do not penetrate deeply

• They only penetrate in certain conditions

• Research is inconclusive