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.

What is the primary purpose of using nanotechnology in sunscreens?

• To change their color

• To improve the appearance and texture

• To make them waterproof

• To increase the cost of production

Which nanoparticles are commonly used in sunscreens?

• Copper and iron

• Gold and silver

• Aluminum and lead

• Titanium dioxide and zinc oxide

How do nanoparticles enhance the effectiveness of sunscreens?

• By making them smell better

• By scattering and absorbing light

• By increasing their weight

• By making them sticky

What is a potential risk of using nanoparticles in sunscreens?

• They can cause allergic reactions

• They can cause sunburn

• They can make the skin oily

• They can penetrate the skin deeply

How are the risks of nanoparticles in sunscreens mitigated?

• By reducing the SPF

• By coating the particles

• By adding more chemicals

• By using larger particles