Titanium oxide is used in some sun creams. Which is an advantage of using nanoparticles of titanium oxide rather than normal-sized particles of titanium oxide in sun creams?

The main advantage of using nanoparticles in applications like sun creams, catalysts, and drug delivery is their extremely high surface area to volume ratio. This means that for the same mass, nanoparticles have a much larger surface area exposed compared to larger particles. In sun cream, this allows for better coverage of the skin, meaning a smaller mass of nanoparticles is required to achieve the same sun-blocking effect as a larger mass of normal-sized particles. They also appear transparent on the skin, which is a cosmetic advantage.