2.1 Bonding, Structure & Properties
1. This question has 3 part(s).
1.1. This question is about nanoparticles in products used for protection against the sun.
Sun Screens Nanoparticles of titanium oxide are used in some sun creams. Sun screens that use nanoparticle technology spread more easily and provide better coverage so you use less. They are also transparent unlike traditional screens which are white. Normal sized particles of titanium oxide are safe but nanoparticles of this compound are thought to be absorbed into the body through our skin. Once in the body, they can travel around in our bloodstream unheeded. Some scientists suspect that these nanoparticles may be toxic to some types of cells found in the brain, skin, liver and bones. |
Explain why nanoparticles of titanium oxide are able to pass through the skin and travel around the body more easily than normal-sized particles of the same compound.
1.2. Give three reasons why sunscreens containing nanoparticles should be subjected to further testing.
1.3. Suggest why some companies that make sun creams might prefer to not engage in further testing.
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