Uses of Nanoparticles Flashcards

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How are nanoparticles used in sunscreens?

Nanoparticles of metals like zinc oxide or titanium dioxide are put in sunscreens to block harmful ultraviolet (UV) rays from the Sun and protect the skin.

Why can nanoparticle sunscreens look clearer on the skin than older sunscreens?

Nanoparticles are so small that they do not reflect as much visible light, so the cream can look clear or nearly clear instead of thick and white.

How are nanoparticles used in deodorants?

Some deodorants contain nanoparticles, such as silver nanoparticles, which kill bacteria on the skin that cause body odour.

How are nanoparticles used in medicine?

Nanoparticles can carry drugs to a specific part of the body, for example to a tumour, so that the medicine is released where it is most needed.

Why are nanoparticles useful as catalysts in industry?

Nanoparticles have a very large surface area compared to their size, so there are many active sites for reactions, which makes them very effective catalysts.

How are nanoparticles used in electronic devices?

Nanoparticles are used to make very small wires and components, which helps produce tiny, fast and powerful electronic circuits in devices like phones and computers.

How can nanoparticles be used to make self‑cleaning windows?

A thin layer of nanoparticles, such as titanium dioxide, can be put on the glass; they help break down dirt and make water spread out, so rain can wash the window clean.

How are nanoparticles used in fabrics and clothing?

Nanoparticles can be built into fabrics to make clothes that are stain‑resistant, waterproof or antibacterial, so they stay cleaner and fresher for longer.

How are nanoparticles used in cosmetics other than sunscreens?

In some cosmetics, nanoparticles help creams spread more smoothly, feel lighter on the skin and deliver active ingredients more evenly.

How does the large surface area of nanoparticles make them useful in many products?

Because nanoparticles have a large surface area, they can react or interact more with other substances, which improves their effect in products like catalysts, sunscreens and deodorants.

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