Nanoparticles And Uses Flashcards
(17 cards)
What are nanoparticles?
Particles that are 1–100 nanometres in size.
What is a nanometre?
One billionth of a metre (1 × 10⁻⁹ m).
What is the surface area to volume ratio like for nanoparticles?
Very high surface area to volume ratio.
Why does high surface area to volume ratio make nanoparticles useful?
Because more surface area is available for reactions, making them more effective.
What are some common materials that can form nanoparticles?
Metals, carbon, and metal oxides.
What is a bulk material?
A material made up of many atoms or molecules, not on the nanoscale.
Why are nanoparticles used in sun creams?
They provide better UV protection as they have a high SA:V ratio
Why are nanoparticles used in cosmetics?
More cost effective and better absorption.
What is one advantage of using nanoparticles in catalysts?
They speed up reactions due to their high surface area.
How are silver nanoparticles used?
As antibacterial agents in socks, wound dressings, and sprays.
Why might nanoparticles be used in fuel cells?
To improve the efficiency of the reactions.
What is a potential risk of using nanoparticles?
They may be toxic or harmful if inhaled, ingested, or absorbed.
Why are the risks of nanoparticles not fully understood yet?
Because they are relatively new and long-term effects are unknown.
What is one environmental concern related to nanoparticles?
They may accumulate in ecosystems and harm wildlife.
What are fullerenes?
Carbon-based nanoparticles shaped like hollow spheres, tubes, or cages.
What is a potential use of fullerenes?
Drug delivery, lubricants, or materials for electronics.
What is a nanotube?
A cylindrical fullerene with high strength and electrical conductivity.
