Topic 9- Part 5 (bulk and surface properties) Flashcards
1
Q
How big is a nanoparticle?
A
-1-100 nm
- About 100x bigger than atoms and normal molecules
2
Q
What are the main useful properties of nanoparticles?
A
- Large SA:Volume -> catalyst
- Very small
3
Q
What are the possible risks of nanoparticles?
A
- Relatively new
- Don’t know harmful affects
- Inhaled nanoparticles can cause lung inflammation and heart problems
- Might catalyse harmful reactions in the body
4
Q
Why use and why not ceramics (bricks, glass)?
A
- Hard
- Strong under pressure
- Weak in tension
- Brittle
- Snap
5
Q
Why use and why not metal?
A
- Malleable
- Good conductors
- Ductile
- Stiff
6
Q
Why use and why not polymers?
A
- Poor electrical and heat conductors
- Low density
- Durable
7
Q
What could nanoparticles be used for?
A
- Delivering medicine (very small)
- Sunscreen (better coverage and UV protectant)
