Nanoparticles Flashcards
What is surface area to volume ratio?
- The smaller the particle
- The larger the surface area to volume ratio.
If you decrease the side of a cube by a scale factor of 10, what happens to the SA to volume ratio?
- The SA: V ratio increases by a scale factor of 10.
True or False. Nanosilver has the same properties as normal silver.
- False. They have different properties.
How big are nanoparticles?
- They are between 1 and 100nm.
What is the size of coarse particles?
- Between 10000nm and 2500nm
What is the size of fine particles?
- Between 100nm and 2500nm
What is the SA: V ratio for a cube with side length 10nm?
3nm: 5nm =
0.6
How is the property of nanoparticles having a large SA: V ratio useful in catalysts?
- More collisisions with reactants
- Less of material needed rather than NORMAL PARTICLES.
About how many atoms are in a nanoparticle?
- A few hundred atoms.
How are nanoparticles used to deliver drugs into the body?
- Drug trapped in fullerene
- Deliver drugs to correct cells without opening and damaging other cells.
What nanoparticles have antibacterial properties and where can they be used?
- Silver nanoparticles
- Deodrants, wound dressings, surgical masks.
Why can nanoparticles be used in moisturisers?
- They have properties to make them not oily.
- Good coverage
What are nanotubes used for?
- Composites
- Electrical circuits
Explain why nanotubes could be used in tennis rackets.
- They have high tensile strength
- Won’t add too much weight.
Why are nanoparticles useful in sun cream?
- Better UV protection
- Better coverage