5.2.4.1 Sizes of Particles and Their Properties Flashcards
1
Q
What does nanoscience refer to?
A
- structures that are 1-100 nm in size
2
Q
How small are nanoparticles?
A
- smaller than fine particles (PM2.5)
- these have diameters between 100 and 2500 nm
3
Q
What size are course particles? (PM10)
A
- diameters between 1x10-5 and 2.5x10-6m
4
Q
What are course particles often referred as?
A
- dust
5
Q
What happens as the size of cube decreases by a factor of 10?
A
- the surface area to volume ratio increases by a factor of 10
6
Q
Why might nanoparticles have different properties compared to the same materials in bulk?
A
- high surface area to volume ratio
7
Q
What does a high surface area to volume ration mean?
A
- smaller quantities are needed to be effective than for materials with normal particle sizes
