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What is the range of the diameter for course particles (dust)?
2500nm-10 000nm
What is the range of the diameter for fine particles?
100nm-2500nm
What is the range of the diameter for Nanoparticles?
1nm-100nm
How does the SA:V ratio affect nanoparticles?
As particles decrease in size, the size of their surface area increases in relation to their volume, causing the surface area to volume ratio to increase
This can cause the properties of a material to be different depending on whether its a nanoparticles or a bulk
E.g: You’ll need less of a material that’s made up of nanoparticles to work as an effective catalyst compared to a material made up of nor al sized particles
What can nanoparticles be used for?
Catalysts: high Sa:V ratio
Nano-medicine: absorbed easily into the body and can be used to deliver drugs
Electrical circuits for computer chips: conduct electricity
Added to polymer fibres → surgical masks, wound dressings, deodorants: antimicrobial properties of silver nanoparticles
Cosmetics: used in moisturises to make them less oily
What are nano particles currently being used for?
Sun creams: better at protecting skin from UV rays and provided better skin coverage
What are the risks and controversies of using nanoparticles?
Affect of products on the human body hasn’t been tested long-term
Unknown if it causes any damage to cells
If washed away can be damaging to the environment
Note 
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