SC26c Nanoparticles
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bulk materials, and examples?
~materials that consist of huge number of atoms ~lumps and powders
size of nanoparticles?
1x10-9
nanoparticulates?
substances that consist of nanoparticles
how to calculate total surface area of a cube?
width x height x 6
how to calculate a cubes volume?
width x height x length
how to calculate surface are to volume ratio?
surface area / volume
uses of nanoparticulate materials and why? 2
~sunscreen - nanoparticulate titanium dioxide is transparent because its particles are very small, but it still absorbs ultraviolet radiation ~stain resistant clothing - nanoparticle materials stay clean because nanoparticles catalyse the breakdown of dirt
risks of nanoparticles?
~their large surface area to volume ratios may allow them to catalyse harmful reactions or to carry toxic substances bound to their surfaces ~risks are difficult to determine because modern nanoparticulate materials have not been in use for long