Ksksk Flashcards
Compare the side of nanoparticles to atoms and molecules
Nano contain a few hundred atoms and are between 1-100nm across
What are some risks associated with nanoparticulate materials
Little is known about the effects of nano
May be harmful to health - enter bloodstream
May catalyse harmful reactions inside body
Why woul nanoparticle be useful catalysts
Nano have a very high surface area to volume
What is the equation to calculate SA to volume rario
SA to volume ratio= SA / Vol
Why might nanotubes be used to make electrical circuits for computers
Can conduct electricity
Are small so take up little space
Light weight
Why might nanoparticles be used in sunscreen
Some nano block UV light
Nano don’t leave white marks on skin
What are general properties of glass ceramics
Transparent
Strong but brittle
Easily moulded into shapes
What are general porperties of clay ceramics
Opaque
Soft and malleable
Hardened with heat
What are general porperties of polymers
Can be adapted to suit purpose
Usually tough and flexible
Poor conductors
General properties of metals
Shiny
Malleable
Ductile
Good conductors
What is a composite material
Contains two or more matierals with different properties
Usually two components
The reinforcement and the matrix
Why do composite materials have a wide range of different properties
As composite materials are made of several materials
Properties can be tailored to suit need of composite
Diff composite contain diff reinforcements and matrices so the properties vary
What should be used to construct ladder buildings reinforced concrete or fibreglass
Reinforced concreate because it’s strong in compression and tension and slightly flexible
What should be used to make tennis rackets timber or fibre reinforced plastic
Fibre reinforced plastic because it has a low density so it is light weight and is flexible and stro in tension
