- made from 2 or more materials
- = can make it have more useful properties
Glass-reinforced plastic (GRP)
- used for caar bodies + boats
- made from glass fibres bonded with polyester resin
- light + can be moulded but stronger than plastic
- glass fibre available as woven fabric, matting + loose strands
Carbon fibre reinforced plastic
- similar to GRP but instead carbon fibres are used
- lighter, stronger + tougher than GRP
- used for protective helmets, racing cars + bulletproof vests
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- shape memory alloy
- can be easily shaped when cool + returns to a 'remembered' shape when heated above a certain temperature
- e.g. glasses
- react to temp.
- when temp. changes colour of product changes
- used in babies' feeding spoons, kettles, mugs, thermometers etc...
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- used to make self-cleaning glass for windows = glass have a coating of nanoparticles that cause dirt to break down so it can be easily washed off by rainwater
- used to make anti-bacterial coatings - eg for toys - surfaces can be coated with a nanomaterial which contains nanoparticles that kill bacteria
- nanomaterials can be combined with other materials = nanocomposite
- some are worried that nanotechnology might have long-term risks; could be harmful to environment as they're really small + lightweight = carried into atmosphere + contaminate water?
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