Developments in new materials Flashcards

1
Q

what is a modern material

A

a material that has been engineered to have improved properties

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2
Q

examples of modern materials

A

Concrete, aluminium and steel, graphene, titanium, metal foams

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3
Q

properties of graphene

A
  • single carbon layer material
  • very strong, 100x stronger than steel
  • light
  • good conductor of heat and electricity
  • used in tennis rackets
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4
Q

properties of titanium

A
  • corrosion resistant
  • high strength to weight ratio
  • difficult and therefore expensive to machine
  • used for bone replacements, bikes, ships, armour
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5
Q

properties of metal foams

A
  • metal foam is a metal that contains many gas filled spaces which make it LIGHTWEIGHT
  • stiff
  • tough
  • strong under compression
  • used in lightweight car parts(as they can absorb shock) and bone implants
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6
Q

properties of LCDs

A
  • used in flat screen displays
  • thin
  • lightweight
  • energy efficient
  • originally used in calculators
  • high definition displays
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7
Q

how do LCDs work in a display

A
  • the liquid crystals used in the display are made of a mixture of chemicals
  • when an electrical current is passed through, the crystal shape is modified
  • this changes the image seen on the screen
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8
Q

properties of nanomaterials

A
  • made out of nanoparticles
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9
Q

properties of carbon nanotubes

A
  • high strength to weight ratio
  • good conductors of heat and electricity
  • can be added to a material to strengthen it without adding much weight
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10
Q

properties of self cleaning fabrics

A

have a nanoparticle coating that removes odours and stains upon exposure to light

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11
Q

properties of antibacterial fabrics

A

use nanoparticles of silver to kill bacteria, also have medical uses like face masks and dressings

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12
Q

properties of coated metals

A
  • iron and steel can be galvanised to prevent rusting, they can also be elctroplated
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13
Q

what is anodised aluminium

A

has a coating of aluminium to make the surface harder and resistant to corrosion

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14
Q

PVC coated metals

A

metals like steel can be coated with PVC to make it corrosion resistant

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15
Q

what is a smart material

A

materials that change their properties in response to a stimuli

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16
Q

what are shape memory alloys

A

metal alloys that can remember their shape when heated

17
Q

examples of shape memory alloys

A
  • nitinol, used in glasses, if you bend them by accident and heat them in a bowl of hot water, and they’ll jump back into shape
  • braces also made using nitinol, are warmed up in the mouth and ‘pull’ on the teeth, so they move with the nitinol
18
Q

what are thermochromic pigments

A

used in colour changing products, they react to temperature
- when temperature increases, the product changes colour, the colour changes back when the object returns to its original temperature

19
Q

uses of thermochromic pigments

A

babies feeding spoons, so parents know the food isn’t too hot

20
Q

what are photochromic pigments

A

things that change colour in response to light

21
Q

examples of photochromic pigments

A

spectacle lesnes, go dark (turn into sunglasses) in dark light, but go back to bright when in light
- photochromic inks can be used to print t shirts with designs that only show in sunlight

22
Q

what are composite materials

A

a combination of two or more materials to improve properties

23
Q

examples of composite materials

A
  • Glass reinforced plastic (GRP)
  • Carbonfibre reinforced plastic (CRP)
24
Q

properties of GRP

A
  • Glass fibres coated in thermosetting plastic resin
  • strong
  • tough
  • heat resistant
  • easy to mould into complex shapes
25
Q

uses of GRP

A
  • Boats
    -Kayaks
  • PCBs
  • Surfboards
26
Q

properties of CRP

A
  • Carbon fibres coated in thermosetting plastic resin
  • lighter, tougher, stronger than GRP
  • more expensive
27
Q

CRP uses

A
  • protective helmets
  • bulletproof vests
  • racing cars
  • sports equipment
    -laptops
28
Q

what are technical textiles

A

enhanced fabrics, designed to be functional

29
Q

properties of Kevlar

A
30
Q

examples of technical fabrics

A
  • Nylon
  • Kevlar
  • Nomex
31
Q

properties of Kevlar

A
  • tightly woven fabric
  • great impact resistance
  • strong
  • resistant to abrasion
32
Q

Kevlar uses

A
  • bulletproof vests
  • motorcyclist clothing
  • used to reinforce tyres
33
Q

properties of Nomex

A
  • fire resistant
  • cant be washed or worn away
  • used in firefighters and racing drivers clothing
34
Q

properties of micro encapsulation fabrics

A
  • insect repellent
  • odour neutraliser
  • chemical coated in shells then embedded in fabric
35
Q

uses of micro encapsulation fabrics

A
  • antibacterial socks
  • scented lingerie
36
Q

properties of conductive fabrics

A
  • fibres that can conduct electricity
37
Q

uses of conductive fabrics

A

used to integrate electronics into clothing and in touchscreen gloves

38
Q

advantages of using composite materials in packaging

A
  • improved strength
  • improved insulation properties
  • improved resistance to water
39
Q

disadvantages of using composite materials for packaging

A
  • not biodegradeable
  • not always recycled so may end up in landfills
  • difficult to separate materials from each other for recycling at the end of their lives