1.11 Smart Materials Flashcards

1
Q

Describe smart materials

A

Materials whose physical properties change in response to an input or change in the environment, such as electricity, pressure, temperature or light.

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2
Q

How does SMAs work?

A

Changes shape in a response to a change in temperature or electrical input

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3
Q

State two uses of SMAs

A
  • Dental braces
  • Self-closing windows
  • Aeroplane wing flaps
  • Bioengineering, such as stents, bone plates, screws
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4
Q

How does thermochromic pigment work?

A

Changes colour in response to temperature

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5
Q

State three uses of thermochromic pigment

A
  • Room thermometers
  • Medical thermometers, for children
  • Bath water thermometers
  • Colour change mugs and kettles
  • Food packaging
  • Baby feeding spoons
  • Battery charge indicator strips
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6
Q

How does phosphorescent pigment work?

A

Absorb light energy during the day and ‘re-emits’ the light energy when it is dark

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7
Q

State two uses of phosphorescent pigment

A
  • Fire exits signs

- ‘Glow in the dark’ products, such as adhesive stars, masks, night lights, and watch bands

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8
Q

How does photochromic pigment work?

A

Changes colour with light intensity

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9
Q

State two uses of photochromic pigment

A
  • Welding goggles
  • Reactive spectacle lenses
  • Security marker that shows up under UV light
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10
Q

How does electroluminescent wire work?

A

Thin copper wire coated in a phosphorescent material that glows in response to an alternating current

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11
Q

State two uses electroluminescent wire

A
  • Glow bracelets
  • Interweaving for clothing
  • Home decoration
  • Outdoor decoration lighting
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12
Q

How does piezoelectric material work?

A

Gives off a small electrical charge when deformed

Increase in size (up to 4%) when an electrical current passed through it

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13
Q

State two uses piezoelectric material

A
  • Airbag sensors in cars
  • Vibration damping in tennis racquets
  • Lighters for barbecues
  • Musical greeting cards
  • Pressure sensors
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