p1-smart materials

Question 1

Shape Memory Alloy (SMA)

Answer 1

-can change in response to temperature or electrical input

. uses: braces, self-closing windows, screws

Question 2

Thermochromic Pigment

Answer 2

-changes colour in response to temperature change

.uses: Room thermometers, medical thermometers, colour changing mugs, plates, cutlery for babies etc

Question 3

Phosphorescent pigment

Answer 3

• absorbs light energy during the day and re-emits the light when dark

uses: fire-exit signs, night lights, ‘glow-in-dark’ products

Question 4

photochromic pigment

Answer 4

-changes colour with light intensity

uses: welding goggles, reactive glasses lenses,
security markers

Question 5

Electroluminescent wire

Answer 5

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

uses: glow bracelets, interweaving in clothes, home and outdoor decorations

Question 6

piezoelectric material

Answer 6

-gives off a small electrical charge when deformed

• increase in size when electrical current is passed through it

uses: airbag sensors in car, lighters for barbeques, pressure sensors