smart materials

Question 1

phosphorescent pigment

Answer 1

• absorbs light during the day and re-emits it when dark
• exit signs
• glow in the dark products

Question 2

photochromic pigment

Answer 2

• changes colour with light intensity
• welding goggles
• security markers that show under UV light

Question 3

piezoelectric material

Answer 3

• gives off a small electrical charge when deformed
• increases in size when electrical current is passed through
• airbag sensors
• pressure sensors
• musical greetings cards

Question 4

shape memory alloys

Answer 4

• change shape in response to a change in temperature or electrical input
• dental braces
• bioengineering

Question 5

electroluminescent wire

Answer 5

• thin copper wire coated in a phosphorescent material that glows in response to alternating current
• glow bracelets
• outdoor decorative lighting

Question 6

thermochromic pigment

Answer 6

• changes colour in response to temperature change
• thermometers
• baby bottles