What are the two ways in which Piezoelectric materials work?

• Subject it to movement or stress and it produces electricity; Attach an electrical signal to it and it moves.

• Subject it to heat and it produces sound; Attach a magnetic field to it and it vibrates.

• Submerge it in water and it generates pressure; Connect it to a battery and it glows.

• Expose it to light and it creates heat; Connect it to a capacitor and it stores energy.

What are smart materials designed to react to?

• Internal Conditions

• External Stimuli

• Static Forces

• Chemical Reactions

What are the uses of Piezoelectric materials?

• Keypad sensors, alarm systems and microphones.

• Solar panels and wind turbines.

• Water purification systems.

• Thermal insulation materials.

What do they alter in a response to a change in the environment?

• Their function or aesthetic properties

• Only their aesthetic properties

• Only their function

• Their color and texture

What is self healing concrete designed to do?

• Designed to avoid stress cracks filling with water.

• Designed to enhance the strength of concrete

• Designed to reduce the weight of concrete

• Designed to improve the color of concrete

What is the main property of a Thermochromic?

• Change colour when temperature changes.

• Remain the same color regardless of temperature.

• Change shape when temperature changes.

• Absorb heat without changing color.

What is a Photochromic?

• A material that changes colour when exposed to different UV levels.

• A type of lens that blocks all light.

• A chemical that glows in the dark.

• A material that becomes transparent when heated.

What are the uses of Self Healing Concrete?

• Construction and engineering materials.

• Artistic sculptures and decorations.

• Household cleaning products.

• Agricultural fertilizers.

What can some of the stimuli include?

• Pressure, Electricity, Moisture, PH level

• Temperature, Sound, Gravity, Vibration

• Color, Shape, Size, Texture

• Taste, Smell, Flavor, Aroma

What is a self healing polymer?

• A polymer that can change color when exposed to heat.

• A polymer that reacts to stress fractures by releasing a resin into the new crack.

• A polymer that can conduct electricity when stretched.

• A polymer that becomes stronger when exposed to water.