smart materials Flashcards
what is the definition for smart materials?
Smart materials are materials that respond to environmental change but will go back to their original state.
are smart materials generally expensive or inexpensive?
expensive
what are the seven smart materials?
1.thermo-ceramics
2.shape memory alloys
3.reactive glass
4.liquid crystal displays
5.Photo-chromic materials
6.thermo-chromic materials
7.Quantum tunnelling composites
what smart material is very hard and very stable at high temperatures
Thermo ceramics
how are thermo-ceramics made?
ceramic and metallic powders are combined and placed in a die at high pressure until bonded
what is a disadvantage of thermo-ceramics?
if there are imperfections it can crack or break
what are some uses of ceramics
turbine blades and jet engines
which smart material can be deformed but returns to its original shape under a stimulus
Shape memory alloys
How are shape memory alloys made?
they are held in the desired shape then heated at very high temperatures.
what are some uses of shape memory alloys?
hot water systems, glasses and fire alarms
which smart material can exhibits liquid and solid crystal characteristics, when a voltage is applied it appears to go dark
Liquid Crystal Displays
what makes LCD’s useful for portable electronic devices?
requires very little power
what advance in LCD’s has made them very useful in laptops?
the ability to show full colour
what’s the name of the smart glass that turns clear to dark under a stimulus?
Reactive Glass
what happens when light shines on Reactive glass?
it turns dark
what is a use of reactive glass?
welding masks or blinds/Curtains replacement
what id the name of the material that changes colour according to light conditions?
Photo-chromic paint
what are some applications of Photo-chromic paint?
security markers or uv light sensors
what is the name of the material that changes colour base on temperature
Thermo-chromic Materials
what are some uses of Themo-chromic materials?
forehead thermometers
battery test panels, T-shirts, mugs
What is the name of the material that is a flexible polymer that conducts electricity under stress
Quantum Tunneling composites
how do quantum tunneling composites work?
it is a flexible polymer containing tiny metal particles that touch when the polymer is squeezed so that a current can pas through
what are some uses of QTC
membrane switches and pressure sensors e.g. in power tool switches
