dt 1.3 smart materials

polymorph

-can be reshaped many times

-when warmed to 62 degrees it becomes flexible and easy to mould

-sets and cools to becomes stiff and strong

uses of polymorph

-ergonomic handles

-prototype mechanical parts

-making mouldings

shape memory alloy (SMA)

-group of materials that go back to their original shape after being deformed by heat.

-super elasticity

Uses of SMA

-Nitinol is used for braces

-vascular surgery (treating blocked arteries)

Quantum tunnelling composite (QTC)

-flexible polymer with tiny metal particle embedded into it

-when squeezed, pressure forces particles together and a current of electrons flows between the neighbouring particles

Uses of QTC

-microswitches

-outdoor items that may be affected by water and touch sensitive pads

Thermochromic materials

-temperature sensitive

-change colour at different temperatures

Uses of thermochromic materials

-incorporated into inks

Photochromic materials

-changes colour when exposed to UV light

-pigment eventually degrade from over exposure of UV light

Uses of photochromic materials

-glasses (lens darken when exposed to light and reverse to colourless once removed from UV source)

-novelty toys

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