Piezoelectric devices
Devices that either generate electricity when loaded, or change shape/size with a useful force when connected to an electronic circuit.
Liquid crystals
Carbon-based crystals that can have their orientation changed when an electric current is passed through them.
Phospherescent pigments
Ceramic powders that have the ability to absorb light & then release the light energy over a long period of time. They can be mixed with acrylic paints/inks for creating illuminated signs that do not require an additional power source.
Shape memory alloy
Metal alloys specially developed to 'remember' their shape under specific conditions.
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