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A "smart material" is one having a molecular structure that responds in a particular and controlled way to influences upon it. Some types of smart materials are piezoelectrics, electrostrictors, magnetostrictors, and shape-memory alloys.

Piezoelectric materials generate an electrical charge when stimulated, as by contact, or respond to an electric current by changing shape. Strictors change shape in response to an electric or magnetic field. A shape-memory alloy (SMA) can "remember" a hot or cold form and return to it after being changed in shape.

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Q: What are some types of smart materials?
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