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| '''Smart materials''' are materials that have one or more properties that can be significantly altered in a controlled fashion by external stimuli, such as ], temperature, moisture, ], ] or ] fields. | |||
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| There are a number of types of smart material, some of which are already common. Some examples are: | |||
| ] materials are materials that produce a voltage when stress is applied. Since this effect also applies in the reverse manner, a voltage across the sample will produce stress within the sample. Suitably designed structures made from these materials can therefore be made that bend, expand or contract when a voltage is applied. | |||
| Thermoresponsive materials, either ]s or shape memory polymers, are materials that can hold different shapes at various temperatures. | |||
| Magnetic shape memory alloys are materials that change their shape in response to a significant change in the magnetic field. | |||
| pH-sensitive (]) materials are commonly materials that change their colour as a result of changing acidity. One suggested application is for paints that can change colour to indicate ] in the metal underneath them. | |||
| ] change colour in response to electrical, optical or thermal changes. These include ] materials, which change their colour or opacity on the application of a voltage (e.g. ]s), ] materials with color depending on their temperature, and ] materials, which change colour in response to light - for example, light sensitive ] that darken when exposed to bright sunlight. | |||
| ==See also== | |||
| * ] | |||
| * ] | |||
| {{tech-stub}} | |||
| ] | |||
| ] | |||
| ] | |||
| ] | |||
Revision as of 09:56, 12 May 2006
dave is a gay