Researchers at Michigan State University have described the first known liquid that acts as
Physicists discovered unusual properties by working withionic liquids. These are salts that remain liquid at unusually low temperatures (below the boiling point of water). Composed only of positively and negatively charged ions, the material is a viscous structure that resembles machine oil or maple syrup.
The study showed that when ionic liquidsplaced in a cylinder and compressed by a piston, they generated electricity proportional to the applied force. Scientists also found the opposite effect: the optical properties of ionic liquids changed under the influence of an electric current. For example, when the researchers placed these liquids in a lens-shaped container, they found that an electrical charge could change the focal length.
Piezoelectricity has been known to scientists since the 19th century, butall traditional studies have studied only solids. They emit electricity under pressure, and under the influence of electricity they can change shape. Physicists do not yet understand exactly how the piezoelectric effect occurs in ionic liquids. They will continue research to uncover the nature of this phenomenon.
Regardless of the result, researchersIt is believed that the new properties of ionic liquids can be used to create new applied areas: optical and hydraulic devices controlled by electricity. In addition, harmless liquids can replace toxic classical lead piezoelectrics.
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