Devices having a volume-displacing ferrofluid piston
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United States of America Patent
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Jan 23, 2018
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app pub date -
Dec 3, 2015
filing date -
Dec 3, 2015
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Abstract
A device for use in compressing or expanding a working fluid, such as a gas, includes a container, a piston, working fluid, ferrofluid, and at least one magnetic component. The piston includes a piston face. The piston face and the container define an interior cavity having a volume that varies in response to movement of the piston relative to the container. The working fluid and the ferrofluid are contained in the interior cavity. The at least one magnetic component has a magnetic field that exerts magnetic forces on the ferrofluid that stabilize the ferrofluid in a subset of the interior cavity. This displaces the working fluid within the interior cavity.
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