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Ferrofluid mirror
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Ferrofluid mirror : ウィキペディア英語版
Ferrofluid mirror

Ferrofluid mirrors are commonly used in adaptive optics as a deformable mirror. They are made of a ferrofluid that uses electromagnets to change its shape.
==Applications in Astronomy==
Ferrofluid mirrors can be used in telescopes. The telescopes must be facing directly up, for gravity must act equally on all parts of the mirror to distribute the fluid evenly, though magnets hold it in place. Recently, researchers at Université Laval in Québec, Canada working with Jean-Philippe Déry, Ermanno Borra, and Anna Ritcey have created a new ferrofulid using ethylene glycol — the antifreeze used in our cars — mixed with maghemite, an iron oxide. Before antifreeze was modified for this use, mercury was the preferred fluid. Ethylene glycol, when sprayed with small silver particles, becomes smoother than mercury, making it a better mirror. 〔(Telescope Mirrors from Antifreeze? )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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