How can metals be used as liquid in the mirrors?
As mentioned before, the principle metal used in liquid mirrors is mercury. Several of other metallic candidates were examined, such as ionic liquid coated with silver, which wouldn’t evaporate even in vacuum, allowing the use of it off-Earth (Angel et al., 2008). Another material proposed is made of magnetic iron particles, ethylene glycol, and a coating of silver nanoparticles, which “showed better reflectivity and stability†than mercury (American Chemical Society, 2008, para. 6).
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