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Strange spaghetti crystals shrink when hot and wet

点击量:   时间:2019-03-15 09:19:01

A. Goodwin/Univ. of Oxford By Alison George Most materials expand when they absorb water or are exposed to heat, but some with a strange crystal structure do the opposite. Now it seems this counterintuitive behaviour is due to the formation of a tangled spaghetti structure within the crystal, a property that could lead to new anti-humidity building materials. Zirconium tungstate, a metal oxide, shrinks by around ten per cent when water is added or it is heated to very high temperatures. “It a remarkable material. It acts like a reverse sponge,