Company Allvar working with NASA on NTE space telescope optics; other applications are possible. A new material that shrinks when it is heated and expands when it is cooled could help enable the ultra ...
Most materials expand when they are heated, but some contract instead. A record value of this effect — known as negative thermal expansion — has now been observed in magnetic nanocrystals. Controlling ...
Materials expand when heated and contract when cooled because of temperature-induced changes in distances between molecules and atoms. Thermal expansion does not change overall structure of the ...
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