If one end of a piece of metal is kept over fire, you probably don't want to hold the other end in your hand. This is because conductors of electricity also conduct heat. Yet, here, Dr. Alireza Nojeh reports on an unusual and counter-intuitive phenomenon called Heat Trap, whereby heat stays confined to a region of a conductor, without spreading to the surroundings. This effect was observed in carbon nanotubes forests (arrays of many many aligned carbon nanotubes forming a bulk structure) by his researc
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