Other teams have come up with similar devices before, although no one was able to create something that didn’t rely on exotic materials or a complex fabrication process. IBS team stayed away from carbon nanotubes and gold and looked at a more utilitarian option for their build material: thin slivers of silver nanowires ∼150 nm in diameter and ∼30 μm in length (a human hair ranges from 17 – 181 µm). The nanowires were mixed into a liquid elastic material which is both soft and stretchy when dry.
To ensure that the material remains tight on the target area while heating, the team devised a 2D interlocking coil pattern for the mesh structure. To make the mesh, the liquid mixture was poured into a shaped mold. The silver-elastic mesh was sandwiched between a top and bottom layer of soft, thin insulation.
(Left: mesh in a relaxed state Right: Mesh stretched over a curve to 100%)
>>In material flexibility tests, while placed on knee and wrist joints, the mesh heated while deformed and under stress on knee and wrist joints. It is lightweight, breathable and generates heat over the entire surface area of the material. The mesh maintains a constant temperature instead of cooling down during use and is battery powered so it doesn’t need an outlet.
Beyond thermotherapy, the applications are endless. This technology could be used as a lightweight heating element in ski jackets, or as a hyper-efficient seat warmer in a car. Although only flat mesh connected into a tube has been made so far, it isn’t a stretch to imagine creating more intricate designs like the shape of a hand with detailed fingers. http://www.ibs.re.kr/cop/bbs/BBSMSTR_000000000611/selectBoardArticle.do?nttId=11727&kind=&mno=sitemap_02&pageIndex=1&searchCnd=&searchWrd=
In material flexibility tests, while placed on knee and wrist joints, the mesh heated while deformed and under stress on knee and wrist joints. It is lightweight, breathable and generates heat over the entire surface area of the material.
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