In the US, a new method for creating ultralight airgel from nanowire
Scientists of the Livermore National Laboratory (USA) have developed a new ultralight airgel made of silver nanowire, which will certainly find application in power engineering and electronics.
Recently, foam metals (porous metals) have formed a new class of materials with unique properties – very low weight, extensive surface area, high electrical and low thermal conductivity.
However, conventional methods for the production of foam metals are very costly, since they require high temperature, pressure and anoxic environment. Scientists have found a way out of this situation by making blocks of silver nanowire. The airgel derived from it can change the density when exposed to its porous structure , which increases its electrical conductivity and mechanical properties.
Blocks made of silver nanowire are produced by synthesis of polyol and its purification by selective precipitation. To obtain the desired shape, the block is placed in an aqueous suspension, followed by thermal sintering to weld the nanowire joints .