NPL, in collaboration with international partners, has developed an ISO/IEC standard, ISO/TS 21356-1:2021, for measuring the structural properties of graphene, typically sold as powders or in a liquid dispersion. The ISO/IEC standard allows the supply chain to answer the question ‘what is my material?” and is based on methods developed with The University of Manchester in the NPL Good Practice Guide 145.
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Source: Phys.org