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See Chinese contents: GB/T 24490-2009 GB/T 24490-2009: Test method for purity of multi-walled carbon nanotubes
This standard specifies the method, instrument, analysis procedure, result presentation method for measuring the purity of multi-walled carbon nanotubes. This standard provides a method for measuring the purity of multi-walled carbon nanotubes (MWCNTs) samples, using a combination of charcoal burning, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), image analysis. The purity is represented by the content (mass fraction) of multi-walled carbon nanotubes in the sample. This standard is not applicable to samples, which have poor uniformity OR contain large carbon phase impurities.
