GB/T 24490-2009 Translated English of Chinese Standard (GB/T 24490-2009, GBT24490-2009): Test method for purity of multi-walled carbon nanotubes
https://www.chinesestandard.net, 18.6.2023 - 15 sivua
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.
absolute deviation according to formula air atmosphere Analytical procedures ash content mass ash content measured Ash content wh1 average ash content average value average variance C/min Calculate the average calculation method carbon fibers carbon nanotube samples carbon phase content carbon phase impurities carbon shells carbon spheres characteristic parameters charcoal analysis charcoal burning content mass fraction crucible cubic nanometers nm3 cylinder desiccator field of view GB/T Geometric model grams g graphite flakes heating rate image analysis meanwhile measured by TGA measuring the purity microgrid milligrams mg muffle furnace multi multi-walled carbon nanotubes nanometers nm observation and image obtained by charcoal oxidation phase content mass proportion of multi-walled purity of multi-walled Results presentation method room temperature sample preparation set of TGA Short tube shown in Figure spherical shell TGA analysis TGA measurements thermogravimetric analyzer total volume V1 transmission electron microscope V1 of multi-walled V2 of carbon value and average walled carbon nanotubes