Methods for measuring carbon single-walled nanotube content of carbon soot
OwnerAvetik Harutyunyan, Toshio Tokuneinventors
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Abstract
Methods and processes for quantitating the carbon single-walled nanotubes (SWNTs) content in a sample are disclosed. The SWNTs soot can be produced by any of the known methods. The magic angle spinning (MAS) 13C NMR of a sample suspected of containing SWNTs and a standard at a known concentration are obtained, and the areas under the curve for the sample and the standard are calculated. Thereby, the concentration of 13C atoms involved in the formation of carbon SWNTs are calculated. Finally, by taking into account the natural distribution of 13C isotopes (about 1.1%), the total concentration of all carbon atoms responsible for the formation of SWNTs are calculated.
Claims8
A method for determining the concentration of single-walled carbon nanotubes (SWNTs) in a sample, the method comprising:
- obtaining 13C NMR of a sample comprising SWNTs and a known concentration of a standard;
- calculating the area under the curve for the 13C NMR signal for SWNTS and the 13C NMR signal for the standard;
- and
- determining the concentration of SWNTs by comparing the area under the curve for the sample signal and the standard signal.
Dependencies are inferred from the claim text.