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Measurements conducted using the SMPS or the ELPI show clearly that CNT aerosol can be generated in large concentrations by nebulising CNT dispersions. This was demonstrated for spinnable MWCNT of 10nm diameter as well as for coarser MWCNT from a different growth process with diameters ranging from 50nm to 100nm. SEM images of MWCNT objects collected by the ELPI Page iv of 75 provide evidence of significant differences between the morphologies of agglomerates formed by the fine and the coarse MWCNT. The aerosol characterisation work was undertaken in the test duct at very high concentrations of CNT in nitrogen (5·105 structures per cm3), with limited background contamination and variation in background particle levels.
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