The first experimental group received MWCNTs (MWCNT-1) with a diameter of 8–10 nm and specific surface of 400 m2/g, and the coexisting impurities in its structure were 0.6% Fe, 0.3% Co and 0.9% Al. Open field testing data obtained for MWCNT-1 by our group has previously been published (12 (link)). The second experimental group received MWCNTs (MWCNT-2) with a diameter of 18–20 nm and specific surface of 130 m2/g, and the coexisting impurities were 0.2% Fe, 0.12% Co, 0,004% Ca and 0.08% Cl in its structure. The two types of MWCNT represented aggregates with sizes from 5–100 µm.
Characterization of the materials and their structure was performed using an S-3400N scanning electron microscope (Hitachi, Ltd., Tokyo, Japan) and Ultra Dry energy dispersive spectrometer (Thermo Fisher Scientific, Inc., Waltham, MA, USA). Metal impurities were assessed using X-ray fluorescence analysis (XrFA). The wave dispersive X-ray fluorescence spectrometer ARL Advant'x 3600 (Thermo Fisher Scientific, Inc.) was used to conduct the XrFA of the MWCNTs. Instrumental control was possible with the use of OXSAS software, version 1.5.
The S-3400N scanning electron microscope and the Ultra Dry spectrometer were used for assessment of the nanotube aggregates.
Characterization of the materials and their structure was performed using an S-3400N scanning electron microscope (Hitachi, Ltd., Tokyo, Japan) and Ultra Dry energy dispersive spectrometer (Thermo Fisher Scientific, Inc., Waltham, MA, USA). Metal impurities were assessed using X-ray fluorescence analysis (XrFA). The wave dispersive X-ray fluorescence spectrometer ARL Advant'x 3600 (Thermo Fisher Scientific, Inc.) was used to conduct the XrFA of the MWCNTs. Instrumental control was possible with the use of OXSAS software, version 1.5.
The S-3400N scanning electron microscope and the Ultra Dry spectrometer were used for assessment of the nanotube aggregates.