Comparatively studying the ultrasound present in a mild two-stage approach on the content of functional groups in modified MWCNT

The variation of oxygen-containing functional groups grafted on MWCNT with carboxyl and hydroxyl groups, which are marked by an elliptical region and rectangular region, respectively. Atoms in black, red and green represent the active cites of carbon atoms, CO groups and CO groups, while the hydrogen atoms are not displayed.