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In this article, an easy, effective, π-π conjugation non-covalent surface functionalization of multi-walled carbon nanotubes (MWCNTs) was achieved by using ball grinding technology between pristine MWCNTs and esterified styrene-maleic anhydride ester (ESMA) copolymer, resulting in the formation of modified E-MWCNTs dispersion with excellent dispersibility and long storage stability in N-methylpyrrolidone (NMP). The analysis of transmittance spectroscopy, absorption spectroscopy, sedimentation photo, and transmittance electron microscopy (TEM) confirms that the modified E-MWCNT dispersion has a homogeneous dispersion in NMP. Results obtained from thermogravimetry analysis (TGA) and Raman spectroscopy reveal that ESMA copolymer is successfully coated on pristine MWCNTs surface. Compared with the bad dispersibility of MWCNTs in NMP, the physically modified E-MWCNTs-3 dispersion mixed with 0.12wt% ESMA copolymer under the condition of total 6 h ball grinding time using paint shaker can be easily well-dispersed and has good storage stability, and no sedimentation is observed more than 3 months. Furthermore, the method is simple and economical to operate in industry. An easy, effective, π-π conjugation non-covalent surface functionalization of multi-walled carbon nanotubes (MWCNTs) was achieved by using ball grinding technology between pristine MWCNTs and esterified styrene-maleic anhydride ester (ESMA) copolymer, resulting in the formation of modified E-MWCNTs dispersion with excellent dispersibility and long storage stability reported firstly in N-methylpyrrolidone. [ABSTRACT FROM AUTHOR]

In this work, an easy, green, π-π conjugation non-covalent surface modification of pristine single-walled carbon nanotubes (SWCNT) was carried out by using ultrasonic technology between pristine SWCNT and anionic surfactant (sodium dodecyl benzene cyclate (SDBS) and sodium polynaphthalene sulfonate (SPS)), resulting in the formation of modified SWCNT dispersion with good dispersibility and long storage stability in water. Results obtained from transmittance spectroscopy, absorption spectroscopy, zeta potential analyzer, sedimentation photo, and transmittance electron microscopy (TEM) reveals that the modified SWCNT dispersion has a high degree of dispersion. The analysis of thermogravimetry analysis (TGA) and scanning electron microscope (SEM) confirm that two kinds of dispersants are successfully decorated on pristine SWCNT surface. More importantly, the pristine SWCNT is insoluble, while the modified S2-SWCNT dispersion mixed with 1.25 wt% SDBS and 1.00 wt% SPS correspondingly under the condition of total 3 h ultrasonic time can be easily well-dispersed in water and has good storage stability, and no sedimentation is observed more than 3 months. More importantly, this strategy is green and economical owing to its easy operation in industry. [ABSTRACT FROM AUTHOR]