Enriched surface acidity for surfactant-free suspensions of carboxylated carbon nanotubes purified by centrifugation.
It is well known that surfactant-suspended carbon nanotube (CNT) samples can be purified by centrifugation to decrease agglomerates and increase individually-dispersed CNTs. However, centrifugation is not always part of protocols to prepare CNT samples used in biomedical applications. Herein, using carboxylated multi-walled CNTs (cMWCNTs) suspended in water without a surfactant, we developed a Boehm titrimetric method for the analysis of centrifuged cMWCNT suspensions and used it to show that the surface acidity of oxidized carbon materials in aqueous cMWCNT suspensions was enriched by ~40% by a single low-speed centrifugation step. This significant difference in surface acidity between un-centrifuged and centrifuged cMWCNT suspensions has not been previously appreciated and is important because the degree of surface acidity is known to affect the interactions of cMWCNTs with biological systems.
Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA.
Elizabeth I
EI
Braun
Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA; Department of Biological Sciences, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA; Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA.
Rockford
R
Draper
Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA; Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080-3021, USA.
Paul
P
Pantano
Boehm titration; Carbon nanomaterial sample preparation; Nanomedicine; Nanotoxicology; Oxidized multi-walled carbon nanotube
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