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Surface Oxidation of Single Wall Carbon Nanohorns for the Production of Surfactant Free Water-Based Colloids

Filippo Agresti, Simona Barison, Alessia Famengo, Cesare Pagura, Laura Fedele, Stefano Rossi, Sergio Bobbo, Marzio Rancan, Monica Fabrizio

J Colloid Interface Sci. 2018 Mar 15;514:528-533.

PMID: 29289735

Abstract:

In this work, powders of Single Wall Carbon Nanohorns (SWCNHs), a typical hydrophobic material, were oxidized with concentrated HNO3 with the aim of surface carboxylation and consequent improved hydrophilicity and dispersibility in polar solvents. Dynamic Light Scattering and ζ-potential measurements demonstrated that very stable colloidal suspensions of SWCNH in water were obtained in total absence of stabilizers. By properly optimizing the reaction parameters, the suspensions achieved stability even higher than colloids with similar composition but prepared with the use of surfactants. Surface damage and oxidation degree of SWCNHs were evaluated by SEM microscopy, Thermogravimetric Analysis, Residual Gas Analysis, XPS and UV-visible spectroscopy.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
LS76102 Carbon nanohorns, oxidized Carbon nanohorns, oxidized Price
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