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Surfactant-based dispersant for multiwall carbon nanotubes to prepare ceramic composites by a sol-gel method.

Summary of "Surfactant-based dispersant for multiwall carbon nanotubes to prepare ceramic composites by a sol-gel method."

A dispersant for multiwall carbon nanotubes (MWCNTs) is proposed that fulfils the requirements of creating a uniform dispersion in the matrix and obtaining a good interface between CNTs and the matrix, and is soluble in generic nonpolar solvents. This dispersant is based on a long chain surfactant, called in this work dabcosil stearate, containing a stearate-based 18-carbon alkyl chain as an anion, and a silsesquioxane containing a bridged, positively charged 1,4-diazoniabicyclo[2.2.2]octane group. It provides not only a very good dispersion medium for the MWCNTs, but also a very good interface between MWCNTs and ceramic matrices, such as alumina and zirconia, prepared by the sol-gel method.

Affiliation

Instituto de Física, Universidade Federal do Rio Grande do Sul , PO Box 15051, CEP 91501-970 Porto Alegre, RS Brazil.

Journal Details

This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
Pages: 1447-52

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