Surfactant-based dispersant for multiwall carbon nanotubes to prepare ceramic composites by a sol-gel method.
| Autor: | Silva PR; Instituto de Física, Universidade Federal do Rio Grande do Sul, PO Box 15051, CEP 91501-970 Porto Alegre, RS Brazil., Almeida VO, Machado GB, Benvenutti EV, Costa TM, Gallas MR |
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| Jazyk: | angličtina |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2012 Jan 17; Vol. 28 (2), pp. 1447-52. Date of Electronic Publication: 2011 Dec 20. |
| DOI: | 10.1021/la203056f |
| Abstrakt: | 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. (© 2011 American Chemical Society) |
| Databáze: | MEDLINE |
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