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Facile Alignment of Carbon Nanotubes Mediated by Tethered Maghemite Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Il Tae Kim ,
Grady A Nunnery ,
Karl I Jacob ,
Justin Schwartz ,
Xiaotao Liu  and
Rina Tannenbaum
Il Tae Kim
Affiliation:
iltae.kim@gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, Atlanta, Georgia, United States
Grady A Nunnery
Affiliation:
nunnery@gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, Atlanta, Georgia, United States
Karl I Jacob
Affiliation:
karl.jacob@ptfe.gatech.edu, Georgia Institute of Technology, Polymer, Textile and Fiber Engineering, Atlanta, Georgia, United States
Justin Schwartz
Affiliation:
Justin_Schwartz@ncsu.edu, Florida State University, Mechanical Engineering, Tallahassee, Florida, United States
Xiaotao Liu
Affiliation:
liuxt@asc.magnet.fsu.edu, Florida State University, Mechanical Engineering, Tallahassee, Florida, United States
Rina Tannenbaum
Affiliation:
rinatann@mse.gatech.edu, Georgia Institute of Technology, Materials Science and Engineering, Atlanta, Georgia, United States
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Abstract

We describe a novel, facile method for the alignment of multi-walled carbon nanotubes (MWNTs) in a magnetic field facilitated by the decoration of the MWNTs with monodisperse γ-Fe2O3 magnetic (maghemite) nanoparticles. The tethering of the nanoparticles was achieved by the attachment of γ-Fe2O3 nanoparticles that were synthesized using a modified sol-gel process, onto the carboxylate-activated MWNTs. Sodium dodecylbenzene sulfonate (NaDDBS) was used to prevent the formation of an iron oxide 3D network. Various characterization methods were employed to confirm the formation of homogeneously-distributed and nearly-monodispersed iron oxide nanoparticles, and show that they were indeed tethered to the walls of the MWNTs. The γ-Fe2O3 nanoparticles imparted magnetic characteristics to the MWNTs, which in turn, were oriented parallel to the direction of an externally-applied magnetic field. This facile alignment of MWNT could promote the enhancement of various properties, e.g. mechanical and electrical properties, of the resulting composites. Moreover, this facile alignment at low magnetic fields, made possible by the magnetization of the carbon nanotubes through the tethering of maghemite nanoparticles, may be applied to a variety of other useful nanofillers, such a glass fibers, clay nanoparticles and cellulose nanowhiskers.

Keywords

nanostructuremagnetic propertiessol-gel
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1258: Symposia P/Q/R – Low-Dimensional Functional Nanostructures-Fabrication, Characterization and Applications , 2010 , 1258-R04-05
Copyright
Copyright © Materials Research Society 2010

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