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Jpn. J. Appl. Phys. 46 (2007) pp. 2799-2805  |Previous Article| |Next Article|  |Table of Contents|
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Lipid-Modulated Assembly of Magnetized Iron-Filled Carbon Nanotubes in Millimeter-Scale Structures

Nashville C. Toledo, Maurits R. R. de Planque, Sonia Antoranz Contera, Nicole Grobert1, and John F. Ryan

Bionanotechnology IRC, Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom

(Received September 19, 2006; accepted November 21, 2006; published online April 24, 2007)

Biomolecule-functionalized carbon nanotubes (CNTs) combine the molecular recognition properties of biomaterials with the electrical properties of nanoscale solid state transducers. Application of this hybrid material in bioelectronic devices requires the development of methods for the reproducible self-assembly of CNTs into higher-order structures in an aqueous environment. To this end, we have studied pattern formation of lipid-coated Fe-filled CNTs, with lengths in the 1–5 µm range, by controlled evaporation of aqueous CNT-lipid suspensions. Novel diffusion limited aggregation structures composed of end-to-end oriented nanotubes were observed by optical and atomic force microscopy. Significantly, the lateral dimension of assemblies of magnetized Fe-filled CNTs was in the millimeter range. Control experiments in the absence of lipids and without magnetization indicated that the formation of these long linear nanotube patterns is driven by a subtle interplay between radial flow forces in the evaporating droplet, lipid-modulated van der Waals forces, and magnetic dipole–dipole interactions.

URL: http://jjap.jsap.jp/link?JJAP/46/2799/
DOI: 10.1143/JJAP.46.2799


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