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Issue 35, 2013
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Collective alignment of nanorods in thin Newtonian films

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Abstract

In this paper, we provide a complete analytical description of the alignment kinetics of magnetic nanorods in magnetic field. Nickel nanorods were formed by template electrochemical deposition in alumina membranes from a dispersion in a water–glycerol mixture. To ensure uniformity of the dispersion, the surface of the nickel nanorods was covered with polyvinylpyrrolidone (PVP). A 40–70 nm coating prevented aggregation of the nanorods. These modifications allowed us to control alignment of the nanorods in a magnetic field and test the proposed theory. An orientational distribution function of nanorods was introduced. We demonstrated that the 0.04% volume fraction of nanorods in the glycerol–water mixture behaves as a system of non-interacting particles. However, the kinetics of alignment of a nanorod assembly does not follow the predictions of the single-nanorod theory. The distribution function theory explains the kinetics of alignment of a nanorod assembly and shows the significance of the initial distribution of nanorods in the film. It can be used to develop an experimental protocol for controlled ordering of magnetic nanorods in thin films.

Graphical abstract: Collective alignment of nanorods in thin Newtonian films

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Publication details

The article was received on 25 May 2013, accepted on 12 Jul 2013 and first published on 15 Jul 2013


Article type: Paper
DOI: 10.1039/C3SM51467F
Citation: Soft Matter, 2013,9, 8532-8539
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    Collective alignment of nanorods in thin Newtonian films

    Y. Gu, R. Burtovyy, J. Townsend, J. R. Owens, I. Luzinov and K. G. Kornev, Soft Matter, 2013, 9, 8532
    DOI: 10.1039/C3SM51467F

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