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Bender P, Günther A, Honecker D, et al. Excitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE. Nanoscale. 2015;7(40):17122-30doi: 10.1039/c5nr04243g.
Bender, P., Günther, A., Honecker, D., Wiedenmann, A., Disch, S., Tschöpe, A., Michels, A., & Birringer, R. (2015). Excitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE. Nanoscale, 7(40), 17122-30. https://doi.org/10.1039/c5nr04243g
Bender, Philipp, et al. "Excitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE." Nanoscale vol. 7,40 (2015): 17122-30. doi: https://doi.org/10.1039/c5nr04243g
Bender P, Günther A, Honecker D, Wiedenmann A, Disch S, Tschöpe A, Michels A, Birringer R. Excitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE. Nanoscale. 2015 Oct 28;7(40):17122-30. doi: 10.1039/c5nr04243g. Epub 2015 Oct 01. PMID: 26426484.
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Nanoscale. 2015 Oct 28;7(40):17122-30. doi: 10.1039/c5nr04243g. Epub 2015 Oct 01.

Excitation of Ni nanorod colloids in oscillating magnetic fields: a new approach for nanosensing investigated by TISANE.

Nanoscale

Philipp Bender, Annegret Günther, Dirk Honecker, Albrecht Wiedenmann, Sabrina Disch, Andreas Tschöpe, Andreas Michels, Rainer Birringer

Affiliations

  1. Experimentalphysik, Universität des Saarlandes, Postfach 151150, Geb. D2 2, D-66041 Saarbrücken, Germany. [email protected].

PMID: 26426484 DOI: 10.1039/c5nr04243g

Abstract

The response of a colloidal dispersion of Ni nanorods to an oscillating magnetic field was characterized by optical transmission measurements as well as small-angle neutron scattering (SANS) experiments using the TISANE (Time-dependent SANS experiments) technique. Exposed to a static magnetic field, the scattering intensity of the rod ensemble could be well described by the cylinder form factor using the geometrical particle parameters (length, diameter, orientation distribution) determined by transmission electronmicroscopy and magnetometry. An oscillation of the field vector resulted in a reorientation of the nanorods and a time-dependency of the scattering intensity due to the shape anisotropy of the rods. Analysis of the SANS data revealed that in the range of low frequencies the orientation distribution of the rods is comparable to the static case. With increasing frequency, the rod oscillation was gradually damped due to an increase of the viscous drag. It could be shown that despite of the increased friction in the high frequency range no observable change of the orientation distribution of the ensemble with respect to its symmetry axis occurs.

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