Article (Scientific journals)
Synthesis and characterization of uniaxial ferrogels with Ni nanorods as magnetic phase
Bender, Philipp; Günther, Annegret; Tschöpe, Andreas et al.
2011In Journal of Magnetism and Magnetic Materials, 323, p. 2055-2063
Peer reviewed
 

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Keywords :
Ferrogel; Nanorod; Nanomagnetism; Porous alumina; Shape anisotropy
Abstract :
[en] In the present study, the rotation of magnetic nanorods in a soft hydrogel matrix induced by a homogeneous magnetic field is investigated. Magnetic nanorods of ≈151.2 nm length and ≈17.7 nm diameter are synthesized via current-pulsed electrodeposition of nickel into porous aluminum oxide-templates. The nanorods are processed towards a stable colloidal dispersion by dissolution of the alumina template in aqueous NaOH to which PVP (polyvinyl-pyrrolidone) is added as surfactant. These suspensions are used to prepare gelatine-based ferrogels of different shear modulus with either isotropic or uniaxial orientation-distribution of the nanorods. While magnetization measurements of rigid ferrogels mainly reflect the magnetic properties of the nickel nanorods, the magnetization behavior of soft ferrogels is significantly influenced by a field-induced rotation of the nickel nanorods in the low compliant matrix. A particular analysis of magnetization measurements on uniaxial ferrogels enables to quantify the rotation angle of the nanorods with respect to their initial orientation under the influence of a transversal homogeneous magnetic field. The analysis of the field-dependent rotation also allows to estimate the local shear modulus of the matrix which is demonstrated by an investigation of room temperature ageing process of the ferrogel.
Disciplines :
Physics
Author, co-author :
Bender, Philipp;  Universität des Saarlandes, Saarbrücken, Germany > Technische Physik
Günther, Annegret ;  Universität des Saarlandes, Saarbrücken, Germany > Technische Physik
Tschöpe, Andreas;  Universität des Saarlandes, Saarbrücken, Germany > Technische Physik
Birringer, Rainer;  Universität des Saarlandes, Saarbrücken, Germany > Technische Physik
Language :
English
Title :
Synthesis and characterization of uniaxial ferrogels with Ni nanorods as magnetic phase
Publication date :
2011
Journal title :
Journal of Magnetism and Magnetic Materials
ISSN :
0304-8853
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
323
Pages :
2055-2063
Peer reviewed :
Peer reviewed
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