Reference : Synthesis and characterization of uniaxial ferrogels with Ni nanorods as magnetic phase
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/3905
Synthesis and characterization of uniaxial ferrogels with Ni nanorods as magnetic phase
English
Bender, Philipp [Universität des Saarlandes, Saarbrücken, Germany > Technische Physik]
Günther, Annegret mailto [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]
2011
Journal of Magnetism & Magnetic Materials
Elsevier Science
323
2055-2063
Yes (verified by ORBilu)
0304-8853
Amsterdam
The Netherlands
[en] Ferrogel ; Nanorod ; Nanomagnetism ; Porous alumina ; Shape anisotropy
[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.
http://hdl.handle.net/10993/3905
10.1016/j.jmmm.2011.03.016

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