Universität zu Köln

Roeder, Lisa, Bender, Philipp ORCID: 0000-0002-2492-3956, Kundt, Matthias, Tschoepe, Andreas and Schmidt, Annette M. (2015). Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels. Phys. Chem. Chem. Phys., 17 (2). S. 1290 - 1299. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

Particle-crosslinked polymer composites and gels have recently been shown to possess novel or improved properties due to a covalent particle-matrix interaction. We employ spindle-like hematite particles as exclusive crosslinkers in poly(acrylamide) gels, and exploit their extraordinary magnetic properties for the realization of ferrohydrogels with a perpendicular orientation of the preferred magnetic and geometric axes of the particles. The angle-dependent magnetic properties of uniaxially oriented gels are investigated and interpreted with respect to particle-matrix interactions. The impact of the particle orientation on the resulting angle-dependent magnetic performance reveals the presence of two different contributions to the magnetization: a hysteretic component ascribed to immobilized particles, and a pseudo-superparamagnetic, non-hysteretic component due to residual particle mobility. Furthermore, a plastic reorientation of magnetic particles in the matrix when subjected to a transversal field component is observed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Roeder, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Bender, Philipp UNSPECIFIED orcid.org/0000-0002-2492-3956 UNSPECIFIED Kundt, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Tschoepe, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-419628
DOI:	10.1039/c4cp04493b
Journal or Publication Title:	Phys. Chem. Chem. Phys.
Volume:	17
Number:	2
Page Range:	S. 1290 - 1299
Date:	2015
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1463-9084
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NEMATISCHEN KRISTALLINFLUSSIGEN PHASE; MOLEKULAR-STATISTISCHE THEORIE; CORE-SHELL PARTICLES; HEMATITE NANOPARTICLES; LIQUID-CRYSTALS; COBALT FERRITE; SHEAR MODULUS; HYDROGELS; MODEL; NANORODS Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41962