Magnetic and geometric anisotropy in particle-crosslinked ferrohydrogels
| Autor: | Andreas Tschöpe, Matthias Kundt, Philipp Bender, Annette M. Schmidt, Lisa Roeder |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Field (physics) Component (thermodynamics) Magnetic Phenomena Acrylic Resins General Physics and Astronomy Hydrogels Hematite Quantitative Biology::Subcellular Processes Condensed Matter::Soft Condensed Matter Magnetization Nuclear magnetic resonance Chemical physics visual_art Perpendicular visual_art.visual_art_medium Anisotropy Particle Magnetic nanoparticles Physical and Theoretical Chemistry Magnetite Nanoparticles |
| Zdroj: | Physical Chemistry Chemical Physics. 17:1290-1298 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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