Polarised SANS measurements on hybrid ferrofluidic dispersions
Viscoelastic and magnetoviscous phenomena in ferrofluids are closely related to their internal microstructure. For sufficiently strong magnetic fields, chain-like aggregates may form in highly concentrated ferrofluids, which goes together with an increase of viscosity, the so-called magnetoviscous effect. In addition, shear-induced degradation of the field-induced structures is observed, which apparently is related to strong shear thinning behaviour. A promising approach towards improved, shear-resistant magnetoviscous material is the integration of elongated magnetic nanoparticle into conventional ferrofluid (consisting of magnetic nanospheres). Polarised SANS of such hybrid ferrofluids will provide the necessary information to reveal the reorientation and ordering of field-induced structures. The inter-particle correlations will be studied on a series of multi-component, hybrid ferrofluids with different concentration under the influence of an external magnetic field. The proposed experiment will give the opportunity to understand the connection between the microstructure mechanisms and magnetoviscous behavior of hybrid ferrofluidic dispersions.
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HONECKER Dirk; DISCH Sabrina; HOFFELNER Daniel and ZAKUTNA Dominika. (2015). Polarised SANS measurements on hybrid ferrofluidic dispersions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-261
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