Scale-dependent particle diffusivity and apparent viscosity in polymer solutions as probed by dynamic magnetic nanorheology

Hess, Melissa; Gratz, Micha; Remmer, Hilke; Webers, Samira; Landers, Joachim; Borin, Dmitry; Ludwig, Frank; Wende, Heiko; Odenbach, Stefan; Tschöpe, Andreas; Schmidt, Annette

doi:10.1039/c9sm00747d

Cited by 22 publications

(36 citation statements)

References 57 publications

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“…To realize such settings magnetic systems represent natural candidates. Similar situations have been addressed in several experimental, theoretical, and simulation studies in the field of magnetic microrheology [14][15][16]28]. There, information on the dynamics of the viscoelastic medium is extracted from the configurational response of embedded magnetic particles to timedependent external magnetic fields.…”

Section: Magnetically Induced Particle Reorientationsmentioning

confidence: 83%

“…From the magnitude and time sequence of the response, the rheological properties of the surroundings of the probe particles are extracted. * E-mail: a.menzel@ovgu.de A convenient approach of imposing in a noninvasive way the external stimulus to which the probe particles respond is provided by magnetic microrheology [3,7,[12][13][14][15][16]. There, the probe particles react to magnetic fields applied from outside.…”

Section: Introductionmentioning

confidence: 99%

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Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

Richter,

Deters,

Menzel

2021

Preprint

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Using analytical calculations, we characterize the rotational behavior of a rigid spherical particle when subject to a net external torque in a continuous viscoelastic environment. On long time scales, the embedding medium can either feature a net terminal flow, like a fluid, or damped reversible dynamics, like an elastic solid. The coupling of the sphere to its environment together with the therein induced deformations and flows are taken into account explicitly. In reality, using magnetically anisotropic particles, the torque can, for instance, be applied via magnetic fields. We calculate corresponding response functions. This connects our study to evaluations of microrheological investigations.

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Section: Magnetically Induced Particle Reorientationsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

Richter,

Deters,

Menzel

2021

Preprint

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“…40 Elongated ferromagnetic nanoparticles can be applied as nanoprobes for nanorheological approaches when their magnetic moment is preferentially aligned along the long rotation axis due to shape anisotropy. 41 More exotic magnetization states can be found, e.g. in hollow particles, 42 nanorings, 43 nanotubes, 44 and other shape-anisotropic hollow particles, 45 or nanodots 46 and nano-octopods.…”

Section: Introductionmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

et al. 2022

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“…40 Elongated ferromagnetic nanoparticles can be applied as nanoprobes for nanorheological approaches when their magnetic moment is preferentially aligned along the long rotation axis due to shape anisotropy. 41 More exotic magnetization states can be found, e.g. in hollow particles 42 including nanorings, 43 nanotubes, 44 and other shape-anisotropic hollow particles, 45 or nanodots 46 and nano-octopods 47 .…”

Section: Introductionmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

Honecker,

Bersweiler,

Erokhin

et al. 2022

Preprint

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Magnetic nanoparticles offer unique potential for various technological, biomedical, or environmental applications thanks to the size-, shape-and material-dependent tunability of their magnetic properties. To optimize particles for a specific application, it is crucial to interrelate their performance with their structural and magnetic properties. This review presents the advantages of small-angle X-ray and neutron scattering techniques for achieving a detailed multiscale characterization of magnetic nanoparticles and their ensembles in a mesoscopic size range from 1 to a few hundred nanometers with nanometer resolution. Both X-rays and neutrons allow the ensemble-averaged determination of structural properties, such as particle morphology or particle arrangement in multilayers and 3D assemblies. Additionally, the magnetic scattering contributions enable retrieving the internal magnetization profile of the nanoparticles as well as the inter-particle moment correlations caused by interactions within dense assemblies. Most measurements are used to determine the time-averaged ensemble properties, in addition advanced small-angle scattering techniques exist that allow accessing particle and spin dynamics on various timescales. In this review, we focus on conventional small-angle X-ray and neutron scattering (SAXS and SANS), X-ray and neutron reflectometry, gracing-incidence SAXS and SANS, X-ray resonant magnetic scattering, and neutron spin-echo spectroscopy techniques. For each technique, we provide a general overview, present the latest scientific results, and discuss its strengths as well as sample requirements. Finally, we give our perspectives on how future small-angle scattering experiments, especially in combination with micromagnetic simulations, could help to optimize the performance of magnetic nanoparticles for specific applications.

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Scale-dependent particle diffusivity and apparent viscosity in polymer solutions as probed by dynamic magnetic nanorheology

Abstract: In several upcoming rheological approaches, including methods of micro- and nanorheology, the measurement geometry is of critical impact on the interpretation of the results. The relative size of the probe...

Cited by 22 publications

References 57 publications

Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation

Using small-angle scattering to guide functional magnetic nanoparticle design

Using small-angle scattering to guide functional magnetic nanoparticle design

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