Dynamics of magnetic nanoparticles in viscoelastic media

Remmer, Hilke; Roeben, Eric; Schmidt, Annette; Schilling, Meinhard; Ludwig, Frank

doi:10.1016/j.jmmm.2016.10.075

Cited by 25 publications

(17 citation statements)

References 8 publications

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“…(30) we find that the imaginary part χ is no longer given by a single Lorentzian as in the Debye model. In qualitative agreement with experimental observations [17,19], the location of the loss peak moves towards lower frequencies as the influence of viscoelasticity increases. At the same time, the height of the peak decreases and the width increases.…”

Section: Magnetic Susceptibilitysupporting

confidence: 90%

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Magnetic susceptibility, nanorheology, and magnetoviscosity of magnetic nanoparticles in viscoelastic environments

Ilg

Evangelopoulos

2018

Phys. Rev. E

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While magnetic nanoparticles suspended in Newtonian solvents (ferrofluids) have been intensively studied in recent years, the effects of viscoelasticity of the surrounding medium on the nanoparticle dynamics are much less understood. Here we investigate a mesoscopic model for the orientational dynamics of isolated magnetic nanoparticles subject to external fields, viscous and viscoelastic friction, as well as the corresponding random torques. We solve the model analytically in the overdamped limit for weak viscoelasticity. By comparison to Brownian dynamics simulations we establish the limits of validity of the analytical solution. We find that viscoelasticity not only slows down the magnetization relaxation, shifts the peak of the imaginary magnetic susceptibility χ^{″} to lower frequencies, and increases the magnetoviscosity but also leads to nonexponential relaxation and a broadening of χ^{″}. The model we study also allows us to test a recent proposal for using magnetic susceptibility measurements as a nanorheological tool using a variant of the Germant-DiMarzio-Bishop relation. We find for the present model and certain parameter ranges that the relation of the magnetic susceptibility to the shear modulus is satisfied to a good approximation.

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Section: Magnetic Susceptibilitysupporting

confidence: 90%

“…For comparison, we also performed Brownian dynamics simulations of Eqs. (17), (18) with τ Dγ = 0.1. We verified that identical results are obtained for lower values of τ Dγ .…”

Section: E Magnetoviscositymentioning

confidence: 99%

Magnetic susceptibility, nanorheology, and magnetoviscosity of magnetic nanoparticles in viscoelastic environments

Ilg

Evangelopoulos

2018

Phys. Rev. E

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“…by grinding) or synthesized using chemical processes, allowing for particles of well-defined shape, size, and material properties. [1][2][3][4][5][6][7][8][9] As the human body mass is transparent to static magnetic fields, MNPs that are injected into a body can be moved by application of inhomogeneous external fields. This allows an externally controlled accumulation of MNPs in specific places, e.g.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study

2021

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“…Binding assays based on fluxgate magnetorelaxometry have been used to study biotinylated agarose beads and bovine serum protein with streptavidin-functionalized MPs [ 202 ]. The complex susceptibility of CoFe 2 O 4 MPs in gelatin solution has also been explored [ 235 ]. A micro-fluxgate-based biosensor was reported to detect carcinoembryonic antigen and α-fetoprotein in a double-antibody sandwich assay at a detection limit of 0.1 μg/mL of Dynabeads MPs and detectable antigen at 1 pg/mL [ 200 ].…”

Section: Detection Techniques and Their Applicationsmentioning

confidence: 99%

Biosensing Using Magnetic Particle Detection Techniques

Chen

Kolhatkar

Zenasni

et al. 2017

Sensors

144

100

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Magnetic particles are widely used as signal labels in a variety of biological sensing applications, such as molecular detection and related strategies that rely on ligand-receptor binding. In this review, we explore the fundamental concepts involved in designing magnetic particles for biosensing applications and the techniques used to detect them. First, we briefly describe the magnetic properties that are important for bio-sensing applications and highlight the associated key parameters (such as the starting materials, size, functionalization methods, and bio-conjugation strategies). Subsequently, we focus on magnetic sensing applications that utilize several types of magnetic detection techniques: spintronic sensors, nuclear magnetic resonance (NMR) sensors, superconducting quantum interference devices (SQUIDs), sensors based on the atomic magnetometer (AM), and others. From the studies reported, we note that the size of the MPs is one of the most important factors in choosing a sensing technique.

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Dynamics of magnetic nanoparticles in viscoelastic media

Cited by 25 publications

References 8 publications

Magnetic susceptibility, nanorheology, and magnetoviscosity of magnetic nanoparticles in viscoelastic environments

Magnetic susceptibility, nanorheology, and magnetoviscosity of magnetic nanoparticles in viscoelastic environments

Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study

Biosensing Using Magnetic Particle Detection Techniques

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