Size effects on rotational particle diffusion in complex fluids as probed by Magnetic Particle Nanorheology

Abstract

Magnetic Particle Nanorheology is a versatile tool to investigate the size-dependent rheological properties of complex fluids using magnetic tracer particles.

Supramolecular Superparamagnetic Nanocomposites Based on a Magnetite-Filled Unentangled Terpyridine-Functionalized Polymer

“…32 Note that the viscosity is expected to match the zero shear viscosity η 0 * for polymer melts and solutions. 33 The effective relaxation time τ, associated with the macrospin reversal of SPION, can then be simply expressed as 30…”

“…It also supports the fact that in spite of a 552 lower aggregation, SPION embedded in the PnBA-TPy generate 553 less heat because of the higher viscosity of their local 554 environment, demonstrating that Brown relaxation cannot be 555 neglected.556 Interestingly, although it is limited to a qualitative analysis in 557 the present study, one could imagine measuring the heat 558 generated by a given fraction of SPION to access the local 559 rheological properties of their surroundings. While this 560 approach reminds the magnetic particle nanorheology,33,55 561 based on the Brownian rotation too, it enables, in principle, 562 measuring samples of higher viscosities, i.e., polymer melts, 563 under the restriction of a preidentification of the sole Neél 564 mechanism (achievable in the glassy state). Note that the 565 utilization of magnetically blocked particles32,33 is excluded in 566 our case since we need the Neél relaxation to generate heat from 567 the beginning of the experiment for applicative reasons.5.…”

“…While this 560 approach reminds the magnetic particle nanorheology,33,55 561 based on the Brownian rotation too, it enables, in principle, 562 measuring samples of higher viscosities, i.e., polymer melts, 563 under the restriction of a preidentification of the sole Neél 564 mechanism (achievable in the glassy state). Note that the 565 utilization of magnetically blocked particles32,33 is excluded in 566 our case since we need the Neél relaxation to generate heat from 567 the beginning of the experiment for applicative reasons.5. CONCLUSIONS568 Beyond their frequent utilization in metal−ligand supra-569 molecular networks, we have demonstrated that TPy-function-570 alized polymers are capable of forming attractive bonds with the 571 magnetic filler polar surface, similarly as what is observed in 572 P2VP/silica nanocomposites.…”

Dynamic magnetic birefringence in a viscoelastic ferrocolloid

“…Fine magnetic particles set to motion by an AC magnetic field make a highly sensitive tool for micro-and nanorheological analysis [1][2][3][4] and remote monitoring of (re)distribution of the particle-aided medical diagnostics and therapy [5][6][7][8].…”

“…This article is part of the theme issue 'Transport phenomena in complex systems (part 2)'. nanorheological analysis [1][2][3][4] and remote monitoring of (re)distribution of the particle-aided medical diagnostics and therapy [5][6][7][8].…”