Microrheology of viscoelastic solutions studied by magnetic rotational spectroscopy

TL;DR

This paper introduces magnetic rotational spectroscopy using magnetic micron-size wires to measure viscoelastic properties of solutions, providing a novel method that aligns with traditional rheometry results.

Contribution

It demonstrates the use of magnetic rotational spectroscopy for viscoelastic measurements, offering an alternative to conventional rheometry with comparable accuracy.

Findings

Static shear viscosity measured accurately

Elastic modulus determined reliably

Method agrees with cone-and-plate rheometry

Abstract

Magnetic rotational spectroscopy is based on the use of magnetic micron-size wires for viscosity measurements. Submitted to a rotational magnetic field with increasing frequency, the wires undergo a hydrodynamic instability between a synchronous and an asynchronous regime. From a comparison between predictions and experiments, the static shear viscosity and elastic modulus of wormlike micellar solutions are here determined. The values agree with the determination by cone-and-plate rheometry.