Oscillating Ferrofluid Droplet Microrheology of Liquid-Immersed Sessile Droplets

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Research units

  • Aalto University

Abstract

The damped oscillations of liquid-immersed ferrofluid sessile droplets were studied with high-speed imaging experiments and analytical modeling to develop a novel microrheology technique. Droplet oscillations were induced with an external magnetic field, thereby avoiding transients in the resulting vibrational response of the droplet. By following the droplet relaxation with a high-speed camera, the frequency and relaxation time of the damped harmonic oscillations were measured. We extend upon existing analytical theories to describe our liquid-immersed sessile droplet system, and directly quantify the droplet relaxation with the viscosity of the internal and external fluid as well as the interfacial tension between these. The easily controllable magnetic droplets make our oscillating ferrofluid droplet technique a potential candidate for high-throughput microrheology and tensiometry in the future.

Details

Original languageEnglish
Pages (from-to)6300-6306
Number of pages7
JournalLangmuir
Volume33
Issue number25
Publication statusPublished - 27 Jun 2017
MoE publication typeA1 Journal article-refereed

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