A symmetrical method to obtain shear moduli from microrheology

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dc.citation.firstpage3716
dc.citation.journalTitleSoft Matter
dc.citation.lastpage3723
dc.citation.volumeNumber14
dc.contributor.authorNishi, Kengo
dc.contributor.authorKilfoil, Maria L.
dc.contributor.authorSchmidt, Christoph F.
dc.contributor.authorMacKintosh, F.C.
dc.date.accessioned2019-11-22T16:19:51Z
dc.date.available2019-11-22T16:19:51Z
dc.date.issued2018
dc.description.abstractPassive microrheology typically deduces shear elastic loss and storage moduli from displacement time series or mean-squared displacements (MSD) of thermally fluctuating probe particles in equilibrium materials. Common data analysis methods use either Kramers–Kronig (KK) transformation or functional fitting to calculate frequency-dependent loss and storage moduli. We propose a new analysis method for passive microrheology that avoids the limitations of both of these approaches. In this method, we determine both real and imaginary components of the complex, frequency-dependent response function χ(ω) = χ′(ω) + iχ′′(ω) as direct integral transforms of the MSD of thermal particle motion. This procedure significantly improves the high-frequency fidelity of χ(ω) relative to the use of KK transformation, which has been shown to lead to artifacts in χ′(ω). We test our method on both model and experimental data. Experiments were performed on solutions of worm-like micelles and dilute collagen solutions. While the present method agrees well with established KK-based methods at low frequencies, we demonstrate significant improvement at high frequencies using our symmetric analysis method, up to almost the fundamental Nyquist limit.
dc.identifier.citationNishi, Kengo, Kilfoil, Maria L., Schmidt, Christoph F., et al.. "A symmetrical method to obtain shear moduli from microrheology." <i>Soft Matter,</i> 14, (2018) Royal Society of Chemistry: 3716-3723. https://doi.org/10.1039/C7SM02499A.
dc.identifier.digitalc7sm02499a
dc.identifier.doihttps://doi.org/10.1039/C7SM02499A
dc.identifier.urihttps://hdl.handle.net/1911/107710
dc.language.isoeng
dc.publisherRoyal Society of Chemistry
dc.rightsThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.titleA symmetrical method to obtain shear moduli from microrheology
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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