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Issue 43, 2016
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Divergence of the third harmonic stress response to oscillatory strain approaching the glass transition

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Abstract

The leading nonlinear stress response in a periodically strained concentrated colloidal dispersion is studied experimentally and by theory. A thermosensitive microgel dispersion serves as well-characterized glass-forming model, where the stress response at the first higher harmonic frequency (3ω for strain at frequency ω) is investigated in the limit of small amplitude. The intrinsic nonlinearity at the third harmonic exhibits a scaling behavior which has a maximum in an intermediate frequency window and diverges when approaching the glass transition. It captures the (in-) stability of the transient elastic structure. Elastic stresses in-phase with the third power of the strain dominate the scaling. Our results qualitatively differ from previously derived scaling behavior in dielectric spectroscopy of supercooled molecular liquids. This might indicate a dependence of the nonlinear response on the symmetry of the external driving under time reversal.

Graphical abstract: Divergence of the third harmonic stress response to oscillatory strain approaching the glass transition

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Publication details

The article was received on 15 Jul 2016, accepted on 05 Oct 2016 and first published on 07 Oct 2016


Article type: Paper
DOI: 10.1039/C6SM01616B
Citation: Soft Matter, 2016,12, 8825-8832
  • Open access: Creative Commons BY-NC license
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    Divergence of the third harmonic stress response to oscillatory strain approaching the glass transition

    R. Seyboldt, D. Merger, F. Coupette, M. Siebenbürger, M. Ballauff, M. Wilhelm and M. Fuchs, Soft Matter, 2016, 12, 8825
    DOI: 10.1039/C6SM01616B

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