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Recoil experiments determine the eigenmodes of viscoelastic fluids

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arxiv 2204.02369 v1 pith:GINLEE6K submitted 2022-04-05 cond-mat.soft

Recoil experiments determine the eigenmodes of viscoelastic fluids

F\'elix Ginot , Juliana Caspers , Luis Frieder Reinalter , Karthika Krishna Kumar , Matthias Kr\"uger , Clemens Bechinger This is my paper
classification cond-mat.soft
keywords modelparticlerecoileigenmodestimescalesviscoelasticadditionalagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We experimentally investigate the recoil dynamics of a colloidal probe particle after shearing it with constant velocity through a viscoelastic fluid. The recoil displays two distinct timescales which are in excellent agreement with a microscopic model built on a particle being linked to two bath particles by harmonic springs. This model yields analytical expressions which reproduce all experimental protocols, including additional waiting periods before particle release. Notably, two sets of timescales appear, corresponding to reciprocal and nonreciprocal eigenmodes of the model.

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