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American Physical Society, Physical review E: Statistical, nonlinear, and soft matter physics, 6(90), 2014

DOI: 10.1103/physreve.90.060301

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Accounting for inertia effects to access the high-frequency microrheology of viscoelastic fluids

Journal article published in 2014 by P. Dom'inguez Garc'ia, P. Domínguez-García ORCID, Frédéric Cardinaux, Elena Bertseva, László Forró, Frank Scheffold, Sylvia Jeney
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Abstract

We study the Brownian motion of microbeads immersed in water and in a viscoelastic wormlike micelles solution by optical trapping interferometry and diffusing wave spectroscopy. Through the mean-square displacement obtained from both techniques, we deduce the mechanical properties of the fluids at high frequencies by explicitly accounting for inertia effects of the particle and the surrounding fluid at short time scales. For wormlike micelle solutions, we recover the 3/4 scaling exponent for the loss modulus over two decades in frequency as predicted by the theory for semiflexible polymers.