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High bandwidth noninvasive measurements of the linear viscoelasticity of collagen gels

Abstract : We report measurements of the linear viscoelastic modulus of collagen gels. Collagen gels are cross-linked networks of bundles formed from the association of single filaments. Their structure is heterogeneous at microscopic length scales, and measurements of their viscoelasticity at a larger scale are required. We use a technique that we recently developed based on the measurement of surface thermal fluctuations and called surface fluctuation specular reflection [Pottier et al., Soft Matter 7, 7843–7850 (2011)] to characterize the linear viscoelastic properties of collagen gels for frequencies ranging from 1 Hz to 30 kHz. These properties are determined at a mesoscopic scale (∼100 μm) at which the gels are homogeneous. We further study the influence of both collagen origin and concentration in the light of previous findings on these systems.
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Submitted on : Monday, November 7, 2016 - 2:29:17 PM
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M. Verhulsel, S. Shivokhin, A. Simon, S. Descroix, Christian Frétigny, et al.. High bandwidth noninvasive measurements of the linear viscoelasticity of collagen gels. Journal of Rheology, American Institute of Physics, 2016, 60 (6), pp.1269 - 1278. ⟨10.1122/1.4965039⟩. ⟨hal-01393439⟩

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