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Yield stress aging in attractive colloidal suspensions

Abstract : We investigate the origin of yield stress aging in semidense, saline, and turbid suspensions in which structural evolution is rapidly arrested by the formation of thermally irreversible roll-resisting interparticle contacts. By performing optical tweezer three-point bending tests on particle rods, we show that these contacts yield by overcoming a rolling threshold, the critical bending moment of which grows logarithmically with time. We demonstrate that this time-dependent contact-scale rolling threshold controls the suspension yield stress and its aging kinetics. We identify a simple constitutive relation between the contact-scale flexural rigidity and rolling threshold, which transfers to macroscopic scales. This leads us to establishing a constitutive relation between macroscopic shear modulus and yield stress that is generic for an array of colloidal systems.
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https://hal.archives-ouvertes.fr/hal-03396746
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Submitted on : Thursday, January 20, 2022 - 4:50:27 PM
Last modification on : Friday, August 5, 2022 - 11:54:24 AM

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Francesco Bonacci, Xavier Chateau, Eric M Furst, Julie Goyon, Anaël Lemaître. Yield stress aging in attractive colloidal suspensions. Physical Review Letters, American Physical Society, 2022, 128, pp.018003. ⟨10.1103/PhysRevLett.128.018003⟩. ⟨hal-03396746v2⟩

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