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Journal Articles Procedia IUTAM Year : 2015

Ionic control of crack propagation in biopolymer hydrogels

Abstract

Alginate hydrogels stabilized by ionic interactions, fracture via crosslink unzipping and chain pull-out. It is found that, allowing non-binding ions to diffuse from a drop of brine into the crack tip region, leads to a strong acceleration of the crack. This is ascribed to the exchange between binding (Ca 2+) cations and non-binding ones, which facilitates the opening of unit chelating cages. The resulting lowering of the effective energy barrier is found merely entropic. The ion-exchange can be modelled as a rate-limited kinetic process, the order of which is fixed by the electroneutrality requirement, as checked by comparing the effect of monovalent and divalent cations. Although the embrittlement induced by a ionic shock could hinder the use of alginate gels in physiological environments where structural integrity and load-bearing capacity are required, it however can be thought as a powerful analytic tool for studying the nature and spatial extent of the dissipative mechanism at work when fracturing ultra-tough double network (including a ionic one) gels .
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Dates and versions

hal-01143863 , version 1 (20-04-2015)

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Tristan Baumberger, Olivier Ronsin. Ionic control of crack propagation in biopolymer hydrogels. Procedia IUTAM, 2015, 12 (2015), pp.3-9. ⟨10.1016/j.piutam.2014.12.002⟩. ⟨hal-01143863⟩
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