Environmental Nanoparticle-Induced Toughening and Pinning of a Growing Crack in a Biopolymer Hydrogel - Sorbonne Université Access content directly
Journal Articles Physical Review Letters Year : 2019

Environmental Nanoparticle-Induced Toughening and Pinning of a Growing Crack in a Biopolymer Hydrogel

Abstract

We study the interplay between a crack tip slowly propagating through a hydrogel and nanoparticles suspended in its liquid environment. Using a proteinic gel enables us to tune the electrostatic interaction between the network and silica colloids. Thereby, we unveil two distinct, local toughening mechanisms. The primary one is charge independent and involves the convective building of a thin particulate clog, hindering polymer hydration in the crack process zone. When particles and network bear opposite charges, transient adhesive bonding superimposes, permitting the remarkable pinning of a crack by a liquid drop.
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Dates and versions

hal-02498100 , version 1 (04-03-2020)

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O. Ronsin, I. Naassaoui, A. Marcellan, T. Baumberger. Environmental Nanoparticle-Induced Toughening and Pinning of a Growing Crack in a Biopolymer Hydrogel. Physical Review Letters, 2019, 123 (15), pp.158002. ⟨10.1103/PhysRevLett.123.158002⟩. ⟨hal-02498100⟩
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