Micromechanics of liquid-phase exfoliation of a layered 2D material: A hydrodynamic peeling model

We present a micromechanical analysis of flow-induced peeling of a layered 2D material suspended in a liquid, for the first time accounting for realistic hydrodynamic loads. In our model, fluid forces trigger a fracture of the inter-layer interface by lifting a flexible “flap” of nanomaterial from t...

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Bibliographic Details
Published inJournal of the mechanics and physics of solids Vol. 134; p. 103764
Main Authors Salussolia, Giulia, Barbieri, Ettore, Pugno, Nicola Maria, Botto, Lorenzo
Format Journal Article
LanguageEnglish
Published London Elsevier Ltd 01.01.2020
Elsevier BV
Subjects
2D materials
Adhesion
Exfoliation
Fluid
Fracture
Fracture mechanics
Liquid phases
Micromechanics
Microparticles
Nanomaterials
Peeling
Shear rate
Two dimensional materials
Two dimensional models
Viscosity
Fracture
Peeling
Exfoliation
2D materials
Fluid
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Summary:We present a micromechanical analysis of flow-induced peeling of a layered 2D material suspended in a liquid, for the first time accounting for realistic hydrodynamic loads. In our model, fluid forces trigger a fracture of the inter-layer interface by lifting a flexible “flap” of nanomaterial from the surface of a suspended microparticle. We show that the so far ignored dependence of the hydrodynamic load on the wedge angle produces a transition in the curve relating the critical fluid shear rate for peeling to the non-dimensional adhesion energy. For intermediate values of the non-dimensional adhesion energy, the critical shear rate saturates, yielding critical shear rate values that are drastically smaller than those predicted by a constant load assumption. Our results highlight the importance of accounting for realistic hydrodynamic loads in fracture mechanics models of liquid-phase exfoliation.
ISSN:0022-5096
1873-4782
DOI:10.1016/j.jmps.2019.103764