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Elasticity of an interfacial particle raft

Research paper by Dominic Vella, Pascale Aussillous, L. Mahadevan

Indexed on: 11 Oct '04Published on: 11 Oct '04Published in: Physics - Soft Condensed Matter



Abstract

We study the collective behaviour of a close packed monolayer of non-Brownian particles at a fluid-liquid interface. Such a particle raft forms a two-dimensional elastic solid and can support anisotropic stresses and strains, e.g. it buckles in uniaxial compression and cracks in tension. We characterise this solid in terms of a Young's modulus and Poisson ratio derived from simple theoretical considerations and show the validity of these estimates by using an experimental buckling assay to deduce the Young's modulus.