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We study an elasticity model for compressed protein monolayers or particlerafts at a liquid interface. Based on the microscopic view of hard-coreparticles with soft shells, a bead-spring model is formulated and analyzed interms of continuum elasticity theory. The theory can be applied, for example,to hydrophobin-coated air-water interfaces or, more generally, to liquidinterfaces coated with an adsorbed monolayer of interacting hard-coreparticles. We derive constitutive relations for such particle rafts anddescribe the buckling of compressed planar liquid interfaces as well as theirapparent Poisson ratio. We also use the constitutive relations to obtain shapeequations for pendant or buoyant capsules attached to a capillary, and tocompute deflated shapes of such capsules. A comparison with capsules obeyingthe usual Hookean elasticity (without hard cores) reveals that the hard corestrigger capsule wrinkling. Furthermore, it is shown that a shape analysis ofdeflated capsules with hard-core/soft-shell elasticity gives apparent elasticmoduli which can be much higher than the original values if Hookean elasticityis assumed.

Elasticity of Interfacial Rafts of Hard Particles with Soft Shells