2015/04/22 by Sebastian Knoche, Jan Kierfeld · 8 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · Materials Science · Medicine · Physics and Astronomy · #Blood properties and coagulation #Composite material #Elastic modulus #Elasticity (physics) #Finite element method #Linear elasticity #Materials science #Mechanics #Monolayer #Nanotechnology #Physics #Pickering emulsions and particle stabilization #Proteins in Food Systems #Rheology #Thermodynamics #cond-mat.mtrl-sci #cond-mat.soft #q-bio.BM
paper · pdf · doi:10.1021/acs.langmuir.5b00083
published in Langmuir 31(19), 5364-5376 (American Chemical Society)
openalex publication_date 2015/04/22 · arxiv created 2015/05/10 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study an elasticity model for compressed protein monolayers or particle rafts at a liquid interface. Based on the microscopic view of hard-core particles with soft shells, a bead-spring model is formulated and analyzed in terms of continuum elasticity theory. The theory can be applied, for example, to hydrophobin-coated air-water interfaces or, more generally, to liquid interfaces coated with an adsorbed monolayer of interacting hard-core particles. We derive constitutive relations for such particle rafts and describe the buckling of compressed planar liquid interfaces as well as their apparent Poisson ratio. We also use the constitutive relations to obtain shape equations for pendant or buoyant capsules attached to a capillary, and to compute deflated shapes of such capsules. A comparison with capsules obeying the usual Hookean elasticity (without hard cores) reveals that the hard cores trigger capsule wrinkling. Furthermore, it is shown that a shape analysis of deflated capsules with hard-core/soft-shell elasticity gives apparent elastic moduli which can be much higher than the original values if Hookean elasticity is assumed.