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Particles trapped at a fluid-fluid interface by capillary forces can form amonolayer that jams and buckles when subject to uni-axial compression. Here weinvestigate experimentally the buckling mechanics of monolayers ofmillimeter-sized rigid plates trapped at a planar fluid-fluid interface subjectto uni-axial compression in a Langmuir trough. We quantified the bucklingwavelength and the associated force on the trough barriers as a function of thedegree of compression. To explain the observed buckling wavelength and forcesin the two-dimensional monolayer, we consider a simplified system composed of alinear chain of plate-like particles. The chain system enables us to build atheoretical model which is then compared to the two-dimensional monolayer data.Both the experiments and analytical model show that the wavelength of bucklingof a monolayer of plate-like particles is of the order of the particle size, adifferent scaling from the one reported for monolayers of spheres. A simplemodel of buckling surface pressure is also proposed, and an analysis of theeffect of the bending rigidity resulting from a small overlap between nanosheetparticles is presented. These results can be applied to the modeling of theinterfacial rheology and buckling dynamics of interfacial layers of 2Dnanomaterials.

Buckling of a monolayer of plate-like particles trapped at a fluid-fluid interface