Abstract
We study the response of a film of colloidal spherocylinders to compression by combining pressure-area isotherm measurements, microscopy, and computer simulations. We find that the behavior of the film depends strongly on the geometry of the particles. For a small aspect ratio, a uniform monolayer forms and then buckles. For a higher aspect ratio, particles flip to orient perpendicular to the interface; we show that flipping occurs in locations where the nematic ordering is low. Our experiments and simulations further demonstrate that the longest particles rearrange to self-assemble a colloidal bilayer, which is stable due to the unique geometry of spherocylinders at an interface.
Highlights
We study the response of a film of colloidal spherocylinders to compression by combining pressurearea isotherm measurements, microscopy and computer simulations
We find that the behavior of the film depends strongly on the geometry of the particles
Particles flip to orient perpendicular to the interface; we show that flipping occurs in locations where the nematic ordering is low
Summary
We study the response of a film of colloidal spherocylinders to compression by combining pressurearea isotherm measurements, microscopy and computer simulations. Our experiments and simulations further demonstrate that the longest particles rearrange to self assemble a colloidal bilayer, which is stable due to the unique geometry of spherocylinders at an interface. We analyse the self-assembly and compression dynamics of a suspension of colloidal spherocylinders (cylinders capped by hemispherical ends) at a fluid-air interface by combining experiments and simulations.
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