2011 **Abstract:** Capillarity can be used to direct anisotropic colloidal particles to precise locations and to orient them by using interface curvature as an applied field. We show this in experiments in which the shape of the interface is molded by pinning to vertical pillars of different cross-sections. These interfaces present well-defined curvature fields that orient and steer particles along complex trajectories. Trajectories and orientations are predicted by a theoretical model in which capillary forces and torques are r…

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(246 citation statements)

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“…In experiment, microparticles migrate along curvature gradients to sites of high curvature, as has now been observed for microcylinders [2], microspheres [11], and microdisks [12]. Theoretically, the curvature capillary energy driving this migration is simply the sum of the surface energies and pressure work for particles at the interface.…”

confidence: 88%

“…In experiment, microparticles migrate along curvature gradients to sites of high curvature, as has now been observed for microcylinders [2], microspheres [11], and microdisks [12]. Theoretically, the curvature capillary energy driving this migration is simply the sum of the surface energies and pressure work for particles at the interface.…”

confidence: 88%

“…5.(c)). We impose a curvature field to the host interface using a technique reported previously [2] which we recapitulate briefly. A curved oil-water interface is formed around a micropost which is either circular or square in cross section (see the schematic in Fig.…”

confidence: 99%

“…In future work it will be interesting to change the shape of the object that pierces the interface [21,22], and to characterize the interaction between several objects [20], again varying systematically both the contact angle and the angle of inclination. In principle, the method could be applied to a wide range of systems in which gravity does not play a role.…”

confidence: 99%

“…These include mesh-free finite difference methods [20]; boundary-element simulations [21]; Surface Evolver simulations coupled to finitedifference simulations [22]; and an ordinary differential equation solver (MATLAB) [3].…”

confidence: 99%