Wetting and Contact Lines of Micrometer-Sized Ellipsoids

Loudet, Jean-Christophe; Yodh, Arjun G.; Pouligny, B.

doi:10.1103/physrevlett.97.018304

Phys. Rev. Lett.

2006

DOI: 10.1103/physrevlett.97.018304

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Wetting and Contact Lines of Micrometer-Sized Ellipsoids

Jean-Christophe Loudet

Arjun G. Yodh

B. Pouligny

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Cited by 154 publications

(211 citation statements)

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“…When distortions induced by neighboring particles overlap, the interfacial area decreases, resulting in capillary interactions that cause particles to attract and assemble. This effect, responsible for clustering of cereal in a bowl of milk (7), is now an important means for microparticle assembly at otherwise planar fluid interfaces, in particular for anisotropically shaped objects, which assemble with preferred orientations (4,6,(8)(9)(10)(11)(12)(13). At planar interfaces, the magnitude of the interaction is determined by the particle geometry, size, and surface energies.…”

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confidence: 99%

“…Microparticles of negligible weight distort the interface if the contact line (where fluid subphase, superphase, and particle meet) is undulated. Such contact lines can be generated by surface roughness, chemical heterogeneities (3,17,18), or by shape anisotropy (4,6,(8)(9)(10)(11)(12)(13). The resulting particle-induced deformation of the interface is a quadrupolar mode (3).…”

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confidence: 99%

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Curvature-driven capillary migration and assembly of rod-like particles

Cavallaro

Botto

Lewandowski

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

254

277

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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 related to Gaussian curvature gradients and angular deviations from principal directions of curvature. Interface curvature diverges near sharp boundaries, similar to an electric field near a pointed conductor. We exploit this feature to induce migration and assembly at preferred locations, and to create complex structures. We also report a repulsive interaction, in which microparticles move away from planar bounding walls along curvature gradient contours. These phenomena should be widely useful in the directed assembly of micro-and nanoparticles with potential application in the fabrication of materials with tunable mechanical or electronic properties, in emulsion production, and in encapsulation.anisotropic particles | colloidal interactions | colloidosome | Pickering | interfacial assemblies F luid interfaces are remarkable sites for directed migration and assembly of particles (1-6). When particles distort an interface, spontaneous, long-range interactions occur owing to capillary energy, given by the product of the surface tension and the area of the distortion. When distortions induced by neighboring particles overlap, the interfacial area decreases, resulting in capillary interactions that cause particles to attract and assemble. This effect, responsible for clustering of cereal in a bowl of milk (7), is now an important means for microparticle assembly at otherwise planar fluid interfaces, in particular for anisotropically shaped objects, which assemble with preferred orientations (4, 6, 8-13). At planar interfaces, the magnitude of the interaction is determined by the particle geometry, size, and surface energies. Hence, once the particles are placed at the interface, the strength of resulting capillary interactions is fixed. Assembly occurs at random locations on the interface determined by sites of initial encounter between the particles. In this work, we show that interface curvature can be employed as an external field to direct the location at which particles assemble. The phenomenon is entirely controlled by the coupling between geometry and capillarity. Therefore, it can be applied to colloids made of any material.When an anisotropic particle is placed on a curved fluid interface, capillary interactions arise, as the area of the interface then depends on the particle's orientation with respect to the principal axes and its location in a curvature gradient, resulting in torques (5, 14) and forces (5) on the particle. Because fluid interfaces can be molded and reconfigured using pinning sites, ...

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mentioning

confidence: 99%

mentioning

confidence: 99%

Curvature-driven capillary migration and assembly of rod-like particles

Cavallaro

Botto

Lewandowski

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

254

277

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“…Note, particles with anisotropy " ¼ 1:2 adsorb on the air-water interface and slightly deform the air-water interface [26]. These deformations induce a relatively weak capillary interparticle attraction.…”

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confidence: 99%

“…The experiments are reproducible across many droplets (4-10 for each aspect ratio), enabling accumulation of sufficient statistics to test continuum equation predictions of surface roughness scaling, and more. Strong shape-based capillary attractions between particles on the air-water interface [26][27][28][29][30][31][32] permit us to establish relationships between particle interaction and interfacial growth processes.…”

mentioning

confidence: 99%

“…Superficially, our experiments appear to have different conditions than those needed for KPZQ. However, the highly anisotropic ellipsoids induce strong capillary attraction on the air-water interface [26][27][28][29][30][31][32], which causes regions with many particles to strongly attract additional particles. Even particles that adsorb on the air-water interface in regions nearly void of particles are strongly attracted to particle-rich regions, and eventually are deposited in particle-rich regions.…”

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confidence: 99%

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Effects of Particle Shape on Growth Dynamics at Edges of Evaporating Drops of Colloidal Suspensions

et al. 2013

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We study the influence of particle shape on growth processes at the edges of evaporating drops. Aqueous suspensions of colloidal particles evaporate on glass slides, and convective flows during evaporation carry particles from drop center to drop edge, where they accumulate. The resulting particle deposits grow inhomogeneously from the edge in two-dimensions, and the deposition front, or growth line, varies spatio-temporally. Measurements of the fluctuations of the deposition front during evaporation enable us to identify distinct growth processes that depend strongly on particle shape. Sphere deposition exhibits a classic Poisson like growth process; deposition of slightly anisotropic particles, however, belongs to the Kardar-Parisi-Zhang (KPZ) universality class, and deposition of highly anisotropic ellipsoids appears to belong to a third universality class, characterized by KPZ fluctuations in the presence of quenched disorder.

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Synthesis of Multifunctional Micrometer‐Sized Particles with Magnetic, Amphiphilic, and Anisotropic Properties

et al. 2011

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Wetting and Contact Lines of Micrometer-Sized Ellipsoids

Cited by 154 publications

References 21 publications

Curvature-driven capillary migration and assembly of rod-like particles

Curvature-driven capillary migration and assembly of rod-like particles

Effects of Particle Shape on Growth Dynamics at Edges of Evaporating Drops of Colloidal Suspensions

Synthesis of Multifunctional Micrometer‐Sized Particles with Magnetic, Amphiphilic, and Anisotropic Properties

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