Capillary Assembly of Colloids: Interactions on Planar and Curved Interfaces

Liu, Iris B.; Sharifi-Mood, Nima; Stebe, Kathleen J.

doi:10.1146/annurev-conmatphys-031016-025514

Cited by 102 publications

(101 citation statements)

References 89 publications

(150 reference statements)

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“…Colloids bound to oil-water interfaces provide another example in which long-ranged attractive or repulsive interactions are caused by the interface deformations. These in turn are determined by how the interface wets the colloids (6,7). Lipid membranes provide a complex environment that combines both liquid crystalline-like anisotropy due to the alignment of the fatty chains and interface deformations due to effective twodimensional confinement (8).…”

mentioning

confidence: 99%

Conformational switching of chiral colloidal rafts regulates raft–raft attractions and repulsions

Miller

Joshi

Sharma

et al. 2019

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

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Membrane-mediated particle interactions depend both on the properties of the particles themselves and the membrane environment in which they are suspended.Experiments have shown that chiral rod-like inclusions dissolved in a colloidal membrane of opposite handedness assemble into colloidal rafts, which are finite-sized reconfigurable droplets consisting of a large but precisely defined number of rods. Here, we systematically tune the chirality of the background membrane, and find that in the achiral limit colloidal rafts acquire fundamentally new structural properties and interactions. In particular, rafts can switch between two chiral states of opposite handedness, which dramatically alters the nature of the membrane-mediated raft-raft interactions. Rafts with the same chirality have long-ranged repulsions, while those with opposite chirality acquire attractions with a welldefined minimum. Both attractive and repulsive interactions are explained by a continuum model that accounts for the coupling between the membrane thickness and the local tilt of the constituent rods. These switchable interactions enable assembly of colloidal rafts into intricate higher-order architectures with unusual symmetries, including stable tetrameric clusters and "ionic crystallites" of counter-twisting domains organized on a binary square lattice. Furthermore, the properties of individual rafts, such as their sizes, are controlled by their complexation with other rafts. The emergence of these complex behaviors can be rationalized purely in terms of generic couplings between compositional and orientational order of fluids of rod-like elements. Thus, the uncovered principles might have relevance for conventional lipid bilayers, in which the assembly of higher-order structures is also mediated by complex membrane-mediated interactions. Significance Statement:We describe hierarchical assemblages of colloidal rods that mimic some of the complexity and reconfigurability of biological structures. We show that chiral rod-like inclusions dissolved in an achiral colloidal membrane assemble into rafts,

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mentioning

confidence: 99%

Conformational switching of chiral colloidal rafts regulates raft–raft attractions and repulsions

Miller

Joshi

Sharma

et al. 2019

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

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“…The bubble raft is formed by the buoyancy of the bubbles and macroscopic deformation of the meniscus. The phenomenon of capillary curvature attraction is now well established, in prior work it was reported how interface curvature influence an attraction of microparticles . An assembly of unmodified SiO 2 and amphiphilic Janus microbubbles showed strikingly different behaviors at a convex air–water interface .…”

mentioning

confidence: 93%

Nanoparticle‐Shelled Catalytic Bubble Micromotor

Adams

Lee

Mei

et al. 2020

Adv Materials Inter

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Nanoparticle‐shelled bubbles, prepared with glass capillary microfluidics, are functionalized to produce catalytic micromotors that exhibit novel assembly and disassembly behaviors. Stable microbubble rafts are assembled at an air–solvent interface of nonaqueous propylene carbonate (PC) solvent by creating a meniscus using a glass capillary. Upon the addition of hydrogen peroxide fuel, catalytic microbubbles quickly break free from the bubble raft by repelling from each other and self‐propelling at the air–fuel interface (a mixture of PC and aqueous hydrogen peroxide). While most of micromotors generate oxygen bubbles on the outer catalytic shell, some micromotors contain cracks and eject bubbles from the hollow shells containing air. Nanoparticle‐shelled bubbles with a high buoyancy force are particularly attractive for studying novel propulsion modes and interactions between catalytic bubble micromotors at air–fuel interfaces.

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“…Capillary force therefore is inevitable when interfaces bridge the colloidal particles or particle-liquid boundary is exposed to the vapor phase. Taking advantage of topological tailor of the long-distance interaction in tiny particle system, the means of capillary assembly from the colloidal suspensions tuned by the solvent evaporation is economic thus widely used to access well-defined structures [9,10]. For colloidal suspensions, DLVO (Derjaguin-Landau-Verwey-Overbeek) theory is widely accepted to describe the multiple forces among particles within complex fluids [11].…”

Section: Introductionmentioning

confidence: 99%

Capillary assembly of colloidal particles on patterned surfaces

et al. 2020

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Capillary attraction at the meniscus between tiny objects plays a crucial role in self-assembly processes. The shape of the meniscus governed by the Laplace equation devotes to a long-range attraction distinct to the DLVO defined forces. Rather than considering trapped particles on ideal smooth surfaces, we use patterned substrates with ordered nano-arrays for theoretical modeling toward the capillary assembly. The vertical elevation of particles is found to change the shape of the meniscus between particles, therefore the interaction energy and capillary force. A minimal model is developed to determine the capillary force between particles and thus the motility of particles, therefore the criterion of the crystallization of colloidal particles. It turns out that the formation of a colloidal crystal or amorphous medium depends on the optimization between the scaled particle separation by its size and the geometrical design of the supporting nano-arrays. Finally, we experimentally confirmed the capillary assembly from colloidal suspensions, by playing the control parameters defined in our theoretical model, with a nice agreement. This model system can mimic the practical applications of nano-structure fabrication on versatile real surfaces for functionality purposes.

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Capillary Assembly of Colloids: Interactions on Planar and Curved Interfaces

Cited by 102 publications

References 89 publications

Conformational switching of chiral colloidal rafts regulates raft–raft attractions and repulsions

Conformational switching of chiral colloidal rafts regulates raft–raft attractions and repulsions

Nanoparticle‐Shelled Catalytic Bubble Micromotor

Capillary assembly of colloidal particles on patterned surfaces

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