Shape and Buckling Transitions in Solid-Stabilized Drops

Xu, Hui; Melle, Sonia; Golemanov, Konstantin; Fuller, Gerald G.

doi:10.1021/la0507378

Cited by 117 publications

(136 citation statements)

References 16 publications

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“…In contrast to the dispersion polymerization in which the polystyrene monomers are dissolved in alcohols, the emulsion polymerization here contains distinguished liquid-liquid interfaces due to the immiscibility between the monomers and the aqueous continuous phase. Thus the nanoparticles, even in the absence of electrostatic interactions, are thermodynamically favorable to self-assemble and remain at the liquid-liquid interfaces, following the same argument in sold-stabilized emulsions [37][38][39][40][41][42]. At the initial stage of polymerization, the nanoparticles provide stability to the monomer droplets.…”

Section: Resultsmentioning

confidence: 81%

Synthesis of polystyrene–silica composite particles via one-step nanoparticle-stabilized emulsion polymerization

Dai

2009

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 81%

Synthesis of polystyrene–silica composite particles via one-step nanoparticle-stabilized emulsion polymerization

Dai

2009

Journal of Colloid and Interface Science

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“…The final surface coverage after 1.4 ms, with the bubble at rest, has decreased to ϕ 0 ≈ 0.38. Interestingly, monolayer buckling is typically not accompanied by expulsion of particles (18)(19)(20), for instance if the desorption energy of the particles is too large, or if attractive interparticle interactions prevent the particles from detaching from a cohesive monolayer (21). As the interparticle interactions in our system are attractive (SI Text), the observation of buckling accompanied by particle expulsion suggests that the dynamic deformation of the monolayer alters its microstructure.…”

Section: Resultsmentioning

confidence: 87%

Ultrafast desorption of colloidal particles from fluid interfaces

Poulichet

Garbin

2015

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

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The self-assembly of solid particles at fluid-fluid interfaces is widely exploited to stabilize emulsions and foams, and in materials synthesis. The self-assembly mechanism is very robust owing to the large capillary energy associated with particle adsorption, of the order of millions of times the thermal energy for micrometer-sized colloids. The microstructure of the interfacial colloid monolayer can also favor stability, for instance in the case of particle-stabilized bubbles, which can be indefinitely stable against dissolution due to jamming of the colloid monolayer. As a result, significant challenges arise when destabilization and particle removal are a requirement. Here we demonstrate ultrafast desorption of colloid monolayers from the interface of particle-stabilized bubbles. We drive the bubbles into periodic compression-expansion using ultrasound waves, causing significant deformation and microstructural changes in the particle monolayer. Using high-speed microscopy we uncover different particle expulsion scenarios depending on the mode of bubble deformation, including highly directional patterns of particle release during shape oscillations. Complete removal of colloid monolayers from bubbles is achieved in under a millisecond. Our method should find a broad range of applications, from nanoparticle recycling in sustainable processes to programmable particle delivery in lab-on-achip applications.self-assembly | colloidal interactions | Pickering | interfacial assemblies C olloidal particles can adsorb to fluid-fluid interfaces and confer outstanding stability to emulsions and foams (1, 2). The interfacial self-assembly of colloids has been used to create novel materials, for instance colloidosomes (3) and bijels (4). These applications rely on the large decrease in free energy accompanying particle adsorption, ΔE = −γ 0 πa 2 ð1 − cos θÞ 2 , which depends on the surface tension γ 0 , the particle size a, and the three-phase contact angle θ (5), and ranges from hundreds to millions of times the thermal energy for nanometer-to micrometer-sized particles. The microstructure that the colloidal particles form at the interface has also been shown to enhance stability. For instance, jamming of an interfacial colloid monolayer prevents coarsening in bicontinuous emulsions (4) and can arrest the dissolution of particle-stabilized bubbles (6). Particle removal from fluid-fluid interfaces is a significant challenge in emerging applications of functional nanoparticles in interfacial biocatalysis (7), gas storage (8), and biomass conversion (9), where the ability to recover and regenerate the nanoparticles at the end of the process is a key requirement. The most common approaches to particle removal from fluid interfaces are based on the physicochemical modification of the fluid phases or the interface. Desorption has been obtained for instance by the addition of a surface-active agent (10, 11). In addition, by tuning the strength of electrostatic repulsion between charged particles at an interface through pH and el...

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“…The compression of particle-laden droplets, whose radii are in the vicinity of 10 µm, using Scanning Force Microscopy [10] or Atomic Force Microscopy [11] revealed substantial deviations from the elastic shell models, with apparent contributions from surface tension. The aspiration of sessile particle-laden millimetric droplets observed buckling as the tension of the interface approaches zero [15,16].…”

Section: Pacs Numbers: I Introductionmentioning

confidence: 99%

Mechanical stability of particle-stabilized droplets under micropipette aspiration

et al. 2017

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We investigate the mechanical behavior of particle-stabilized droplets using micropipette aspiration. We observe that droplets stabilized with amphiphilic dumbbell-shaped particles exhibit a two-stage response to increasing suction pressure. Droplets first drip, then wrinkle and buckle like an elastic shell. While particles have a dramatic impact on the mechanism of failure, the mechanical strength of the droplets is only modestly increased. On the other hand, droplets coated with the molecular surfactant Sodium Dodecyl Sulfate are even weaker than bare droplets. In all cases, the magnitude of the critical pressure for the onset of instabilities is set by the fluid surface tension.

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Shape and Buckling Transitions in Solid-Stabilized Drops

Cited by 117 publications

References 16 publications

Synthesis of polystyrene–silica composite particles via one-step nanoparticle-stabilized emulsion polymerization

Synthesis of polystyrene–silica composite particles via one-step nanoparticle-stabilized emulsion polymerization

Ultrafast desorption of colloidal particles from fluid interfaces

Mechanical stability of particle-stabilized droplets under micropipette aspiration

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