Exploiting particle shape in solid stabilized emulsions

Madivala, Basavaraj; Vandebril, Steven; Fransaer, Jan; Vermant, Jan

doi:10.1039/b816680c

Cited by 397 publications

(406 citation statements)

References 46 publications

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“…This has a pronounced influence on the interaction (of a longrange nature) between adhered particles on the surface. An in-depth discussion lies outside the scope of this review, but the interested reader is referred to (as a starting point) work by Vermant and coworkers [79,80].…”

Section: Interaction Of a Single Spherical Particle With A "Soft" Intmentioning

confidence: 99%

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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In this chapter, we will highlight conceptual physical approaches towards the fabrication of nanocomposite polymer latexes in which each individual latex particle contains one or more "hard" nanoparticles, such as clays, silicates, titanates, or other metal(oxides). By "physical approaches" we mean that the "hard" nanoparticles are added as pre-existing entities, and are not synthesized in situ as part of the nanocomposite polymer latex fabrication process. We will narrow our discussion to focus on physical methods that rely on the assembly of nanoparticles onto the latex particles after the latex particles have been formed, or its reciprocal analogue, the adhesion of polymer onto an inorganic nanoparticle. First, will discuss the phenomenon of heterocoagulation and its various driving forces, such as electrostatic interactions, the hydrophobic effect, and secondary molecular interactions. We will then address methods that involve assembly of nanoparticles onto or around the more liquid precursors (i.e., swollen/growing latex particles or monomer droplets). We will focus on the phenomenon of Pickering stabilization. We will then discuss features of particle interaction with soft interfaces, and see how the adhesion of particles onto emulsion droplets can be applied in suspension, miniemulsion, and emulsion polymerization. Finally, we will very briefly mention some interesting methods that make use of interface-driven templating for making well-defined assembled clusters and supracolloidal structures.

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Section: Interaction Of a Single Spherical Particle With A "Soft" Intmentioning

confidence: 99%

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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“…The situation envisaged is somewhat analogous to that for the compaction of three dimensional networks as for example can occur during the sedimentation process [52] . The exact nature of the variation of the interfacial yield stress with and the exact value of  , are sensitive functions of the shape of the nanoparticles, their polydispersity and more crucially, the type of colloidal interactions that may exist between them [53][54][55]. To our knowledge no generally accepted expressions for the dependence of the interfacial yield stress for such a particle network, adsorbed on a surface has been proposed so far [56].…”

Section: Theory and Methodsmentioning

confidence: 99%

Evolution of bubble size distribution in particle stabilised bubble dispersions: Competition between particle adsorption and dissolution kinetics

Ettelaie

Murray

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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It is shown that in systems containing bubbles stabilised by nanoparticles, the time scales for the dissolution of small microbubbles can be comparable with those involving the transport and adsorption of the stabilising nanoparticles onto the surface of the bubbles. We have studied the evolution of model bubble size distribution functions in the light of this effect and also the competition between different sized bubbles for the finite number of available particles. It is found that for dispersions moderately rich in nanoparticles, the width of the final distribution function can become broader than the initial one, whereas for cases deficient in particles the reverse is observed. For each given bubble size, there exists a particle to bubble concentration ratio above which the final size of a bubble of this radius is no longer affected by the presence of other bubbles. In a system deficient in particles, this can still hold true for bubbles in the lower end of the size distribution range, but not the ones at the upper end. By considering simple cases consisting of just two bubbles sizes, we show that the degree of shrinkage of the bigger bubbles is significantly increased in the presence of a small amount of gas in the form of smaller bubbles. In contrast, the final bubble size of the smaller bubbles is found to be largely insensitive to the amount of gas included within larger bubbles.The implications of these results for the final fraction of retained gas, in these types of particle stabilised bubble systems, is also discussed.3

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“…These individual images were extracted based on the droplet's center of mass, 2 , where a is the droplet radius and h is the microchannel height.…”

Section: Internal Circulation Measurementsmentioning

confidence: 99%

“…[1,2] Improved measurement techniques for interfacial rheology should advance understanding of its effect on emulsion performance. Here we suggest a new interfacial rheology method that tests small droplets directly, those of size comparable to real emulsion applications.…”

Section: Introductionmentioning

confidence: 99%

Shear and dilational interfacial rheology of surfactant-stabilized droplets

Erk

Martin

Schwalbe

et al. 2012

Journal of Colloid and Interface Science

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A new measurement method is suggested that is capable of probing the shear and dilational interfacial rheological responses of small droplets, those of size comparable to real emulsion applications. Freely suspended aqueous droplets containing surfactant and non-surface-active tracer particles are transported through a rectangular microchannel by the plane Poiseuille flow of the continuous oil phase. Optical microscopy and high-speed imaging record the shape and internal circulation dynamics of the droplets. Measured circulation velocities are coupled with theoretical descriptions of the droplet dynamics in order to determine the viscous (Boussinesq) and elastic (Marangoni) interfacial effects. A new Marangoni-induced stagnation point is identified theoretically and observed experimentally. Particle velocimetry at only two points (including gradients) in the droplet is sufficient to determine the amplitudes of the dilational and shear responses. We investigate the sensitivity for measuring interfacial properties and compare results from droplets stabilized by a small-molecule surfactant (butanol) and those stabilized by relatively large block copolymer molecules. Future increased availability of shear and dilational interfacial rheological properties is anticipated to lead to improved rules of thumb for emulsion preparation, stabilization, and general practice.

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Exploiting particle shape in solid stabilized emulsions

Cited by 397 publications

References 46 publications

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Evolution of bubble size distribution in particle stabilised bubble dispersions: Competition between particle adsorption and dissolution kinetics

Shear and dilational interfacial rheology of surfactant-stabilized droplets

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