Interfacial Rheology of Sterically Stabilized Colloids at Liquid Interfaces and Its Effect on the Stability of Pickering Emulsions

Hooghten, Rob Van; Blair, Victoria E.; Vananroye, Anja; Schofield, Andrew B.; Vermant, Jan; Thijssen, Job H. J.

doi:10.1021/acs.langmuir.6b04365

Cited by 68 publications

(60 citation statements)

References 58 publications

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“…Layer‐by‐layer assembly was used to produce a number of interfacial coacervates based on hydrogen‐bonding polymers, in which a H‐bond‐donating polymer, e.g., poly(methacrylic acid) (PMAA) or poly(acrylic acid) (PAA), binds to a H‐bond‐accepting polymer, e.g., poly(vinylpyrrolidone) (PVP) or poly(propylene oxide) (PPO). De Baubigny et al then studied the same system but, rather than using layer‐by‐layer assembly, the polymers were initially separated in immiscible phases (i.e., oil and water) and interacted with one another at the liquid–liquid interface, in a manner similar to that used by Kaufman et al Interfacial shear rheology showed that the mechanical moduli of the H‐bonded polymer coacervates could be tuned over four orders of magnitude by varying pH (

{G^{'}}_{normals} \approx 10^{- 3} - 10^{1}

N m −1 , note that the upper limit may underestimate film strength due to the compliance of the DWR geometry) . In combination with microscopy and profilometry to measure film thickness and capsule behavior, the rheological properties of the film could then be related to capsule and emulsion structure and stability as a function of pH (Figure c,d).…”

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

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Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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imparts novel mechanical and functional properties to the macroscopic interface itself. These properties include size-and charge-selective pathways for molecules and particulates, shear and compressive moduli, and selective binding and reaction sites. Complex interfaces can then be used to generate complex, macroscopic, all-liquid materials with very high surface areas that have unique properties, such as compartmentalization, communication between compartments, and the ability to move and reconfigure. With the rapid growth in the study of complex materials made from interfacially structured liquids, there is a need to review the field from the funda-Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications. Figure 2.Interactions between particles attached to liquid-fluid interfaces. a) Dipole-dipole interactions between adsorbed particles due to asymmetric charge distributions near the surface of particles at interfaces. Reproduced with permission. [34] Copyright 1980, American Physical Society. b) Dipole-dipole interactions give rise to 2D colloidal crystals with large lattice spacings. Scale bar, 50 µm. Reproduced with permission. [36]

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{G^{'}}_{normals} \approx 10^{- 3} - 10^{1}

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

“…a) The Double Wall Ring geometry, which can be mounted on a commercial rheometer and used to probe solely the material properties of the adsorbed species. Reproduced with permission . Copyright 2017, American Chemical Society.…”

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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“…This effect was used to help explain the shape of aggregates formed by mosquito eggs at the air-water interface [19] and more recently the self-assembly of cubes at an interface [20]. Surface roughness on a particle can 20 lead to an undulating contact line, which distorts the meniscus [21] and has been used as a simple and robust way to impart emulsion stability [22,23].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of ellipsoidal particles at fluid-fluid interfaces with an empirical pair potential

Luo

Vermant

Ilg

et al. 2019

Journal of Colloid and Interface Science

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Colloidal particles adsorbed at fluid-fluid interfaces interact via mechanisms that can be specific to the presence of interfaces, for instance, lateral capillary interactions induced by nonspherical particles. Capillary interactions are highly relevant for self-assembly and the formation of surface microstructures, however, these are very challenging to model due to the multibody nature of capillary interactions. This work pursues a direct comparison between our computational modelling approach and experimental results on surface microstructures formed by ellipsoidal particles. We begin by investigating the accuracy of using pairwise interactions to describe the multibody capillary interaction by contrasting exact two- and three-particle interaction energies and we find that the pairwise approximation appears reasonable for the experimentally relevant configurations studied. We then develop an empirical pair potential and use it in Monte-Carlo type simulations to efficiently model the structure formation process for relevant particle properties such as aspect ratio, contact angle and surface coverage, and succeed in reproducing our experimental observations where we spread sterically-stabilised ellipsoidal particles onto an oil-air interface at high surface coverage. At lower surface coverages, we find that the self-assembly process falls into the diffusion-limited colloid aggregation universality class.

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“…For weakly hydrophobic particles the surface shear elasticity (G') was unmeasurable and close to the sensitivity limit of the measurement technique. For weak particle networks Van Hooghten [30] emphasized that care should be taken when interpreting the viscoelastic properties of particle-laden films because the geometry inertia can lead to erroneous behaviour. As particles partition more strongly at the air-water interface the contribution from G' emerges and a strongly elastic interface eventually formed with long-range attraction attributed to hydrophobic and capillary forces.…”

Section: Introductionmentioning

confidence: 99%

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

Zhang

Biggs

et al. 2018

Journal of Colloid and Interface Science

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Particle-stabilized emulsions and foams are widely encountered, as such there remains a concerted effort to better understand the relationship between the particle network structure surrounding droplets and bubbles, and the rheology of the particle-stabilized interface. Poly(vinylpyrrolidone)-coated silica nanoparticles were used to stabilize foams. The shear rheology of planar particle-laden interfaces were measured using an interfacial shear rheometer and the rheological properties measured as a function of the sub-phase electrolyte concentration and surface pressure. All particle-laden interfaces exhibited a liquid-like to solid-like transition with increasing surface pressure. The surface pressure-dependent interfacial rheology was then correlated to the formed micron-scale structures of the particle-laden interfaces which were imaged using a Brewster angle microscope. With the baseline knowledge established, foams were prepared using the same composite particles and the particle network structure imaged using cryo-SEM. An attempt has been made to correlate the two structures observed at a planar interface and that surrounding a bubble to elucidate the likely rheology of the bubble stabilizing particle network. Independent of the sub-phase electrolyte concentration, the resulting rheology of the bubble stabilizing particle network was strongly elastic and appeared to be in a compression state at the region of the L-S phase transition.

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Interfacial Rheology of Sterically Stabilized Colloids at Liquid Interfaces and Its Effect on the Stability of Pickering Emulsions

Cited by 68 publications

References 58 publications

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Self-assembly of ellipsoidal particles at fluid-fluid interfaces with an empirical pair potential

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

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