Arresting dissolution by interfacial rheology design

Beltramo, Peter J.; Gupta, Manish; Alicke, Alexandra; Liaščukienė, Irma; Gunes, Deniz Z.; Baroud, Charles N.; Vermant, Jan

doi:10.1073/pnas.1705181114

Cited by 85 publications

(100 citation statements)

References 37 publications

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“…In general, β is in the range 2–8, and η is typically 0.2–0.4. Similar behavior was seen by Beltramo et al and Cicuta et al for micrometer‐sized particles, while Maestro et al observed similar values for

{G^{'}}_{normals}

for silica NPs. In all cases

{G^{'}}_{normals}

is between 0.1 and 1 N m −1 , even though the particle size ranged from 14 nm up to 3 µm.…”

Section: Quantitative Descriptions Of Complex Interfacessupporting

confidence: 85%

“…For the case of liquid–fluid interfaces and interfaces wetted by reversibly adsorbed components, Γ ij = 0 and the surface stress is exactly equal to the liquid–fluid surface tension as measured using pendant drop or Wilhelmy plate. In the presence of material that is quasi‐irreversibly bound to the liquid–liquid interface Γ ij becomes significant, and gives rise to the complex shapes observed in Pickering emulsions, liquid capsules, bijels, and, most recently, printed and molded liquids …”

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

“…The dilatational response, which is typically more important from an applications perspective, is rather more complex. Significant insight into these complexities has been given in recent years by Vermant and co‐workers . A number of commercially available methods exist for the study of the response of interfaces to dilatational and compressive stresses (i.e., their Gibbs elasticity, bending modulus, and elastic modulus) .…”

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}

for silica NPs. In all cases

{G^{'}}_{normals}

is between 0.1 and 1 N m −1 , even though the particle size ranged from 14 nm up to 3 µm.…”

Section: Quantitative Descriptions Of Complex Interfacessupporting

confidence: 85%

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

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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“…The stability of an oleofoam is influenced by several factors. Crystals can adsorb at the air-oil interfaces of the bubbles (Mishima et al 2016;Heymans et al 2017) and impart interfacial elasticity, similar to that observed for aqueous Pickering foams (Basheva et al 2011;Beltramo et al 2017;Binks 2002;Hunter et al 2008;Stocco et al 2011), therefore preventing bubble dissolution. Another contributing factor is the rheology of the bulk oleogel formed by the crystals remaining in the oil phase.…”

Section: Introductionmentioning

confidence: 67%

Stability of bubbles in wax-based oleofoams: decoupling the effects of bulk oleogel rheology and interfacial rheology

et al. 2020

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Oleofoams are dispersions of gas bubbles in a continuous oil phase and can be stabilized by crystals of fatty acids or waxes adsorbing at the oil-air interface. Because excess crystals in the continuous phase form an oleogel, an effect of the bulk rheology of the continuous phase is also expected. Here, we evaluate the contributions of bulk and interfacial rheology below and above the melting point of a wax forming an oleogel in sunflower oil. We study the dissolution behaviour of single bubbles using microscopy on a temperature-controlled stage. We compare the behaviour of a bubble embedded in an oleofoam, which owes its stability to both bulk and interfacial rheology, to that of a bubble extracted from the oleofoam and resuspended in oil, for which the interfacial dilatational rheology alone provides stability. We find that below the melting point of the wax, bubbles in the oleofoam are stable whereas bubbles that are only coated with wax crystals dissolve. Both systems dissolve when heated above the melting point of the wax. These findings are rationalized through independent bulk rheological measurements of the oleogel at different temperatures, as well as measurements of the dilatational rheological properties of a wax-coated oil-air interface.

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“…The particle-stabilising effect is generally attributed to a kinetic barrier (pictured as an 'armored' bubble or droplet) formed by the adsorbed particles, thereby preventing coalescence of droplets [6], although for very specific systems, a thermodynamically stable Pickering emulsion has been achieved [7]. 10 However, it now seems that a sufficient condition for droplet stabilisation is a yield stress interface, which can even be achieved with sub-monolayer coverage [8,9,10]. Here the surface structure must play an important role in determining the mechanical behaviour of the interface.…”

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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Arresting dissolution by interfacial rheology design

Cited by 85 publications

References 37 publications

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Stability of bubbles in wax-based oleofoams: decoupling the effects of bulk oleogel rheology and interfacial rheology

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

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