Collapse mechanisms and extreme deformation of particle-laden interfaces

Garbin, Valeria

doi:10.1016/j.cocis.2019.02.007

Cited by 42 publications

(28 citation statements)

References 85 publications

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“…Structured interfaces can also absorb compressive stress by the expulsion of material into one of the liquid phases. 57 We did not observe this process in the system studied here. The microparticles used in our experiments were rather large and therefore strongly bound to the silicone oilÀcastor oil interface (with a binding energy E10 4 k B T), 55 thus preventing particle expulsion.…”

Section: Influence Of Particle Size On Deformation and Yieldingmentioning

confidence: 54%

Electric-field-induced deformation, yielding, and crumpling of jammed particle shells formed on non-spherical Pickering droplets

et al. 2021

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Section: Influence Of Particle Size On Deformation and Yieldingmentioning

confidence: 54%

Electric-field-induced deformation, yielding, and crumpling of jammed particle shells formed on non-spherical Pickering droplets

et al. 2021

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“…shear) forces are applied to the system. 15,27,30 Usage of periodic compression-expansion due to an ultrasound wave also causes detachment of solid particles from a bubble surface. 15 Gold nanoparticles detach from the wateroctafluoropentylacrylate interface upon compression of a pendant drop.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous particle desorption and “Gorgon” drop formation from particle-armored oil drops upon cooling

et al. 2020

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HypothesisDrop "self-shaping" is a phenomenon in which cooled oily emulsion drops undergo a spectacular series of shape transformations (Denkov et al., Nature 528, 2015, 392). Solid particles adsorbed on the oil-water interface could affect this drop self-shaping process in multiple ways which have not been studied. ExperimentsWe prepared Pickering emulsions stabilized by spherical latex particles and afterwards added surfactant of low concentration which enabled drop self-shaping. Next we observed by optical microscopy the processes which occur upon emulsion cooling. FindingsSeveral new processes were observed: (1) Adsorbed latex particles rearranged into regular hexagonal lattices upon freezing of the surfactant adsorption layer. (2) Spontaneous particle desorption from the drop surface was observed at a certain temperaturethis phenomenon is rather remarkable, as the solid particles are known to irreversibly adsorb on fluid interfaces. (3) Very strongly adhered particles to drop surfaces acted as a template to enable the formation of tens to hundreds of semi-liquid fibers, growing outwards from the drop surface, thus creating a shape resembling the Gorgon head from Greek mythology. We provide mechanistic explanations of all observed phenomena using our understanding of the rotator phase formation on the surface of cooled drops.

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“…The depletion interaction provided by dissolving a hydrophilic polymer (e.g., poly(ethylene glycol) (PEG)) in the sub-phase is also shown to improve the binding of hydrophilic colloidal silica particles to the air/water interface and yield a collapse mode in form of multilayer formation [ 219 ]. The interested reader can seek information on extreme deformation of particle-laden interfaces and the resulting collapse mechanisms in the review paper by V. Garbin [ 220 ].…”

Section: Interfacial Rheologymentioning

confidence: 99%

Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

2021

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The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.

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Collapse mechanisms and extreme deformation of particle-laden interfaces

Cited by 42 publications

References 85 publications

Electric-field-induced deformation, yielding, and crumpling of jammed particle shells formed on non-spherical Pickering droplets

Electric-field-induced deformation, yielding, and crumpling of jammed particle shells formed on non-spherical Pickering droplets

Spontaneous particle desorption and “Gorgon” drop formation from particle-armored oil drops upon cooling

Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

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