Shape oscillations of particle-coated bubbles and directional particle expulsion

Poulichet, Vincent; Huerre, Axel; Garbin, Valeria

doi:10.1039/c6sm01603k

Cited by 34 publications

(33 citation statements)

References 44 publications

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“…It is also interesting to note that this simple criterion is in qualitative agreement with the data provided by Poulichet et al 18 . Indeed, in their experiments, the latex particle size and density are respectively R p = 250 nm and ρ p = 1040 kg m −3 , the air-liquidparticle contact angle is θ p ≈ 45 o 17 , the frequency of excitation is f e = 40 kHz, the surface tension is γ GL ≈ 70 mN m −1 and the amplitude of oscillation required for the particles dispersion is typically 50 µm.…”

Section: Particle Expulsion From Spherical Armoured Bubblessupporting

confidence: 90%

Nonspherical armoured bubble vibration

et al. 2017

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In this paper, we study the dynamics of cylindrical armoured bubbles excited by mechanical vibrations. A step by step transition from cylindrical to spherical shape is reported as the intensity of the vibration is increased, leading to a reduction of the bubble surface and a dissemination of the excess particles. We demonstrate through energy balance that nonspherical armoured bubbles constitute a metastable state. The vibration instills the activation energy necessary for the bubble to return to its least energetic stable state: a spherical armoured bubble. At this point, particle desorption can only be achieved through higher amplitude of excitation required to overcome capillary retention forces. Nonspherical armoured bubbles open perspectives for tailored localized particle dissemination with limited excitation power.

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Section: Particle Expulsion From Spherical Armoured Bubblessupporting

confidence: 90%

Nonspherical armoured bubble vibration

et al. 2017

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“…Sustained non-spherical oscillations due to shape instabilities of particle-coated bubbles were also reported [77,75]. In this case, particle expulsion is localized at the antinodes of the shape oscillations [ Figure 4…”

Section: Extreme Deformation: High-rate or Unsteadymentioning

confidence: 65%

Collapse mechanisms and extreme deformation of particle-laden interfaces

Garbin

2019

Current Opinion in Colloid & Interface Science

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“…Gas diffuses out of the bubbles leading to a decrease in volume. The layer of particles behaves as a solid-like film and crumples upon area compression, without any apparent shedding of particles, in contrast to latex-stabilized air bubbles dissolving in water upon cooling 14 or undergoing compression by other mechanisms 33,34 . We checked the effect of the rate of area compression on this mechanical instability of the particle layer by changing the heating rate.…”

Section: Resultsmentioning

confidence: 99%

Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

et al. 2017

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We investigated the dissolution and morphological dynamics of air bubbles in alkanes stabilized by fluorinated colloidal clay particles when subjected to temperature changes. A model for bubble dissolution with time-dependent temperature reveals that increasing the temperature enhances the bubble dissolution rate in alkanes, opposite to the behavior in water, due to the differing trends in gas solubility. Experimental results for uncoated air bubbles in decane and hexadecane confirm this prediction. Clay-coated bubbles in decane and hexadecane are shown to be stable in air-saturated oil at constant temperature, where dissolution is driven mainly by the Laplace pressure. When the temperature increases from ambient, the particle-coated bubbles are prone to dissolution as the oil phase becomes under-saturated. The interfacial layer of particles is observed to undergo buckling and crumpling, without shedding of clay particles. Increasing the concentration of particles is shown to enhance the bubble stability by providing a higher resistance to dissolution. When subjected to complex temperature cycles, for which the effect of the time-dependent temperature is dominant, the clay-coated bubbles can resist long-term dissolution in conditions for which uncoated bubbles dissolve completely. These results underpin the design of ultra-stable oil foams stabilized by solid particles with improved shelf life under changing environmental conditions. † These authors contributed equally 2/21

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Shape oscillations of particle-coated bubbles and directional particle expulsion

Abstract: Ultrasound waves drive shape oscillations of particle-coated microbubbles. During the ultrafast, non-uniform deformation of the interface, particles are expelled from the antinodes of the shape oscillations.

Cited by 34 publications

References 44 publications

Nonspherical armoured bubble vibration

Nonspherical armoured bubble vibration

Collapse mechanisms and extreme deformation of particle-laden interfaces

Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

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