Acoustic interaction between 3D-fabricated cubic bubbles

Combriat, Thomas; Rouby-Poizat, Philippine; Doinikov, Alexander A.; Stéphan, Olivier; Marmottant, Philippe

doi:10.1039/c9sm02423a

Cited by 15 publications

(11 citation statements)

References 14 publications

(20 reference statements)

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“…We tested di↵erent aperture diameters: 4, 5 and 6 µm (see Figure 2(a)). The flow velocity behind each AMB is measured using a combination of a PIV software, [8] and a homemade Python code. Figure 2(b) shows the flow velocity behind each AMB for di↵erent frequencies.…”

Section: Streaming Velocity From the Propelling Bubblementioning

confidence: 99%

Hovering Microswimmers Exhibit Ultrafast Motion to Navigate under Acoustic Forces

Louf

Bertin

Dollet

et al. 2018

Adv Materials Inter

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The goal of this study is to engineer 3D-microswimmers containing a bubble that can be stimulated and guided with acoustic waves emitted by transducers. By using 3D-microfabrication techniques, we designed 20⇥20⇥26 µm swimmers with a trapped air bubble pointing towards the substrate, thus mimicking an hovercraft. We then remotely applied acoustic vibrations to the bubble, which generates a strong steady flow (0.1-2 mm/s), an e↵ect referred as acoustic streaming, resulting in a jet below the hovercraft. We found that the motion of the swimmer relies on two parameters, namely the frequency and amplitude of the acoustic wave. We measured the swimmer velocities and observed a very wide distribution: from 0.05 to 350 mm/s or 17500 body lengths. Such a high velocity in terms of body length makes this swimmer one of the fastest among the di↵erent microswimmers reported in the literature.[25] The motion of the swimmer is found to be a combination of two forces orientated in di↵erent directions: the streaming force and the radiation force. While the first one is reducing adhesion, the second one is helping the motion. Using di↵erent transducers orientated towards di↵erent directions, we were able to navigate the swimmer into di↵erent directions as well.

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Section: Streaming Velocity From the Propelling Bubblementioning

confidence: 99%

Hovering Microswimmers Exhibit Ultrafast Motion to Navigate under Acoustic Forces

Louf

Bertin

Dollet

et al. 2018

Adv Materials Inter

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“…In a previous work we introduced cubic bubbles: air pockets trapped in 3D-fabricated cubic frames immersed under water. The frame stabilizes both the bubble position and volume for more than a day [10] and enables us to build an array of such bubbles [11] useful to create new acoustic metamaterials. Capillary forces prevent water from entering the frames if the openings are small enough (a maximum aperture of 2.1 mm was reported for a cube, a dimension comparable to the capillary length l c ¼ ffiffiffiffiffiffiffiffiffiffiffi σ=ρ l g p , with σ the surface tension, ρ l the liquid density, and g the gravitational constant).…”

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confidence: 99%

Polyhedral Bubble Vibrations

et al. 2021

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Underwater bubbles are extremely good acoustic resonators, but are freely evolving and dissolving. Recently it was found that bubbles can be stabilized in frames, but the influence of the frame shape is still undocumented. Here we first explore the vibration of polyhedral bubbles with a low number of faces, shaped as the five Platonic solids. Their resonance frequency is well approximated by the formula for spherical bubbles with the same volume. Then we extend these results to shapes with a larger number of faces using fullerenes, paving the way to obtain arbitrary large resonant bubbles.

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“…The close-distance regime has been addressed by several numerical and experimental studies (Bremond et al 2005(Bremond et al , 2006Deane & Stokes 2008;Manasseh, Riboux & Risso 2008;Fong et al 2009;Chew et al 2011;Wiedemair et al 2014), including the case of coalescence (Deane & Stokes 2008;Manasseh et al 2008) or the proximity of solid boundaries (Bremond et al 2005(Bremond et al , 2006Chew et al 2011). Experiments on larger (millimetric) bubbles have been performed as well (Hsiao, Devaud & Bacri 2001;Fong et al 2009;Chew et al 2011;Combriat et al 2020). However, well-controlled experiments are difficult to devise.…”

Section: Introductionmentioning

confidence: 99%

“…However, well-controlled experiments are difficult to devise. A major pitfall is the lack of control on bubble positions, and hence on inter-bubble distances, as well as geometry of larger ensembles; this issue is generally addressed by tethering the bubbles to solid supports (Hsiao et al 2001;Chew et al 2011;Combriat et al 2020;Boughzala et al 2021) or by optical trapping (Garbin et al 2007). In the case of micrometric bubbles, coalescence and/or dissolution are common phenomena, which can be limited, for instance, by stabilising adsorbed shells on the bubbles ( Van der Meer et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Interferometric detection of hydrodynamic bubble–bubble interactions

et al. 2022

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We report a new interferometric method to study the interactions between two gas bubbles undergoing small-amplitude oscillations in a liquid, based on the extension of a previously developed one-bubble set-up. Nanometric oscillations of millimetre-sized supported bubbles are excited acoustically; the response of each bubble is recorded interferometrically, as a function of the mutual distance (from quasi-contact to greater than the bubbles radii). The interferometric nature of the technique and the resonant nature of the vibration modes enable the accurate measurement of the amplitude (with sub-nanometric sensitivity), frequency and mutual phase of oscillation, whose variations over the bubble–bubble distance range allow the interactions to be probed. The bubbles oscillate at the same frequencies, exhibiting a low-frequency, in-phase and a high-frequency, out-of-phase resonance peak, whose separation is a function of distance, in good agreement with the theory for free interacting bubbles. The technique, here demonstrated for the volume modes of air bubbles in water, can be extended to other gas–liquid and liquid–liquid interfaces, bare or adsorbate-covered, as well as to shape oscillations.

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Acoustic interaction between 3D-fabricated cubic bubbles

Abstract: Spherical bubbles are difficult to hold in specific arrangements and tend to dissolve in water over time. Using 3D-fabricated cubic frames we trap and stabilize bubbles that still oscillate under acoustic excitation.

Cited by 15 publications

References 14 publications

Hovering Microswimmers Exhibit Ultrafast Motion to Navigate under Acoustic Forces

Hovering Microswimmers Exhibit Ultrafast Motion to Navigate under Acoustic Forces

Polyhedral Bubble Vibrations

Interferometric detection of hydrodynamic bubble–bubble interactions

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