MHz Ultrasound Induced Roughness of Fluid Interfaces

Boubekri, Rym; Gross, Michel; Martin, Ivar; Diat, Olivier; Nobili, Maurizio; Möhwald, Helmuth; Stocco, Antonio

doi:10.1021/acs.langmuir.6b02167

Cited by 4 publications

(3 citation statements)

References 24 publications

(61 reference statements)

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“…UA is one of the considered options. As mentioned in [16], [17] and [18], ultrasonic acoustic emissions may generate short waves at the free-surface. To study this alternative, three underwater ultrasonic transducers have been tested (the characteristics of each transducers are described in Tab.2).…”

Section: Generation Of Texture Using Underwater Acoustics (Ua)mentioning

confidence: 95%

Towards accurate stereo-video based free-surface reconstruction for wave tank experiments

Page

Tassin

Caverne

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Measuring accurately the shape of the free surface in medium-scale hydrodynamic testing facilities is challenging with conventional wave gauges. To overcome this problem, it is necessary to go towards higher resolution measurement systems. For this purpose, we investigate the ability of stereo-video acquisition systems to reconstruct free surface waves in laboratory conditions. This technique has been proven to give satisfactory results in open sea conditions, although it is dependent on the environmental conditions (weather, solar incidence angle). At sea, the stereo-video reconstruction algorithm makes profit of the short waves generated by the wind in order to correlate the points from the left and right images. The main challenge of adapting this technique to laboratory conditions, i.e. in absence of sun and wind, is to overcome the absence of texture on the free surface. This paper presents recent work aiming at developing a stereo-vision measurement system for laboratory conditions. Our efforts have been devoted to finding an adapted lighting system and generating a texture suitable for the reconstruction algorithm. Different lighting configurations have been tested in order to understand its impact on the reconstructions. For the texture generation, we have investigated different means of generating short surface waves (water droplets, air blowing, circulation current, underwater acoustic emissions) in different experimental facilities. Our conclusions show that it is possible to reconstruct the shape of surface gravity waves in the presence of short surface waves and that the effects of lighting and texture on the quality of the reconstruction are strongly coupled.

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Section: Generation Of Texture Using Underwater Acoustics (Ua)mentioning

confidence: 95%

Towards accurate stereo-video based free-surface reconstruction for wave tank experiments

Page

Tassin

Caverne

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…The generation of the wavy patterns on the liquid film can be calculated by the force balance between the gravity, capillary pressures, and acoustic radiation pressure. Several research studies have shown the force balance after the deformation of the fluid interface, − although the fluid deformation is not induced by the SSAW. According to our previous study, the height of the 1D and 2D capillary wave motion on the PEGDA surface can be predicted by the acoustic pressure at the fluid film under the excitation of the SSAWs in the x - and y -axes ( p x and p y ) in a simple form …”

Section: Methodsmentioning

confidence: 99%

Standing Surface Acoustic Wave-Assisted Fabrication of Region-Selective Microstructures via User-Defined Waveguides

2019

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Polymer-based substrate with region-selective microstructures are crucial for many biomedical applications. Here, we explored a novel method based on standing surface acoustic waves (SSAWs) for the fabrication of localized polymer-based microstructures via a predefined waveguide. When the SSAWs are excited, the generated acoustic pressure field can be controlled in a predetermined region of the fluid surface through controlling the size and shape of the waveguide geometry. On the basis of the capillary wave motion, the generated acoustic pressure field can excite microwavy patterned structures on the surface. Then with use of ultraviolet (UV) solidification, the polymer-based substrates with region-selective patterned microstructures can be successfully fabricated. Both finite element modeling and experimental studies demonstrated that the polymer substrate with different region-selective microstructures can be achieved by selecting the pairs of interdigital transducers (IDTs) and shapes of the predefined waveguides. The results showed that the proposed method is effective for fabricating polymer-based substrate with region-selective microstructures and may have potential in cell-laden chips for tissue engineering, cell−cell interactions, and other biomedical applications.

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“…8 Furthermore, acoustic fluidic devices may contribute to environmental sustainability by collecting microplastics. 9 Acoustic waves are also useful for manipulating liquid boundaries 10 and particles 11 in dynamic conditions. For example, this approach has been applied to manipulate latex particles and yeast cells.…”

Section: Introductionmentioning

confidence: 99%

Visualization of a Standing Lattice of Scattered Light on Spherical Water Droplets under an Acoustic Field Using Biogenic Microparticles

Iwasaka

2021

Preprint

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Micromanipulation using acoustic sound is a promising technique for drug delivery, cell manipulation, biosensors, and microfluidic devices. Additionally, the visualization of acoustic fields by advanced optical measurement techniques can be combined with this micromanipulation technique. The present study reveals that a lattice pattern of reflected light appears on the surface of water droplets containing microparticles when the droplets are exposed to audible sound in the range of 1900–10000 Hz. A piezoelectric membrane providing an audible acoustic field induced a stream of microparticles on which the lattice pattern overlapped, with the appearance of a standing wave. The effects of microparticles, including BaSO4, TiO2, and guanine platelets derived from fish scales, on the formation of the lattice pattern were investigated. These three types of microparticles in water enabled a visualization of the vortex streams and generated a lattice pattern of reflected light. The guanine platelets exhibited the most precise lattice pattern over the droplet surface, with a lattice width of 100–200 μm. This phenomenon may provide a new tool for detecting and manipulating micro vortex flows in the aqueous chamber of a microfluidic device combined with an acoustic transducer.

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MHz Ultrasound Induced Roughness of Fluid Interfaces

Cited by 4 publications

References 24 publications

Towards accurate stereo-video based free-surface reconstruction for wave tank experiments

Towards accurate stereo-video based free-surface reconstruction for wave tank experiments

Standing Surface Acoustic Wave-Assisted Fabrication of Region-Selective Microstructures via User-Defined Waveguides

Visualization of a Standing Lattice of Scattered Light on Spherical Water Droplets under an Acoustic Field Using Biogenic Microparticles

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