Acoustic levitation of liquid drops: Dynamics, manipulation and phase transitions

Zang, Duyang; Yu, Yinkai; Chen, Zhen; Li, Xiaoguang; Wu, Hongjing; Geng, Xin

doi:10.1016/j.cis.2017.03.003

Cited by 98 publications

(47 citation statements)

References 82 publications

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“…4,5 Acoustic levitation employs acoustic radiation forces 6 to suspend objects in mid-air. Unlike other levitation techniques, such as optical tweezers 7 or electrostatic manipulation, 8 acoustic levitation supports a wide range of materials, including solids, [9][10][11] liquids, [12][13][14] bubbles, 15,16 and small living animals. 17,18 This feature makes acoustic levitation a desirable tool for analytical chemistry, 19,20 biology 21 or pharmacy.…”

Section: Introductionmentioning

confidence: 99%

Automatic contactless injection, transportation, merging, and ejection of droplets with a multifocal point acoustic levitator

Andrade

Camargo

Marzo

2018

Review of Scientific Instruments

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We present an acoustic levitation system that automatically injects, transports, merges and ejects liquid droplets in mid-air. The system consists of a phased array operating at 40 kHz on top of a plane reflector. The phase array generates multiple focal points at independent positions that form standing waves between the array and the reflector. In the reflector there is an inlet for a piezoelectric droplet injector which automatically inserts liquid droplets at the lower pressure nodes of the standing waves, and a hole that serves as an outlet for ejecting the processed droplets out of the system. Simulations of the acoustic radiation potential acting on the levitating droplets are in good agreement with the experiments. High-speed footage captured the functioning of the system in four fluidic operations: injection, transport, merging and ejection of liquid droplets. Having these operations integrated reliably into a single automatic system paves the way for the adoption of mid-air acoustophoretic processing in biological, chemical and pharmaceutical applications.

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Section: Introductionmentioning

confidence: 99%

Automatic contactless injection, transportation, merging, and ejection of droplets with a multifocal point acoustic levitator

Andrade

Camargo

Marzo

2018

Review of Scientific Instruments

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“…Through acoustic levitation, a sample can be suspended using the acoustic radiation force acting on the object [9]. This method enables contact-free treatment such as contamination, absorption, and heterogeneous nucleation through the wall effect [2]. In a study on single-acoustic levitation, Foresti et al [10] examined the coalescence of droplets using multiple Langevin type transducers and reflectors.…”

Section: Introductionmentioning

confidence: 99%

Coalescence Dynamics of Acoustically Levitated Droplets

Hasegawa

Watanabe

Kaneko

et al. 2020

Preprint

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The contactless coalescence of a droplet is of paramount importance for physical and industrial applications. This paper describes a coalescence method in mid-air via acoustic levitation using an ultrasonic phased array system. Acoustic levitation using ultrasonic phased arrays provides promising lab-on-a-drop applications, such as transportation, coalescence, mixing, separation, evaporation, and extraction in a continuous operation. The mechanism of droplet coalescence in mid-air may be better understood by experimentally and numerically exploring the droplet dynamics immediately before the coalescence. In this study, water droplets were experimentally levitated, transported, and coalesced by controlling acoustic fields. We observed that the edge of droplets deformed and attracted each other immediately before the coalescence. Through image processing, the radii of curvature of the droplets were quantified and the pressure difference between the inside and outside the droplet was simulated to obtain the pressure and velocity information on the droplet surface. The results revealed that the sound pressure acting on the droplet clearly decreased before the impact of the droplets. This pressure on the droplets was quantitatively analyzed from the experimental data. Our experimental and numerical results provide deeper physical insights into contactless droplet manipulation for futuristic lab-on-a-drop applications.

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“…Nanoparticles can be adsorbed at the fluid-fluid interfaces and significantly change the properties of these interfaces [21][22][23]. Introducing nanoparticles into the polymer matrix leads to the preparation of new honeycomb patterned composite and excellent property.…”

Section: Introductionmentioning

confidence: 99%

Formation of Hierarchical Porous Structure via Breath Figure Method

Zhang

2018

Advances in Condensed Matter Physics

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The porous structure films of PS containing silica nanoparticles of different hydrophobicity were obtained from breath figure method. For the porous films, the pores at the peripheral region and the center region were compared. It was found that the pores at the peripheral region appeared more uniform in size and showed higher degree of ordering. In addition, the patterns of the porous film became more disordered with the enhancing concentration of nanoparticles, and the pore size of the pore was increased. With the increase of the content of SiOH, that is, decrease in particle hydrophobicity, the Si elements were aggregated at the surface of the film and the interior of the pores. A hierarchical porous structure had been obtained at appropriate humidity and particle concentration. Finally, a possible mechanism of the hierarchical structure was proposed.

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Acoustic levitation of liquid drops: Dynamics, manipulation and phase transitions

Cited by 98 publications

References 82 publications

Automatic contactless injection, transportation, merging, and ejection of droplets with a multifocal point acoustic levitator

Automatic contactless injection, transportation, merging, and ejection of droplets with a multifocal point acoustic levitator

Coalescence Dynamics of Acoustically Levitated Droplets

Formation of Hierarchical Porous Structure via Breath Figure Method

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