Acoustic levitation of a large solid sphere

Andrade, Marco A. B.; Bernassau, A.L.; Adamowski, Júlio C.

doi:10.1063/1.4959862

Cited by 81 publications

(30 citation statements)

References 26 publications

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“…In practice, this principle does not work in air, as even low-density materials (i.e., EPS) have significantly higher acoustic impedances than the PHYSICAL REVIEW LETTERS 120, 044301 (2018) 044301-3 surrounding air. Alternatively, we note that large objects have been levitated using near field acoustic effects [54][55][56]; i.e., the sources must be placed around the object and in close proximity (on the order of a wavelength) to the surface of the object. However, despite the above progress, three-dimensional stable acoustic trapping of particles inside a standing wave or single beam has been fundamentally limited to particles smaller than half wavelength [57].…”

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confidence: 99%

Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

2018

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Acoustic vortices can transfer angular momentum and trap particles. Here, we show that particles trapped in airborne acoustic vortices orbit at high speeds, leading to dynamic instability and ejection. We demonstrate stable trapping inside acoustic vortices by generating sequences of short-pulsed vortices of equal helicity but opposite chirality. This produces a "virtual vortex" with an orbital angular momentum that can be tuned independently of the trapping force. We use this method to adjust the rotational speed of particles inside a vortex beam and, for the first time, create three-dimensional acoustics traps for particles of wavelength order (i.e., Mie particles).

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confidence: 99%

Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

2018

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“…In this regard, ultrasound offers a safer alternative to optical trapping with an applicability to a wider range of materials including larger particles and optically opaque substances. 9 In addition, for a given power input, the acoustic radiation force can be up to five orders of magnitude greater than that that can be achieved with light for macroscopic objects. 10,11 Ultrasonic manipulation started with quasi one-dimensional (1D) 12 and two-dimensional (2D) 13 standing wave devices which trap Rayleigh particles (i.e., a ( k, where a is the particle radius and k is the wavelength) in regular patterns.…”

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confidence: 99%

Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer

Franklin

Marzo

Malkin

et al. 2017

Applied Physics Letters

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We report a simple and compact piezoelectric transducer capable of stably trapping single and multiple micro-particles in water. A 3D-printed Fresnel lens is bonded to a two-element kerfless piezoceramic disk and actuated in a split-piston mode to produce an acoustic radiation force trap that is stable in three-dimensions. Polystyrene micro-particles in the Rayleigh regime (radius λ/14 to λ/7) are trapped at the focus of the lens (F# = 0.4) and manipulated in two-dimensions on an acoustically transparent membrane with a peak trap stiffness of 0.43 mN/m. Clusters of Rayleigh particles are also trapped and manipulated in three-dimensions, suspended in water against gravity. This transducer represents a significant simplification over previous acoustic devices used for micro-particle manipulation in liquids as it operates at relatively low frequency (688 kHz) and only requires a single electrical drive signal. This simplified device has potential for widespread use in applications such as micro-scale manufacturing and handling of cells or drug capsules in biomedical assays.

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“…These experimental results demonstrate the applicability of the potential technology for the further development of contactless manipulation techniques for liquid samples. Additionally, in the reduced gravity environment, the droplets with diameters exceeding the half wavelength of sound can be acoustically manipulated, which was previously considered impossible [35][36][37] . This enables sample manipulation over a wider range of droplet sizes.…”

Section: Discussionmentioning

confidence: 99%

Acoustic Manipulation of Droplets under Reduced Gravity

Hasegawa

Watanabe

Abe

2019

Sci Rep

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contactless manipulation of matter is essential for studying physical phenomena. Acoustic manipulation of liquid samples using ultrasonic phased arrays provides a novel and attractive solution for mid-air manipulation, such as levitation, transportation, coalescence, mixing, separation, evaporation, and extraction, with a simple and single sequence. Despite the importance of gravity in droplet dynamics, its effect on a levitated droplet with an ultrasonic phased array remains unclear. to disseminate acoustic manipulation, better understanding of the fundamental physics of a droplet manipulated by ultrasonic phased arrays is required. Here, we show contactless levitation, transportation, and coalescence of multiple droplets under both ground and reduced gravity. Under ground gravity, the possible levitation size of the sample is limited to below the half wavelength of sound. Under reduced gravity, however, droplets that are larger than the limit can be successfully levitated, transported, and coalesced. furthermore, the threshold of sound pressure for droplet levitation and manipulation could be minimised with the suppression of nonlinear acoustic phenomena under reduced gravity. these insights promote the development of contactless manipulation techniques of droplets for future space experiment and inhabitancy.

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Acoustic levitation of a large solid sphere

Cited by 81 publications

References 26 publications

Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

Acoustic Virtual Vortices with Tunable Orbital Angular Momentum for Trapping of Mie Particles

Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer

Acoustic Manipulation of Droplets under Reduced Gravity

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