Particle manipulation by a non-resonant acoustic levitator

Andrade, Marco A. B.; Pérez, Nicolás; Adamowski, Júlio C.

doi:10.1063/1.4905130

Cited by 55 publications

(23 citation statements)

References 22 publications

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“…This technique, which is illustrated in Fig. 1(a), can be divided in two configurations: resonant [8][9][10] and non-resonant 11,12 . In resonant levitation devices, the distance between the transducer and the reflector should be approximately equal to a multiple of a half wavelength.…”

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confidence: 99%

“…In a non-resonant configuration, the distance between the reflector and the transducer can be selected at will, without requiring the separation distance to be set to a multiple of a half wavelength. In this configuration, small light particles can be manipulated by maintaining the transducer at a fixed position and moving the reflector in relation to the transducer 11 . Another technique to acoustically levitate objects is the near-field acoustic levitation (also called squeeze-film levitation) 14 .…”

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confidence: 99%

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Acoustic levitation of a large solid sphere

Andrade

Bernassau

Adamowski

2016

Applied Physics Letters

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We demonstrate that acoustic levitation can levitate spherical objects much larger than the acoustic wavelength in air. The acoustic levitation of an expanded polystyrene sphere of 50 mm in diameter, corresponding to 3.6 times the wavelength, is achieved by using three 25 kHz ultrasonic transducers arranged in a tripod fashion. In this configuration, a standing wave is created between the transducers and the sphere. The axial acoustic radiation force generated by each transducer on the sphere was modeled numerically as a function of the distance between the sphere and the transducer. The theoretical acoustic radiation force was verified experimentally in a setup consisting of an electronic scale and an ultrasonic transducer mounted on a motorized linear stage. The comparison between the numerical and experimental acoustic radiation forces presents a good agreement.

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confidence: 99%

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confidence: 99%

Acoustic levitation of a large solid sphere

Andrade

Bernassau

Adamowski

2016

Applied Physics Letters

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“…The nonlinearity of acoustic wave propagation in liquid and gaseous media is known to generate acoustic radiation forces 1 which have been harnessed to create fluid flow 2 , microparticle manipulation in liquids 3 and to manipulate larger objects suspend in gases 4 – 6 . Using acoustic radiation forces to achieve levitation is of significant practical importance as it removes the need for the levitated object to be in contact with surfaces 7 and hence been used widely in containerless processing 8 – 10 , chemical analysis 11 , 12 , drop dynamics 13 , 14 and bioreactors 15 , 16 .…”

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confidence: 99%

Dynamics of levitated objects in acoustic vortex fields

Hong

Yin

Zhai

et al. 2017

Sci Rep

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Acoustic levitation in gaseous media provides a tool to process solid and liquid materials without the presence of surfaces such as container walls and hence has been used widely in chemical analysis, high-temperature processing, drop dynamics and bioreactors. To date high-density objects can only be acoustically levitated in simple standing-wave fields. Here we demonstrate the ability of a small number of peripherally placed sources to generate acoustic vortex fields and stably levitate a wide range of liquid and solid objects. The forces exerted by these acoustic vortex fields on a levitated water droplet are observed to cause a controllable deformation of the droplet and/or oscillation along the vortex axis. Orbital angular momentum transfer is also shown to rotate a levitated object rapidly and the rate of rotation can be controlled by the source amplitude. We expect this research can increase the diversity of acoustic levitation and expand the application of acoustic vortices.

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“…We assume mass and radius of the particle as m = 3 × 10 −21 kg and R = 100 nm, which resembles typical biological sample particles, such as virus particle. (1) corresponds to the force from the potential of an eigen mode that has a minimum at the center of the cavity r = 0 [15][16][17]. Assuming the particle has, at least, one symmetry axis and the longitudinal motion is parallel to that axis, there is no deflecting force in the transverse direction [18].…”

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confidence: 99%

Acoustic Funnel and Buncher for Nanoparticle Injection

Shi

Cao

et al. 2019

Phys. Rev. Applied

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Acoustics-based techniques are investigated to focus and bunch nanoparticle beams. This allows to overcome the prominent problem of the longitudinal and transverse mismatch of particle-stream and x-ray-beam size in single-particle/single-molecule imaging at x-ray free-electron lasers (XFEL). It will also enable synchronized injection of particle streams at kHz repetition rates. Transverse focusing concentrates the particle flux to the size of the (sub)micrometer x-ray focus. In the longitudinal direction, focused acoustic waves can be used to bunch the particle to the same repetition rate as the x-ray pulses. The acoustic manipulation is based on simple mechanical recoil effects and could be advantageous over light-pressure-based methods, which rely on absorption. The acoustic equipment is easy to implement and can be conveniently inserted into current XFEL endstations. With the proposed method, data collection times could be reduced by a factor of 10 4 . This work does not just provide an efficient method for acoustic manipulation of streams of arbitrary gas-phase particles, but also opens up wide avenues for acoustics-based particle optics.

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Particle manipulation by a non-resonant acoustic levitator

Cited by 55 publications

References 22 publications

Acoustic levitation of a large solid sphere

Acoustic levitation of a large solid sphere

Dynamics of levitated objects in acoustic vortex fields

Acoustic Funnel and Buncher for Nanoparticle Injection

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