Aligning high-aspect ratio particles in user-specified orientations with ultrasound directed self-assembly

Prisbrey, M.; Raeymaekers, Bart

doi:10.1121/1.5136536

Cited by 3 publications

(3 citation statements)

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“…Given that the demand for high transducer number PATs is increasing 18,[50][51][52][53] : Diff-PAT is already more suited to optimise large transducer number PATs than an Eigensolver type method, both in terms of accuracy and computational efficiency. Furthermore, there are abundant applications of PATs where the accurate reconstruction of the acoustic field is prioritised over computational speed 18,[25][26][27]54 .…”

Section: Application Of Diff-pat For Acoustic Metamaterialsmentioning

confidence: 99%

Acoustic hologram optimisation using automatic differentiation

Fushimi

Yamamoto

Ochiai

2021

Sci Rep

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Acoustic holograms are the keystone of modern acoustics. They encode three-dimensional acoustic fields in two dimensions, and their quality determines the performance of acoustic systems. Optimisation methods that control only the phase of an acoustic wave are considered inferior to methods that control both the amplitude and phase of the wave. In this paper, we present Diff-PAT, an acoustic hologram optimisation platform with automatic differentiation. We show that in the most fundamental case of optimizing the output amplitude to match the target amplitude; our method with only phase modulation achieves better performance than conventional algorithm with both amplitude and phase modulation. The performance of Diff-PAT was evaluated by randomly generating 1000 sets of up to 32 control points for single-sided arrays and single-axis arrays. This optimisation platform for acoustic hologram can be used in a wide range of applications of PATs without introducing any changes to existing systems that control the PATs. In addition, we applied Diff-PAT to a phase plate and achieved an increase of > 8 dB in the peak noise-to-signal ratio of the acoustic hologram.

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Section: Application Of Diff-pat For Acoustic Metamaterialsmentioning

confidence: 99%

Acoustic hologram optimisation using automatic differentiation

Fushimi

Yamamoto

Ochiai

2021

Sci Rep

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“…Despite the ubiquity of the phased arrays, the majority of them are airborne systems. Previously, the acoustic tweezers for waterborne applications have been either limited to 2-D microchannels [12] or enclosed volumes inside bulk resonant chambers [13]. In the case of microchannels, the tweezers are confined to surface manipulation of micro-agents [4].…”

Section: Introductionmentioning

confidence: 99%

SonoTweezer: An Acoustically Powered End-Effector for Underwater Micromanipulation

Mohanty

Fidder

Matos

et al. 2022

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Recent advances in contactless micromanipulation strategies have revolutionized prospects of robotic manipulators as next-generation tools for minimally invasive surgeries. In particular, acoustically powered phased arrays offer dexterous means of manipulation both in air and water. Inspired by these phased arrays, we present SonoTweezer: a compact, low-power, and lightweight array of immersible ultrasonic transducers capable of trapping and manipulation of sub-mm sized agents underwater. Based on a parametric investigation with numerical pressure field simulations, we design and create a sixtransducer configuration, which is small compared to other reported multi-transducer arrays (16-256 elements). Despite the small size of array, SonoTweezer can reach pressure magnitudes of 300 kPa at a low supply voltage of 25 V to the transducers, which is in the same order of absolute pressure as multi-transducer arrays. Subsequently, we exploit the compactness of our array as an end-effector tool for a robotic manipulator to demonstrate long-range actuation of sub-millimeter agents over a hundred times the agent's body length. Furthermore, a phase-modulation over its individual transducers allows our array to locally maneuver its target agents at sub-mm steps. The ability to manipulate agents underwater makes SonoTweezer suitable for clinical applications considering water's similarity to biological media, e.g., vitreous humor and blood plasma. Finally, we show trapping and manipulation of micro-agents under medical ultrasound (US) imaging modality. This application of our Manuscript

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“…Despite the ubiquity of the phased arrays, the majority of them are airborne systems. Previously, the acoustic tweezers for waterborne applications have been either limited to 2-D microchannels [91], or enclosed volumes inside bulk resonant 5.1 Introduction chambers [295]. In the case of microchannels, the tweezers are confined to surface manipulation of micro-agents [59].…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication and actuation of magneto-acoustic microrobots: een deel magnetisch, een ander deel akoestisch, allebei fantastisch

Mohanty

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Bridging the fictional world of "Fantastic Voyage" to modern-day clinical applications, microrobots extend the outreach of minimally-invasive surgeries. Recent micromanipulation strategies have led to a plethora of microrobotic designs that remotely harvest energy from external sources. Such remote actuation empowers microrobots to perform various tasks in hardto-reach environments such as biological vasculatures, microfluidic channels and cell cultures. Besides, these microrobots have the potential to replace large-scale mechanical instruments and make clinical procedures less invasive. However, there are considerable challenges in the synthesis and actuation of microrobots in order to be deployed for the aforementioned applications. Unlike macro-scale robots, microrobots cannot be easily tethered and powered with external peripheral electronics. Hence, microrobots derive energy from indirect physical forces (e.g., magnetism, acoustics, optics) or chemical reactions (e.g., peroxide decomposition, photocatalysis of noble metals, glucose oxidation) in order to move autonomously. The prevalence of existing clinical technologies like magnetic resonance and medical ultrasound imaging complement magnetics and acoustics, respectively, as indirect physical means of contactless manipulation.Among the two means of indirect actuation, magnetic actuation is the most popular approach employed to power microrobots. Inspired from the swimming mechanics of microorganisms (e.g., Escherichia coli, Spermatozoa, Spirulina platensis) countless designs of magnetically-powered microrobots have been reported over the past decade. Despite this popularity, it becomes challenging to design and fabricate different components of microrobots at micro-and nano-scale that move in response to magnetic forces. Moreover, various forms of magnetic actuation require heavy, bulky and power-consuming permanent or electromagnets as hardware. These hardware requirements often impose thermal constraints due to energy dissipation, or electrical bandwidth constraints which may limit speed of the applied actuation. In order to overcome these limitations, acoustic manipulation strategies are investigated as alternative means for contactless actuation of microrobots. Particularly, the versatile nature of acoustic manipulation strategies benefits diverse scenarios that range from i microfluidic-and levitation-based systems, to bubble-powered microrobots. Furthermore, acoustic microrobots can also collaborate with the traditional magnetic actuation and give rise to a hybrid magneto-acoustic micromanipulation strategy. This doctoral thesis describes a mix of magnetically-and acoustically-powered microrobots, and their respective actuation strategies. The chapters presented in this thesis embark the reader on a journey starting with the long-established magnetic microrobots, pass through different pit stops of acoustic microrobotic systems, and finally end where magnetic and acoustic microrobots join forces. This doctoral thesis is divided into four parts and ei...

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Aligning high-aspect ratio particles in user-specified orientations with ultrasound directed self-assembly

Cited by 3 publications

References 0 publications

Acoustic hologram optimisation using automatic differentiation

Acoustic hologram optimisation using automatic differentiation

SonoTweezer: An Acoustically Powered End-Effector for Underwater Micromanipulation

Design, fabrication and actuation of magneto-acoustic microrobots: een deel magnetisch, een ander deel akoestisch, allebei fantastisch

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