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Micromachines
Special Issues
Acoustofluidics: Applications, Phenomena and Fabrication Technique
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Acoustofluidics: Applications, Phenomena and Fabrication Technique

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (1 December 2022) | Viewed by 5273

Special Issue Editor

Dr. Amgad Rezk

E-Mail Website
Guest Editor
Chemical and Environmental Engineering, RMIT University, Melbourne, VIC 3000, Australia
Interests: surface acoustic waves; microfluidics; 2D materials; nanomaterial synthesis; acoustofluidics

Special Issue Information

Dear Colleagues,

Surface and bulk acoustic wave coupling to fluids at a milli-, micro-, and the nano-scale has uncovered a myriad of intriguing phenomena and has inspired many applications with a high impact commercialization potential. Acoustic-to-fluid (acoustofluidic) interactions have demonstrated a wide range of applications ranging from sensing to chemical analysis and micro-/nano-particle actuation to fluid interface manipulation, such as jetting and nebulization. In addition, the emerging fabrication techniques of the acoustic transducers and reservoirs (made out of 3D printing materials or elastomers, such as PDMS) have propelled the field to demonstrate many practical applications relevant to the lab-on-a-Chip vision. The aim of this Special Issue is to showcase and solicit recent research papers, short communications, and perspective review articles related to acoustofluidic discoveries, novel fabrication techniques, and relevant applications, for example, in particle sorting, fluid mixing, jetting, atomization, micro-/nano-particle synthesis.

Dr. Amgad Rezk
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Surface acoustic waves
  • Bulk acoustic waves
  • Microfluidics
  • Nanofluidics
  • Acoustofluidics
  • Sensing
  • Mixing
  • Jetting
  • Atomization
  • Synthesis

Published Papers (3 papers)

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Research

16 pages, 5926 KiB  
Article
Continuous Particle Aggregation and Separation in Acoustofluidic Microchannels Driven by Standing Lamb Waves
by Jin-Chen Hsu and Chih-Yu Chang
Micromachines 2022, 13(12), 2175; https://doi.org/10.3390/mi13122175 - 8 Dec 2022
Viewed by 1373
Abstract
In this study, we realize acoustic aggregation and separation of microparticles in fluid channels driven by standing Lamb waves of a 300-μm-thick double-side polished lithium-niobate (LiNbO3) plate. We demonstrate that the counter-propagating lowest-order antisymmetric and symmetric Lamb modes can be excited [...] Read more.
In this study, we realize acoustic aggregation and separation of microparticles in fluid channels driven by standing Lamb waves of a 300-μm-thick double-side polished lithium-niobate (LiNbO3) plate. We demonstrate that the counter-propagating lowest-order antisymmetric and symmetric Lamb modes can be excited by double interdigitated transducers on the LiNbO3 plate to produce interfacial coupling with the fluid in channels. Consequently, the solid–fluid coupling generates radiative acoustic pressure and streaming fields to actuate controlled acoustophoretic motion of particles by means of acoustic radiation and Stokes drag forces. We conducted finite-element simulations based on the acoustic perturbation theory with full-wave modeling to tailor the acoustic and streaming fields in the channels driven by the standing Lamb waves. As a result, the acoustic process and the mechanism of particle aggregation and separation were elucidated. Experiments on acoustic manipulation of particles in channels validate the capability of aggregation and separation by the designed devices. It is observed that strong streaming dominates the particle aggregation while the acoustic radiation force differentially expels particles with different sizes from pressure antinodes to achieve continuous particle separation. This study paves the way for Lamb-wave acoustofluidics and may trigger more innovative acoustofluidic systems driven by Lamb waves and other manipulating approaches incorporated on a thin-plate platform. Full article
(This article belongs to the Special Issue Acoustofluidics: Applications, Phenomena and Fabrication Technique)
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13 pages, 10178 KiB  
Article
Formation of a 3D Particle Array Actuated by Ultrasonic Traveling Waves in a Regular Polygon Resonator
by Fei Wan, Kai Xu, Hongcheng Wang, Haihao Xu, A’long Huang, Zihao Bai, Linan Zhang and Liqun Wu
Micromachines 2022, 13(11), 2003; https://doi.org/10.3390/mi13112003 - 17 Nov 2022
Viewed by 1229
Abstract
Acoustic radiation forces have been extensively studied regarding static particles, cell patterning, and dynamic transportation. Compared with standing wave manipulation, traveling wave manipulation can be more easily modulated in real time and has no matching requirement between the size of the resonant cavity [...] Read more.
Acoustic radiation forces have been extensively studied regarding static particles, cell patterning, and dynamic transportation. Compared with standing wave manipulation, traveling wave manipulation can be more easily modulated in real time and has no matching requirement between the size of the resonant cavity and the sound frequency. In this work, we present an efficient, multi-layer microparticle pattern technique in a 3D polygon cavity with a traveling bulk acoustic wave. There are two types of excitation modes: the interval excitation mode (IEM) and the adjacent excitation mode (AEM). We conducted theoretical and simulation analyses, and our results show that both of these modes can form particle arrays in the resonant cavity, which is in accordance with the experimental results. The array spacings in the IEM and AEM were about 0.8 mm and 1.3 mm, respectively, while the acoustic frequency was 1MHz. Double-layer particle patterns were arrayed by a double in the resonant cavity. The spacing between the two layers was set at 3.0 mm. The line spacings were about 0.4 mm in both layers. The line width was 0.2 mm, which was larger than the single layer. The results show that ultrasonic traveling waves are a feasible method to manipulate particles and cells that form 3D patterns in particle–fluid flows. Full article
(This article belongs to the Special Issue Acoustofluidics: Applications, Phenomena and Fabrication Technique)
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11 pages, 2398 KiB  
Article
Effect of Ultrasonic Excitation on Discharge Performance of a Button Zinc–Air Battery
by Zhao Luo, Qiang Tang and Junhui Hu
Micromachines 2021, 12(7), 792; https://doi.org/10.3390/mi12070792 - 2 Jul 2021
Cited by 4 | Viewed by 1910
Abstract
In this paper, a method to increase the output power of a button zinc–air battery by applying acoustofluidics induced by ultrasonic excitation to the battery is proposed and demonstrated. In the structural design of the device, a flat piezoelectric ring was bonded onto [...] Read more.
In this paper, a method to increase the output power of a button zinc–air battery by applying acoustofluidics induced by ultrasonic excitation to the battery is proposed and demonstrated. In the structural design of the device, a flat piezoelectric ring was bonded onto the top of the outer surface of the cathode shell to excite an ultrasonic field in the battery. The maximum output power of the zinc–air battery increased by 46.8% when the vibration velocity and working frequency were 52.8 mm/s (the corresponding vibration amplitude was 277 nm) and 161.2 kHz and the rating capacity increased by about 20% with the assistance of the acoustofluidic field induced by ultrasonic excitation. Further analyses indicated that the discharge performance improvement can be attributed to the acoustic microstreaming vortices and the decrease of the viscosity coefficient in the electrolyte solution, which were both caused by ultrasonic excitation of the piezoelectric ring. Full article
(This article belongs to the Special Issue Acoustofluidics: Applications, Phenomena and Fabrication Technique)
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