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Xu M, Vidler C, Wang J, Chen X, Pan Z, Harley WS, Lee PVS, Collins DJ. Micro- Acoustic Holograms for Detachable Microfluidic Devices. Small 2024:e2307529. [PMID: 38174594 DOI: 10.1002/smll.202307529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/24/2023] [Indexed: 01/05/2024]
Abstract
Acoustic microfluidic devices have advantages for diagnostic applications, therapeutic solutions, and fundamental research due to their contactless operation, simple design, and biocompatibility. However, most acoustofluidic approaches are limited to forming simple and fixed acoustic patterns, or have limited resolution. In this study,a detachable microfluidic device is demonstrated employing miniature acoustic holograms to create reconfigurable, flexible, and high-resolution acoustic fields in microfluidic channels, where the introduction of a solid coupling layer makes these holograms easy to fabricate and integrate. The application of this method to generate flexible acoustic fields, including shapes, characters, and arbitrarily rotated patterns, within microfluidic channels, is demonstrated.
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Affiliation(s)
- Mingxin Xu
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Callum Vidler
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Jizhen Wang
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Xi Chen
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Zijian Pan
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - William S Harley
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Peter V S Lee
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
- Graeme Clarke Institute, University of Melbourne, Parkville, Victoria, 3052, Australia
| | - David J Collins
- Department of Biomedical Engineering, University of Melbourne, Melbourne, Victoria, 3010, Australia
- Graeme Clarke Institute, University of Melbourne, Parkville, Victoria, 3052, Australia
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Xu M, Wang J, Harley WS, Lee PVS, Collins DJ. Programmable Acoustic Holography using Medium-Sound-Speed Modulation. Adv Sci (Weinh) 2023; 10:e2301489. [PMID: 37283454 PMCID: PMC10427405 DOI: 10.1002/advs.202301489] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/10/2023] [Indexed: 06/08/2023]
Abstract
Acoustic holography offers the ability to generate designed acoustic fields to manipulate microscale objects. However, the static nature or large aperture sizes of 3D printed acoustic holographic phase plates limits the ability to rapidly alter generated fields. In this work, a programmable acoustic holography approach is demonstrated by which multiple discrete or continuously variable acoustic targets can be created. Here, the holographic phase plate encodes multiple images, where the desired field is produced by modifying the sound speed of an intervening fluid media. Its flexibility is demonstrated in generating various acoustic patterns, including continuous line segments, discrete letters and numbers, using this method as a sound speed indicator and fluid identification tool. This programmable acoustic holography approach has the advantages of generating reconfigurable and designed acoustic fields, with broad potential in microfluidics, cell/tissue engineering, real-time sensing, and medical ultrasound.
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Affiliation(s)
- Mingxin Xu
- Department of Biomedical EngineeringUniversity of MelbourneMelbourneVictoria3010Australia
| | - Jizhen Wang
- Department of Biomedical EngineeringUniversity of MelbourneMelbourneVictoria3010Australia
| | - William S. Harley
- Department of Biomedical EngineeringUniversity of MelbourneMelbourneVictoria3010Australia
| | - Peter V. S. Lee
- Department of Biomedical EngineeringUniversity of MelbourneMelbourneVictoria3010Australia
- Graeme Clarke InstituteUniversity of MelbourneParkvilleVictoria3052Australia
| | - David J. Collins
- Department of Biomedical EngineeringUniversity of MelbourneMelbourneVictoria3010Australia
- Graeme Clarke InstituteUniversity of MelbourneParkvilleVictoria3052Australia
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Abstract
Dynamic acoustic wavefront control is essential for many acoustic applications, including biomedical imaging and particle manipulation. Conventional methods are either static or in the case of phased transducer arrays are limited to a few elements and hence limited control. Here, a dynamic acoustic wavefront control method based on light patterns that locally trigger the generation of microbubbles is introduced. As a small gas bubble can effectively stop ultrasound transmission in a liquid, the optical images are used to drive a short electrolysis and form microbubble patterns. The generation of microbubbles is controlled by structured light projection at a low intensity of 65 mW cm-2 and only requires about 100 ms. The bubble pattern is thus able to modify the wavefront of acoustic waves from a single transducer. The method is employed to realize an acoustic projector that can generate various acoustic images and patterns, including multiple foci and acoustic phase gradients. Hydrophone scans show that the acoustic field after the modulation by the microbubble pattern forms according to the prediction. It is believed that combining a versatile optical projector to realize an ultrasound projector is a general scheme, which can benefit a multitude of applications based on dynamic acoustic fields.
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Affiliation(s)
- Zhichao Ma
- Max Planck Institute for Intelligent SystemsHeisenbergstr. 3Stuttgart70569Germany
| | - Hyungmok Joh
- Materials Science and Engineering ProgramTexas Materials InstituteThe University of Texas at AustinAustinTX78712USA
| | - Donglei Emma Fan
- Materials Science and Engineering ProgramTexas Materials InstituteThe University of Texas at AustinAustinTX78712USA
- Walker Department of Mechanical EngineeringThe University of Texas at AustinAustinTX78712USA
| | - Peer Fischer
- Max Planck Institute for Intelligent SystemsHeisenbergstr. 3Stuttgart70569Germany
- Institute of Physical ChemistryUniversity of StuttgartPfaffenwaldring 55Stuttgart70569Germany
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