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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 (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2307529. [PMID: 38174594 DOI: 10.1002/smll.202307529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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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Feng Y, Liu Y, Deng J, Liu J. Suppression of the height deviation on metal bumps manufacturing by an ultrasonic vibration control. ULTRASONICS 2024; 138:107270. [PMID: 38377830 DOI: 10.1016/j.ultras.2024.107270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 01/04/2024] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
On-demand droplet printing based on piezoelectric micro-jet device (PMJD) is considered a flexible and high-precision method to generate metal droplets directly for flip-chip bonding in industrial electronics. However, the quality of flip-chip bonding is closely related to the height deviation of the solidified droplets (the metal bumps), which is influenced by the complicated hydrodynamics of impacting and oscillation of the droplet with oxide film. Here, the numerical and experimental investigations are first conducted to study the effect of the liquid bridge and deposition parameters on the height deviation of the solidified droplets. The rapid oxidation of the liquid bridge and under-oscillation during the deposition process are the main reasons for height deviation. In addition, the undamped oscillation with high-speed impact and instantaneous solidification also deteriorates the height deviation. To this end, an oscillation control strategy based on ultrasonic-assisted metal droplet deposition (UAMDD) is proposed and verified to be a reliable regulation strategy to suppress the height deviation of the printed bumps. The effective regulating range of height deviation is studied experimentally by changing the ultrasonic vibration amplitude. Finally, a 10 × 10 array composed of 100 solidified metal droplets is printed with the UAMDD, which has the height deviation of 554 ± 6 μm. And the dimensionless height deviation (Δh/h) of solidified bumps is stayed below 2.1 %.
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Affiliation(s)
- Yuming Feng
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
| | - Yingxiang Liu
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China.
| | - Jie Deng
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
| | - Junkao Liu
- State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
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Wu H, Zhou C, Li Y, Jin Y, Lai X, Ohl CD, Li D, Yu H. Mechanisms underlying the influence of skin properties on a single cavitation bubble in low-frequency sonophoresis. ULTRASONICS SONOCHEMISTRY 2023; 101:106690. [PMID: 37948892 PMCID: PMC10663890 DOI: 10.1016/j.ultsonch.2023.106690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/26/2023] [Accepted: 11/06/2023] [Indexed: 11/12/2023]
Abstract
As a safe and effective method for systemic transdermal drug delivery (TDD), sonophoresis has drawn much attention from researchers. Despite numerous studies confirming cavitation as the main reason for sonophoresis, the effect skin has on cavitation bubble dynamics remains elusive due to the difficulty of experimental challenges. For a start, we reveal how single cavitation bubble (SCB) dynamics are affected by skin properties, including elasticity, hydrophilicity and texture. We use polydimethylsiloxane (PDMS) to simulate human skin and record the temporary evolution of SCBs with synchronous ultrafast photography. The influences of skin properties on SCBs are concluded: 1) SCBs collapse later near walls with better elasticities and generate microjets with higher speed; 2) SCBs collapse later near hydrophilic walls with slower microjets; and 3) the existence of a texture structure on walls also delays the time of bubble collapse near them and slows the velocities of microjets (v) during collapses.
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Affiliation(s)
- Hao Wu
- School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, PR China; Department of Soft Matter, Institute of Physics, Otto-von-Guericke University, Magdeburg 39106, Germany; Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
| | - Cheng Zhou
- School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, PR China
| | - Yuanyuan Li
- Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
| | - Yongzhen Jin
- Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
| | - Xiaochen Lai
- School of Automation, Nanjing University of Information Science & Technology, Nanjing 210044, PR China
| | - Claus-Dieter Ohl
- Department of Soft Matter, Institute of Physics, Otto-von-Guericke University, Magdeburg 39106, Germany
| | - Dachao Li
- School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, PR China
| | - Haixia Yu
- School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, PR China.
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