1
|
Godary T, Binkley B, Liu Z, Awoyemi O, Overby A, Yuliantoro H, Fike BJ, Anderson S, Li P. Acoustofluidics: Technology Advances and Applications from 2022 to 2024. Anal Chem 2025; 97:6847-6870. [PMID: 40133046 PMCID: PMC11983376 DOI: 10.1021/acs.analchem.4c06803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2024] [Revised: 02/27/2025] [Accepted: 03/13/2025] [Indexed: 03/27/2025]
Affiliation(s)
| | | | - Zhengru Liu
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Olanrewaju Awoyemi
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Amanda Overby
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Herbi Yuliantoro
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Bethany J. Fike
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Sydney Anderson
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| | - Peng Li
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown 26506-6201, West Virginia, United States
| |
Collapse
|
2
|
Mahkam N, Ugurlu MC, Kalva SK, Aghakhani A, Razansky D, Sitti M. Multiorifice acoustic microrobot for boundary-free multimodal 3D swimming. Proc Natl Acad Sci U S A 2025; 122:e2417111122. [PMID: 39841149 PMCID: PMC11789062 DOI: 10.1073/pnas.2417111122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2024] [Accepted: 12/17/2024] [Indexed: 01/23/2025] Open
Abstract
The emerging new generation of small-scaled acoustic microrobots is poised to expedite the adoption of microrobotics in biomedical research. Recent designs of these microrobots have enabled intricate bioinspired motions, paving the way for their real-world applications. We present a multiorifice design of air-filled spherical microrobots that convert acoustic wave energy to efficient propulsion through a resonant encapsulated microbubble. These microrobots can swim boundary-free in three-dimensional (3D) space while switching between various frequency-dependent locomotion modes. We explore the locomotion dynamics of microrobots with diameters ranging from 10 μm to 100 μm, focusing on their boundary-free 3D swimming and multimodal locomotion in response to acoustic stimuli below 1 MHz. Further, we elucidate the dynamics of these microrobots, featuring a single multiorifice cavity, which contributes to complex acoustic streaming and facilitates swift, unrestricted movements. Finally, we demonstrate that incorporating microrobots with additional nickel and gold layers significantly enhances their steering and visibility in optoacoustic and ultrasound imaging, enabling the development of the next generation of microrobots in healthcare applications.
Collapse
Affiliation(s)
- Nima Mahkam
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart70569, Germany
- Department of Information Technology and Electrical Engineering, Institute for Biomedical Engineering, ETH Zurich, Zurich8093, Switzerland
| | - Musab C. Ugurlu
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart70569, Germany
| | - Sandeep Kumar Kalva
- Department of Information Technology and Electrical Engineering, Institute for Biomedical Engineering, ETH Zurich, Zurich8093, Switzerland
- Institute of Pharmacology and Toxicology, Faculty of Medicine, University of Zurich, Zurich8057, Switzerland
| | - Amirreza Aghakhani
- Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Stuttgart70569, Germany
| | - Daniel Razansky
- Department of Information Technology and Electrical Engineering, Institute for Biomedical Engineering, ETH Zurich, Zurich8093, Switzerland
- Institute of Pharmacology and Toxicology, Faculty of Medicine, University of Zurich, Zurich8057, Switzerland
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart70569, Germany
- School of Medicine, Koç University, Istanbul34450, Türkiye
- College of Engineering, Koç University, Istanbul34450, Türkiye
| |
Collapse
|
3
|
Han H, Ma X, Deng W, Zhang J, Tang S, Pak OS, Zhu L, Criado-Hidalgo E, Gong C, Karshalev E, Yoo J, You M, Liu A, Wang C, Shen HK, Patel PN, Hays CL, Gunnarson PJ, Li L, Zhang Y, Dabiri JO, Wang LV, Shapiro MG, Wu D, Zhou Q, Greer JR, Gao W. Imaging-guided bioresorbable acoustic hydrogel microrobots. Sci Robot 2024; 9:eadp3593. [PMID: 39661698 DOI: 10.1126/scirobotics.adp3593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Accepted: 11/11/2024] [Indexed: 12/13/2024]
Abstract
Micro- and nanorobots excel in navigating the intricate and often inaccessible areas of the human body, offering immense potential for applications such as disease diagnosis, precision drug delivery, detoxification, and minimally invasive surgery. Despite their promise, practical deployment faces hurdles, including achieving stable propulsion in complex in vivo biological environments, real-time imaging and localization through deep tissue, and precise remote control for targeted therapy and ensuring high therapeutic efficacy. To overcome these obstacles, we introduce a hydrogel-based, imaging-guided, bioresorbable acoustic microrobot (BAM) designed to navigate the human body with high stability. Constructed using two-photon polymerization, a BAM comprises magnetic nanoparticles and therapeutic agents integrated into its hydrogel matrix for precision control and drug delivery. The microrobot features an optimized surface chemistry with a hydrophobic inner layer to substantially enhance microbubble retention in biofluids with multiday functionality and a hydrophilic outer layer to minimize aggregation and promote timely degradation. The dual-opening bubble-trapping cavity design enables a BAM to maintain consistent and efficient acoustic propulsion across a range of biological fluids. Under focused ultrasound stimulation, the entrapped microbubbles oscillate and enhance the contrast for real-time ultrasound imaging, facilitating precise tracking and control of BAM movement through wireless magnetic navigation. Moreover, the hydrolysis-driven biodegradability of BAMs ensures its safe dissolution after treatment, posing no risk of long-term residual harm. Thorough in vitro and in vivo experimental evidence demonstrates the promising capabilities of BAMs in biomedical applications. This approach shows promise for advancing minimally invasive medical interventions and targeted therapeutic delivery.
Collapse
Affiliation(s)
- Hong Han
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Xiaotian Ma
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Weiting Deng
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
- Kavli Nanoscience Institute, California Institute of Technology, Pasadena, CA, USA
| | - Junhang Zhang
- Alfred E. Mann Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Songsong Tang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - On Shun Pak
- Department of Mechanical Engineering, Santa Clara University, Santa Clara, CA, USA
| | - Lailai Zhu
- Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore
| | - Ernesto Criado-Hidalgo
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Chen Gong
- Alfred E. Mann Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Emil Karshalev
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Jounghyun Yoo
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Ming You
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Ann Liu
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Canran Wang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Hao K Shen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Payal N Patel
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Claire L Hays
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Peter J Gunnarson
- Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA, USA
- Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Lei Li
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Yang Zhang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - John O Dabiri
- Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA, USA
- Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Lihong V Wang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Mikhail G Shapiro
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
- Howard Hughes Medical Institute, Pasadena, CA, USA
| | - Di Wu
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Qifa Zhou
- Alfred E. Mann Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA
| | - Julia R Greer
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
- Kavli Nanoscience Institute, California Institute of Technology, Pasadena, CA, USA
| | - Wei Gao
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| |
Collapse
|
4
|
Agrawal P, Zhuang S, Dreher S, Mitter S, Ahmed D. SonoPrint: Acoustically Assisted Volumetric 3D Printing for Composites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2408374. [PMID: 39049689 DOI: 10.1002/adma.202408374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Indexed: 07/27/2024]
Abstract
Advances in additive manufacturing in composites have transformed aerospace, medical devices, tissue engineering, and electronics. A key aspect of enhancing properties of 3D-printed objects involves fine-tuning the material by embedding and orienting reinforcement within the structure. Existing methods for orienting these reinforcements are limited by pattern types, alignment, and particle characteristics. Acoustics offers a versatile method to control the particles independent of their size, geometry, and charge, enabling intricate pattern formations. However, integrating acoustics into 3D printing has been challenging due to the scattering of the acoustic field between polymerized layers and unpolymerized resin, resulting in unwanted patterns. To address this challenge, SonoPrint, an innovative acoustically assisted volumetric 3D printer is developed that enables simultaneous reinforcement patterning and printing of the entire structure. SonoPrint generates mechanically tunable composite geometries by embedding reinforcement particles, such as microscopic glass, metal, and polystyrene, within the fabricated structure. This printer employs a standing wave field to create targeted particle motifs-including parallel lines, radial lines, circles, rhombuses, hexagons, and polygons-directly in the photosensitive resin, completing the print in just a few minutes. SonoPrint enhances structural properties and promises to advance volumetric printing, unlocking applications in tissue engineering, biohybrid robots, and composite fabrication.
Collapse
Affiliation(s)
- Prajwal Agrawal
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Shengyang Zhuang
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Simon Dreher
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Sarthak Mitter
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Daniel Ahmed
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| |
Collapse
|
5
|
Castro-Ávila E, Malgaretti P, Harting J, Muñoz JD. Lattice Boltzmann approach for acoustic manipulation. Phys Rev E 2024; 110:025304. [PMID: 39294982 DOI: 10.1103/physreve.110.025304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 07/10/2024] [Indexed: 09/21/2024]
Abstract
We employ a lattice Boltzmann method to compute the acoustic radiation force produced by standing waves on a compressible object for the density matched case. Instead of simulating the fluid mechanics equations directly, the proposed method uses a lattice Boltzmann model that reproduces the wave equation, together with a kernel interpolation scheme, to compute the first-order perturbations of the pressure and velocity fields on the object's surface and, from them, the acoustic radiation force. The procedure reproduces with excellent accuracy the theoretical expressions by Gor'kov and Wei for the sphere as the 3D case and an infinitely long cylinder as the 2D case, respectively, even with a modest number of lattice Boltzmann cells. The proposed method shows to be a promising tool for simulating phenomena where the acoustic radiation force plays a relevant role, like acoustic tweezers or the acoustic manipulation of microswimmers, with applications in medicine and engineering.
Collapse
|
6
|
Orazbayev B, Malléjac M, Bachelard N, Rotter S, Fleury R. Wave-momentum shaping for moving objects in heterogeneous and dynamic media. NATURE PHYSICS 2024; 20:1441-1447. [PMID: 39282552 PMCID: PMC11392811 DOI: 10.1038/s41567-024-02538-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 05/10/2024] [Indexed: 09/19/2024]
Abstract
Light and sound waves can move objects through the transfer of linear or angular momentum, which has led to the development of optical and acoustic tweezers, with applications ranging from biomedical engineering to quantum optics. Although impressive manipulation results have been achieved, the stringent requirement for a highly controlled, low-reverberant and static environment still hinders the applicability of these techniques in many scenarios. Here we overcome this challenge and demonstrate the manipulation of objects in disordered and dynamic media by optimally tailoring the momentum of sound waves iteratively in the far field. The method does not require information about the object's physical properties or the spatial structure of the surrounding medium but relies only on a real-time scattering matrix measurement and a positional guide-star. Our experiment demonstrates the possibility of optimally moving and rotating objects to extend the reach of wave-based object manipulation to complex and dynamic scattering media. We envision new opportunities for biomedical applications, sensing and manufacturing.
Collapse
Affiliation(s)
- Bakhtiyar Orazbayev
- Physics Department, School of Sciences and Humanities, Nazarbayev University, Astana, Kazakhstan
- Laboratory of Wave Engineering, School of Engineering, EPFL, Lausanne, Switzerland
| | - Matthieu Malléjac
- Laboratory of Wave Engineering, School of Engineering, EPFL, Lausanne, Switzerland
| | - Nicolas Bachelard
- Université de Bordeaux, CNRS, LOMA, UMR5798, Talence, France
- Institute of Theoretical Physics, Vienna University of Technology (TU Wien), Vienna, Austria
| | - Stefan Rotter
- Institute of Theoretical Physics, Vienna University of Technology (TU Wien), Vienna, Austria
| | - Romain Fleury
- Laboratory of Wave Engineering, School of Engineering, EPFL, Lausanne, Switzerland
| |
Collapse
|
7
|
Sun M, Yang S, Jiang J, Wang Q, Zhang L. Multiple Magneto-Optical Microrobotic Collectives with Selective Control in Three Dimensions Under Water. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310769. [PMID: 38263803 PMCID: PMC11497316 DOI: 10.1002/smll.202310769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 12/29/2023] [Indexed: 01/25/2024]
Abstract
Inspired by natural swarms, various methods are developed to create artificial magnetic microrobotic collectives. However, these magnetic collectives typically receive identical control inputs from a common external magnetic field, limiting their ability to operate independently. And they often rely on interfaces or boundaries for controlled movement, posing challenges for independent, three-dimensional(3D) navigation of multiple magnetic collectives. To address this challenge, self-assembled microrobotic collectives are proposed that can be selectively actuated in a combination of external magnetic and optical fields. By harnessing both actuation methods, the constraints of single actuation approaches are overcome. The magnetic field excites the self-assembly of colloids and maintains the self-assembled microrobotic collectives without disassembly, while the optical field drives selected microrobotic collectives to perform different tasks. The proposed magnetic-photo microrobotic collectives can achieve independent position and path control in the two-dimensional (2D) plane and 3D space. With this selective control strategy, the microrobotic collectives can cooperate in convection and mixing the dye in a confined space. The results present a systematic approach for realizing selective control of multiple microrobotic collectives, which can address multitasking requirements in complex environments.
Collapse
Affiliation(s)
- Mengmeng Sun
- Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong KongChina
- Physical Intelligence DepartmentMax Planck Institute for Intelligent SystemsHeisenbergstr. 370569StuttgartGermany
| | - Shihao Yang
- Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong KongChina
| | - Jialin Jiang
- Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong KongChina
| | - Qianqian Wang
- Chow Yuk Ho Technology Center for Innovative MedicineThe Chinese University of Hong KongHong KongChina
| | - Li Zhang
- Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong KongChina
- Multi‐Scale Medical Robotics CenterHong Kong Science ParkShatin NTHong Kong SARChina
- Department of SurgeryThe Chinese University of Hong KongHong KongChina
- CUHK T Stone Robotics InstituteThe Chinese University of Hong KongHong KongChina
- School of Mechanical EngineeringSoutheast UniversityNanjing211189China
| |
Collapse
|
8
|
Chen W, Xia M, Zhu W, Xu Z, Cai B, Shen H. A bio-fabricated tesla valves and ultrasound waves-powered blood plasma viscometer. Front Bioeng Biotechnol 2024; 12:1394373. [PMID: 38720878 PMCID: PMC11076727 DOI: 10.3389/fbioe.2024.1394373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 04/11/2024] [Indexed: 05/12/2024] Open
Abstract
Introduction: There is clinical evidence that the fresh blood viscosity is an important indicator in the development of vascular disorder and coagulation. However, existing clinical viscosity measurement techniques lack the ability to measure blood viscosity and replicate the in-vivo hemodynamics simultaneously. Methods: Here, we fabricate a novel digital device, called Tesla valves and ultrasound waves-powered blood plasma viscometer (TUBPV) which shows capacities in both viscosity measurement and coagulation monitoring. Results: Based on the Hagen-Poiseuille equation, viscosity analysis can be faithfully performed by a video microscopy. Tesla-like channel ensured unidirectional liquid motion with stable pressure driven that was triggered by the interaction of Tesla valve structure and ultrasound waves. In few seconds the TUBPV can generate an accurate viscosity profile on clinic fresh blood samples from the flow time evaluation. Besides, Tesla-inspired microchannels can be used in the real-time coagulation monitoring. Discussion: These results indicate that the TUBVP can serve as a point-of-care device in the ICU to evaluate the blood's viscosity and the anticoagulation treatment.
Collapse
Affiliation(s)
- Wenqin Chen
- Department of Clinical Laboratory, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
| | - Mao Xia
- Department of Clinical Laboratory, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
| | - Wentao Zhu
- School of Environment and Health, Jianghan University, Wuhan, China
| | - Zhiye Xu
- Department of Clinical Laboratory, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
| | - Bo Cai
- School of Environment and Health, Jianghan University, Wuhan, China
| | - Han Shen
- Department of Clinical Laboratory, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
| |
Collapse
|
9
|
Wu G, Xian W, You Q, Zhang J, Chen X. AcousticRobots: Smart acoustically powered micro-/nanoswimmers for precise biomedical applications. Adv Drug Deliv Rev 2024; 207:115201. [PMID: 38331256 DOI: 10.1016/j.addr.2024.115201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/24/2023] [Accepted: 02/02/2024] [Indexed: 02/10/2024]
Abstract
Although nanotechnology has evolutionarily progressed in biomedical field over the past decades, achieving satisfactory therapeutic effects remains difficult with limited delivery efficiency. Ultrasound could provide a deep penetration and maneuverable actuation to efficiently power micro-/nanoswimmers with little harm, offering an emerging and fascinating alternative to the active delivery platform. Recent advances in novel fabrication, controllable concepts like intelligent swarm and the integration of hybrid propulsions have promoted its function and potential for medical applications. In this review, we will summarize the mechanisms and types of ultrasonically propelled micro/nanorobots (termed here as "AcousticRobots"), including the interactions between AcousticRobots and acoustic field, practical design considerations (e.g., component, size, shape), the synthetic methods, surface modification, controllable behaviors, and the advantages when combined with other propulsion approaches. The representative biomedical applications of functional AcousticRobots are also highlighted, including drug delivery, invasive surgery, eradication on the surrounding bio-environment, cell manipulation, detection, and imaging, etc. We conclude by discussing the challenges and outlook of AcousticRobots in biomedical applications.
Collapse
Affiliation(s)
- Gege Wu
- Department of Diagnostic Radiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore; Nanomedicine Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Wei Xian
- Siansonic Technology Limited, No.1, Xingguang 5th Street, Ciqu, Tongzhou District, Beijing 101111, China
| | - Qing You
- Department of Diagnostic Radiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore; Nanomedicine Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore; Clinical Imaging Research Centre, Centre for Translational Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore.
| | - Jingjing Zhang
- Department of Diagnostic Radiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore; Nanomedicine Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore; Clinical Imaging Research Centre, Centre for Translational Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore.
| | - Xiaoyuan Chen
- Department of Diagnostic Radiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore; Nanomedicine Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore; Clinical Imaging Research Centre, Centre for Translational Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore; Department of Chemical and Biomolecular Engineering, and Department of Biomedical Engineering, College of Design and Engineering, National University of Singapore, Singapore 119074, Singapore; Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research (A*STAR), 61 Biopolis Drive, Proteos, Singapore 138673, Singapore.
| |
Collapse
|
10
|
Ali A, Kim H, Torati SR, Kang Y, Reddy V, Kim K, Yoon J, Lim B, Kim C. Magnetic Lateral Ladder for Unidirectional Transport of Microrobots: Design Principles and Potential Applications of Cells-on-Chip. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2305528. [PMID: 37845030 DOI: 10.1002/smll.202305528] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/23/2023] [Indexed: 10/18/2023]
Abstract
Functionalized microrobots, which are directionally manipulated in a controlled and precise manner for specific tasks, face challenges. However, magnetic field-based controls constrain all microrobots to move in a coordinated manner, limiting their functions and independent behaviors. This article presents a design principle for achieving unidirectional microrobot transport using an asymmetric magnetic texture in the shape of a lateral ladder, which the authors call the "railway track." An asymmetric magnetic energy distribution along the axis allows for the continuous movement of microrobots in a fixed direction regardless of the direction of the magnetic field rotation. The authors demonstrated precise control and simple utilization of this method. Specifically, by placing magnetic textures with different directionalities, an integrated cell/particle collector can collect microrobots distributed in a large area and move them along a complex trajectory to a predetermined location. The authors can leverage the versatile capabilities offered by this texture concept, including hierarchical isolation, switchable collection, programmable pairing, selective drug-response test, and local fluid mixing for target objects. The results demonstrate the importance of microrobot directionality in achieving complex individual control. This novel concept represents significant advancement over conventional magnetic field-based control technology and paves the way for further research in biofunctionalized microrobotics.
Collapse
Affiliation(s)
- Abbas Ali
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - Hyeonseol Kim
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - Sri Ramulu Torati
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
- Center for Bioelectronics, Old Dominion University, Norfolk, VA, 23508, USA
| | - Yumin Kang
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - Venu Reddy
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
- Nanotechnology Research Center, SRKR Engineering College, Bhimavaram, Andhra Pradesh, 534204, India
| | - Keonmok Kim
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - Jonghwan Yoon
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - Byeonghwa Lim
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| | - CheolGi Kim
- Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea
| |
Collapse
|
11
|
Zhang Z, Cao Y, Caviglia S, Agrawal P, Neuhauss SCF, Ahmed D. A vibrating capillary for ultrasound rotation manipulation of zebrafish larvae. LAB ON A CHIP 2024; 24:764-775. [PMID: 38193588 PMCID: PMC10863645 DOI: 10.1039/d3lc00817g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/18/2023] [Indexed: 01/10/2024]
Abstract
Multifunctional micromanipulation systems have garnered significant attention due to the growing interest in biological and medical research involving model organisms like zebrafish (Danio rerio). Here, we report a novel acoustofluidic rotational micromanipulation system that offers rapid trapping, high-speed rotation, multi-angle imaging, and 3D model reconstruction of zebrafish larvae. An ultrasound-activated oscillatory glass capillary is used to trap and rotate a zebrafish larva. Simulation and experimental results demonstrate that both the vibrating mode and geometric placement of the capillary contribute to the developed polarized vortices along the long axis of the capillary. Given its capacities for easy-to-operate, stable rotation, avoiding overheating, and high-throughput manipulation, our system poses the potential to accelerate zebrafish-directed biomedical research.
Collapse
Affiliation(s)
- Zhiyuan Zhang
- Acoustic Robotics Systems Laboratory, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Säumerstrasse 4, CH-8803 Zurich, Switzerland.
| | - Yilin Cao
- Acoustic Robotics Systems Laboratory, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Säumerstrasse 4, CH-8803 Zurich, Switzerland.
| | - Sara Caviglia
- Neuhauss Laboratory, Department of Molecular Life Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Prajwal Agrawal
- Acoustic Robotics Systems Laboratory, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Säumerstrasse 4, CH-8803 Zurich, Switzerland.
| | - Stephan C F Neuhauss
- Neuhauss Laboratory, Department of Molecular Life Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Daniel Ahmed
- Acoustic Robotics Systems Laboratory, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, Säumerstrasse 4, CH-8803 Zurich, Switzerland.
| |
Collapse
|
12
|
Zhang Z, Shi Z, Ahmed D. SonoTransformers: Transformable acoustically activated wireless microscale machines. Proc Natl Acad Sci U S A 2024; 121:e2314661121. [PMID: 38289954 PMCID: PMC10861920 DOI: 10.1073/pnas.2314661121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 12/22/2023] [Indexed: 02/01/2024] Open
Abstract
Shape transformation, a key mechanism for organismal survival and adaptation, has gained importance in developing synthetic shape-shifting systems with diverse applications ranging from robotics to bioengineering. However, designing and controlling microscale shape-shifting materials remains a fundamental challenge in various actuation modalities. As materials and structures are scaled down to the microscale, they often exhibit size-dependent characteristics, and the underlying physical mechanisms can be significantly affected or rendered ineffective. Additionally, surface forces such as van der Waals forces and electrostatic forces become dominant at the microscale, resulting in stiction and adhesion between small structures, making them fracture and more difficult to deform. Furthermore, despite various actuation approaches, acoustics have received limited attention despite their potential advantages. Here, we introduce "SonoTransformer," the acoustically activated micromachine that delivers shape transformability using preprogrammed soft hinges with different stiffnesses. When exposed to an acoustic field, these hinges concentrate sound energy through intensified oscillation and provide the necessary force and torque for the transformation of the entire micromachine within milliseconds. We have created machine designs to predetermine the folding state, enabling precise programming and customization of the acoustic transformation. Additionally, we have shown selective shape transformable microrobots by adjusting acoustic power, realizing high degrees of control and functional versatility. Our findings open new research avenues in acoustics, physics, and soft matter, offering new design paradigms and development opportunities in robotics, metamaterials, adaptive optics, flexible electronics, and microtechnology.
Collapse
Affiliation(s)
- Zhiyuan Zhang
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, ZurichCH-8803, Switzerland
| | - Zhan Shi
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, ZurichCH-8803, Switzerland
| | - Daniel Ahmed
- Acoustic Robotics Systems Lab, Institute of Robotics and Intelligent Systems, Department of Mechanical and Process Engineering, ETH Zurich, ZurichCH-8803, Switzerland
| |
Collapse
|
13
|
Liu Z, Qin B, Shi Z, Wang X, Lv Q, Wei X, Huan R. Nonlinearity-Induced Asymmetric Synchronization Region in Micromechanical Oscillators. MICROMACHINES 2024; 15:238. [PMID: 38398967 PMCID: PMC10891831 DOI: 10.3390/mi15020238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024]
Abstract
Synchronization in microstructures is a widely explored domain due to its diverse dynamic traits and promising practical applications. Within synchronization analysis, the synchronization bandwidth serves as a pivotal metric. While current research predominantly focuses on symmetric evaluations of synchronization bandwidth, the investigation into potential asymmetries within nonlinear oscillators remains unexplored, carrying implications for sensor application performance. This paper conducts a comprehensive exploration employing straight and arch beams capable of demonstrating linear, hardening, and softening characteristics to thoroughly scrutinize potential asymmetry within the synchronization region. Through the introduction of weak harmonic forces to induce synchronization within the oscillator, we observe distinct asymmetry within its synchronization range. Additionally, we present a robust theoretical model capable of fully capturing the linear, hardening, and softening traits of resonators synchronized to external perturbation. Further investigation into the effects of feedback strength and phase delay on synchronization region asymmetry, conducted through analytical and experimental approaches, reveals a consistent alignment between theoretical predictions and experimental outcomes. These findings hold promise in providing crucial technical insights to enhance resonator performance and broaden the application landscape of MEMS (Micro-Electro-Mechanical Systems) technology.
Collapse
Affiliation(s)
- Zhonghua Liu
- Department of Civil Engineering, Xiamen University, Xiamen 361005, China; (Z.L.); (B.Q.)
| | - Bingchan Qin
- Department of Civil Engineering, Xiamen University, Xiamen 361005, China; (Z.L.); (B.Q.)
| | - Zhan Shi
- Department of Mechanics, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
| | - Xuefeng Wang
- Department of Engineering Mechanics, MIIT Key Laboratory of Dynamics and Control of Complex Systems, Northwestern Polytechnical University, Xi’an 710072, China;
| | - Qiangfeng Lv
- Department of Mechanics, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
- Huanjiang Laboratory, Zhuji 311800, China
| | - Xueyong Wei
- State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
| | - Ronghua Huan
- Department of Mechanics, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;
- Huanjiang Laboratory, Zhuji 311800, China
| |
Collapse
|
14
|
Mahkam N, Aghakhani A, Sheehan D, Gardi G, Katzschmann R, Sitti M. Acoustic Streaming-Induced Multimodal Locomotion of Bubble-Based Microrobots. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2304233. [PMID: 37884484 PMCID: PMC10724404 DOI: 10.1002/advs.202304233] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 09/12/2023] [Indexed: 10/28/2023]
Abstract
Acoustically-driven bubbles at the micron scale can generate strong microstreaming flows in its surrounding fluidic medium. The tunable acoustic streaming strength of oscillating microbubbles and the diversity of the generated flow patterns enable the design of fast-moving microrobots with multimodal locomotion suitable for biomedical applications. The acoustic microrobots holding two coupled microbubbles inside a rigid body are presented; trapped bubbles inside the L-shaped structure with different orifices generate various streaming flows, thus allowing multiple degrees of freedom in locomotion. The streaming pattern and mean streaming speed depend on the intensity and frequency of the acoustic wave, which can trigger four dominant locomotion modes in the microrobot, denoted as translational and rotational, spinning, rotational, and translational modes. Next, the effect of various geometrical and actuation parameters on the control and navigation of the microrobot is investigated. Furthermore, the surface-slipping multimodal locomotion, flow mixing, particle manipulation capabilities, the effective interaction of high flow rates with cells, and subsequent cancerous cell lysing abilities of the proposed microrobot are demonstrated. Overall, these results introduce a design toolbox for the next generation of acoustic microrobots with higher degrees of freedom with multimodal locomotion in biomedical applications.
Collapse
Affiliation(s)
- Nima Mahkam
- Physical Intelligence DepartmentMax Planck Institute for Intelligent Systems70569StuttgartGermany
- Institute for Biomedical EngineeringETH ZurichZurich8092Switzerland
| | - Amirreza Aghakhani
- Physical Intelligence DepartmentMax Planck Institute for Intelligent Systems70569StuttgartGermany
- Institute of Biomaterials and Biomolecular SystemsUniversity of Stuttgart70569StuttgartGermany
| | - Devin Sheehan
- Physical Intelligence DepartmentMax Planck Institute for Intelligent Systems70569StuttgartGermany
| | - Gaurav Gardi
- Physical Intelligence DepartmentMax Planck Institute for Intelligent Systems70569StuttgartGermany
| | - Robert Katzschmann
- Department of Mechanical and Process EngineeringETH ZurichZurich8092Switzerland
| | - Metin Sitti
- Physical Intelligence DepartmentMax Planck Institute for Intelligent Systems70569StuttgartGermany
- Institute for Biomedical EngineeringETH ZurichZurich8092Switzerland
- School of MedicineKoç UniversityIstanbul34450Turkey
- College of EngineeringKoç UniversityIstanbul34450Turkey
| |
Collapse
|
15
|
Sun M, Yang S, Jiang J, Jiang S, Sitti M, Zhang L. Bioinspired self-assembled colloidal collectives drifting in three dimensions underwater. SCIENCE ADVANCES 2023; 9:eadj4201. [PMID: 37948530 PMCID: PMC10637755 DOI: 10.1126/sciadv.adj4201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 10/10/2023] [Indexed: 11/12/2023]
Abstract
Active matter systems feature a series of unique behaviors, including the emergence of collective self-assembly structures and collective migration. However, realizing collective entities formed by synthetic active matter in spaces without wall-bounded support makes it challenging to perform three-dimensional (3D) locomotion without dispersion. Inspired by the migration mechanism of plankton, we propose a bimodal actuation strategy in the artificial colloidal systems, i.e., combining magnetic and optical fields. The magnetic field triggers the self-assembly of magnetic colloidal particles to form a colloidal collective, maintaining numerous colloids as a dynamically stable entity. The optical field allows the colloidal collectives to generate convective flow through the photothermal effect, enabling them to use fluidic currents for 3D drifting. The collectives can perform 3D locomotion underwater, transit between the water-air interface, and have a controlled motion on the water surface. Our study provides insights into designing smart devices and materials, offering strategies for developing synthetic active matter capable of controllable collective movement in 3D space.
Collapse
Affiliation(s)
- Mengmeng Sun
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
- Physical Intelligence Department, Max Planck Institute for Instelligent Systems, Heisenbergstr. 3, Stuttgart 70569, Germany
| | - Shihao Yang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Jialin Jiang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Shuai Jiang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Instelligent Systems, Heisenbergstr. 3, Stuttgart 70569, Germany
| | - Li Zhang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
- Chow Yuk Ho Technology Center for Innovative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- Multi-Scale Medical Robotics Center, Hong Kong Science Park, Shatin NT, Hong Kong SAR, China
- Department of Surgery, The Chinese University of Hong Kong, Hong Kong SAR, China
- CUHK T Stone Robotics Institute, The Chinese University of Hong Kong, Hong Kong SAR, China
| |
Collapse
|
16
|
Bozuyuk U, Yildiz E, Han M, Demir SO, Sitti M. Size-Dependent Locomotion Ability of Surface Microrollers on Physiologically Relevant Microtopographical Surfaces. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303396. [PMID: 37488686 DOI: 10.1002/smll.202303396] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 07/10/2023] [Indexed: 07/26/2023]
Abstract
Controlled microrobotic navigation inside the body possesses significant potential for various biomedical engineering applications. Successful application requires considering imaging, control, and biocompatibility. Interaction with biological environments is also a crucial factor in ensuring safe application, but can also pose counterintuitive hydrodynamic barriers, limiting the use of microrobots. Surface rolling microrobots or surface microrollers is a robust microrobotic platform with significant potential for various applications; however, conventional spherical microrollers have limited locomotion ability over biological surfaces due to microtopography effects resulting from cell microtopography in the size range of 2-5 µm. Here, the impact of the microtopography effect on spherical microrollers of different sizes (5, 10, 25, and 50 µm) is investigated using computational fluid dynamics simulations and experiments. Simulations revealed that the microtopography effect becomes insignificant for increasing microroller sizes, such as 50 µm. Moreover, it is demonstrated that 50 µm microrollers exhibited smooth locomotion ability on in vitro cell layers and inside blood vessels of a chicken embryo model. These findings offer rational design principles for surface microrollers for their potential practical biomedical applications.
Collapse
Affiliation(s)
- Ugur Bozuyuk
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute for Biomedical Engineering, ETH Zurich, Zurich, 8092, Switzerland
| | - Erdost Yildiz
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Mertcan Han
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute for Biomedical Engineering, ETH Zurich, Zurich, 8092, Switzerland
| | - Sinan Ozgun Demir
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
- Institute for Biomedical Engineering, ETH Zurich, Zurich, 8092, Switzerland
- School of Medicine and School of Engineering, Koç University, Istanbul, 34450, Turkey
| |
Collapse
|
17
|
Deng Y, Paskert A, Zhang Z, Wittkowski R, Ahmed D. An acoustically controlled helical microrobot. SCIENCE ADVANCES 2023; 9:eadh5260. [PMID: 37729400 PMCID: PMC10511192 DOI: 10.1126/sciadv.adh5260] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 08/21/2023] [Indexed: 09/22/2023]
Abstract
As a next-generation toolkit, microrobots can transform a wide range of fields, including micromanufacturing, electronics, microfluidics, tissue engineering, and medicine. While still in their infancy, acoustically actuated microrobots are becoming increasingly attractive. However, the interaction of acoustics with microstructure geometry is poorly understood, and its study is necessary for developing next-generation acoustically powered microrobots. We present an acoustically driven helical microrobot with a length of 350 μm and a diameter of 100 μm that is capable of locomotion using a fin-like double-helix microstructure. This microrobot responds to sound stimuli at ~12 to 19 kHz and mimics the spiral motion of natural microswimmers such as spirochetes. The asymmetric double helix interacts with the incident acoustic field, inducing a propulsion torque that causes the microrobot to rotate around its long axis. Moreover, our microrobot has the unique feature of its directionality being switchable by simply tuning the acoustic frequency. We demonstrate this locomotion in 2D and 3D artificial vasculatures using a single sound source.
Collapse
Affiliation(s)
- Yong Deng
- Acoustic Robotics Systems Lab (ARSL), Institute of Robotics and Intelligent Systems, ETH Zurich, Rüschlikon CH-8803, Switzerland
| | - Adrian Paskert
- Institut für Theoretische Physik, Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
| | - Zhiyuan Zhang
- Acoustic Robotics Systems Lab (ARSL), Institute of Robotics and Intelligent Systems, ETH Zurich, Rüschlikon CH-8803, Switzerland
| | - Raphael Wittkowski
- Institut für Theoretische Physik, Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
| | - Daniel Ahmed
- Acoustic Robotics Systems Lab (ARSL), Institute of Robotics and Intelligent Systems, ETH Zurich, Rüschlikon CH-8803, Switzerland
| |
Collapse
|