Multiorifice acoustic microrobot for boundary- free multimodal 3D swimming

• 成果类型: Article
• 署名作者: Mahkam, Nima; Ugurlu, Musab C.; Kalva, Sandeep Kumar; Aghakhani, Amirreza; Razansky, Daniel; Sitti, Metin
• 署名单位: Max Planck Society; Swiss Federal Institutes of Technology Domain; ETH Zurich; University of Geneva; University of Zurich; University of Stuttgart; Koc University; Koc University; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Bombay
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-15075
• DOI: 10.1073/pnas.2417111122
• 发表日期: 2025-01-28
• 关键词: collective motion

摘要

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 mu m to 100 mu m, focusing on their boundary- free 3D swimming and multimodal locomotion in response to 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.