Affiliation:
1. Robotics Institute School of Mechanical Engineering and Automation Beihang University Beijing 100191 P. R. China
2. BIOS Lab‐on‐a‐chip University of Twente Enschede P.O. Box 217, 7500AE The Netherlands
3. Physics of Fluids Max Planck Center Twente for Complex Fluid Dynamics and J.M. Burgers Centre for Fluid Mechanics University of Twente Enschede P.O. Box 217, 7500AE The Netherlands
4. Ningbo Institute of Technology Beihang University Ningbo 315832 P. R. China
Abstract
AbstractMicrobubble generation and manipulation play critical roles in diverse applications such as microfluidic mixing, pumping, and microrobot propulsion. However, existing methods are typically limited to lateral movements on customized substrates or rely on specific liquids with particular properties or designed concentration gradients, thereby hindering their practical applications. To address this challenge, this paper presents a method that enables robust vertical manipulation of microbubbles. By focusing a resonant laser on hydrophilic silica‐coated gold nanoparticle arrays immersed in water, plasmonic microbubbles are generated and detach from the substrates immediately upon cessation of laser irradiation. Using simple laser pulse control, it can achieve an adjustable size and frequency of bubble bouncing, which is governed by the movement of the three‐phase contact line during surface wetting. Furthermore, it demonstrates that rising bubbles can be pulled back by laser irradiation induced thermal Marangoni flow, which is verified by particle image velocimetry measurements and numerical simulations. This study provides novel insights into flexible bubble manipulation and integration in microfluidics, with significant implications for various applications including mixing, drug delivery, and the development of soft actuators.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Fundamental Research Funds for the Central Universities
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
4 articles.
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