Sun Jining, Zhang Zhiyuan, Feng Zhongyu, Wang Kunwen, Shi Zhenqiang, Zhang Lei
School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of High-performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China.
Langmuir. 2024 Dec 10;40(49):26203-26211. doi: 10.1021/acs.langmuir.4c03701. Epub 2024 Nov 27.
The generation of surface acoustic waves (SAW) through electrically driven piezoelectric devices has attracted considerable attention in both fundamental research and practical applications, particularly for suppressing bacterial adhesion on surfaces. However, the precise mechanism by which SAW prevents bacterial attachment remains incompletely understood. This study explores the impact of SAW-induced boundary-driven streaming on the surface adhesion of and in a liquid environment, focusing on the prevention of bacterial adhesion through the formation of micrometer-scale shielding fluid layers. We primarily examine the distance and acoustic streaming effects that influence bacterial behavior in the flow field. Our in vitro experiments, supported by numerical simulations, demonstrate that the viscous boundary layer and vortices generated by SAW can inhibit bacterial colonization and biofilm formation when Stokes drag forces predominate. This work provides new insights into the inhibitory mechanism of SAW on bacterial adhesion, offering valuable guidance for the development of advanced antibacterial strategies.
通过电驱动压电器件产生表面声波（SAW）在基础研究和实际应用中都引起了相当大的关注，特别是在抑制细菌在表面的粘附方面。然而，SAW防止细菌附着的确切机制仍未完全了解。本研究探讨了SAW诱导的边界驱动流对液体环境中细菌表面粘附的影响，重点关注通过形成微米级屏蔽流体层来防止细菌粘附。我们主要研究影响流场中细菌行为的距离和声流效应。我们的体外实验在数值模拟的支持下表明，当斯托克斯阻力占主导时，SAW产生的粘性边界层和涡旋可以抑制细菌定植和生物膜形成。这项工作为SAW对细菌粘附的抑制机制提供了新的见解，为先进抗菌策略的开发提供了有价值的指导。
