A Force to Be Reckoned With: A Review of Synthetic Microswimmers Powered by Ultrasound
作者:
K. Jagajjanani Rao,
Fei Li,
Long Meng,
Hairong Zheng,
Feiyan Cai,
Wei Wang,
期刊:
Small
(WILEY Available online 2015)
卷期:
Volume 11,
issue 24
页码: 2836-2846
ISSN:1613-6810
年代: 2015
DOI:10.1002/smll.201403621
关键词: microswimmers;ultrasound;autonomous motion;self‐propulsion;nanomotors
数据来源: WILEY
摘要:
Synthetic microswimmers are a class of artificial nano‐ or microscale particle capable of converting external energy into motion. They are similar to natural microswimmers such as bacteria in behavior and are, therefore, of great interest to the study of active matter. Additionally, microswimmers show promise in applications ranging from bioanalytics and environmental monitoring to particle separation and drug delivery. However, since their sizes are on the nano‐/microscale and their speeds are in the μm s−1range, they fall into a low Reynolds number regime where viscosity dominates. Therefore, new propulsion schemes are needed for these microswimmers to be able to efficiently move. Furthermore, many of the hotly pursued applications call for innovations in the next phase of development of biocompatible microswimmers. In this review, the latest developments of microswimmers powered by ultrasound are presented. Ultrasound, especially at MHz frequencies, does little harm to biological samples and provides an advantageous and well‐controlled means to efficiently power microswimmers. By critically reviewing the recent progress in this research field, an introduction of how ultrasound propels colloidal particles into autonomous motion is presented, as well as how this propulsion can be used to achieve preliminary but promising appl
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