布朗运动
推进
物理
热泳
经典力学
粒子(生态学)
不对称
运动(物理)
职位(财务)
磁层粒子运动
圆周运动
噪音(视频)
纳米技术
机械
材料科学
计算机科学
量子力学
财务
经济
人工智能
地质学
图像(数学)
磁场
纳米流体
海洋学
热力学
传热
作者
Martin Fränzl,Santiago Muíños-Landín,Viktor Holubec,Frank Cichos
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-02-08
卷期号:15 (2): 3434-3440
被引量:29
标识
DOI:10.1021/acsnano.0c10598
摘要
A cornerstone of the directed motion of microscopic self-propelling particles is an asymmetric particle structure defining a polarity axis along which these tiny machines move. This structural asymmetry ties the orientational Brownian motion to the microswimmers directional motion, limiting their persistence and making the long time motion effectively diffusive. Here, we demonstrate a completely symmetric thermoplasmonic microswimmer, which is propelled by laser-induced self-thermophoresis. The propulsion direction is imprinted externally to the particle by the heating laser position. The orientational Brownian motion, thus, becomes irrelevant for the propulsion, allowing enhanced control over the particles dynamics with almost arbitrary steering capability. We characterize the particle motion in experiments and simulations and also theoretically. The analysis reveals additional noise appearing in these systems, which is conjectured to be relevant for biological systems. Our experimental results show that even very small particles can be precisely controlled, enabling more advanced applications of these micromachines.
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