Shape-driven optofluidic rotational actuation
Dip. SIMAU, Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy
2 Department of Crystals, Institute of Physics, National Academy of Science, Pr. Nauky 46, 03039, Kiev, Ukraine
3 Taras Shevchenko National University of Kyiv, 01601, Kiev, Ukraine
4 Istituto di Scienze Applicate e Sistemi Intelligenti, ISASI-CNR, 80078, Pozzuoli, Naples, Italy
5 CNR, Institute of Heritage Science, Via Madonna del Piano, 50019, Sesto Fiorentino, FI, Italy
6 URT-CNR, UNICAM, Via Sant’ Agostino, 62032, Camerino, MC, Italy
Accepted: 27 March 2021
Published online: 25 April 2021
In the present work, we report light-induced rotation of millimeter-sized objects driven by their non-symmetric shape. The light-induced torque is originated by the thermal gradient on different sides of the teeth of star-shaped objects floating on liquid surfaces that leads to unbalanced surface tension due to the Marangoni effect. The dependence of the angular rotation on the number of teeth is demonstrated. The angular velocity is linearly dependent on the light intensity and follows a simple time behavior typical of objects moving under fluid friction.
© The Author(s) 2021
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.