Shape-Directed Microspinners Powered by Ultrasound
- Syeda SabrinaSyeda SabrinaDepartment of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United StatesMore by Syeda Sabrina,
- Mykola TasinkevychMykola TasinkevychDepartment of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United StatesCentro de Fisica Teórica e Computacional, Departamento de Fisica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande P-1749-016 Lisboa, PortugalMore by Mykola Tasinkevych,
- Suzanne AhmedSuzanne AhmedDepartment of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United StatesMore by Suzanne Ahmed,
- Allan M. BrooksAllan M. BrooksDepartment of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United StatesMore by Allan M. Brooks,
- Monica Olvera de la CruzMonica Olvera de la CruzDepartment of Chemistry, Northwestern University, Evanston, Illinois 60208, United StatesMore by Monica Olvera de la Cruz,
- Thomas E. MalloukThomas E. MalloukDepartment of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United StatesMore by Thomas E. Mallouk, and
- Kyle J. M. Bishop*Kyle J. M. Bishop*E-mail: [email protected]Department of Chemical Engineering, Columbia University, New York, New York 10027, United StatesMore by Kyle J. M. Bishop
Abstract

The propulsion of micro- and nanoparticles using ultrasound is an attractive strategy for the remote manipulation of colloidal matter using biocompatible energy inputs. However, the physical mechanisms underlying acoustic propulsion are poorly understood, and our ability to transduce acoustic energy into different types of particle motions remains limited. Here, we show that the three-dimensional shape of a colloidal particle can be rationally engineered to direct desired particle motions powered by ultrasound. We investigate the dynamics of gold microplates with twisted star shape (Cnh symmetry) moving within the nodal plane of a uniform acoustic field at megahertz frequencies. By systematically perturbing the parametric shape of these “spinners”, we quantify the relationship between the particle shape and its rotational motion. The experimental observations are reproduced and explained by hydrodynamic simulations that describe the steady streaming flows and particle motions induced by ultrasonic actuation. Our results suggest how particle shape can be used to design colloids capable of increasingly complex motions powered by ultrasound.
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