期刊
ACS NANO
卷 12, 期 7, 页码 7282-7291出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b03494
关键词
self-propulsion; active colloids; Janus particles; micromotors; directional control
类别
资金
- European Research Council under the European Union's Seventh Framework Program (FP7/2007-2013)/ERC Grant [311529]
- Spanish Ministry of Economy, Industry, and Competitiveness [CTQ2015-68879-R]
- Ministry of Economy and Knowledge of the Government of Catalonia
- Marie Curie Actions of the 7th R&D Framework Program of the European Union (BP-DGR 2013)
- Commission for Universities and Research of the Department of Innovation, Universities, and Enterprise of the Generalitat de Catalunya [2014 SGR 1442]
- NANOVAX Euronanomed II project - Spanish Ministry of Economy and Competitiveness [APCIN-2016-025]
- CERCA program from Generalitat de Catalunya
- VI National R&D&i Plan 2008-2011
- Iniciativa Ingenio 2010
- GIBER Actions
- Instituto de Salud Carlos III
- European Regional Development
To achieve control over naturally diffusive, out-of-equilibrium systems composed of self-propelled particles, such as cells or self-phoretic colloids, is a long-standing challenge in active matter physics. The inherently random motion of these active particles can be rectified in the presence of local and periodic asymmetric cues given that a nontrivial interaction exists between the self-propelled particle and the cues. Here, we exploit the phoretic and hydrodynamic interactions of synthetic micromotors with local topographical features to break the time-reversal symmetry of particle trajectories and to direct a macroscopic flow of micromotors. We show that the orientational alignment induced on the micromotors by the topographical features, together with their geometrical asymmetry, is crucial in generating directional particle flow. We also show that our system can be used to concentrate micromotors in confined spaces and identify the interactions leading to this effect. Finally, we develop a minimal model, which identifies the key parameters of the system responsible for the observed rectification. Overall, our system allows for robust control over both temporal and spatial distribution of synthetic micromotors.
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