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Martínez-Pedrero F, González-Banciella A, Camino A, Mateos-Maroto A, Ortega F, Rubio RG, Pagonabarraga I, Calero C. Static and Dynamic Self-Assembly of Pearl-Like-Chains of Magnetic Colloids Confined at Fluid Interfaces. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2101188. [PMID: 34018678 DOI: 10.1002/smll.202101188] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Magnetic colloids adsorbed at a fluid interface are unique model systems to understand self-assembly in confined environments, both in equilibrium and out of equilibrium, with important potential applications. In this work the pearl-chain-like self-assembled structures of superparamagnetic colloids confined to a fluid-fluid interface under static and time-dependent actuations are investigated. On the one hand, it is found that the structures generated by static fields transform as the tilt angle of the field with the interface is increased, from 2D crystals to separated pearl-chains in a process that occurs through a controllable and reversible zip-like thermally activated mechanism. On the other hand, the actuation with precessing fields about the axis perpendicular to the interface induces dynamic self-assembled structures with no counterpart in non-confined systems, generated by the interplay of averaged magnetic interactions, interfacial forces, and hydrodynamics. Finally, how these dynamic structures can be used as remotely activated roller conveyors, able to transport passive colloidal cargos at fluid interfaces and generate parallel viscous flows is shown. The latter can be used in the mixture of adsorbed molecules and the acceleration of surface-chemical reactions, overcoming diffusion limitations.
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Affiliation(s)
- Fernando Martínez-Pedrero
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
| | - Andrés González-Banciella
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
| | - Alba Camino
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
| | - Ana Mateos-Maroto
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
| | - Francisco Ortega
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
- Inst. Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan 23,1, Madrid 2, Madrid, 28040, Spain
| | - Ramón G Rubio
- Departamento de Química-Física, Universidad Complutense de Madrid, Avda. Complutense s/n, Madrid 1, Madrid, 28040, Spain
- Inst. Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan 23,1, Madrid 2, Madrid, 28040, Spain
| | - Ignacio Pagonabarraga
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, 08028, Spain
- Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, Barcelona, 08028, Spain
- CECAM, Ecole Polytechnique Federale de Lausanne, Batochime, Avenue Forel 2, Lausanne, 1015, Switzerland
| | - Carles Calero
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Barcelona, 08028, Spain
- Institut de Nanociència i Nanotecnologia, IN2UB, Universitat de Barcelona, Barcelona, 08028, Spain
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Casado-Pascual J, Sánchez-Rey B, Quintero NR. Soliton ratchet induced by random transitions among symmetric sine-Gordon potentials. CHAOS (WOODBURY, N.Y.) 2019; 29:053119. [PMID: 31154783 DOI: 10.1063/1.5092797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
The generation of net soliton motion induced by random transitions among N symmetric phase-shifted sine-Gordon potentials is investigated, in the absence of any external force and without any thermal noise. The phase shifts of the potentials and the damping coefficients depend on a stationary Markov process. Necessary conditions for the existence of transport are obtained by an exhaustive study of the symmetries of the stochastic system and of the soliton velocity. It is shown that transport is generated by unequal transfer rates among the phase-shifted potentials or by unequal friction coefficients or by a properly devised combination of potentials (N>2). Net motion and inversions of the currents, predicted by the symmetry analysis, are observed in simulations as well as in the solutions of a collective coordinate theory. A model with high efficient soliton motion is designed by using multistate phase-shifted potentials and by breaking the symmetries with unequal transfer rates.
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Affiliation(s)
- Jesús Casado-Pascual
- Física Teórica, Universidad de Sevilla, Apartado de Correos 1065, 41080 Sevilla, Spain
| | - Bernardo Sánchez-Rey
- Departamento de Física Aplicada I, E.P.S., Universidad de Sevilla, Virgen de África 7, 41011 Sevilla, Spain
| | - Niurka R Quintero
- Departamento de Física Aplicada I, E.P.S., Universidad de Sevilla, Virgen de África 7, 41011 Sevilla, Spain
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Sándor C, Libál A, Reichhardt C, Reichhardt CJO. Collective transport for active matter run-and-tumble disk systems on a traveling-wave substrate. Phys Rev E 2017; 95:012607. [PMID: 28208499 DOI: 10.1103/physreve.95.012607] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 06/06/2023]
Abstract
We examine numerically the transport of an assembly of active run-and-tumble disks interacting with a traveling-wave substrate. We show that as a function of substrate strength, wave speed, disk activity, and disk density, a variety of dynamical phases arise that are correlated with the structure and net flux of disks. We find that there is a sharp transition into a state in which the disks are only partially coupled to the substrate and form a phase-separated cluster state. This transition is associated with a drop in the net disk flux, and it can occur as a function of the substrate speed, maximum substrate force, disk run time, and disk density. Since variation of the disk activity parameters produces different disk drift rates for a fixed traveling-wave speed on the substrate, the system we consider could be used as an efficient method for active matter species separation. Within the cluster phase, we find that in some regimes the motion of the cluster center of mass is in the opposite direction to that of the traveling wave, while when the maximum substrate force is increased, the cluster drifts in the direction of the traveling wave. This suggests that swarming or clustering motion can serve as a method by which an active system can collectively move against an external drift.
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Affiliation(s)
- Cs Sándor
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Mathematics and Computer Science Department, Babeş-Bolyai University, Cluj 400084, Romania
| | - A Libál
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Mathematics and Computer Science Department, Babeş-Bolyai University, Cluj 400084, Romania
| | - C Reichhardt
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - C J Olson Reichhardt
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Tierno P, Straube AV. Transport and selective chaining of bidisperse particles in a travelling wave potential. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:54. [PMID: 27194527 DOI: 10.1140/epje/i2016-16054-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Revised: 04/08/2016] [Accepted: 04/13/2016] [Indexed: 06/05/2023]
Abstract
We combine experiments, theory and numerical simulation to investigate the dynamics of a binary suspension of paramagnetic colloidal particles dispersed in water and transported above a stripe-patterned magnetic garnet film. The substrate generates a one-dimensional periodic energy landscape above its surface. The application of an elliptically polarized rotating magnetic field causes the landscape to translate, inducing direct transport of paramagnetic particles placed above the film. The ellipticity of the applied field can be used to control and tune the interparticle interactions, from net repulsive to net attractive. When considering particles of two distinct sizes, we find that, depending on their elevation above the surface of the magnetic substrate, the particles feel effectively different potentials, resulting in different mobilities. We exploit this feature to induce selective chaining for certain values of the applied field parameters. In particular, when driving two types of particles, we force only one type to condense into travelling parallel chains. These chains confine the movement of the other non-chaining particles within narrow colloidal channels. This phenomenon is explained by considering the balance of pairwise magnetic forces between the particles and their individual coupling with the travelling landscape.
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Affiliation(s)
- Pietro Tierno
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia IN2UB, Universitat de Barcelona, Barcelona, Spain.
| | - Arthur V Straube
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Spain
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