126 citations · 1.1k across the 45 of their papers we have counts for
48 papers
Molecular Dynamics Simulations of Microscopic Structural Transition and Macroscopic Mechanical Properties of Magnetic Gels
Xuefeng Wei, Gaspard Junot, Ramin Golestanian +4
Magnetic gels with embedded micro/nano-sized magnetic particles in crosslinked polymer networks can be actuated by external magnetic fields, with changes in their internal microsco…
Large scale zigzag pattern emerging from circulating active shakers
Gaspard Junot, Marco De Corato, Pietro Tierno
We report the emergence of large zigzag bands in a population of reversibly actuated magnetic rotors that behave as active shakers, namely squirmers that shake the fluid around the…
Excluded Volume Induces Buckling in Optically Driven Colloidal Rings
Eric Cereceda-Lóopez, Mattia Ostinato, Antonio Ortiz-Ambriz +3
In our combined experimental, theoretical and numerical work, we study the out of equilibrium deformations in a shrinking ring of optically trapped, interacting colloidal particles…
Ice Rule Breakdown and frustrated antiferrotoroidicity in an artificial colloidal Cairo ice
Carolina Rodríguez-Gallo, Antonio Ortiz-Ambriz, Cristiano Nisoli +1
We combine experiments and numerical simulations to investigate the low energy states and the emergence of topological defects in an artificial colloidal ice in the Cairo geometry.…
Hydrodynamic interactions hinder transport of flow-driven colloidal particles
Dominik Lips, Eric Cereceda-López, Antonio Ortiz-Ambriz +3
The flow-driven transport of interacting micron-sized particles occurs in many soft matter systems spanning from the translocation of proteins to moving emulsions in microfluidic d…
Hydrodynamic interactions can induce jamming in flow-driven systems
Eric Cereceda-López, Dominik Lips, Antonio Ortiz-Ambriz +3
Hydrodynamic interactions between fluid-dispersed particles are ubiquitous in soft matter and biological systems and they give rise to intriguing collective phenomena. While it was…
Collective hydrodynamic transport of magnetic microrollers
Gaspard Junot, Andrejs Cebers, Pietro Tierno
We investigate the collective transport properties of microscopic magnetic rollers that propel close to a surface due to a circularly polarized, rotating magnetic field. The applie…
Single-file dynamics of colloids in circular channels: time scales, scaling laws and their universality
Alejandro Villada-Balbuena, Antonio Ortiz-Ambriz, Pavel Castro-Villarreal +3
In colloidal systems, Brownian motion emerges from the massive separation of time and length scales associated to characteristic dynamics of the solute and solvent constituents. Th…
Topological Boundary Constraints in Artificial Colloidal Ice
Carolina Rodríguez-Gallo, Antonio Ortiz-Ambriz, Pietro Tierno
The effect of boundaries and how these can be used to influence the bulk behaviour in geometrically frustrated systems are both long-standing puzzles, often relegated to secondary…
Dynamical modes of sheared confined microscale matter
Sascha Gerloff, Antonio Ortiz-Ambriz, Pietro Tierno +1
Based on (overdamped) Stokesian dynamics simulations and video microscopy experiments, we study the non equilibrium dynamics of a sheared colloidal cluster, which is confined to a…
Dynamics and Clogging of colloidal monolayers magnetically driven through an heterogeneous landscape
Sergi Granados Leyva, Ralph Lukas Stoop, Pietro Tierno +1
We combine experiments and numerical simulations to investigate the emergence of clogging in a system of interacting paramagnetic colloidal particles driven against a disordered la…
Propulsion and energetics of a minimal magnetic microswimmer
Carles Calero, José García-Torres, Antonio Ortiz-Ambriz +3
In this manuscript we describe the realization of a minimal hybrid microswimmer, composed of a ferromagnetic nanorod and a paramagnetic microsphere. The unbounded pair is propelled…
Topology Restricts Quasidegeneracy in Sheared Square Colloidal Ice
Erdal C. Oğuz, Antonio Ortiz-Ambriz, Hadas Shem-Tov +3
Recovery of ground-state degeneracy in two-dimensional square ice is a significant challenge in the field of geometric frustration with far-reaching fundamental implications, such…
Collective Directional Locking of Colloidal Monolayers on a Periodic Substrate
Ralph L. Stoop, Arthur V. Straube, Tom H Johansen +1
We investigate the directional locking effects that arise when a monolayer of paramagnetic colloidal particles is driven across a triangular lattice of magnetic bubbles. We use an…
Emergent colloidal edge currents generated via exchange dynamics in a broken dimer state
Helena Massana-Cid, Antonio Ortiz-Ambriz, Andrej Vilfan +1
Controlling the flow of matter down to micrometer-scale confinement is of central importance in materials and environmental sciences, with direct applications in nano-microfluidics…
Direct Measurement of Lighthill's Energetic Efficiency of a Minimal Magnetic Microswimmer
Carles Calero, José García-Torres, Antonio Ortiz-Ambriz +3
The realization of artificial microscopic swimmers able to propel in viscous fluids is an emergent research field of fundamental interest and vast technological applications. For c…
Ice Rule and Emergent Frustration in Particle Ice and Beyond
Antonio Ortiz-Ambriz, Cristiano Nisoli, Charles Reichhardt +2
Geometric frustration and the ice rule are two concepts that are intimately connected and widespread across condensed matter. The first refers to the inability of a system to satis…
Magnetic assembly and annealing of colloidal lattices and superlattices
Pietro Tierno
The ability to assemble mesoscopic colloidal lattices above a surface is important for fundamental studies related with nucleation and crystallization, but also for a variety of te…
A Tuneable Magnetic Domain Wall Conduit Regulating Nanoparticle Diffusion
Pietro Tierno, Tom H. Johansen, Jose M. Sancho
We demonstrate a general and robust method to confine on a plane strongly diffusing submicrometer particles in water by using size tunable magnetic channels. These virtual conduits…
Competing orders for the colloidal kagome ice: the importance of in-trap motion of the particles
Anne Le Cunuder, Irénée Frérot, Antonio Ortiz-Ambriz +1
Artificial ice systems have been designed to replicate paradigmatic phenomena observed in frustrated spin systems. Here we present a detailed theoretical analysis based on Monte-Ca…
Enhancing nanoparticle diffusion on a unidirectional domain wall magnetic ratchet
Ralph L. Stoop, Arthur V. Straube, Pietro Tierno
The performance of nanoscale magnetic devices is often limited by the presence of thermal fluctuations, while in micro-nanofluidic applications the same fluctuations may be used to…
Ice Rule Fragility via Topological Charge Transfer in Artificial Colloidal Ice
Andras Libal, Don Yun Lee, Antonio Ortiz-Ambriz +4
Artificial particle ices are model systems of constrained, interacting particles. They have been introduced theoretically to study ice-manifolds emergent from frustration, along wi…
Coexistence of nonequilibrium phases in assemblies of driven nematic colloids
Josep M. Pagès, Arthur V. Straube, Pietro Tierno +2
We combine experiments, theory, and simulations to investigate the coexistence of nonequilibrium phases emerging from interacting colloidal particles that are electrokinetically pr…
Clogging and Jamming of Colloidal Monolayers Driven Across a Disordered Landscape
Ralph L. Stoop, Pietro Tierno
We experimentally investigate the clogging and jamming of interacting paramagnetic colloids driven through a quenched disordered landscape of fixed obstacles. When the particles ar…