Marisol Ripoll
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View article: Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids
Obstacle-tuned transition from chaotic to coherent vortex flows and odd diffusion in chiral active fluids Open
The interaction of a suspension of rotating colloids with a periodically patterned structure is here investigated by means of continuum theoretical predictions and hydrodynamic simulations. Close to the obstacle surface, rotors circulate o…
View article: Directed swarm assembly due to mixed misaligned perception-dependent motility
Directed swarm assembly due to mixed misaligned perception-dependent motility Open
Biological entities as diverse as birds or bacteria frequently self-assemble to display sophisticated collective dynamical behaviors. To understand and design interactions between the individual entities that originate the different flocki…
View article: Computational study of active polar polymer melts: from active reptation to activity induced local alignment
Computational study of active polar polymer melts: from active reptation to activity induced local alignment Open
This work investigates the effects of tangent polar activity on the conformational and dynamic properties of entangled polymer melts through Langevin molecular dynamics simulations. We examine systems composed of all self-propelled, monodi…
View article: Chiral active systems near a substrate: Emergent damping length controlled by fluid friction
Chiral active systems near a substrate: Emergent damping length controlled by fluid friction Open
Chiral active fluids show the emergence of a turbulent behaviour characterised by multiple dynamic vortices whose maximum size varies for each experimental system, depending on conditions not yet identified. We propose and develop an appro…
View article: Directed Swarm Assembly due to Mixed Misaligned Perception-Dependent Motility
Directed Swarm Assembly due to Mixed Misaligned Perception-Dependent Motility Open
A mixture of particles with perception-dependent motility and opposite misaligned visual perception shows to spontaneously self-organize into a self-propelling bean-shaped cluster. The two species initially rotate in opposite directions, w…
View article: Chiral active systems near a substrate: Emergent damping length controlled by fluid friction
Chiral active systems near a substrate: Emergent damping length controlled by fluid friction Open
Chiral active fluids show the emergence of a turbulent behavior characterized by multiple dynamic vortices whose maximum size is specific for each experimental system. This is in contrast to hydrodynamic simulations in which the size of vo…
View article: Progressive polymer deformation induced by polar activity and the influence of inertia
Progressive polymer deformation induced by polar activity and the influence of inertia Open
Polar activity is shown here to induce a progressive local deformation of linear polymer chains, making a clear distinction between head and tail, while the overall chain conformation gets more compact. This breakdown of self-similarity, p…
View article: Swirling Due to Misaligned Perception-Dependent Motility
Swirling Due to Misaligned Perception-Dependent Motility Open
A system of particles with motility variable in terms of a vision-type of perception is investigated by a combination of Langevin dynamics simulations in two-dimensional systems and an analytical approach based on conservation law principl…
View article: Diffusiophoretic Brownian dynamics: characterization of hydrodynamic effects for an active chemoattractive polymer
Diffusiophoretic Brownian dynamics: characterization of hydrodynamic effects for an active chemoattractive polymer Open
The phoretic Brownian dynamics method is shown here to be an effective approach to simulate the properties of colloidal chemophoretic based systems. The method is then optimized to allow for the comparison with results from multiparticle c…
View article: Progressive polymer deformation induced by polar activity and the influence of inertia
Progressive polymer deformation induced by polar activity and the influence of inertia Open
Polar activity is shown here to induce a progressive local deformation of linear polymer chains, making a clear distinction between head and tail, while the overall chain conformation gets more compact. This breakdown of self-similarity, p…
View article: Simultaneous emergence of active turbulence and odd viscosity in a colloidal chiral active system
Simultaneous emergence of active turbulence and odd viscosity in a colloidal chiral active system Open
Active fluids display collective phenomena such as active turbulence or odd viscosity, which refer to spontaneous complex and transverse flow. The simultaneous emergence of these seemingly separate phenomena is here reported in experiment …
View article: Birotor hydrodynamic microswimmers: From single to collective behaviour(a)
Birotor hydrodynamic microswimmers: From single to collective behaviour(a) Open
A microswimmer composed of two oppositely rotating strongly coupled colloids in solution is here termed as birotor and investigated by means of hydrodynamic simulations. The related flow fields, swimmer velocities, and rotational diffusion…
View article: Simultaneous emergence of active turbulence and odd viscosity in a colloidal chiral active system
Simultaneous emergence of active turbulence and odd viscosity in a colloidal chiral active system Open
The simultaneous emergence of active turbulence and odd viscosity for a colloidal rotors system is here shown. Rod-like colloidal particles with a ferromagnetic head and magnetic moment perpendicular to the rod axis, precess vertically to …
View article: Self-phoretic Brownian dynamics simulations
Self-phoretic Brownian dynamics simulations Open
A realistic and effective model to simulate phoretic Brownian dynamics swimmers based on the general form of the thermophoretic force is here presented. The collective behavior of self-phoretic dimers is investigated with this model and co…
View article: Clustering of self-thermophilic asymmetric dimers: the relevance of hydrodynamics
Clustering of self-thermophilic asymmetric dimers: the relevance of hydrodynamics Open
The presence of hydrodynamic interactions significantly influences the crystalline-like aggregates formed by thermophilic active colloids.
View article: Filamentous active matter: Band formation, bending, buckling, and defects
Filamentous active matter: Band formation, bending, buckling, and defects Open
Molecular motors connecting cytoskeletal filaments induce persistent motion of polar domains and formation of topological defects.
View article: The 2020 motile active matter roadmap
The 2020 motile active matter roadmap Open
Activity and autonomous motion are fundamental in living and engineering systems. This has stimulated the new field of ‘active matter’ in recent years, which focuses on the physical aspects of propulsion mechanisms, and on motility-induced…
View article: Filamentous Active Matter: Band Formation, Bending, Buckling, and\n Defects
Filamentous Active Matter: Band Formation, Bending, Buckling, and\n Defects Open
Motor proteins drive persistent motion and self-organisation of cytoskeletal\nfilaments. However, state-of-the-art microscopy techniques and continuum\nmodelling approaches focus on large length and time scales. Here, we perform\ncomponent…
View article: Tumbling of Quantum Dots: Rheo-Optics
Tumbling of Quantum Dots: Rheo-Optics Open
Linear flow dichroism is shown to be a powerful tool to characterize the hydrodynamic dimensions of extremely small nonspherical colloids in solution. Dispersions of prolate and oblate quantum dots (QDs) are employed to investigate the val…
View article: Microfluidic pump driven by anisotropic thermophoresis.
Microfluidic pump driven by anisotropic thermophoresis. Open
Microchannels with boundary walls at different temperatures and in between tilted elongated pillars are here shown to effectively behave as microfluidic pumps. The driving force for this fluid motion arises from the anisotropic thermophore…
View article: Anisotropic thermophoresis
Anisotropic thermophoresis Open
The thermophoretic force on an elongated colloid oriented with the temperature gradient can be larger or smaller than when oriented perpendicular to it. This anisotropy can translate into a non-vanishing thermophoretic force in the directi…
View article: Chemically driven fluid transport in long microchannels
Chemically driven fluid transport in long microchannels Open
Chemical gradients maintained along surfaces can drive fluid flows by diffusio-osmosis, which become significant at micro- and nano-scales. Here, by means of mesoscopic simulations, we show that a concentration drop across microchannels wi…