179 citations · 879 across the 35 of their papers we have counts for
37 papers
Tunable mesoscopic numerical model for bacterial biofilms
J. Martin-Roca, B. Wu-Zhang, J. Oller +2
We present a tunable mesoscale model to provide a basis for future rheological calculations of of bacterial biofilms, explicitly incorporating reversible crosslinking within the ex…
Shear and bulk viscosities of water up to 1.6 GPa and anomaly in the structural relaxation time
Jan Eichler, Johannes Stefanski, José Martin Roca +4
Deep in the Earth's crust, pressure exceeds one thousand times the atmospheric pressure. Water still flows under these conditions, but experiences dramatic changes in structure and…
How Phase Coexistence affects the mechanical properties of heterogeneous 2D suspensions
Raul Molina-Prados Lallena, Jose Martin-Roca, Kristian Thijssen +3
Although numerical simulations of rheological measurements typically focus on homogeneous systems, heterogeneity can profoundly impact material properties. We report on the rheolog…
Phase fluctuations in a confined fluid
Frédéric Caupin, Alberto Zaragoza, Miguel A. Gonzalez +1
Fluid phase equilibrium depends on the external constraints imposed on a system. In a closed system with fixed volume, depending on the average density, a vapor bubble may be stabl…
Effective interactions in active Brownian particles
Clare R. Rees-Zimmerman, C. Miguel Barriuso Gutierrez, Chantal Valeriani +1
We report an approach to obtain effective pair potentials which describe the structure of two-dimensional systems of active Brownian particles. The pair potential is found by an in…
Phase behaviour and dynamical features of a two-dimensional binary mixture of active/passive spherical particles
Diego Rogel Rodriguez, Francisco Alarcon, Raul Martinez +2
In this work we have characterized the phase behaviour and the dynamics of bidimensional mixtures of active and passive Brownian particles. We have evaluated state diagrams at seve…
Confinement-induced collective motion in suspensions of run-and-tumble particles
José Martín-Roca, Daniel Escobar Ortiz, Chantal Valeriani +1
Collective motion is ubiquitous in active systems at all length and time scales. The mechanisms behind such collective motion usually are alignment interactions between active part…
Sorting of binary active-passive mixtures in designed microchannels
Horacio Serna, C. Miguel Barriuso G., Ignacio Pagonabarraga +2
Mixtures of active and passive particles are ubiquitous at the microscale. Many essential microbial processes involve interactions with dead or immotile cells or passive crowders.…
Dynamics and rupture of doped Motility Induced Phase Peparation
Rodrigo Fernández-Quevedo García, Enrique Chacón, Pedro Tarazona +1
Adding a small amount of passive (Brownian) particles to a two-dimensional dense suspension of repulsive active Brownian particles does not affect the appearance of a motility-indu…
Numerical methods for unraveling inter-particle potentials in colloidal suspensions: A comparative study for two-dimensional suspensions
Clare R. Rees-Zimmerman, José Martín-Roca, David Evans +3
We compare three model-free numerical methods for inverting structural data to obtain interaction potentials, namely iterative Boltzmann inversion (IBI), test-particle insertion (T…
Sedimentation and structure of squirmer suspensions under gravity
C. Miguel Barriuso G., Horacio Serna, Ignacio Pagonabarraga +1
The effect of gravity on the collective motion of living microswimmers, such as bacteria and micro-algae, is pivotal to unravel not only bio-convection patterns but also the settli…
Re-entrant percolation in active Brownian hard disks
David Evans, José Martín-Roca, Nathan J. Harmer +2
Non-equilibrium clustering and percolation are investigated in an archetypal model of two-dimensional active matter using dynamic simulations of self-propelled Brownian repulsive p…
Collective motion of energy depot active disks
Juan Pablo Miranda, Demian Levis, Chantal Valeriani
In the present work we have studied collectives of active disks with an energy depot, moving in the two-dimensional plane and interacting via excluded volume. The energy depot acco…
Rheology of Pseudomonas fluorescens biofilms: from experiments to predictive DPD mesoscopic modelling
Jose Mart. n-Roca, Valentino Bianco, Francisco Alarcon +6
Bacterial biofilms mechanically behave as viscoelastic media consisting of micron-sized bacteria crosslinked to a selfproduced network of extracellular polymeric substances (EPS) e…
Minimal numerical ingredients describe chemical microswimmers's 3D motion
Maximilian R. Bailey, C. Miguel Barriuso Gutiérrez, José Martín-Roca +6
The underlying mechanisms and physics of catalytic Janus microswimmers is highly complex, requiring details of the associated phoretic fields and the physiochemical properties of c…
Colloidal Hard Spheres: Triumphs, Challenges and Mysteries
C. Patrick Royall, Patrick Charbonneau, Marjolein Dijkstra +4
The simplicity of hard spheres as a model system is deceptive. Although the particles interact solely through volume exclusion, that nevertheless suffices for a wealth of static an…
Rheology of Pseudomonas fluorescens biofilms: from experiments to DPD mesoscopic modelling
Jose Martin Roca, Valentino Bianco, Francisco Alarcon +6
The presence of bacterial biofilms in clinical and industrial settings is a major issue worldwide. A biofilm is a viscoelastic matrix, composed of bacteria producing a network of E…
Simulating active agents under confinement with Dissipative Particles (hydro)Dynamics
C. Miguel Barriuso G., Jose Martin-Roca, Valentino Bianco +2
We study active agents embedded in bulk or in confinement explicitly considering hydrodynamics and simulating the swimmers via an implementation inspired by the squirmer model. We…
Dynamical anomalies and structural features of Active Brownian Particles characterised by two repulsive length scales
Jose Martin-Roca, Raul Martinez, Fernando Martinez-Pedrero +2
In this work we study a two-dimensional system composed by Active Brownian Particles (ABPs) interacting via a repulsive potential with two-length-scales, a soft shell and a hard-co…
Discovering dynamic laws from observations: the case of self-propelled, interacting colloids
Miguel Ruiz-Garcia, C. Miguel Barriuso G., Lachlan C. Alexander +3
Active matter spans a wide range of time and length scales, from groups of cells and synthetic self-propelled particles to schools of fish, flocks of birds, or even human crowds. T…
Rotating Micro-Spheres for Adsorption Monitoring at a Fluid Interface
J. Martín-Roca, M. Jiménez, F. Ortega +4
Hypothesis: A broad range of phenomena, such as emulsification and emulsion stability, foam formation or liquid evaporation, are closely related to the dynamics of adsorbing colloi…
Intrinsic structure perspective for MIPS interfaces in two dimensional systems of Active Brownian Particles
Enrique Chacon, Francisco Alarcon, Jorge Ramirez +2
Suspensions of Active Brownian Particles (ABP) undergo motility induced phase separation (MIPS) over a wide range of mean density and activity strength [1], even in the absence of…
In-silico modeling of early-stage biofilm formation
Pin Nie, Francisco Alarcon Oseguera, Ivan Lopez-Montero +3
Several bacteria and bacteria strands form biofilms in different environmental conditions, e.g. pH, temperature, nutrients, etc. Biofilm growth, therefore, is an extremely robust p…
Self-adaptation of Pseudomonas fluorescens biofilms to hydrodynamic stress
Josue J. Perez, Francisco Alarcon Oseguera, Ajay K. Monnappa +9
In some conditions, bacteria self-organise into biofilms, supracellular structures made of a self-produced embedding matrix, mainly composed on polysaccharides, DNA, proteins and l…