Latest in cond-mat.soft

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Interrupted Motility Induced Phase Separation in Aligning Active ColloidsFeb 21 2019Switching on high activity in a relatively dense system of active Janus colloids, we observe fast clustering, followed by cluster aggregation towards full phase separation. The phase separation process is however interrupted when large enough clusters ... More
A constitutive model for brittle granular materials considering the competition between breakage and dilationFeb 20 2019A constitutive model is presented for brittle granular materials based on a recent reformulation of the breakage mechanics theory. Compared with previous breakage mechanics-based models, the proposed model is improved to capture strain softening towards ... More
Competing Time Scales Lead to Oscillations in Shear-Thickening SuspensionsFeb 20 2019Competing time scales generate novelty. Here, we show that a coupling between the time scales imposed by instrument inertia and the formation of inter-particle frictional contacts in shear-thickening suspensions leads to highly asymmetric shear-rate oscillations. ... More
Local stress and pressure in an inhomogeneous system of spherical active Brownian particlesFeb 20 2019The stress of a fluid on a confining wall is given by the mechanical wall forces, independent of the nature of the fluid being passive or active. At thermal equilibrium, an equation of state exists and stress is likewise obtained from intrinsic bulk properties; ... More
Viscoelasticity and dynamical gaps: rigidity in crystallization and glass-forming liquidsFeb 19 2019Rigidity plays an important role on the relaxation properties of glass forming melts, yet it is usually determined from the average co-ordination number through the chemical composition. A discussion is presented on how viscoelasticity can be used as ... More
Comparison of the lateral retention forces on sessile, pendant, and inverted sessile dropsFeb 18 2019We compare the lateral retention forces on sessile drops (which are drops that are placed on top of a solid surface), pendant drops (which are drops that are placed on the underside of the surface), and inverted sessile drops (which are drops that are ... More
Adhesive contact of model randomly rough rubber surfacesFeb 18 2019We study experimentally and theoretically the equilibrium adhesive contact between a smooth glass lens and a rough rubber surface textured with spherical microasperities with controlled height and spatial distributions. Measurements of the real contact ... More
Actin filaments pushing against a barrier: Comparison between two force generation mechanismsFeb 18 2019To theoretically understand force generation properties of actin filaments, many models consider growing filaments pushing against a movable obstacle or barrier. In order to grow, the filaments need space and hence it is necessary to move the barrier. ... More
Phase Transitions in Nematics: Textures with Tactoids and DisclinationsFeb 17 2019We demonstrate that a first order isotropic-to-nematic phase transition in liquid crystals can be succesfully modeled within the generalized Landau-de Gennes theory by selecting an appropriate combination of elastic constants. The numerical simulations ... More
Constant spacing in filament bundlesFeb 17 2019Assemblies of filaments appear in a wide range of systems: from biopolymer bundles, columnar liquid crystals, and superconductor vortex arrays; to familiar macroscopic materials, like ropes, cables and textiles. Interactions between the constituent filaments ... More
Behavior of active filaments near solid-boundary under linear shear flowFeb 17 2019The steady-state behavior of a dilute suspension of self-propelled filament confined between planar walls subjected to the Couette-flow is reported herein. The effect of hydrodynamics has been taken into account using a mesoscale simulation approach. ... More
Osmosis, from molecular insights to large-scale applicationsFeb 17 2019Osmosis is a universal phenomenon occurring in a broad variety of processes and fields. It is the archetype of entropic forces, both trivial in its fundamental expression - the van 't Hoff perfect gas law - and highly subtle in its physical roots. While ... More
Statistical signature of vortex filaments in classic turbulence: dog or tail?Feb 17 2019The title of this paper echoes the title of a paragraph in the famous book by Frisch on classical turbulence. In the relevant chapter, the author discusses the role of the statistical dynamics of vortex filaments in the fascinating problem of turbulence ... More
Non-crossing run-and-tumble particles on a lineFeb 16 2019We study active particles performing run and tumble motion on the line with velocities $v_0 \sigma(t)$, where $\sigma(t) = \pm 1$ a dichotomous telegraphic noise with constant flipping rate $\gamma$. We first consider one particle in the presence of an ... More
Motility-induced temperature difference in coexisting phasesFeb 16 2019In nature, objects which are in thermal contact with each other, usually approach the same temperature, unless a heat source (or sink) cherishes a persistent flow of heat. Accordingly, in a well-isolated apartment flat, most items are at a similar temperature. ... More
Remark on Protein Collapse from a Random WalkFeb 15 2019We use a mean-field approximation to show the rapid collapse of protein-like polymers from random walk size to a much smaller, molten globule state due to hydrophobic interactions, to be followed by a slower annealing process in which there is little ... More
Tuning the permeability of dense membranes by shaping nanoscale potentialsFeb 15 2019The permeability is one of the most fundamental transport properties in soft matter physics, material engineering, and nanofluidics. Here we report by means of Langevin simulations of ideal penetrants in a nanoscale membrane made of a fixed lattice of ... More
The excluded area of two-dimensional hard particlesFeb 15 2019The excluded area between a pair of two-dimensional hard particles with given relative orientation is the region in which one particle cannot be located due to the presence of the other particle. The magnitude of the excluded area as a function of the ... More
Ion Condensation onto Ribozyme is Site-Specific and Fold-DependentFeb 15 2019The highly charged RNA molecules, with each phosphate carrying a single negative charge, cannot fold into well-defined architectures with tertiary interactions, in the absence of ions. For ribozymes, divalent cations are known to be more efficient than ... More
Thermodynamics of force-induced B-DNA melting: single-strand discreteness mattersFeb 15 2019Overstretching of B-DNA is currently understood as force-induced melting. Depending on the geometry of the stretching experiment, the force threshold for the overstretching transition is around 65 or 110 pN. Although the mechanisms behind force-induced ... More
Hydrodynamics and rheology of a vesicle doublet suspensionFeb 15 2019The dynamics of an adhesive vesicle doublet under various flow conditions is investigated numerically using a high-order, adaptive-in-time boundary integral method. In a quiescent flow, two nearby vesicles move slowly towards each other under the adhesive ... More
Seismic-like organization of avalanches in a driven long-range elastic string as a paradigm of brittle cracksFeb 15 2019Very often damage and fracture in heterogeneous materials exhibit bursty dynamics made of successive impulse-like events which form characteristic aftershock sequences obeying specific scaling laws initially derived in seismology: Gutenberg-Richter law, ... More
A New Twist on the Electroclinic Critical Point: Type I and Type II Smectic $C^*$ SystemsFeb 14 2019This analysis of the electroclinic effect in ferroelectric liquid crystals with a first order Smectic-$A^*$--Smectic-$C^*$ (Sm-$A^*$--Sm-$C^*$) transition, shows they can be either Type I or Type II. In temperature--field parameter space Type I systems ... More
One-Loop Fluctuation Entropy of Charge Inversion in DNAFeb 14 2019Experiments have revealed correlation-driven behavior of DNA in charged solutions, including charge inversion and condensation. This paper presents calculations of a lattice-gas model of charge inversion for the adsorption of charged dimers on DNA. Each ... More
Continuum theory of electrostatic correlations at charged surfacesFeb 14 2019The standard model for diffuse charge phenomena in colloid science, electrokinetics and biology is the Poisson-Boltzmann mean-field theory, which breaks down for multivalent ions and large surface charge densities due to electrostatic correlations. In ... More
Extreme active matter at high densitiesFeb 14 2019Extreme active matter, an assembly of self-propelled particles with large persistence time $\tau_p$ and high P\'eclet number, exhibits remarkable behaviour at high densities. As $\tau_p\to 0$, the assembly undergoes a gradual slowing down of density relaxations, ... More
Self-assembled multi-layer simple cubic photonic crystals of oppositely charged colloids in confinementFeb 14 2019Designing and fabricating self-assembled open colloidal crystals have become one major direction in soft matter community because of many promising applications associated with open colloidal crystals. However, most of the self-assembled crystals found ... More
Numerical Simulations of Vorticity Banding of Emulsions in Shear FlowsFeb 14 2019Multiphase shear flows often show banded structures that affect the global behavior of complex fluids e.g. in microdevices. Here we investigate numerically the banding of emulsions, i.e. the formation of regions of high and low volume fraction, alternated ... More
Enhanced velocity fluctuations in interacting swimmer suspensionsFeb 14 2019A dilute non-interacting suspension of micro-swimmers exhibits a finite velocity variance and short-ranged correlations that decay over a swimmer length. For a suspension of interacting straight swimmers, however, pair-interactions leads to a non-decaying ... More
Sharp-interface approach for simulating solid-state dewetting in three dimensionsFeb 14 2019The problem of simulating solid-state dewetting of thin films in three dimensions (3D) by using a sharp-interface approach is considered in this paper. Based on the thermodynamic variation, a speed method is used for calculating the first variation to ... More
Molecular dynamics simulations of active Brownian particles in dilute suspension: diffusion in free space and distribution in confinementFeb 14 2019In this work, we report a new method to simulate active Brownian particles (ABPs) in molecular dynamics (MD) simulations. Immersed in a fluid, each ABP consists of a head particle and a spherical phantom region of fluid where the flagellum of a microswimmer ... More
Local loop opening in untangled ring polymer melts: A detailed "Feynman test" of models for the large scale structureFeb 13 2019The conformational statistics of ring polymers in melts or dense solutions is strongly affected by their quenched microscopic topological state. The effect is particularly strong for untangled (i.e. non-concatenated and unknotted) rings, which are known ... More
Phase-transforming Helical Miura OrigamiFeb 13 2019We construct cylindrical helical Miura origami using a partially folded Miura parallelogram--a parallelogram that has a flat-foldable degree-four vertex--as the deformed unit cell. We show in a particular example that the structure is bistable, inherited ... More
Diffusion through nanopores in connected lipid bilayer networksFeb 13 2019A biomimetic model of cell-cell communication was developed to probe the passive molecular transport across ion channels inserted in synthetic lipid bilayers formed between contacting droplets arranged in a linear array. Diffusion of a fluorescent probe ... More
A stochastic approach to the filling dynamics of a porous medium: full/empty pores duality symmetry and the emergence of Darcy's lawFeb 13 2019A stochastic approach to the filling dynamics of an open topology porous structure permeated with a perfectly wetting fluid is presented. From the discrete structure of the disordered voids network with only nearest neighbors links, we derive the "microscopic" ... More
Modelling phase separation in amorphous solid dispersionsFeb 13 2019Much work has been devoted to analysing thermodynamic models for solid dispersions with a view to identifying regions in the phase diagram where amorphous phase separation or drug recrystallization can occur. However, detailed partial differential equation ... More
A stochastic model for bacteria-driven micro-swimmersFeb 13 2019Experiments have recently shown the feasibility of utilising bacteria as micro-scale robotic devices, with special attention paid to the development of bacteria-driven micro-swimmers taking advantage of built-in actuation and sensing mechanisms of cells. ... More
Two-dimensional pattern formation in ionic liquids confined between graphene wallsFeb 13 2019We perform molecular dynamics simulations of ionic liquids confined between graphene walls under a large variety of conditions (pure ionic liquids, mixtures with water and alcohols, mixtures with lithium salts and defective graphene walls). Our results ... More
Particle motion driven by non-uniform thermodynamic forcesFeb 13 2019We present a complete reciprocal description of particle motion inside multi-component fluids that extends the conventional Onsager formulation of non-equilibrium transport to systems where the thermodynamic forces are locally non-uniform on the colloidal ... More
Structure and dynamics of a self-propelled semiflexible filamentFeb 13 2019We investigate structural and dynamical properties of a self-propelled filament using coarse-grained Brownian dynamics simulations. A self-propulsion force is applied along the bond vectors, i.e., tangent to the filament and their locations are considered ... More
Dilatancy and compaction in a pressure control granular system under an oscillatory shearFeb 13 2019We numerically study the rheology of a frictional granular system confined by a constant pressure under an oscillatory shear. We find several scaling laws for the storage and the loss moduli against the scaled strain amplitude. These scaling laws can ... More
Defect removal by solvent vapor annealing in thin films of lamellar diblock copolymersFeb 13 2019Solvent vapor annealing (SVA) is known to be a simple, low-cost and highly efficient technique to produce defect-free diblock copolymer (BCP) thin films. Not only can the solvent dilute the BCP segmental interactions, but also it can vary the characteristic ... More
Nonsteady-state diffusion in two-dimensional periodic channelsFeb 12 2019The dynamics of a freely diffusing particle in a two-dimensional channel with cross sectional area $A(x)$, can be effectively described by a one-dimensional diffusion equation under the action of a potential of mean force $U(x)=-k_BT\ln [A(x)]$ (where ... More
Driven active matter: fluctuations and a hydrodynamic instabilityFeb 12 2019Wet active matter in the presence of an imposed temperature gradient, or chemical potential gradient, is considered. It is shown that there is a new type of convective instability that is caused by a (negative) activity parameter. Physically this corresponds ... More
Collective Motion in the Interfacial and Interior Regions of Supported Polymer Films and its Relation to RelaxationFeb 12 2019To understand the role of collective motion in the often large changes in interfacial molecular mobility observed in polymer films, we investigate the extent of collective motion in the interfacial regions of a thin supported polymer film and within the ... More
Osmotic pressure of compressed lattice knotsFeb 12 2019A numerical simulation shows that the osmotic pressure of compressed lattice knots is a function of knot type, and so of entanglements. The osmotic pressure for the unknot goes through a negative minimum at low concentrations, but in the case of non-trivial ... More
Osmotic pressure of compressed lattice knotsFeb 12 2019Feb 20 2019A numerical simulation shows that the osmotic pressure of compressed lattice knots is a function of knot type, and so of entanglements. The osmotic pressure for the unknot goes through a negative minimum at low concentrations, but in the case of non-trivial ... More
Multi-phase, non-isothermal transfer of water in a simple geometryFeb 12 2019It has long been acknowledged that heat and water transport of in soils and plants are intimately coupled. Pioneering work by Philip and de Vries proposed the physical basis and governing equations to describe these processes; their theory has since been ... More
Shear jamming and fragility in dense suspensionsFeb 12 2019The phenomenon of shear-induced jamming is a factor in the complex rheological behavior of dense suspensions. Such shear-jammed states are fragile, i.e., they are not stable against applied stresses that are incompatible with the stress imposed to create ... More
Two dimensional vortex structures with multi scale interactions in thin film superconductorsFeb 12 2019Interaction of particles of many systems can be effectively approximated by multiscale interaction potentials. Such potentials are widely used for investigation of colloidal systems and colloid-polymer mixtures, complex liquids (for instance, water) and ... More
Elasto-capillary adhesion: The effect of deformability on adhesion strength and detachmentFeb 12 2019We study the interaction between capillary forces and deformation in the context of a deformable capillary adhesive: a clamped, tense membrane is adhered to a rigid substrate by the surface tension of a liquid droplet. We find that the equilibrium adhesive ... More
Measuring Heat Flux Beyond Fourier's lawFeb 12 2019We use nonequilibrium molecular dynamics (NEMD) to explore the effect of shear flow on heat flux. By simulating a simple fluid in a channel bounded by tethered atoms, the heat flux is computed for two systems: a temperature driven one with no flow and ... More
O'Connor, Alvarez, and Robbins Reply to Xu et al. (arXiv:1808.05390)Feb 11 2019The preceding Comment by Xu et al. (Phys. Rev. Lett. 122, 059803 (2019); arXiv:1808.05390) erroneously applies the entropic stress expression in our Letter (T.C. O'Connor et al., Phys. Rev. Lett. 121, 047801 (2018); arXiv:1806.09509) to transient stress. ... More
Transient response of an electrolyte to a thermal quenchFeb 11 2019We study the transient response of an electrolytic cell subject to a small, suddenly-applied temperature increase at one of its two bounding electrode surfaces. An inhomogeneous temperature profile then develops, causing, via the Soret effect, ionic rearrangements ... More
A new look at effective interactions between microgel particlesFeb 11 2019Thermoresponsive microgels find widespread use as colloidal model systems, because their temperature-dependent size allows facile tuning of their volume fraction "in situ". However, an interaction potential unifying their behavior across the entire phase ... More
Elastic Alfven waves in elastic turbulenceFeb 11 2019Speed of sound waves in gases and liquids is governed by medium compressibility. There exists another type of non-dispersive waves which speed depends on stress instead of medium elasticity. A well-known example is the Alfven wave propagating, with a ... More
Electrical conductance of two-dimensional composites with embedded rodlike fillers: an analytical consideration and comparison of two computational approachesFeb 11 2019Using Monte Carlo simulation, we studied the electrical conductance of two-dimensional films. The films consisted of a poorly conductive host matrix and highly conductive rodlike fillers (rods). The rods were of various lengths, obeying a log-normal distribution. ... More
Solidification of the Lennard-Jones fluid near the wall in thermohydrodynamic lubricationFeb 11 2019We investigate the thermohydrodynamic lubrication of the Lennard-Jones (LJ) fluid in the parallel-plate channel composed of the LJ particles by using molecular dynamics (MD) simulation. We discover a counterintuitive solidification of the LJ fluid near ... More
Stokesian dynamics of pill-shaped Janus particles with stick and slip boundary conditionsFeb 11 2019We study the forces and torques experienced by pill-shaped Janus particles of different aspect ratios where half of the surface obeys the no-slip boundary condition and the other half obeys the Navier slip condition of varying slip lengths. Using a recently ... More
Transition from confined to bulk dynamics in symmetric star-linear polymer mixturesFeb 10 2019We report on the linear viscoelastic properties of mixtures comprising multiarm star (as model soft colloids) and long linear chain homopolymers in a good solvent. In contrast to earlier works, we investigated symmetric mixtures (with a size ratio of ... More
The effect of finite pore length on ion structure and chargingFeb 10 2019Nanoporous supercapacitors play an important role in modern energy storage systems, and their modeling is essential to predict and optimize the charging behaviour. Two classes of models have been developed that consist of finite and infinitely long pores. ... More
No net motion for oscillating near-spheres at low Reynolds numbersFeb 10 2019We investigate the flow around an oscillating nearly-spherical particle at low, yet non-vanishing, Reynolds numbers, and the potential resulting locomotion. We analytically demonstrate that no net motion can arise up to order one in Re and order one in ... More
Isotropic-Nematic Transition and Demixing Behaviour in Binary Mixtures of Hard Spheres and Hard Spherocylinders Confined in a Disordered Porous Medium: Scaled Particle TheoryFeb 09 2019We develop the scaled particle theory to describe the thermodynamic properties and orientation ordering of a binary mixture of hard spheres (HS) and hard spherocylinders (HSC) confined in a disordered porous medium. Using this theory the analytical expressions ... More
Superfast collective motion of magnetic particlesFeb 09 2019It is well-known that magnetic forces can induce a formation of densely packed strings of magnetic particles or even sheafs of several strings (spindles). Here we show that in a sufficiently strong magnetic field, more complex aggregates of particles, ... More
Peculiarities in the gravitational field of a filamentary ringFeb 09 2019The gravitational field of a massive, filamentary ring is considered. We provide an analytic expression for the gravitational potential and demonstrate that the exact gravitational potential and its gradient, thus the gravitational force-field, is not ... More
Conformational switching of chiral colloidal rafts regulates raft-raft attractions and repulsionsFeb 09 2019Membrane-mediated particle interactions depend both on the properties of the particles themselves and the membrane environment in which they are suspended. Experiments have shown that chiral rod-like inclusions dissolved in a colloidal membrane of opposite ... More
The intertwined roles of particle shape and surface roughness in controlling the shear strength of a granular materialFeb 08 2019Both the shape of individual particles and their surface properties contribute to the strength of a granular material under shear. Here we show the degree to which these two aspects can be intertwined. In experiments on assemblies of 3D printed, convex ... More
The failure of the Classical Nucleation Theory at low temperatures resolvedFeb 08 2019A relevant observation about crystal nucleation kinetics in glass-forming substances has been a matter of intense debate for several decades. The Classical Nucleation Theory (CNT) allegedly fails to describe the temperature dependence of the homogeneous ... More
Efficient sliding locomotion with isotropic frictionFeb 08 2019Snakes' bodies are covered in scales that make it easier to slide in some directions than in others. This frictional anisotropy allows for sliding locomotion with an undulatory gait, one of the most common for snakes. Isotropic friction is a simpler situation ... More
Escape rate of transiently active Brownian particle in one dimensionFeb 08 2019Activity significantly enhances the escape rate of a Brownian particle over a potential barrier. Whereas constant activity has been extensively studied in the past, little is known about the effect of time-dependent activity on the escape rate of the ... More
Fractal nature of protein structures affects their Vibrational Energy ExchangeFeb 08 2019Recent vibrational energy exchange experiments on a protein have been explained employing the relation, not new in itself, between protein and fractal structure. The differnce in the scaling exponent of specific part of the protein entails a distinct ... More
Diffusion of Colloidal Rods in Corrugated ChannelsFeb 08 2019In many natural and artificial devices diffusive transport takes place in confined geometries with corrugated boundaries. Such boundaries cause both entropic and hydrodynamic effects, which have been studied only for the case of spherical particles. Here ... More
Dynamics of a large population of red blood cells under shear flowFeb 08 2019An exhaustive description of the dynamics under shear flow of a large number of red blood cells in dilute regime is proposed, which highlights and takes into account the dispersion in cell properties within a given blood sample. Physiological suspending ... More
First passage of a particle in a potential under stochastic resetting: a vanishing transition of optimal resetting rateFeb 08 2019First passage in a stochastic process may be influenced by the presence of an external confining potential, as well as "stochastic resetting" in which the process is repeatedly reset back to its initial position. Here we study the interplay between these ... More
Laboratory experiment and DEM simulation of granular heap flows under vertical vibrationFeb 08 2019Granular flow dynamics on a vertically vibrated pile is studied by means of both laboratory experiments and numerical simulations. As already revealed, the relation between the depth-averaged velocity and slope of a fluidized granular pile, which is measured ... More
Influence of Bonded Interactions on Structural Phases of Flexible PolymersFeb 07 2019We introduce a novel coarse-grained bead-spring model for flexible polymers to systematically examine the effects of an adjusted bonded potential on the formation and stability of structural macrostates in a thermal environment. The density of states ... More
Effects of non-pairwise repulsion on nanoparticle assemblyFeb 07 2019Electrostatic interactions provide a convenient way to modulate interactions between nanoparticles, colloids, and biomolecules because they can be adjusted by the solution pH or salt concentration. While the presence of salt provides an easy method to ... More
A minimal model for nematic cell ordering in tissueFeb 07 2019Recent advances mean that samples of artificial tissue can now be grown. Hence there is a need for theoretical understanding of these tissues commensurate with the size of experimental systems. We present a minimal model for predicting cell orientations ... More
Eshelby ensemble of highly viscous flow out of equilibriumFeb 07 2019The recent description of the highly viscous flow in terms of irreversible structural Eshelby rearrangements is extended to calculate the heat capacity of a glass former at a constant cooling rate through the glass transition. The result is compared to ... More
Shape Transformations of Vesicles induced by Swim PressureFeb 07 2019Shape transformations of living cells and instabilities of cell membranes are of central biological importance, underlying cell migration, cell budding, and endo- and exocytosis. These transitions are controlled not only by osmotic forces and the bending ... More
Packing Concave Molecules in Crystals and Amorphous Solids: On the Connection between Shape and Local StructureFeb 07 2019The structure of the densest crystal packings is determined for a variety of concave shapes in 2D constructed by the overlap of two or three disks. The maximum contact number per particle pair is defined and proposed as a useful means of categorizing ... More
On the Molecular Origin of the Cooperative Coil-to-globule Transition of Poly(N-isopropylacrylamide) in WaterFeb 07 2019Feb 08 2019By means of atomistic molecular dynamics simulations we investigate the behaviour of poly(N-isopropylacrylamide), PNIPAM, in water at temperatures below and above the lower critical solution temperature (LCST), including the undercooled regime. The transition ... More
On the Molecular Origin of the Cooperative Coil-to-globule Transition of Poly(N-isopropylacrylamide) in WaterFeb 07 2019By means of atomistic molecular dynamics simulations we investigate the behaviour of poly(N-isopropylacrylamide), PNIPAM, in water at temperatures below and above the lower critical solution temperature (LCST), including the undercooled regime. The transition ... More
Rheological investigation of gels formed by competing interactions: A numerical studyFeb 07 2019A transition from solid-like to liquid-like behavior occurs when colloidal gels are subjected to a prolonged exposure to a steady shear. This phenomenon, which is characterized by a yielding point, is found to be strongly dependent on the packing fraction. ... More
Swimming to Stability: Structural and Dynamical Control via Active DopingFeb 06 2019External fields can decidedly alter the free energy landscape of soft materials and can be exploited as a powerful tool for the assembly of targeted nanostructures and colloidal materials. Here, we use computer simulations to demonstrate that nonequilibrium ... More
Ionic conductivity of deep eutectic solvents: The role of orientational dynamics and glassy freezingFeb 06 2019We have performed a thorough examination of the reorientational relaxation dynamics and the ionic charge transport of three typical deep eutectic solvents, ethaline, glyceline and reline by broadband dielectric spectroscopy. Our experiments cover a broad ... More
Molecular motors govern liquid-like ordering and fusion dynamics of bacterial coloniesFeb 06 2019Bacteria can adjust the structure of colonies and biofilms to enhance their survival rate under external stress. Here, we explore the link between bacterial interaction forces and colony structure. We show that the activity of extracellular pilus motors ... More
Brownian dynamics simulations of oblate and prolate colloidal particles in nematic liquid crystalsFeb 06 2019It is well known that understanding the transport properties of liquid crystals (LCs) is crucial to optimise their performance in a number of technological applications. In this work, we analyse the effect of shape anisotropy on the diffusion of rod-like ... More
Active acoustic switches using 2D granular crystalsFeb 06 2019We employ numerical simulations to study active transistor-like switches made from two-dimensional (2D) granular crystals containing two types of grains with the same size, but different masses. We tune the mass contrast and arrangement of the grains ... More
Kelvin-Froude wake patterns of a traveling pressure disturbanceFeb 05 2019According to Kelvin, a point pressure source uniformly traveling over the surface of deep calm water leaves behind universal wake pattern confined within $39^{\circ}$ sector and consisting of the so-called transverse and diverging wavefronts. Actual ship ... More
Substrate Roughness Significantly Affects Bilayer Phase SeparationFeb 05 2019Supported Lipid Bilayers (SLBs) are model membranes formed at solid substrate surfaces. This architecture renders membranes experimentally accessible to surface sensitive techniques used to study their properties, including Atomic Force Microscopy (AFM), ... More
Homogeneous and heterogeneous populations of active rods in two-dimensional channelsFeb 05 2019Active swarms, consisting of individual agents which consume energy to move or produce work, are known to generate a diverse range of collective behaviors. Many examples of active swarms are biological in nature (e.g., fish shoals and bird flocks) and ... More
Relaxation of weakly self-propelled particles dramatically changes at glass transitionFeb 05 2019We study experimentally the response of a dense sediment of Brownian particles to self-propulsion. We observe that the ergodic supercooled liquid relaxation is monotonically enhanced by activity. By contrast the nonergodic glass shows an order of magnitude ... More
Crawling in a fluidFeb 05 2019There is increasing evidence that mammalian cells not only crawl on substrates but can also swim in fluids. To elucidate the mechanisms of the onset of motility of cells in suspension, a model which couples actin and myosin kinetics to fluid flow is proposed ... More
Determination of pressure-viscosity relation of 2,2,4-trimethylhexane by all-atom molecular dynamics simulationsFeb 04 2019The Newtonian viscosity of 2,2,4-trimethylhexane at 293K is determined at pressures from 0.1MPa to 1000MPa. Non-equilibrium molecular dynamics simulations are performed using AIREBO-M, an all-atom potential for hydrocarbons especially parameterized for ... More
Dissipation and plastic deformation in collisions between metallic nanoparticlesFeb 04 2019Collisions between amorphous Fe nanoparticles were studied using molecular-dynamics simulation. For head-on collisions of nanoparticles with radii $R =$ 1.4 nm, $R =$ 5.2 nm, and $R =$ 11 nm, sticking was observed at all simulated velocities. The results ... More
Trajectories of a droplet driven by an internal active deviceFeb 04 2019We consider a liquid droplet which is propelled solely by internal flow. In a simple model, this flow is generated by an autonomous actuator, which moves on a prescribed trajectory inside the droplet. In a biological system, the device could represent ... More
Buoyancy-driven flow through a bed of solid particles produces a new form of Rayleigh-Taylor turbulenceFeb 04 2019Rayleigh--Taylor fluid turbulence through a bed of rigid, finite-size, spheres is investigated by means of high-resolution Direct Numerical Simulations (DNS), fully coupling the fluid and the solid phase via a state-of-the art Immersed Boundary Method ... More
Dynamics of particle moving on one dimensional Lorentz lattice gasFeb 04 2019We study the dynamics of a particle moving on one-dimensional Lorentz lattice-gas where particle performs mainly three different kind of motion {\it viz} ballistic motion, normal diffusion and confinement. There are two different types of scatterers, ... More
The Influence of Distant Boundaries on the Solvation of Charged ParticlesFeb 02 2019The long-ranged nature of the Coulomb potential requires a proper accounting for the influence of even distant electrostatic boundaries in the determination of the solvation free energy of a charged solute. We introduce an exact rewriting of the free ... More