Latest in cond-mat.soft

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Active crystals on a sphereFeb 14 2018Two-dimensional crystals on curved manifolds exhibit nontrivial defect structures. Here, we consider "active crystals" on a sphere, which are composed of self-propelled colloidal particles. Our work is based on a new phase-field-crystal-type model that ... More
Capillary-driven binding of thin triangular prisms at fluid interfacesFeb 08 2018We observe capillary-driven binding between thin, equilateral triangular prisms at a flat air-water interface. The edge length of the equilateral triangle face is 120 $\mu m$, and the thickness of the prism is varied between 2 and 20 $\mu m$. For thickness ... More
Transient dynamics of electric double layer capacitors: Exact expressions within the Debye-Falkenhagen approximationFeb 08 2018We revisit a classical problem of theoretical electrochemistry: the response of an electric double layer capacitor (EDLC) subject to a small, suddenly-applied external potential. We solve the Debye-Falkenhagen equation to obtain exact expressions for ... More
Folding mechanisms at finite temperatureFeb 08 2018Folding mechanisms are zero elastic energy motions essential to the deployment of origami, linkages, reconfigurable metamaterials and robotic structures. In this paper, we determine the fate of folding mechanisms when such structures are miniaturized ... More
Assembling single colloidal crystals in inverted micro-fluidic pumpsFeb 07 2018We propose a simple seedless approach to assemble millimeter sized monolayer single colloidal crystals with desired orientations at predetermined locations on an unstructured charged substrate. This approach utilizes the millimeter-ranged fluid flow on ... More
Wrinkles, folds and plasticity in granular raftsFeb 07 2018We investigate the mechanical response of a compressed monolayer of large and dense particles at a liquid-fluid interface: a granular raft. Upon compression, rafts first wrinkle; then, as the confinement increases, the deformation localizes in a unique ... More
Towards Understanding the Structure, Dynamics and Bio-activity of Diabetic Drug MetforminFeb 07 2018Small molecules are often found to exhibit extraordinarily diverse biological activities. Metformin is one of them. It is widely used as anti-diabetic drug for type-two diabetes. In addition to that, metformin hydrochloride shows anti-tumour activities ... More
Forceless Sadowsky strips are sphericalFeb 07 2018We show that thin rectangular ribbons, defined as energy-minimising configurations of the Sadowsky functional for narrow developable elastic strips, have a propensity to form spherical shapes in the sense that forceless solutions lie on a sphere. This ... More
Activity induced synchronizationFeb 07 2018Synchronization, the emergence of temporally coordinated behavior in large populations of interacting elements, occurs on many different length scales, from biological to social systems, generating phenomena like the unison flashing of fireflies, the ... More
Note: On the dielectric constant of nanoconfined waterFeb 06 2018Investigations of dielectric properties of water in nanoconfinement are highly relevant for various applications. Here, using a simple capacitor model, we show that the low dielectric constant of nanoconfined water found in molecular dynamics simulations ... More
The heavy windlass: Buckling and coiling of an elastic rod inside a liquid drop in the presence of gravityFeb 06 2018A liquid drop sitting on an elastic rod may act as a winch, or windlass, and pull the rod inside itself and coil it. This windlass effect has been shown to be generated by surface tension forces and to work best for small systems. Here we study the case ... More
Three-disk microswimmer in a supported fluid membraneFeb 06 2018A model of three-disk micromachine swimming in a quasi two-dimensional supported membrane is proposed. We calculate the average swimming velocity as a function of the disk size and the arm length. Due to the presence of the hydrodynamic screening length ... More
Motility induces a double positive effect of E. coli dispersion in porous mediaFeb 06 2018The role of motility on the hydrodynamic dispersion of bacteria in a porous media is here studied by tracking thousands of bacteria in a microfluidic chip containing randomly placed obstacles. We first evaluate the dynamics of the spreading of two populations ... More
Reshaping of a Janus ringFeb 05 2018We consider reshaping of closed Janus filaments acquiring intrinsic curvature upon actuation of an active component -- a nematic elastomer elongating upon phase transition. Linear stability analysis establishes instability thresholds of circles with no ... More
Corner transport upwind lattice Boltzmann model for bubble cavitationFeb 05 2018Aiming to study the bubble cavitation problem in quiescent and sheared liquids, a third-order isothermal lattice Boltzmann (LB) model that describes a two-dimensional ($2D$) fluid obeying the van der Waals equation of state, is introduced. The evolution ... More
Lipid-protein interaction induced domains: kinetics and conformational changes in multicomponent vesiclesFeb 03 2018The spatio-temporal organization of proteins and the associated morphological changes in membranes are of importance in cell signaling. Several mechanisms that promote the aggregation of proteins at low cell surface concentrations have been investigated ... More
Persistence of perfect packing in twisted bundles of elastic filamentsFeb 03 2018It is generally understood that geometric frustration prevents maximal hexagonal packings in uniform filament bundles upon twist. We demonstrate that a hexagonal packed elastic filament bundle can preserve its order over a wide range of twist due to a ... More
Oscillating Modes of Driven Colloids in Overdamped SystemsFeb 03 2018Microscopic particles suspended in liquids are the prime example of an overdamped system because viscous forces dominate over inertial effects. Apart from their use as model systems, they receive considerable attention as sensitive probes from which forces ... More
Interaction of Charged Colloidal Particles at the Air-Water InterfaceFeb 02 2018We study, using Monte Carlo simulations, the interaction between charged colloidal particles confined to the air-water interface. The dependence of force on ionic strength and counterion valence is explored. For 1:1 electrolyte, we find that the electrostatic ... More
Langevin equations for the run-and-tumble of swimming bacteriaFeb 01 2018The run and tumble motions of a swimming bacterium are well characterized by two stochastic variables: the speed $v(t)$ and the change of direction or deflection \mbox{$x(t)=\cos\varphi(t)$}, where $\varphi(t)$ is the turning angle at time $t$. Recently, ... More
Modeling Coating Flow and Surfactant Dynamics inside the Alveolar CompartmentFeb 01 2018We derive a new model for the coating flow inside the alveolar compartment, taking into account pulmonary surfactant production and recycling by Type 2 cells as well as its degradation. As the thickness of alveolar coating is much smaller than the average ... More
Introducing particle flexibility into a density functional description of nematics and cholestericsJan 31 2018Feb 02 2018We describe a general implementation of the Fynewever-Yethiraj density functional theory (DFT) for the investigation of nematic and cholesteric self-assembly in arbitrary solutions of semi-flexible polymers. The basic assumptions of the theory are discussed ... More
Dual free energies in Poisson-Boltzmann theoryJan 31 2018Poisson-Boltzmann theory is the underpinning to essentially all soft matter and biophysics problems involving point-like charges of low valencies, in the form of counter-ions or dissolved salts. Going beyond the mean-field approach typically requires ... More
Water's interfacial hydrogen bonding structure reveals the effective strength of surface-water interactionsJan 31 2018The interactions of a hydrophilic surface with water can significantly influence the characteristics of the liquid water interface. In this manuscript, we explore this influence by studying the molecular structure of liquid water at a disordered surface ... More
Field-driven dynamical demixing of binary mixturesJan 30 2018We consider mixtures of two species of spherical colloidal particles that differ in their hydrodynamic radii, but are otherwise identical, in the presence of an external field. Since the particle-particle and particle-field interactions are the same for ... More
Efficient mesoscale hydrodynamics: multiparticle collision dynamics with massively parallel GPU accelerationJan 30 2018We present an efficient open-source implementation of the multiparticle collision dynamics (MPCD) algorithm that scales to run on hundreds of graphics processing units (GPUs). We especially focus on optimizations for modern GPU architectures and communication ... More
Phase diagram and melting scenarios of two-dimensional Hertzian spheresJan 30 2018We present computer simulations of a system of purely repulsive soft colloidal particles interacting via the Hertz potential and constrained to a two-dimensional plane. This potential describes the elastic interaction of weakly deformable bodies and can ... More
Do the contact angle and line tension of surface-attached droplets depend on the radius of curvature?Jan 30 2018Results from Monte Carlo simulations of wall-attached droplets in the three-dimensional Ising lattice gas model and in a symmetric binary Lennard-Jones fluid, confined by antisymmetric walls, are analyzed, with the aim to estimate the dependence of the ... More
Spatiotemporal intermittency and localized dynamic fluctuations upon approaching the glass transitionJan 30 2018We introduce a new and robust approach for characterizing spatially and temporally heterogeneous behavior within a system based on the evolution of dynamic fuctuations once averaged over different space lengths and time scales. We apply it to investigate ... More
Optonanofluidics: Modelling fluid flow through surfactant-modified liquid tethers by laser beamsJan 29 2018When a surfactant-stabilised oil droplet with an ultralow interfacial tension is trapped in the focus of two laser beams and pulled apart (by moving the laser beams) a configuration of two droplets connected by a thin tether of oil results. The tether ... More
Impact of roughness on the instability of a free-cooling granular gasJan 29 2018A linear stability analysis of the hydrodynamic equations with respect to the homogeneous cooling state is carried out to identify the conditions for stability of a granular gas of rough hard spheres. The description is based on the results for the transport ... More
Pressure evolution and deformation of confined granular media during pneumatic fracturingJan 29 2018By means of digital image correlation, we experimentally characterize the deformation of a dry granular medium confined inside a Hele-Shaw cell due to air injection at a constant overpressure high enough to deform it (from 50 to 250 kPa). Air injection ... More
Borosilicones and viscoelastic silicone rubbers: network liquids and network solidsJan 28 2018Borosilicones (e.g., Silly Putty) have been known for 70 years, but their peculiar behaviors have remain unexplained. In this work, experiment and theory are used to show that they are network liquids---dynamic macromolecules that appear elastic on short ... More
Theoretical bounds for the exponent in the empirical power-law advance-time curve for surface flowJan 28 2018A fundamental and widely applied concept used to study surface flow processes is the advance-time curve characterized by an empirical power law with an exponent r and a numerical prefactor p (i.e., x = p*t^r). In the literature, different values of r ... More
Edge-induced shear banding in entangled polymeric fluidsJan 26 2018Despite decades of research, the question of whether solutions and melts of highly entangled polymers exhibit shear banding as their steady state response to a steadily imposed shear flow remains controversial. From a theoretical viewpoint, an important ... More
Time-delayed feedback control of shear-driven micellar systemsJan 26 2018Feb 05 2018Suspensions of elongated micelles under shear display complex non-linear behaviour including shear banding, spatio-temporal oscillatory patterns and chaotic response. Based on a suitable rheological model [S. M. Fielding and P. D. Olmsted, Phys. Rev. ... More
Isotropic-nematic transition of self-propelled rods in three dimensionsJan 26 2018Using overdamped Brownian dynamics simulations we investigate the isotropic-nematic (IN) transition of self-propelled rods in three spatial dimensions. For two well-known model systems (Gay-Berne potential and hard spherocylinders) we find that turning ... More
Antimargination of microparticles and platelets in the vicinity of branching vesselsJan 26 2018We investigate the margination of microparticles/platelets in blood flow through complex geometries typical for in vivo vessel networks: a vessel confluence and a bifurcation. Using 3D Lattice-Boltzmann simulations, we find that behind the confluence ... More
Translocation Mobilities of Proteins in Nanopores: A Coarse-Grained Molecular Dynamics StudyJan 26 2018We investigate the translocation of a protein through model nanopores using coarse-grained (CG) non-equilibrium molecular dynamics (NEMD) simulations and compare the results with a continuum model. We considered the effects of nanopore confinement and ... More
Dynamic Control of Particle Deposition in Evaporating Droplets by an External Point Source of VaporJan 24 2018The deposition of particles on a surface by an evaporating sessile droplet is important for phenomena as diverse as printing, thin-film deposition and self-assembly. The shape of the final deposit depends on the flows within the droplet during evaporation. ... More
The yielding transition in periodically sheared binary glasses at finite temperatureJan 24 2018Non-equilibrium molecular dynamics simulations are performed to investigate the dynamic behavior of three-dimensional binary glasses prepared via an instantaneous quench across the glass transition. We found that with increasing strain amplitude up to ... More
Why does hydronium diffuse faster than hydroxide in liquid water?Jan 24 2018Proton transfer via hydronium and hydroxide ions in water is ubiquitous. It underlies acid-base chemistry, certain enzyme reactions, and even infection by the flu. Despite two-centuries of investigation, the mechanism underlying why hydronium diffuses ... More
Composition inversion in mixtures of binary colloids and polymerJan 23 2018Understanding the phase behaviour of mixtures continues to pose challenges, even for systems that might be considered "simple". Here we consider a very simple mixture of two colloidal and one non-adsorbing polymer species which can be simplified even ... More
Quantized Self-Assembly of Discotic Rings in a Liquid Crystal Confined in NanoporesJan 23 2018Disklike molecules with aromatic cores spontaneously stack up in linear columns with high, one-dimensional charge carrier mobilities along the columnar axes making them prominent model systems for functional, self-organized matter. We show by high-resolution ... More
Dynamic characterization of cellulose nanofibrils in sheared and extended semi-dilute dispersionsJan 23 2018New materials made through controlled assembly of dispersed cellulose nanofibrils (CNF) has the potential to develop into biobased competitors to some of the highest performing materials today. The performance of these new cellulose materials depends ... More
Adsorption isotherms of charged nanoparticlesJan 23 2018We present theory and simulations which allow us to quantitatively calculate the amount of surface adsorption excess of charged nanoparticles onto a charged surface. The theory is very accurate for weakly charged nanoparticles and can be used at physiological ... More
Hard competition: stabilizing the elusive biaxial nematic phase in suspensions of colloidal particles with extreme lengthsJan 22 2018Jan 26 2018We use computer simulations to study the existence and stability of a biaxial nematic $N_b$ phase in systems of hard polyhedral cuboids, triangular prisms, and rhombic platelets, characterized by a long ($L$), medium ($M$), and short ($S$) particle axis. ... More
Comparison of Single-Ion Molecular Dynamics in Common SolventsJan 22 2018Laying a basis for molecularly specific theory for the mobilities of ions in solutions of practical interest, we report a broad survey of velocity autocorrelation functions (VACFs) of Li$^+$ and PF$_6{}^-$ ions in water, ethylene carbonate, propylene ... More
Transient start-up dynamics and shear banding in aging soft glassy materials: Rate-controlled flow fieldJan 22 2018We study the transient start-up dynamics of a fluidity model which captures the rheological behavior of aging soft glassy materials, in a rectilinear shear flow upon application of step shear rate. We observe that when the steady state flow curve is non-monotonic ... More
The effect of AC electric field on the dynamics of a vesicle under shear flow in the small deformation regimeJan 20 2018Vesicles or biological cells under simultaneous shear and electric field can be encountered in dielectrophoretic devices or devices used for continuous flow electrofusion or electroporation. In this work, the dynamics of a vesicle subjected to simultaneous ... More
Shape deformation of a vesicle under axisymmetric non-uniform alternating electric fieldJan 20 2018Non-uniform fields are commonly used to study vesicle dielectrophoresis and can be used to hitherto relatively unexplored areas of vesicle deformation and electroporation. A common but perplexing problem in vesicle dynamics is the cross over from the ... More
Self-diffusiophoresis induced by fluid interfacesJan 19 2018The influence of a fluid-fluid interface on self-phoresis of chemically active, axially symmetric, spherical colloids is analyzed. Distinct from the studies of self-phoresis for colloids trapped at fluid interfaces or in the vicinity of hard walls, here ... More
The Kirkwood-Riseman Polymer Model of Polymer Dynamics is Qualitatively CorrectJan 18 2018We use Brownian dynamics to show: For an isolated polymer coil, the Kirkwood-Riseman model for chain motion is qualitatively correct. The Rouse model for chain motion is qualitatively incorrect. The models are qualitatively different. Kirkwood and Riseman ... More
Competitive dynamics of two erosion patterns around a cylinderJan 17 2018Jan 26 2018We investigate experimentally the local erosion of a granular bed near a fixed vertical cylinder that emerges from the bed. The onset of erosion arising at the base of the cylinder and usually ascribed to the wrapping horseshoe vortex is determined and ... More
The simultaneous discharge of liquid and grains from a siloJan 17 2018The flow rate of water through an orifice at the bottom of a container depends on the hydrostatic pressure whereas for a dry granular material is nearly constant. But what happens during the simultaneous discharge of grains and liquid from a silo? By ... More
The mechanical influence of single fibre inclusions in discrete fibre networksJan 17 2018Semiflexible biopolymer networks are commonly found in biological systems, from the cytoskeleton of cells to the extracellular matrix. Such networks often naturally occur as composites, in which various components interact to generate rich mechanical ... More
Simulations of Coulomb systems with slab geometry using an efficient 3d Ewald summation methodJan 17 2018We present a new approach to efficiently simulate electrolytes confined between infinite charged walls using a 3d Ewald summation method. The optimal performance is achieved by separating the electrostatic potential produced by the charged walls from ... More
Controlling polyelectrolyte adsorption onto carbon nanotubes by tuning ion-image interactionsJan 17 2018Understanding and controlling polyelectrolyte adsorption onto carbon nanotubes is a fundamen- tal challenge in nanotechology. Polyelectrolytes have been shown to stabilise nanotube suspensions through adsorbing onto the nanotube surface, and polyelectrolyte-coated ... More
A multiscale method for simulating fluid interfaces covered with large molecules such as asphaltenesJan 17 2018(Abbreviated) In this paper we report on the development of a multiscale method for simulating complex liquid-liquid systems such as water in contact with oil containing asphaltenes. We consider simulations where water drops covered with asphaltenes are ... More
Drop impact dynamics on slippery liquid-infused porous surfaces: influence of oil thicknessJan 16 2018Slippery liquid-infused porous surfaces (SLIPS) are porous nanostructures impregnated with a low surface tension lubricant. They have recently shown great promise in various applications that require non-wettable superhydrophobic surfaces. In this paper, ... More
Self-Consistent Description of Local Density Dynamics in Simple Liquids. The Case of Molten LithiumJan 15 2018The dynamic structure factor is the quantity, which can be measured by means of Brillouin light-scattering as well as by means of inelastic scattering of neutrons and X-rays. The spectral (or frequency) moments of the dynamic structure factor define directly ... More
Enhanced nanosecond electro-optic effect in isotropic and nematic phases of dielectrically negative nematics doped by strongly polar additiveJan 12 2018An electric field can induce or modify optical birefringence in both the isotropic and nematic phases of liquid crystals (LCs). In the isotropic phase, the electric field induces birefringence with an optical axis along the field. The phenomenon is known ... More
Interpretation of the vibrational spectra of glassy polymers using coarse-grained simulationsJan 12 2018Jan 16 2018The structure and vibrational density of states (VDOS) of polymer glasses are investigated using numerical simulations based on the classical Kremer-Grest bead-spring model. We focus on the roles of chain length and bending stiffness, the latter being ... More
Roughness-dependent tribology effects on discontinuous shear thickeningJan 11 2018Surface roughness affects many properties of colloids, from depletion [1] and capillary interactions [2], to their dispersibility [3] and use as emulsion stabilizers [4]. It also impacts particle-particle frictional contacts, which have recently emerged ... More
Simulations of Polyelectrolyte Adsorption to a Dielectric Like-Charged SurfaceJan 11 2018We explore, using the recently developed efficient Monte Carlo simulation method, the interaction of an anionic polyelectrolyte solution with a like-charged dielectric surface. In addition to polyions, the solution also contains salt with either monovalent, ... More
Effect of dielectric discontinuity on a spherical polyelectrolyte brushJan 11 2018In this paper we perform molecular dynamics simulations of a spherical polyelectrolyte brush and counterions in a salt-free medium. The dielectric discontinuity on the grafted nanoparticle surface is taken into account by the method of image charges. ... More
Biases in particle localization algorithmsJan 10 2018Automated particle locating algorithms have revolutionized microscopy image analysis, enabling researchers to rapidly locate many particles to within a few pixels in a microscope image. The vast majority of these algorithms operate through heuristic approaches ... More
Inverse Design of Multicomponent AssembliesJan 09 2018Inverse design can be a useful strategy for discovering interactions that drive particles to spontaneously self-assemble into a desired structure. Here, we extend an inverse design methodology--relative entropy optimization--to determine isotropic interactions ... More
Liquid crystalline cellulose-based nematogelsJan 08 2018Physical properties of composite materials can be pre-engineered by controlling their structure and composition at the mesoscale. Yet, approaches for achieving this are limited and rarely scalable. We introduce a new breed of self-assembled nematogels ... More
Deformation of a biconcave-discoid capsule in extensional flow and electric fieldJan 06 2018Biconcave-discoid (empirical shape of a red blood cell) capsule finds numerous applications in the field of bio-fluid dynamics and rheology, apart from understanding the behavior of red blood cells (RBC) in blood flow. A detailed analysis is, therefore, ... More
Liquid crystal elastomer coatings with programmed response of surface profileJan 03 2018Stimuli-responsive liquid crystal elastomers (LCEs) with a strong coupling of orientational molecular order and rubber-like elasticity, show a great potential as working elements in soft robotics, sensing, transport and propulsion systems. We demonstrate ... More
Continuum Percolation of Polydisperse Rods in Quadrupole Fields: Theory and SimulationsJan 03 2018We investigate percolation in mixtures of nanorods in the presence of external fields that align or disalign the particles with the field axis. Such conditions are found in the formulation and processing of nanocomposites, where the field may be electric, ... More
Quantum Monte Carlo calculations of van der Waals interactions between aromatic benzene ringsJan 03 2018The magnitude of finite-size effects and Coulomb interactions in quantum Monte Carlo simulations of van der Waals interactions between weakly bonded benzene molecules are investigated. We assess the impact of the backflow coordinate transformation to ... More
Orientational dependence of the van der Waals interactions for finite-sized particlesJan 03 2018Van der Waals forces as interactions between neutral and polarisable particles act at small distances between two objects. Their theoretical origin lies in the electromagnetic interaction between induced dipole moments caused by the vacuum fluctuations ... More
Structural transformations in porous glasses under mechanical loading. II. CompressionDec 29 2017The role of porous structure and glass density in response to compressive deformation of amorphous materials is investigated via molecular dynamics simulations. The disordered, porous structures were prepared by quenching a high-temperature binary mixture ... More
Particle Ice Front Interaction - The Brownian Ratchet ModelDec 29 2017We treat the problem of particle pushing by growing ice as a free diffusion near a wall that moves with discrete steps. When the particle diffuse away from the surface the surface can grow, blocking the particle from going back. Elementary calculations ... More
Role of Non-Equilibrium Conformations on Driven Polymer TranslocationDec 29 2017One of the major theoretical methods in understanding polymer translocation through a nanopore is the Fokker-Planck formalism based on the assumption of quasi-equilibrium of polymer conformations. The criterion for applicability of the quasi-equilibrium ... More
Chiral liquid crystal colloidsDec 28 2017Colloidal particles disturb the alignment of rod-like molecules of liquid crystals, giving rise to long-range interactions that minimize the free energy of distorted regions. Particle shape and topology are known to guide this self-assembly process. However, ... More
Liquid crystal self-assembly of upconversion nanorods enriched by depletion forces for mesostructured material preparationDec 28 2017Monodisperse rod-like colloidal particles are known for spontaneously forming both nematic and smectic liquid crystal phases, but their self-assembly was typically exploited from the fundamental soft condensed matter physics perspective. Here we demonstrate ... More
Repulsion-attraction switching of nematic colloids formed by liquid crystal dispersions of polygonal prismsDec 28 2017Self-assembly of colloidal particles due to elastic interactions in nematic liquid crystals promises tunable composite materials and can be guided by exploiting surface functionalization, geometric shape and topology, though these means of controlling ... More
Active Brownian particles near straight or curved walls: Pressure and boundary layersDec 27 2017Unlike equilibrium systems, active matter is not governed by the conventional laws of thermodynamics. Through a series of analytic calculations and Langevin dynamics simulations, we explore how systems cross over from equilibrium to active behavior as ... More
Tuning and Switching a Plasmonic Quantum Dot Sandwich in a Nematic Line DefectDec 27 2017We study the quantum-mechanical effects arising in a single semiconductor core/shell quantum dot controllably sandwiched between two plasmonic nanorods. Control over the position and the sandwich confinement structure is achieved by the use of a linear-trap, ... More
Phase-coexisting patterns, horizontal segregation and controlled convection in vertically vibrated binary granular mixturesDec 27 2017We report new patterns, consisting of coexistence of sub-harmonic/harmonic and asynchronous states [for example, a granular gas co-existing with (i) bouncing bed, (ii) undulatory subharmonic waves and (iii) Leidenfrost-like state], in experiments on vertically ... More
Liquid Crystal ColloidsDec 27 2017Colloids are abundant in nature, science and technology, with examples ranging from milk to quantum dots and the "colloidal atom" paradigm. Similarly, liquid crystal ordering is important in contexts ranging from biological membranes to laboratory models ... More
Scaling law of the drag force in dense granular mediaDec 25 2017Making use of the system of pulling a spherical intruder in static three-dimensional granular media, we numerically study the scaling law for the drag force $F_{\rm drag}$ acting on the moving intruder under the influence of the gravity. Suppose if the ... More
Collective behavior of bulk nanobubbles produced by the alternating polarity electrolysisDec 23 2017Nanobubbles in liquids are mysterious gaseous objects having exceptional stability. They promise a wide range of applications but their production is not well controlled and localized. Alternating polarity electrolysis of water is a tool that can control ... More
Microfield distribution in plasmasDec 22 2017We calculate stationary distribution of force acting on charged particle in plasma environment with magnetic interaction between particle and moving charges taken into account. Obtained result is a generalization of Holtsmark distribution and coincides ... More
Collective diffusion of a colloidal particles in a liquid crystalDec 22 2017The collective diffusion effects in system of a colloidal particles in a liquid crystal has been proposed. In this article described peculiarity of collective diffusion colloidal particles in a liquid crystal, which can be observe experimentally. The ... More
Solvent coarsening around colloids driven by temperature gradientsDec 21 2017Using mesoscopic numerical simulations and analytical theory we investigate the coarsening of the solvent structure around a colloidal particle emerging after a temperature quench of the colloid surface. Qualitative differences in the coarsening mechanisms ... More
Design principles for selective self-assembly of active networksDec 07 2017Living cells dynamically modulate the local morphologies of their actin cytoskeletons to perform biological functions, including force transduction, intracellular transport, and cell division. A major challenge is to understand how diverse structures ... More
Critical behavior of active Brownian particlesDec 06 2017We study active Brownian particles as a paradigm for genuine non-equilibrium phase transitions. Access to the critical point in computer simulations is obstructed by the fact that the density is conserved. We propose a modification of sampling finite-size ... More
Thermal and active fluctuations of a compressible bilayer vesicleNov 30 2017We discuss thermal and active fluctuations of a compressible bilayer vesicle by using the results of hydrodynamic theory for vesicles. Coupled Langevin equations for the membrane deformation and the density fields are employed to calculate the power spectral ... More
A salt water battery with high stability and charging rates made from solution processed conjugated polymers with polar side chainsNov 28 2017We report a neutral salt water based battery which uses p-type and n-type solution processed polymer films as the cathode and the anode of the cell. The specific capacity of the electrodes (approximately 30 mAh cm-3) is achieved via formation of bipolarons ... More
Collective behavior of colloids due to critical Casimir interactionsNov 24 2017If colloidal solute particles are suspended in a solvent close to its critical point, they act as cavities in a fluctuating medium and thereby restrict and modify the fluctuation spectrum in a way which depends on their relative configuration. As a result ... More
Softening and Yielding of Soft Glassy MaterialsNov 20 2017Solids deform and fluids flow, but soft glassy materials, such as emulsions, foams, suspensions, and pastes, exhibit an intricate mix of solid and liquid-like behavior. While much progress has been made to understand their elastic (small strain) and flow ... More
Two-component self-contracted droplets: long-range attraction and confinement effectsNov 17 2017Marangoni self-contracted droplets are formed by a mixture of two liquids, one of larger surface tension and larger evaporation rate than the other. Due to evaporation, the droplets contract to a stable contact angle instead of spreading on a wetting ... More
Nanoemulsion stability above the critical micelle concentration: A contest between solubilization, flocculation and Krafft precipitationOct 26 2017Nov 23 2017The relative importance of micelle solubilization and Krafft temperature on the appraisal of the flocculation rate is studied using a dodecane-in-water nanoemulsion as a model system. In 0.5 mM solutions of sodium dodecylsulfate (SDS), neither the critical ... More
Effective Polarisability ModelsOct 13 2017Theories for the effective polarisability of a small particle in a medium are presented using different levels of approximation: we consider the virtual cavity, real cavity and the hard-sphere models as well as a continuous interpolation of the latter ... More
When is a surface foam-phobic or foam-philic?Oct 03 2017By integrating the Young-Laplace equation, including the effects of gravity, we have calculated the equilibrium shape of the two-dimensional Plateau borders along which a vertical soap film contacts two flat, horizontal solid substrates of given wettability. ... More
Entropy Driven Molecular Motion of Semiconducting Polymers in SolutionOct 02 2017We investigate the entropy driven large-scale dynamics of semiconducting conjugated polymers in solution. Neutron spin echo spectroscopy reveals a finite dynamical stiffness that reduces with increasing temperature and molecular weight. The Zimm mode ... More