Latest in cond-mat.soft

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Mechanisms to Splay-Bend Nematic PhasesApr 19 2019While twist-bend nematic phases have been extensively studied, the experimental observation of two dimensional, oscillating splay-bend phases is recent. We consider two theoretical models that have been used to explain the formation of twist-bend phases ... More
Semi-implicit methods for the dynamics of elastic sheetsApr 19 2019Recent applications (e.g. active gels and self-assembly of elastic sheets) motivate the need to efficiently simulate the dynamics of thin elastic sheets. We present semi-implicit time stepping algorithms to improve the time step constraints that arise ... More
Champagne Bubbles : Isolation and Characterization of amphiphilic macromolecules responsible for the stability of the collar at the Champagne / air interfaceApr 19 2019The effervescence and the stability of the ring of fine bubbles crowning the surface of a champagne glass, the "collar", constitute one of the hallmarks of Champagne. Defects in the stability of this collar are not well understood and account for a significant ... More
Quantification of Nematic Cell Polarity in Three-dimensional TissuesApr 18 2019How epithelial cells coordinate their polarity to form complex tissues and organs remains a fundamental question in biology. Here, we characterize a unique type of polarity found in liver tissue - nematic cell polarity, which is different from the common ... More
Wrinkle patterns in active viscoelastic thin sheetsApr 18 2019We show that a viscoelastic thin sheet driven out of equilibrium by active structural remodelling develops a rich variety of shapes as a result of a competition between viscous relaxation and activity. In the regime where active processes are faster than ... More
Spectral shape simplicity of viscous materialsApr 18 2019A broad survey of viscoelastic data demonstrates that van der Waals, hydrogen-bonded, and ionic liquids, as well as polymeric, inorganic, and metallic melts share a structural relaxation pattern virtually insensitive to their morphological details. This ... More
Many-body perturbation theory and fluctuation relations for interacting population dynamicsApr 18 2019Population dynamics deals with the collective phenomena of living organisms, and it has attracted much attention since it is expected to explain how not only living organisms but also human beings have been adapted to varying environments. However, it ... More
The lubricity of mucin solutions is robust against changes in physiological conditionsApr 18 2019Solutions of manually purified gastric mucins have been shown to be promising lubricants for biomedical purposes, where they can efficiently reduce friction and wear. However, so far, such mucin solutions have been mostly tested in specific settings, ... More
Revisiting the fragile-to-strong crossover in metallic glass-forming liquids: application to Cu$_x$Zr$_x$Al$_{100-2x}$Apr 17 2019The fragile-to-strong crossover seems to be a general feature of metallic glass-forming liquids. Here, we study the behavior of shear viscosity, diffusion coefficient and vibrational density of states for Cu$_x$Zr$_x$Al$_{100-2x}$ alloy through molecular ... More
Stimuli-responsive behavior of poly(N-isopropylacrylamide) microgels under interfacial confinementApr 17 2019The volume phase transition of microgels is one of the most paradigmatic examples of stimuli-responsiveness, enabling a collapse from a highly swollen microgel state into a densely coiled state by an external stimulus. Although well characterized in bulk, ... More
Traveling band formation in feedback-driven colloidsApr 17 2019Using simulation and theory we study the dynamics of a colloidal suspension in two dimensions subject to a time-delayed repulsive feedback that depends on the positions of the colloidal particles. The colloidal particles experience an additional potential ... More
Active Lévy Matter: Anomalous Diffusion, Hydrodynamics and Linear StabilityApr 17 2019Anomalous diffusion, manifest as a nonlinear relationship between the position mean square displacement and the temporal duration, and/or non-Gaussian features of the position statistics, is prevalent in biological transport processes. Likewise, collective ... More
Glass Polymorphism in TIP4P/2005 Water: A Description Based on the Potential Energy Landscape FormalismApr 17 2019The potential energy landscape (PEL) formalism is a statistical mechanical approach to describe supercooled liquids and glasses. Here we use the PEL formalism to study the pressure-induced transformations between low-density amorphous ice (LDA) and high-density ... More
Nonlinear force balance at moving contact linesApr 17 2019The spreading of a liquid over a solid material is a key process in a wide range of applications. While this phenomenon is well understood when the solid is undeformable, its "soft" counterpart is still ill-understood and no consensus has been reached ... More
Toughening in a nacre-like soft-hard layered structure due to weak nonlinearity in the soft layerApr 17 2019Recently, it has been found experimentally that hydrated nacre exhibits a nonlinear mechanical response. While mechanical nonlinearity has been shown to be important in other biological structures, such as spider webs, the implications of mechanical nonlinearity ... More
Force induced formation of twisted chiral ribbonsApr 17 2019We study the emergence of helical structures subjected to a stretching force, demonstrating that the force transforms disk-shaped colloidal membranes into twisted chiral ribbons of predetermined handedness. Using an experimental technique that enforces ... More
Ciliary oscillations without external friction near the instability thresholdApr 16 2019Active filaments are prototypical engines of motility at the micron scale. Their motion in viscous fluids is determined by the balance of external drag and internal structural stress. The latter contains both active and passive components that, respectively, ... More
Nucleation and propagation of excitation fronts in self-excited systemsApr 16 2019Frictional interfaces exhibits a very rich dynamical behavior due to frictional interactions. This work focuses on the transition between spatially localized and propagating stick-slip motion. To overcome the difficulties related to the non-smoothness ... More
Random-Organizing Hyperuniform Fluids with Momentum-Conserved ActivationsApr 16 2019Recently, an exotic hyperuniform fluid state was proposed in some non-equilibrium overdamped systems, in which the center of mass conservation (CMC) of local interacting particles was believed to be crucial. In this work, we show that in underdamped systems, ... More
Internal friction can be measured with the Jarzynski equalityApr 16 2019A simple protocol for the extraction of the internal friction coefficient of polymers is presented. The proposed scheme necessitates repeatedly stretching the polymer molecule, and measuring the average work dissipated in the process by applying the Jarzynski ... More
The role of deformability in determining the structural and mechanical properties of bubbles and emulsionsApr 16 2019We perform computational studies of jammed particle packings in two dimensions undergoing isotropic compression using the well-characterized soft particle (SP) model and the deformable particle (DP) model that we developed for compressed bubbles and emulsions. ... More
Universal relaxation dynamics of sphere packings below jammingApr 15 2019We show that non-Brownian suspensions of repulsive spheres below jamming display a slow relaxational dynamics with a characteristic time scale that diverges at jamming. This slow time scale is fully encoded in the structure of the unjammed packing and ... More
Multi-species dynamical density functional theory for microswimmers: derivation, orientational ordering, trapping potentials, and shear cellsApr 15 2019Microswimmers typically operate in complex environments. In biological systems, often diverse species are simultaneously present and interact with each other. Here, we derive a (time-dependent) particle-scale statistical description, namely a dynamical ... More
Frictional control of the phase separation of self-propelled particlesApr 15 2019Systems of self-propelled particles have the unique ability to phase separate, in the absence of any attractive interaction, into coexisting liquid and gas-like phases. The liquid clusters are highly dynamic, and continuously form and break through a ... More
Frictional control of the phase separation of self-propelled particlesApr 15 2019Apr 16 2019Systems of self-propelled particles have the unique ability to phase separate, in the absence of any attractive interaction, into coexisting liquid and gas-like phases. The liquid clusters are highly dynamic, and continuously form and break through a ... More
Heat capacity of liquids in light of hydrodynamics as U(1) gauge theoryApr 15 2019We investigate the heat capacity of liquids through a theoretical approach based on a quasiparticle description. By interpreting the microscopic dynamics of particles in liquids in terms of quasiparticles, we suggest a simplified understanding of the ... More
Rigidity and auxeticity transitions in networks with strong bond-bending interactionsApr 15 2019A widely-studied model for gels or biopolymeric fibrous materials are networks with central force interactions, such as Hookean springs. Less commonly studied are materials whose mechanics are dominated by non-central force interactions such as bond-bending ... More
Wetting boundaries for ternary high density ratio Lattice Boltzmann MethodApr 15 2019We extend a recently proposed ternary free energy lattice Boltzmann model with high density contrast, by incorporating wetting boundaries at solid walls. The approaches are based on forcing and geometric schemes, with implementations optimised for ternary ... More
Conformal symmetry breaking and self-similar spiralsApr 15 2019Self-similar curves are shown to arise naturally as tension-free stationary states of conformally invariant energies. Planar logarithmic spirals are associated with the simplest such energy, the conformal arc-length, and their remarkable properties follow ... More
Chemo-mechanical modeling of artificially and naturally bonded soilsApr 13 2019Chemo-mechanical effects are known to be significant in a number of applications in modern geomechanics, ranging from slope stability assessment to soil improvement and CO2 sequestration. This work focuses on coupled chemo-mechanical modeling of bonded ... More
Structural Evolution of Granular Systems: TheoryApr 13 2019A general theory is developed for the evolution of the cell order distribution (COD) in planar granular systems. Dynamic equations are constructed and solved in closed form for several examples: systems under compression; dilation of very dense systems; ... More
Binding potentials for vapour nanobubbles on surfaces using density functional theoryApr 13 2019We calculate density profiles of a simple model fluid in contact with a planar surface using density functional theory (DFT), in particular for the case where there is a vapour layer intruding between the wall and the bulk liquid. We apply the method ... More
Self-diffusion in plastic flow of amorphous solidsApr 13 2019We report on a particle-based numerical study of sheared amorphous solids in the dense slow flow regime. In this framework, deformation and flow are accompanied by critical fluctuation patterns associated with the macroscopic plastic response and single ... More
Nanoparticle diffusion in sheared cellular blood flowApr 13 2019Using a multiscale blood flow solver, the complete diffusion tensor of nanoparticle (NP) in sheared cellular blood flow is calculated over a wide range of shear rate and haematocrit. In the short-time regime, NPs exhibit anomalous dispersive behaviors ... More
Isomorph invariance and thermodynamics of repulsive dense bi-Yukawa one-component plasmasApr 12 2019In numerous realizations of complex plasmas, dust-dust interactions are characterized by two screening lengths and are thus better described by a combination of Yukawa potentials. The present work investigates the static correlations and the thermodynamics ... More
Theory of active particle penetration through a planar elastic membraneApr 12 2019With the rapid advent of biomedical and biotechnological innovations, a deep understanding of the nature of interaction between nanomaterials and cell membranes, tissues, and organs, has become increasingly important. Active penetration of nanoparticles ... More
Probing the degree of heterogeneity within a shear band of a model glassApr 12 2019Recent experiments provide evidence for density variations along shear bands (SB) in metallic glasses with a length scale of a few hundreds nanometers. Via molecular dynamics simulations of a generic binary glass model, here we show that this is strongly ... More
Dualities and non-Abelian mechanicsApr 12 2019Dualities are mathematical mappings that reveal unexpected links between apparently unrelated systems or quantities in virtually every branch of physics. Systems that are mapped onto themselves by a duality transformation are called self-dual and they ... More
Transverse excitations and zigzag transition in quasi-1D hard-disk systemApr 11 2019Molecular dynamics computer simulations of collective excitations in a system of hard disks confined to a narrow channel of the specific width, that resembles 2D triangular lattice at disk close packing, are performed. We found that transverse excitations, ... More
Altered Dielectric Behaviour, Structure and Dynamics of Nanoconfined Dipolar Liquids: Signatures of Enhanced CooperativityApr 11 2019Spherical confinement can alter the properties of a dipolar fluid in several different ways. In an atomistic molecular dynamics simulation study of two different dipolar liquids (SPC/E water and a model Stockmayer fluid) confined to nanocavities of different ... More
Local constraints on the free edges of paper conesApr 11 2019While the shape equations describing the equilibrium of an unstretchable thin sheet that is free to bend are known, the boundary conditions that supplement these equations on free edges have remained elusive. Intuitively, unstretchability is captured ... More
Charge Transfer as a Ubiquitous Mechanism in Determining the Negative Charge at Hydrophobic InterfacesApr 11 2019The origin of the apparent negative charge at hydrophobic-water interfaces has fueled one of the biggest debates in physical chemistry for several decades. The most common interpretation given to explain this observation is that negatively charged hydroxide ... More
Charge Transfer as a Ubiquitous Mechanism in Determining the Negative Charge at Hydrophobic InterfacesApr 11 2019Apr 12 2019The origin of the apparent negative charge at hydrophobic-water interfaces has fueled one of the biggest debates in physical chemistry for several decades. The most common interpretation given to explain this observation is that negatively charged hydroxide ... More
Topological defects and geometric memory across the nematic-smectic A liquid crystal phase transitionApr 11 2019We study transformations of self-organized defect arrays at the nematic-smectic A liquid crystal phase transition, and show that these defect configurations are correlated, or "remembered", across the phase transition. A thin film of thermotropic liquid ... More
Models of infiltration into homogeneous and fractal porous media with localized sourcesApr 10 2019We study a random walk infiltration (RWI) model, in homogeneous and in fractal media, with localized sources at their boundaries. The particles released at a source, which is maintained at a constant density, execute unbiased random walks over a lattice; ... More
Multifaceted design optimisation for superomniphobic surfacesApr 10 2019Superomniphobic textures are at the frontier of surface design for vast arrays of applications. Despite recent significant advances in fabrication methods for reentrant and doubly reentrant microstructures, design optimisation remains a major challenge. ... More
Elastic response of poly(ethylene glycol) polymer chains studied using dynamic atomic force microscopyApr 10 2019Stretching response of polymer chains under external force is crucial in understanding polymer dynamics under equilibrium and non-equilibrium conditions. Here we measure the elastic response of poly(ethylene glycol) using a lock-in based amplitude modulation-AFM ... More
Yielding and hardening of flexible fiber packings during triaxial compressionApr 10 2019This paper examines the mechanical response of flexible fiber packings subject to triaxial compression. Short fibers yield in a manner similar to typical granular materials in which the deviatoric stress remains nearly constant with increasing strain ... More
Optimisation of hierarchical dielectric elastomer laminated compositesApr 09 2019This paper is concerned with the optimisation of the actuation response of electro-elastic, rank-two laminates obtained laminating a core rank-one composite with a soft phase which constitutes the shell. The analysis is performed for two classes of composites ... More
Twist-bend coupling, twist waves and DNA loopsApr 09 2019In vivo, DNA forms loops over a broad range of length scales: from several thousand base pairs (bp) down to about 100 bp. In loops shorter than the DNA persistence length (150 bp), thermal fluctuations can be neglected, and the molecule assumes approximately ... More
Reversible Formation of Thermoresponsive Binary Particle Gels with Tunable Structural and Mechanical PropertiesApr 09 2019We investigate the collective behavior of suspended thermoresponsive microgels, that expel solvent and subsequently decrease in size upon heating. Using a binary mixture of differently thermoresponsive microgels, we demonstrate how distinctly different ... More
Disarrangements and instabilities in 1D hyperelasticityApr 09 2019In the present work, the overall nonlinear elastic behavior of a 1D multi-modular structure incorporating possible imperfections at the discrete (micro-scale) level, is derived with respect to both tensile and compressive applied loads. The model is built ... More
Buckling Soft Tensegrities: Fickle Elasticity and Configurational Switching in Living CellsApr 09 2019Tensegrity structures are special architectures made by floating compressed struts kept together by a continuous system of tensed cables. The multiplicity of shapes that tensegrity structures can assume and their intrinsic capability to be deployable ... More
Tracking-free Determination of Microparticle Motion from Image VarianceApr 09 2019In this work, we use the standard deviation of image pixel intensity to analyse the speed, direction and surface-interaction of microparticles in fluid. First, we present an analytical model for estimating the total variance in the image space for directed ... More
Surfactant Mediated Particle Aggregation in Nonpolar SolventApr 09 2019Aggregation behavior of particles in nonpolar medium is studied with time-resolved light scattering. At low concentrations of surfactant particles are weakly charged and suspensions are not stable. Suspensions get progressively more stable with increasing ... More
MolMod: An open access database of force fields for molecular simulations of fluidsApr 09 2019The MolMod database is presented, which is openly accessible at and contains presently intermolecular force fields for over 150 pure fluids. It was developed and is maintained by the Boltzmann-Zuse Society for Computational ... More
Ideal isotropic auxetic networks from random networksApr 08 2019Auxetic materials are characterized by a negative Poisson's ratio, $\mathrm{\nu}$. As the Poisson's ratio becomes negative and approaches the lower isotropic mechanical limit of $\mathrm{\nu = -1}$, materials show enhanced resistance to impact and shear, ... More
A minimal G$\bar{\textrm{o}}$-model for rebuilding whole genome structures from haploid single-cell Hi-C dataApr 08 2019We present a minimal computational model, which allows very fast, on-the-fly construction of three dimensional haploid interphase genomes from single cell Hi-C contact maps using the HOOMD-blue molecular dynamics package on graphics processing units. ... More
Parallel three-dimensional simulations of quasi-static elastoplastic solids. Part II: Coordinate transformationsApr 08 2019In this two-part paper, we extend to three dimensions a new projection method for simulating hypo-elastoplastic solids in the quasi-static limit. The method is based on a surprising mathematical correspondence to the incompressible Navier-Stokes equations, ... More
Interparticle friction leads to non-monotonic flow curves and hysteresis in viscous suspensionsApr 08 2019Hysteresis is a major feature of the solid-liquid transition in granular materials. This property, by allowing metastable states, can potentially yield catastrophic phenomena such as earthquakes or aerial landslides. The origin of hysteresis in granular ... More
Superhydrophobic frictionsApr 08 2019Contrasting with its sluggish behavior on standard solids, water is extremely mobile on superhydrophobic materials, as shown for instance by the continuous acceleration of drops on tilted water-repellent leaves. For much longer substrates, however, drops ... More
Parallel three-dimensional simulations of quasi-static elastoplastic solids. Part I: Numerical formulation and examplesApr 08 2019In this two-part paper, we extend to three dimensions a new projection method for simulating hypo-elastoplastic solids in the quasi-static limit. The method is based on a surprising mathematical correspondence to the incompressible Navier-Stokes equations, ... More
Surface forces generated by the action of electric fields across liquid filmsApr 07 2019We explore the force generation and surface interactions arising when electric fields are applied across fluid films. Using a surface force balance (SFB) we measure directly the force between two electrodes in crossed-cylinder geometry across dielectric ... More
Dissipative Particle Dynamics for Systems with Polar SpeciesApr 07 2019In this work we developed a method for simulating polar species in the dissipative particle dynamics (DPD) method. The main idea behind the method is to treat each bead as a dumb-bell, i.e. two sub-beads (the sub-beads can bear charges) kept at a fixed ... More
Dissipative Particle Dynamics for Systems with Polar SpeciesApr 07 2019Apr 16 2019In this work we developed a method for simulating polar species in the dissipative particle dynamics (DPD) method. The main idea behind the method is to treat each bead as a dumb-bell, i.e. two sub-beads (the sub-beads can bear charges) kept at a fixed ... More
How crystals form: A theory of nucleation pathwaysApr 07 2019Recent advances in classical density functional theory are combined with stochastic process theory and rare event techniques to formulate a theoretical description of nucleation, including crystallization, that can predict nonclassical nucleation pathways ... More
Velocity jump in the crack propagation induced on a semi-crystalline polymer sheet by constant-speed stretchingApr 05 2019It has long been known for elastomers that the velocity of crack propagation jumps as a function of strain. On the other hand, such a jump has not been reported in the literature for polymers which do not exhibit a rubbery plateau in the storage-modulus ... More
Following in the footsteps of E. coli: sperm in microfluidic "strictures"Apr 05 2019We briefly describe the similarities of the experiments of sperm motion in microfluidic "strictures" by Zafeeani et al. in 2019 (Sci. Adv. 5, eaav21111, 2019) and those by Altshuler et al. in 2013 (Soft Matter 9, 1864, 2013). We shortly discuss the hydrodynamic ... More
Origami launcherApr 05 2019The article studies the elastic and locomotive properties of Miura-ori-type paper origami. The mechanics of a single paper crease is studied experimentally, and its non-elastic properties turn out to be crucial. The entire origami construction is then ... More
Force chains and networks: wet suspensions through dry granular eyesApr 05 2019Recent advances in shear-thickening suspension rheology suggest a relation between (wet) suspension flow below jamming and (dry) granular physics. To probe this connection, we simulated the contact force networks in suspensions of non-Brownian spheres ... More
Global Small-Angle Scattering Data Analysis of Inverted Hexagonal PhasesApr 05 2019We have developed a global analysis model for randomly oriented, fully hydrated inverted hexagonal (H$_\text{II}$) phases formed by many amphiphiles in aqueous solution, including membrane lipids. The model is based on a structure factor for hexagonally ... More
Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulenceApr 05 2019Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where suspensions of pusher bacteria at sufficient densities exhibit large-scale, ... More
Avalanche statistics during coarsening dynamicsApr 05 2019We study the coarsening dynamics of a two dimensional system via lattice Boltzmann numerical simulations. The system under consideration is a biphasic system consisting of domains of a dispersed phase closely packed together in a continuous phase and ... More
Microgels Adsorbed at Liquid-Liquid Interfaces: A Joint Numerical and Experimental StudyApr 05 2019Soft particles display highly versatile properties with respect to hard colloids, even more so at fluid-fluid interfaces. In particular, microgels, consisting of a cross-linked polymer network, are able to deform and flatten upon adsorption at the interface ... More
Cell motility, synchronization, and cell traction orientational orderApr 05 2019Suspensions of swimming micro-organisms provide examples of coordinated active dynamics. That has stimulated the study of a phenomenological theory combining synchronization and polar order in active matter. Here, we consider another example inspired ... More
Simulation of dense non-Brownian suspensions with lattice Boltzmann method: Shear jamming and fragileApr 05 2019Dense non-Brownian suspensions are numerically studied in terms of the lattice Boltzmann method to consider both the hydrodynamic and frictional contact interactions between particles. In addition to the simulation for bulk three-dimensional dense suspensions ... More
E. coli "super-contaminates" narrow ducts fostered by broad run-time distributionApr 04 2019One striking feature of bacterial motion is their ability to swim upstream along corners and crevices, by leveraging hydrodynamic interactions. This motion through anatomic ducts or medical devices might be at the origin of serious infections. However, ... More
Hydrodynamic Mobility Reversal of Squirmers near Flat and Curved SurfacesApr 04 2019Self-propelled particles have been experimentally shown to orbit spherical obstacles and move along surfaces. Here, we theoretically and numerically investigate this behavior for a hydrodynamic squirmer interacting with spherical objects and flat walls ... More
Probing the in-mouth texture perception with a biomimetic tongueApr 04 2019An experimental biomimetic tongue-palate system has been developed to probe human in-mouth texture perception. Model tongues are made from soft elastomers patterned with fibrillar structures analogue to human filiform papillae. The palate is represented ... More
On the connection between sliding friction and phonon lifetimes: Thermostat induced thermolubricity effects in molecular dynamics simulationsApr 04 2019A typical nanotribology simulation setup is the semi-infinite substrate, featuring a sliding bead on top, and with the lower substrate layers thermostatted to control temperature. A challenge is dealing with phonons that backreflect from the substrate ... More
Anomalous behavior of dispersion of longitudinal and transverse collective excitations in waterApr 04 2019We study the dependence of the excitation frequency of water along an isochore and an isotherm crossing the region of density anomaly. We have shown that the frequency of the longitudinal excitations demonstrated anomalous dependence on temperature along ... More
Effect of time and thermo-mechanical couplings on polymersApr 04 2019Analysis of the thermo-mechanical behaviour of polymers has been and still is the subject of many rheological studies both experimentally and theoretically. For small deformations, the modelling framework retained by rheologists is often of linear visco-elasticity, ... More
Stochastic Work Extraction in a colloidal heat engine in presence of colored noiseApr 04 2019From synthetic active devices such as self-propelling Janus colloids to micro-organisms like bacteria, micro-algae, living cells in tissues, active fluctuations are ubiquitous. Thermodynamics of small systems involving thermal as well as active fluctuations ... More
On the impact of controlled surface roughness shape on the slippage of a soft-materialApr 03 2019We explore how geometrical corrugations change the near-wall flow properties of soft-materials confined in microchannels. By means of numerical simulations, we perform a quantitative analysis of scaling laws that relate the wall slippage to the wall stress ... More
Nonmonotonic behavior in the dense assemblies of active colloidsApr 03 2019We study experimentally a sediment of self-propelled Brownian particles with densities ranging from dilute to ergodic supercooled to nonergodic glass. We observe a dramatic slowdown of relaxation of nonergodic states when particles become weakly self-propelled. ... More
Intermolecular distance and density scaling of dynamics in molecular liquidsApr 03 2019A broad variety of liquids conform to density scaling: relaxation times expressed as a function of the ratio of temperature to density, the latter raised to a material constant {\gamma}. For atomic liquids interacting only through simple pair potentials, ... More
Molecular Self-Organization of Three-Component Lipid MembranesApr 03 2019By constructing a Landau-like energy functional, we investigate the molecular organization of a three-component mixture in cell membranes. In the strongly interacting limit, we model the interaction between molecules using pseudospin variables and convert ... More
Concentrated suspensions of Brownian beads in water: dynamic heterogeneities trough a simple experimental techniqueApr 03 2019Concentrated suspensions of Brownian hard-spheres in water are an epitome for understanding the glassy dynamics of both soft materials and supercooled molecular liquids. From an experimental point of view, such systems are especially suited to perform ... More
Extension of the Hertz model for accounting to surface tension in nano-indentation tests of soft materialsApr 03 2019The contact between a spherical indenter and a solid is considered. A numerical finite element model (F. E. M) to taking into account the surface tension of the solid is presented and assessed. It is shown that for nano-indentation of soft materials, ... More
Focused Electron and X-ray Beam Crosslinking in Liquids for Nanoscale Hydrogels 3D Printing and EncapsulationApr 02 2019Additive fabrication of biocompatible 3D structures out of liquid hydrogel solutions has become pivotal technology for tissue engineering, soft robotics, biosensing, drug delivery, etc. Electron and X-ray lithography are well suited to pattern nanoscopic ... More
Stability of the interface of an isotropic active fluidApr 02 2019We study the linear stability of an isotropic active fluid in three different geometries: a film of active fluid on a rigid substrate, a cylindrical thread of fluid, and a spherical fluid droplet. The active fluid is modeled by the hydrodynamic theory ... More
Controlled self-aggregation of polymer-based nanoparticles employing shear flow and magnetic fieldsApr 02 2019Star polymers with magnetically functionalized end groups are presented as a novel polymeric system whose morphology, self-aggregation, and orientation can easily be tuned by exposing these macromolecules simultaneously to an external magnetic field and ... More
Solid PropellantsApr 02 2019Solid propellants are energetic materials used to launch and propel rockets and missiles. Although their history dates to the use of black powder more than two millennia ago, greater performance demands and the need for "insensitive munitions" that are ... More
Comment on "Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics"Apr 02 2019Recently Sanz et al. [A. Sanz, T. Hecksher, H.W. Hansen, J.C. Dyre, K. Niss, and U.R. Pedersen, Phys. Rev. Lett. 122, 055501 (2019).] reported that the scaling exponent gamma for tetramethyl-tetraphenyl-trisiloxane (DC704) varied with temperature; i.e., ... More
Oscillations of small bubbles and medium yielding in elastoviscoplastic fluidsApr 02 2019We investigate the radial oscillations of small gas bubbles trapped in yield-stress fluid and driven by an acoustic pressure field. We model the rheological behavior of the yield-stress fluid using the recently developed elasto-visco-plastic (EVP) constitutive ... More
The N-flagella problem: Elastohydrodynamic motility transition of multi-flagellated bacteriaApr 02 2019Peritrichous bacteria such as Escherichia coli swim in viscous fluids by forming a helical bundle of flagellar filaments. The filaments are spatially distributed around the cell body to which they are connected via a flexible hook. To understand how the ... More
Active Field TheoriesApr 02 2019Lecture Notes for Les Houches 2018 Summer School on Active Matter and Nonequilibrium Statistical Physics. These notes give an introduction to statistical field theories of active matter. After showing an example of how such theories can be created bottom-up ... More
Criticality at finite strain rate in fluidized soft glassy materialsApr 02 2019We study the emergence of critical dynamics in the steady shear rheology of fluidized soft glassy materials. Within a mesoscale elasto-plastic model accounting for a shear band instability, we show how an additional noise can induce a transition from ... More
The Role of Ionization in Thermal Transport of Solid PolyelectrolytesApr 01 2019Amorphous polymers are known as thermal insulators, increasing their thermal conductivities have not been guided by fully understood physics. In this work, we use molecular dynamics simulations to study the thermal transport mechanism of solid polyelectrolytes, ... More
Thermodynamic Approach to the Self-Diffusiophoresis of Colloidal Janus ParticlesApr 01 2019Most available theoretical predictions for the self-diffusiophoretic motion of colloidal particles are based on the hydrodynamic thin boundary layer approximation in combination with a solvent body force due to a self-generated local solute gradient. ... More