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European Physical Journal. E, Soft Matter

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https://www.readbyqxmd.com/read/28213759/convection-of-a-colloidal-suspension-in-a-hele-shaw-cell
#1
B L Smorodin, I N Cherepanov, S N Ishutov, B I Myznikova
The results of a theoretical study are presented dealing with convective heat and mass transfer in a colloidal suspension through a Hele-Shaw cell heated from below. The numerical analysis, based on a multi-component model, reveals that for a certain range of parameter values the dynamical regimes of travelling waves as well as oscillatory fingering formation are stable. The bifurcation phenomena and nonlinear evolution of spatiotemporal patterns that develop in the colloid suspension are modeled and discussed, paying special attention to the combined effects of gravity sedimentation, thermal diffusion with positive separation ratio and convection...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28210959/glass-transition-in-hard-core-fluids-and-beyond-using-an-effective-static-structure-in-the-mode-coupling-theory
#2
S Amokrane, F Tchangnwa Nya, J M Ndjaka
The dynamical arrest in classical fluids is studied using a simple modification of the mode coupling theory (MCT) aimed at correcting its overestimation of the tendency to glass formation while preserving its overall structure. As in previous attempts, the modification is based on the idea of tempering the static pair correlations used as input. It is implemented in this work by computing the static structure at a different state point than the one used to solve the MCT equation for the intermediate scattering function, using the pure hard-sphere glass for calibration...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28188556/onset-of-soret-induced-convection-in-a-horizontal-layer-of-ternary-fluid-with-fixed-vertical-heat-flux-at-the-boundaries
#3
T P Lyubimova, E S Sadilov, S A Prokopev
The paper deals with the investigation of the onset and weakly nonlinear regimes of the Soret-driven convection of ternary liquid mixture in a horizontal layer with rigid impermeable boundaries subjected to the prescribed constant vertical heat flux. It is found that there are monotonous and oscillatory longwave instability modes. The boundary of the monotonous longwave instability in the parameter plane Rayleigh number Ra - net separation ratio [Formula: see text] at fixed separation ratio of one of solutes consists of two branches of hyperbolic type...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28188555/curvature-effects-on-the-velocity-profile-in-turbulent-pipe-flow
#4
Siegfried Grossmann, Detlef Lohse
Prandtl and von Kármán have developed the famous log-law for the mean velocity profile for turbulent flow over a plate. The log-law has also been applied to turbulent pipe flow, though the wall surface is curved (in span-wise direction) and has finite diameter. Here we discuss the theoretical framework, based on the Navier-Stokes equations, with which one can describe curvature effects and also the well-known finite-size effects in the turbulent mean-velocity profile. When comparing with experimental data we confirm that the turbulent eddy viscosity must contain both curvature and finite-size contributions and that the usual ansatz for the turbulent eddy viscosity as being linear in the wall distance is insufficient, both for small and large wall distances...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28181056/non-equilibrium-concentration-fluctuations-in-superparamagnetic-nanocolloids
#5
Ana Oprisan, Ashley Rice, Sorinel A Oprisan, Cédric Giraudet, Fabrizio Croccolo
We investigate non-equilibrium concentration fluctuations during the free diffusion of a colloidal suspension against pure water. We investigate Fe2O3 superparamagnetic nanocolloids with sizes between 1 and 10 nm by means of a shadowgraph apparatus to determine the mixture mass diffusion coefficient and kinematic viscosity. The experiments were performed in three distinct conditions: Experiment 1 is without any magnetic field; Experiment 2 with a vertical magnetic field; Experiment 3 after turning off the magnetic field...
February 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28124767/dip-coating-in-the-presence-of-an-opposing-marangoni-stress
#6
Sumit Gupta, Naveen Tiwari
Theoretical analysis of the dip coating process of uniformly wetting and selectively wetting substrates with a shear-thinning power-law fluid is presented. The viscosity is modeled by a three-constant Ellis model that allows for Newtonian and power-law fluids at low and high shear, respectively. The effect of an opposing Marangoni stress is studied on the entrained film thickness. Ellis number and Marangoni number are the important parameters in the analysis that control the film thickness. Numerical results show that the film thickness is a monotonically decreasing function of these two parameters...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28124766/why-granular-media-are-thermal-and-quite-normal-after-all
#7
Yimin Jiang, Mario Liu
Two approaches exist to account for granular dynamics: The athermal one takes grains as elementary, the thermal one considers the total entropy that includes microscopic degrees of freedom such as phonons and electrons. Discrete element method (DEM), granular kinetic theory and athermal statistical mechanics (ASM) belong to the first, granular solid hydrodynamics (GSH) to the second one. A discussion of the conceptual differences between both is given here, leading, among others, to the following insights: 1) While DEM and granular kinetic theory are well justified to take grains as athermal, any entropic consideration is far less likely to succeed...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28124765/influence-of-fluorination-on-barrier-properties-of-polymers-insights-from-monte-carlo-simulations-of-eicosanes-methane
#8
Matthew Lasich, Deresh Ramjugernath
Fluorination is widely used to improve the resistance and physical properties of polymers that are cheap to manufacture. This process improves the resistance properties of unfluorinated materials. This study examines the effects of varying the degree of fluorination on the clustering and absorption behaviour of methane n-eicosane. Monte Carlo simulations were performed for several different pressure values, at ambient temperature, to determine the uptake of methane into the eicosanes. The density of the pure eicosanes, simulated at ambient conditions, compared favourably with experimental data for the relevant polymers...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28124764/magnetoconvection-transient-dynamics-by-numerical-simulation
#9
Sébastien Renaudière de Vaux, Rémi Zamansky, Wladimir Bergez, Philippe Tordjeman, Jean-François Haquet
We investigate the transient and stationary buoyant motion of the Rayleigh-Bénard instability when the fluid layer is subjected to a vertical, steady magnetic field. For Rayleigh number, Ra, in the range 10(3)-10(6), and Hartmann number, Ha, between 0 and 100, we performed three-dimensional direct numerical simulations. To predict the growth rate and the wavelength of the initial regime observed with the numerical simulations, we developed the linear stability analysis beyond marginal stability for this problem...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28124207/influence-of-grafting-on-the-glass-transition-temperature-of-ps-thin-films
#10
Marceau Hénot, Alexis Chennevière, Eric Drockenmuller, Kenneth Shull, Liliane Léger, Frédéric Restagno
We present an investigation of the effect of the interaction between a thin polystyrene film and its supporting substrate on its glass transition temperature ([Formula: see text]). We modulate this interaction by depositing the film on end-tethered polystyrene grafted layers of controlled molecular parameters. By comparing [Formula: see text] measurements versus film thickness for films deposited on different grafted layers and films deposited directly on a silicon substrate, we can conclude that there is no important effect of the film-subtrate interaction...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28116539/characteristics-of-melting-heat-transfer-during-flow-of-carreau-fluid-induced-by-a-stretching-cylinder
#11
Hashim, Masood Khan, Ali Saleh Alshomrani
This article provides a comprehensive analysis of the energy transportation by virtue of the melting process of high-temperature phase change materials. We have developed a two-dimensional model for the boundary layer flow of non-Newtonian Carreau fluid. It is assumed that flow is caused by stretching of a cylinder in the axial direction by means of a linear velocity. Adequate local similarity transformations are employed to determine a set of non-linear ordinary differential equations which govern the flow problem...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28108886/phase-behaviour-in-complementary-dna-coated-gold-nanoparticles-and-fd-viruses-mixtures-a-numerical-study
#12
Massimiliano Chiappini, Erika Eiser, Francesco Sciortino
A new gel-forming colloidal system based on a binary mixture of fd-viruses and gold nanoparticles functionalized with complementary DNA single strands has been recently introduced. Upon quenching below the DNA melt temperature, such a system results in a highly porous gel state, that may be developed in a new functional material of tunable porosity. In order to shed light on the gelation mechanism, we introduce a model closely mimicking the experimental one and we explore via Monte Carlo simulations its equilibrium phase diagram...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28097480/average-flow-generation-by-a-pulsating-flow-near-a-curved-interface
#13
Lyudmila S Klimenko, Dmitry V Lyubimov
This paper is devoted to the study of curvature influence on the average flow generation near the fluid interface. The time averaging of a non-uniform pulsating flow often results in a nonzero average flow in the bulk. The well-known average flow occurs near a solid surface, the so-called Schlichting mechanism of the average flow generation. For flows with a free surface there is the other known mechanism of Longuet-Higgins, according to which the average flow is generated by surface waves traveling on a free surface...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28097479/structural-and-cooperative-length-scales-in-polymer-gels
#14
Baudouin Géraud, Loren Jørgensen, Christophe Ybert, Hélène Delanoë-Ayari, Catherine Barentin
Understanding the relationship between the material structural details, the geometrical confining constraints, the local dynamical events and the global rheological response is at the core of present investigations on complex fluid properties. In the present article, this problem is addressed on a model yield stress fluid made of highly entangled polymer gels of Carbopol which follows at the macroscopic scale the well-known Herschel-Bulkley rheological law. First, performing local rheology measurements up to high shear rates ([Formula: see text] s(-1))and under confinement, we evidence unambiguously the breakdown of bulk rheology associated with cooperative processes under flow...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28091930/non-equilibrium-molecular-dynamics-simulations-of-the-transient-ludwig-soret-effect-in-a-binary-lennard-jones-spline-mixture
#15
Bjørn Hafskjold
A binary isotope mixture of Lennard-Jones/spline particles at equilibrium was perturbed by a sudden change in the system's boundary temperatures. The system's response was determined by non-equilibrium molecular dynamics (NEMD). Three transient processes were studied: 1) The propagation of a pressure (shock) wave, 2) heat diffusivity and conduction, and 3) thermal diffusion (the Ludwig-Soret effect). These three processes occur at different time scales, which makes it possible to separate them in one single NEMD run...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28083793/role-and-significance-of-wetting-pressures-during-droplet-impact-on-structured-superhydrophobic-surfaces
#16
Karthik Murugadoss, Purbarun Dhar, Sarit K Das
The impact dynamics and spreading behavior of droplets impinging on structured superhydrophobic surfaces are dependent on both the droplet initial conditions and the surface texture. The equivalence of wetting and dewetting pressures is classically known to be a critical factor in determining the state of a droplet during the contact and spreading phases. The present study extensively examines the underlying physics behind this pressure balance during the impact process and its direct role in determining the wetting process...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28083792/three-body-potential-for-simulating-bond-swaps-in-molecular-dynamics
#17
Francesco Sciortino
Novel soft matter materials join the resistance of a permanent mesh of strong inter-particle bonds with the self-healing and restructuring properties allowed by bond-swapping processes. Theoretical and numerical studies of the dynamics of coarse-grained models of covalent adaptable networks and vitrimers require effective algorithms for modelling the corresponding evolution of the network topology. Here I propose a simple trick for performing molecular dynamics simulations of bond-swapping network systems with particle-level description...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28083791/vertex-stability-and-topological-transitions-in-vertex-models-of-foams-and-epithelia
#18
Meryl A Spencer, Zahera Jabeen, David K Lubensky
In computer simulations of dry foams and of epithelial tissues, vertex models are often used to describe the shape and motion of individual cells. Although these models have been widely adopted, relatively little is known about their basic theoretical properties. For example, while fourfold vertices in real foams are always unstable, it remains unclear whether a simplified vertex model description has the same behavior. Here, we study vertex stability and the dynamics of T1 topological transitions in vertex models...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28012147/spatial-distribution-and-nematic-ordering-of-anisotropic-nanoparticles-in-lamellae-and-hexagonal-phases-of-block-copolymers
#19
Mikhail A Osipov, Maxim V Gorkunov
Orientational and translational ordering of anisotropic nanoparticles in the lamellae and hexagonal phases of diblock copolymers have been considered theoretically in the case of strong segregation taking into account the anisotropic interaction between the nanoparticles and the monomers in different blocks. It has been shown that anisotropic nanoparticles are orientationally ordered in the boundary region between the blocks and the nematic order parameter possesses opposite signs in different blocks: the nanoparticles align parallel to the boundary in one block and perpendicular to it in the other...
December 2016: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28012146/electrophoretic-mobility-of-a-monotopic-membrane-protein-inserted-into-the-top-of-supported-lipid-bilayers
#20
Frédéric Harb, Marie-Thérèse Giudici-Orticoni, Marianne Guiral, Bernard Tinland
We have studied the translational migration of a monotopic membrane protein, the bacterial sulfide quinone reductase (SQR) in supported n-bilayers ([Formula: see text]) under the influence of an electric field parallel to the membrane plane. The direction of the migration changes when the charge of the protein changes its sign. Measuring mobilities at different pH enables us to gain experimental physico-chemical data on SQR as its isoelectric point and its estimated oligomeric state (at least trimeric) when inserted in a lipid membrane...
December 2016: European Physical Journal. E, Soft Matter
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