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1.0

Jun 30, 2018
06/18

by
Georgios G. Vogiatzis; Doros N. Theodorou

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The structural features of polystyrene brushes grafted on spherical silica nanoparticles immersed in polystyrene are investigated by means of a Monte Carlo methodology based on polymer mean field theory. The nanoparticle radii (either 8 nm or 13 nm) are held constant, while the grafting density and the lengths of grafted and matrix chains are varied systematically in a series of simulations. The primary objective of this work is to simulate realistic nanocomposite systems of specific chemistry...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.4001

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1.0

Jun 30, 2018
06/18

by
Jiajia Zhou; Friederike Schmid

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We briefly review recent theoretical and simulation studies of charged colloidal dispersions in alternating electric fields (AC fields). The response of single colloid to an external field can be characterized by a complex polarizability, which describes the dielectric properties of the colloid and its surrounding electrical double layer. We present computer simulation studies of single spherical colloid, using a coarse-grained mesoscale approach that accounts in full for hydrodynamic and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.0907

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2.0

Jun 30, 2018
06/18

by
Michele Scaraggi; Bo N. J. Persson

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We present exact numerical results for the friction force and the contact area for a viscoelastic solid (rubber) in sliding contact with hard, randomly rough substrates. The rough surfaces are self-affine fractal with roughness over several decades in length scales. We calculate the contribution to the friction from the pulsating deformations induced by the substrate asperities. We also calculate how the area of real contact, $A(v,p) $, depends on the sliding speed $v$ and on the nominal...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1406.7236

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0.0

Jun 30, 2018
06/18

by
Hong T. Nguyen; Tyler B. Smith; Robert S. Hoy; Nikos Ch. Karayiannis

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We map out the solid-state morphologies formed by model soft-pearl-necklace polymers as a function of bending stiffness $k_b$ spanning the range from fully flexible to rodlike chains. The ratio of Kuhn length to bead diameter ($l_K/r_0$) increases monotonically with increasing $k_b$ and yields a one-parameter model that relates chain shape to bulk morphology and yields insights into the packing of anisotropic particles. In the flexible limit, monomers occupy the sites of close-packed...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1406.1783

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1.0

Jun 30, 2018
06/18

by
V. M. O. Batista; M. L. Blow; M. M. Telo da Gama

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Understanding the flow of liquid crystals in microfluidic environments plays an important role in many fields, including device design and microbiology. We perform hybrid lattice-Boltzmann simulations of a nematic liquid crystal flowing under an applied pressure gradient in two-dimensional channels with various anchoring boundary conditions at the substrate walls. We investigate the relation between flow rate and pressure gradient and the corresponding profile of the nematic director, and find...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.4625

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0.0

Jun 30, 2018
06/18

by
M. Trulsson; M. Bouzid; J. Kurchan; E. Clement; P. Claudin; B. Andreotti

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The rheology of dense Brownian suspensions of hard spheres is investigated numerically beyond the low shear rate Newtonian regime. We analyze an athermal analogue of these suspensions, with an effective logarithmic repulsive potential representing the vibrational entropic forces. We show that both systems present the same rheology without adjustable parameters. Moreover, all rheological responses display similar Herschel-Bulkley relations once the shear stress and the shear rate are...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.7781

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0.0

Jun 30, 2018
06/18

by
Rituparno Mandal; Pranab Jyoti Bhuyan; Madan Rao; Chandan Dasgupta

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Dense soft glasses show strong collective caging behavior at sufficiently low temperatures. Using molecular dynamics simulations of a model glass former, we show that the incorporation of activity or self-propulsion, f0, can induce cage breaking and fluidization, resulting in a disappearance of the glassy phase beyond a critical f0 . The diffusion coefficient crosses over from being strongly to weakly temperature dependent as f0 is increased. In addition, we demonstrate that activity induces a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.1631

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0.0

Jun 30, 2018
06/18

by
Adeline Pons; Axelle Amon; Thierry Darnige; Jérôme Crassous; Eric Clément

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We propose a dynamical mechanism leading to the fluidization of soft-glassy amorphous mate-rial driven below the yield-stress by external mechanical fluctuations. The model is based on the combination of memory effect and non-linearity, leading to an accumulation of tiny effects over a long-term. We test this scenario on a granular packing driven mechanically below the Coulomb threshold. We bring evidences for an effective viscous response directly related to small stress modulations in...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.3288

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1.0

Jun 30, 2018
06/18

by
O. V. Manyuhina; M. J. Bowick

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Composed of square particles, the tetratic phase is characterised by a four-fold symmetry with quasi-long-range orientational order but no translational order. We construct the elastic free energy for tetratics and find a closed form solution for 1/4-disclinations in planar geometry. Applying the same covariant formalism to a sphere we show analytically that within the one elastic constant approximation eight +1/4-disclinations favor positions defining the vertices of a cube. The interplay...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.3521

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0.0

Jun 30, 2018
06/18

by
N. G. Almarza; J. Pekalski; A. Ciach

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The triangular lattice model with nearest-neighbor attraction and third-neighbor repulsion, introduced in [J. Pekalski, A. Ciach and N. G. Almarza, arXiv:1401.0801 [cond-mat.soft]] is studied by Monte Carlo simulation. Introduction of appropriate order parameters allowed us to construct a phase diagram, where different phases with patterns made of clusters, bubbles or stripes are thermodynamically stable. We observe, in particular, two distinct lamellar phases - the less ordered one with global...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.6466

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Jun 30, 2018
06/18

by
Mehdi Karzar-Jeddi; Remco Tuinier; Takashi Taniguchi; Tai-Hsi Fan

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A quantitative analysis is presented for the stochastic interactions of a pair of Brownian hard spheres in non-adsorbing polymer solutions. The hard spheres are hypothetically trapped by optical tweezers and allowed for random motion near the trapped positions. The investigation focuses on the long-time correlated Brownian motion. The mobility tensor altered by the polymer depletion effect is computed by the boundary integral method, and the corresponding random displacement is determined by...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.8013

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Jun 30, 2018
06/18

by
A. P. F. Atman; P. Claudin; G. Combe; G. H. B. Martins

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We investigate the mechanical properties of inclined frictional granular layers prepared with different protocols by means of DEM numerical simulations. We perform an orthotropic elastic analysis of the stress response to a localized overload at the layer surface for several substrate tilt angles. The distance to the unjamming transition is controlled by the tilt angle $\alpha$ with respect to the critical angle $\alpha_c$. We find that the shear modulus of the system decreases with $\alpha$,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.8100

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Jun 30, 2018
06/18

by
Peter H. Colberg; Raymond Kapral

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Like their larger micron-scale counterparts, {\AA}ngstr\"om-scale chemically self-propelled motors use asymmetric catalytic activity to produce self-generated concentration gradients that lead to directed motion. Unlike their micron-scale counterparts, the sizes of {\AA}ngstr\"om-scale motors are comparable to the solvent molecules in which they move, they are dominated by fluctuations, and they operate on very different time scales. These new features are studied using molecular...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.3577

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Jun 30, 2018
06/18

by
M. D. Tomchenko

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We analyze the possible expansions of the interatomic potential U(|\textbf{r}_{1}-\textbf{r}_{2}|) in a Fourier series for a cyclic system and a system with boundaries. We study also the transition from exact expansions for a finite system to the expansion that is usually used in the thermodynamic limit. The analysis indicates that such transition distorts the potential of a system with boundaries, by making it cyclic.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.8014

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0.0

Jun 30, 2018
06/18

by
Tamio Yamazaki

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The breakdown of the time-temperature superposition (TTS) near its glass transition temperature (Tg) in simple bead-spring polymer melts with and without the chain angle potential was numerically investigated. The stress relaxation modulus at different temperatures G(t,T) was calculated by the Green-Kubo relation. The TTS of G(t,T) of bead-spring polymer melts worked well at temperatures sufficiently higher than its Tg. However, when the system temperature is approaching the glass transition...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1404.0767

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0.0

Jun 30, 2018
06/18

by
John W. Biddle; Vincent Holten; Mikhail A. Anisimov

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A popular hypothesis that explains the anomalies of supercooled water is the existence of a metastable liquid-liquid transition hidden below the line of homogeneous nucleation. If this transition exists and if it is terminated by a critical point, the addition of a solute should generate a line of liquid-liquid critical points emanating from the critical point of pure metastable water. We have analyzed thermodynamic consequences of this scenario. In particular, we consider the behavior of two...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1404.2627

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0.0

Jun 30, 2018
06/18

by
Giuseppe D'Adamo; Andrea Pelissetto; Carlo Pierleoni

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The surface tension, the adsorption, and the depletion thickness of polymers close to a single nonadsorbing colloidal sphere are computed by means of Monte Carlo simulations. We consider polymers under good-solvent conditions and in the thermal crossover region between good-solvent and $\theta$ behavior. In the dilute regime we consider a wide range of values of $q$, from $q = 0$ (planar surface) up to $q\approx 30$-50, while in the semidilute regime, for $\rho_p/\rho_p^*\le 4$ ($\rho_p$ is the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.0978

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0.0

Jun 30, 2018
06/18

by
B. U. Felderhof

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A matrix formulation is derived for the calculation of the swimming speed and the power required for swimming of an assembly of rigid spheres immersed in a viscous fluid of infinite extent. The spheres may have arbitrary radii and may interact with elastic forces. The analysis is based on the Stokes mobility matrix of the set of spheres, defined in low Reynolds number hydrodynamics. For small amplitude swimming optimization of the swimming speed at given power leads to an eigenvalue problem....

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.1242

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0.0

Jun 30, 2018
06/18

by
Yachong Guo; Sergey Pogodin; Vladimir A. Baulin

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Coarse-grained model for saturated (DCPC, DLPC, DMPC, DPPC, DSPC) and unsaturated (POPC, DOPC) phospholipids is introduced within the Single Chain Mean Field theory. A single set of parameters adjusted for DMPC bilayers gives an adequate description of equilibrium and mechanical properties of a range of saturated lipid molecules that differ only in length of their hydrophobic tails and unsaturated (POPC, DOPC) phospholipids which have double bonds in the tails. A double bond is modeled with a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.4106

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0.0

Jun 30, 2018
06/18

by
Chuandong Lin; Aiguo Xu; Guangcai Zhang; Yingjun Li

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A 2-dimensional discrete Boltzmann model for combustion is presented. Mathematically, the model is composed of two coupled discrete Boltzmann equations for two species and a phenomenological equation for chemical reaction process. Physically, the model is equivalent to a reactive Navier-Stokes model supplemented by a coarse-grained model for the thermodynamic nonequilibrium behaviours. This model adopts 16 discrete velocities. It works for both subsonic and supersonic combustion phenomena with...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.5500

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0.0

Jun 30, 2018
06/18

by
Akira Furukawa; Davide Marenduzzo; Michael E Cates

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Using a fluid-particle dynamics approach, we numerically study the effects of hydrodynamic interactions on the collective dynamics of active suspensions within a simple model for bacterial motility: each microorganism is modeled as a stroke-averaged dumbbell swimmer with prescribed dipolar force pairs. Using both simulations and qualitative arguments, we show that, when the separation between swimmers is comparable to their size, the swimmers' motions are strongly affected by activity-induced...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.1314

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0.0

Jun 30, 2018
06/18

by
A. Taschin; P. Bartolini; A. Marcelli; R. Righini; R. Torre

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Using heterodyne-detected optical Kerr effect (HD-OKE) measurements, we investigate the vibrational dynamics and the structural relaxation of water nanoconfined in Vycor porous silica samples (pore size $\simeq~4~nm$ ) at different levels of hydration and temperatures. At low level of hydration, corresponding to two complete superficial water layers, no freezing occurs and water remains mobile at all the investigated temperatures with dynamic features similar, but not equal, to the bulk water....

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.1243

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Jun 30, 2018
06/18

by
Abram H. Clark; Alec J. Petersen; Lou Kondic; R. P. Behringer

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We experimentally study nonlinear force propagation into granular material during impact from an intruder, and we explain our observations in terms of the nonlinear grain-scale force relation. Using high-speed video and photoelastic particles, we determine the speed and spatial structure of the force response just after impact. We show that these quantities depend on a dimensionless parameter, $M'=t_c v_0/d$, where $v_0$ is the intruder speed at impact, $d$ is the particle diameter, and $t_c$...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.1971

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0.0

Jun 30, 2018
06/18

by
K. Haydukivska; V. Blavatska

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We analyze the universal size characteristics of flexible ring polymers in solutions in presence of structural obstacles (impurities) in d dimensions. One encounters such situations when considering polymers in gels, colloidal solutions, intra- and extracellular environments. A special case of extended impurities correlated on large distances r according to a power law \sim r^{-a} is considered. Applying the direct polymer renormalization scheme, we evaluate the estimates for averaged gyration...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.4629

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Jun 30, 2018
06/18

by
Remi Dreyfus; Ye Xu; Tim Still; Lawrence A. Hough; A. G. Yodh; Salvatore Torquato

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Hyperuniformity characterizes a state of matter for which density fluctuations diminish towards zero at the largest length scales. However, the task of determining whether or not an experimental system is hyperuniform is experimentally challenging due to finite-resolution, noise and sample-size effects that influence characterization measurements. Here we explore these issues, employing video optical microscopy to study hyperuniformity phenomena in disordered two-dimensional jammed packings of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.4645

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0.0

Jun 30, 2018
06/18

by
V. Gdovinová; N. Tomašovičová; N. Éber; T. Tóth-Katona; V. Závišová; M. Timko; P. Kopčanský

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The influence of the shape anisotropy of magnetic particles on the isotropic-nematic phase transition was studied in ferronematics based on the nematic liquid crystal 4-(trans-4-n-hexylcyclohexyl)-isothiocyanato-benzene (6CHBT). The liquid crystal was doped with spherical or rod-like magnetic particles of different size and volume concentrations. The phase transition from isotropic to nematic phase was observed by polarizing microscope as well as by capacitance measurements. The influence of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.1738

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0.0

Jun 30, 2018
06/18

by
Daniel Salgado-Blanco; Carlos I. Mendoza

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A major goal in nanoscience and nanotechnology is the self-assembly of any desired complex structure with a system of particles interacting through simple potentials. To achieve this objective, intense experimental and theoretical efforts are currently concentrated in the development of the so called "patchy" particles. Here we follow a completely different approach and introduce a very accessible model to produce a large variety of pre-programmed two-dimensional (2D) complex...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2916

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0.0

Jun 30, 2018
06/18

by
Chandan K Mishra; Rajesh Ganapathy

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We examine the role of shape of dynamical heterogeneities on the validity of the Stokes-Einstein (SE) and Stokes-Einstein-Debye (SED) relations in quasi-two-dimensional suspensions of colloidal ellipsoids. For ellipsoids with repulsive interactions, although the orientational relaxation time remains coupled to the structural one, the SED relation by the Einstein formalism shows a breakdown. Strikingly, we find that it is the change in the shape of the dynamical heterogeneities from string-like...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.8050

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1.0

Jun 30, 2018
06/18

by
Ting Ge; Gary S. Grest; Mark O. Robbins

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Large-scale molecular simulations are performed to investigate tensile failure of polymer interfaces as a function of welding time $t$. Changes in the tensile stress, mode of failure and interfacial fracture energy $G_I$ are correlated to changes in the interfacial entanglements as determined from Primitive Path Analysis. Bulk polymers fail through craze formation, followed by craze breakdown through chain scission. At small $t$ welded interfaces are not strong enough to support craze formation...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.1917

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0.0

Jun 30, 2018
06/18

by
K. V. Ramesh; R. Thaokar; J. Ravi Prakash; R. Prabhakar

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The dynamics of adhesion of a spherical micro-particle to a ligand-coated wall, in shear flow, is studied using a Langevin equation that accounts for thermal fluctuations, hydrodynamic interactions and adhesive interactions. Contrary to the conventional assumption that thermal fluctuations play a negligible role at high P$\acute{e}$clet numbers, we find that for particles with low surface densities of receptors, rotational diffusion caused by fluctuations about the flow and gradient directions...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.2775

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0.0

Jun 30, 2018
06/18

by
Farnoush Farahpour; Fathollah Varnik; Mohammad Reza Ejtehadi

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Stretching dynamics of polymers in microfluidics is of particular interest for polymer scientists. As a charged polymer, a polyelectrolyte can be deformed from its coiled equilibrium configuration to an extended chain by applying uniform or non-uniform electric fields. By means of hybrid lattice Boltzmann-molecular dynamics simulations, we investigate how the condensed counterions around the polyelectrolyte contribute to the polymer stretching in inhomogeneous fields. As an application, we...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.4293

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Jun 30, 2018
06/18

by
Lu Yao; Nima Sharifi-Mood; Iris B. Liu; Kathleen J. Stebe

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The capillary energy landscape for particles on curved fluid interfaces is strongly influenced by the particle wetting conditions. Contact line pinning has now been widely reported for colloidal particles, but its implications in capillary interactions have not been addressed. Here, we present experiment and analysis for disks with pinned contact lines on curved fluid interfaces. In experiment, we study microdisk migration on a host interface with zero mean curvature; the microdisks have...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.7226

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0.0

Jun 30, 2018
06/18

by
Koh M. Nakagawa; Hiroshi Noguchi

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Shape transformations of amphiphilic molecular assemblies induced by chemical reaction are studied using coarse-grained molecular simulations. A binding reaction between hydrophilic and hydrophobic molecules is considered. It is found that the reaction induces transformation of an oil droplet to a tubular vesicle via bicelles and vesicles with discoidal arms. The discoidal arms close into vesicles, which are subsequently fused into the tubular vesicle. Under the chemical reaction, the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.5750

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Jun 30, 2018
06/18

by
Tobias Horn; Hartmut Löwen

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When exposed to strong shearing, the particles in a crystal will rearrange and ultimately, the crystal will break by forming large nonaffine defects. Even for the initial stage of this process, only little effort has been devoted to the understanding of the breaking process on the scale of the individual particle size for thermalized mixed crystals. Here, we explore the shear-induced breaking for an equimolar two-dimensional binary model crystal with a high interaction asymmetry between the two...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.5830

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Jun 30, 2018
06/18

by
Jeevanjyoti Chakraborty; Colin P. Please; Alain Goriely; S. Jonathan Chapman

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Volumetric expansion of silicon anode particles in a lithium-ion battery during charging may lead to the generation of undesirable internal stresses. For a cylindrical particle such growth may also lead to failure by buckling if the expansion is constrained in the axial direction due to other particles or supporting structures. To mitigate this problem, the possibility of reducing axial growth is investigated theoretically by studying simple modifications of the solid cylinder geometry. First,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.6536

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Jun 30, 2018
06/18

by
Cristiano Nisoli; Alexander V. Balatsky

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The low-energy physics of (quasi)degenerate one-dimensional systems is typically understood as the particle-like dynamics of kinks between stable, ordered structures. Such dynamics, we show, becomes highly non-trivial when the ground states are topologically constrained: a dynamics of the domains rather than on the domains which the kinks separate. Motivated by recently reported observations of charged polymers physisorbed on nanotubes, we study kinks between helical structures of a string...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.7094

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Jun 30, 2018
06/18

by
V. I. Sultanov; V. V. Atrazhev; D. V. Dmitriev; S. F. Burlatsky

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The mobility of polymer chains in perfect polyethylene (PE) crystal was calculated as a function of temperature and chain length through Molecular dynamics (MD) in united atom approximation. The results demonstrate that the chain mobility drastically increases in the vicinity of the phase transition from the orthorhombic to quasi-hexagonal phase. In the quasi-hexagonal phase, the chain mobility is almost independent on temperature and inversely proportional to the chain length.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.4295

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Jun 30, 2018
06/18

by
Andrey Milchev; Kurt Binder

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Using a coarse-grained bead-spring model for semi-flexible macromolecules forming a polymer brush, structure and dynamics of the polymers is investigated, varying chain stiffness and grafting density. The anchoring condition for the grafted chains is chosen such that their first bonds are oriented along the normal to the substrate plane. Compression of such a semi-flexible brush by a planar piston is observed to be a two-stage process: for small compressions the chains contract by...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.6866

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Jun 30, 2018
06/18

by
E. DeGiuli; E. Lerner; C. Brito; M. Wyart

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We study theoretically and numerically the elastic properties of hard sphere glasses, and provide a real-space description of their mechanical stability. In contrast to repulsive particles at zero-temperature, we argue that the presence of certain pairs of particles interacting with a small force $f$ soften elastic properties. This softening affects the exponents characterizing elasticity at high pressure, leading to experimentally testable predictions. Denoting $P(f)\sim f^{\theta_e}$ the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.3834

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Jun 30, 2018
06/18

by
Achille Giacometti; Christoph Gogelein; Fred Lado; Francesco Sciortino; Silvano Ferrari; Giorgio Pastore

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Building upon past work on the phase diagram of Janus fluids [Sciortino et al., Phys. Rev. Lett. \textbf{103}, 237801 (2009)], we perform a detailed study of integral equation theory of the Kern-Frenkel potential with coverage that is tuned from the isotropic square-well fluid to the Janus limit. An improved algorithm for the reference hypernetted-chain (RHNC) equation for this problem is implemented that significantly extends the range of applicability of RHNC. Results for both structure and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.4582

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Jun 30, 2018
06/18

by
Ingrid Ibagon; Markus Bier; S. Dietrich

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For wetting films in dilute electrolyte solutions close to charged walls we present analytic expressions for their effective interface potentials. The analysis of these expressions renders the conditions under which corresponding wetting transitions can be first- or second-order. Within mean field theory we consider two models, one with short- and one with long-ranged solvent-solvent and solvent-wall interactions. The analytic results reveal in a transparent way that wetting transitions in...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.6527

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Jun 30, 2018
06/18

by
S. Sokołowski; J. Ilnytskyi; O. Pizio

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Many objects of nanoscopic dimensions involve fluid-tethered chain interfaces. These systems are of interest for basic science and for several applications, in particular for design of nanodevices for specific purposes. We review recent developments of theoretical methods in this area of research and in particular of density functional (DF) approaches, which provide important insights into microscopic properties of such interfaces. The theories permit to describe the dependence of adsorption,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.1491

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Jun 30, 2018
06/18

by
Hu Zheng; Joshua A. Dijksman; Robert P. Behringer

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Jammed states of frictional granular systems can be induced by shear strain at densities below the isostatic jamming density ($\phi_c$). It remains unclear, however, how much friction affects this so-called shear-jamming. Friction appears in two ways in this type of experiment: friction between particles, and friction between particles and the base on which they rest. Here, we study how particle-bottom friction, or basal friction, affects shear jamming in quasi-two dimensional experiments. In...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1404.7355

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Jun 30, 2018
06/18

by
Yu. D. Fomin; B. A. Klumov; V. N. Ryzhov; E. N. Tsiok

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Some fluids are known to behave anomalously. The so-called structural anomaly which means that the fluid becomes less structures under isothermal compression is among the most frequently discussed ones. Several methods for quantifying the degree of structural order are described in the literature and are used for calculating the regions of structural anomalies. It is implied that all of the structural order determinations yield qualitatively identical results. However, no explicit comparison...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1406.0356

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Jun 30, 2018
06/18

by
Jayson Paulose; Bryan Gin-ge Chen; Vincenzo Vitelli

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Mechanical metamaterials are artificial structures with unusual properties, such as negative Poisson ratio, bistability or tunable vibrational properties, that originate in the geometry of their unit cell. At the heart of such unusual behaviour is often a soft mode: a motion that does not significantly stretch or compress the links between constituent elements. When activated by motors or external fields, soft modes become the building blocks of robots and smart materials. Here, we demonstrate...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1406.3323

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Jun 30, 2018
06/18

by
Oleg A. Vasilyev; Boris A. Klumov; Alexei V. Tkachenko

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We study the structural and thermodynamic properties of patchy particle liquids, with a special focus on the role of "color", i.e. specific interactions between individual patches. A possible experimental realization of such "chromatic" interactions is by decorating the particle patches with single-stranded DNA linkers. The complementarity of the linkers can promote selective bond formation between predetermined pairs of patches. By using MD simulations, we compare the local...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.0405

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Jun 30, 2018
06/18

by
Alina Ciach; Jakub Pękalski

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A lattice model for binary mixture of lipids and water is introduced and investigated. The orientational degrees of freedom of the amphiphilic molecules are taken into account in the same way as in the model for oil-water-surfactant mixtures introduced earlier by Johan H\o ye and co-authors. The ground state of the model is discussed in detail, and the mean-field stability analysis of the disordered phase is performed. The model is compared to the recently introduced lattice model for colloidal...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.0816

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Jun 30, 2018
06/18

by
L. Comez; S. Corezzi; D. Fioretto; H. Kriegs; A. Best; W. Steffen

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We study the slow dynamics of salol by varying both temperature and pressure using photon correlation spectroscopy and pressure-volume-temperature measurements, and compare the behavior of the structural relaxation time with equations derived within the Adam-Gibbs entropy theory and the Cohen-Grest free volume theory. We find that pressure dependent data are crucial to assess the validity of these model equations. Our analysis supports the entropy-based equation, and estimates the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.3607

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Jun 30, 2018
06/18

by
L. E. Sanchez Diaz; E. C. Cortes-Morales; X. Li; Wei-Ren Chen; M. Medina-Noyola

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In this paper we develop statistical mechanical tools to describe the intermediate- and long-time collective- and self-diffusion properties of a liquid of strongly-interacting hollow spherical particles (shells), each bearing a smaller solid sphere (yolk) in its interior. To decouple two complex effects we assume that the hydrodynamic interactions can be accounted for through the effective short-time self-diffusion coefficients $D^0_s$ and $D^0_y$ that describe the short-time Brownian motion of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.6285

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Jun 30, 2018
06/18

by
Yimin Jiang; Mario Liu

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Granular solid hydrodynamics (GSH) is a continuum-mechanical theory for granular media, the range of which is shown in this paper. Simple, frequently analytic solutions are related to classic observations at different shear rates, including: (i)~static stress distribution, clogging; (ii)~elasto-plastic motion: loading and unloading, approach to the critical state, angle of stability and repose; (iii)~rapid dense flow: the $\mu$-rheology, Bagnold scaling and the stress minimum; (iv)~elastic...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.7219