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161

Apr 9, 2015
04/15

by
Isihara, A. (Akira)

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Originally published: New York : Oxford University Press, 1991

Topics: Condensed matter, Condensed matter, SCIENCE, Condensed matter

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339

Oct 23, 2009
10/09

by
Reader's Digest

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Contents : The Artist: The Shoes of the Fisherman. --The Moonflower Vine. --Florence Nightingale --The Wild Grapes: Summer selections.

Topics: Condensed books, Books, condensed

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179

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phisicks

Topic: condensed

1
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

2
2.0

Jun 25, 2018
06/18

by
Ioatzin Ríos de Anda; Antonia Statt; Francesco Turci; C. Patrick Royall

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Charged colloids can behave as Yukawa systems, with similar phase behaviour. Using particle- resolved studies, we consider a system with an unusually long Debye screening length which forms crystals at low colloid volume fraction {\phi} ~ 0.01. We quantitatively compare this system with the Yukawa model and find that its freezing point is compatible with the theoretical prediction but that the crystal polymorph is not always that expected. In particular we find body-centred cubic crystals where...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1501.01795

2
2.0

Jun 26, 2018
06/18

by
A. S. Bakai

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An overview of theoretical results and experimental data on the thermodynamics, structure and dynamics of the heterophase glass-forming liquids is presented. The theoretical approach is based on the mesoscopic heterophase fluctuations model (HPFM) developed within the framework of the bounded partition function approach. The Fischer cluster phenomenon, glass transition, liquid-liquid transformations, parametric phase diagram, cooperative dynamics and fragility of the glass-forming liquids is...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1501.02569

4
4.0

Jun 27, 2018
06/18

by
Joost de Graaf; Toni Peter; Lukas P. Fischer; Christian Holm

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The so-called 'raspberry' model refers to the hybrid lattice-Boltzmann (LB) and Langevin molecular dynamics scheme for simulating the dynamics of suspensions of colloidal particles, originally developed by [V. Lobaskin and B. D\"unweg, New J. Phys. 6, 54 (2004)], wherein discrete surface points are used to achieve fluid-particle coupling. In this paper, we present a follow up to our study of the effectiveness of the raspberry model in reproducing hydrodynamic interactions in the Stokes...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.02681

2
2.0

Jun 28, 2018
06/18

by
Seth Heerschap; John N. Marafino; Kristin McKenna; Kevin L. Caran; Klebert Feitosa

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The unique surface properties of amphiphilic molecules have made them widely used in applications where foaming, emulsifying or coating processes are needed. Novel surfactant architectures with multi-cephalic and multi-tailed molecules have reportedly enhanced their anti-bacterial activity in connection with tail length and the nature of the head group, but their ability to produce and stabilize foam is mostly unknown. Here we report on experiments with tris-cationic, triple-headed, double- and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.03672

2
2.0

Jun 27, 2018
06/18

by
V. A. Levashov; M. G. Stepanov

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Considerations of local atomic level stresses associated with each atom represent a particular approach to address structures of disordered materials at the atomic level. We studied structural correlations in a two-dimensional model liquid using molecular dynamics simulations in the following way. We diagonalized the atomic level stress tensors of every atom and investigated correlations between the eigenvalues and orientations of the eigenvectors of different atoms as a function of distance...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1504.05658

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4.0

Jun 28, 2018
06/18

by
Kai Jiang; Jiajun Tong; Pingwen Zhang

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In this article, we discuss the stability of soft quasicrystalline phases in a coupled-mode Swift-Hohenberg model for three-component systems, where the characteristic length scales are governed by the positive-definite gradient terms. Classic two-mode approximation method and direct numerical minimization are applied to the model. In the latter approach, we apply the projection method to deal with the potentially quasiperiodic ground states. A variable cell method of optimizing the shape and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.01766

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0.0

Jun 28, 2018
06/18

by
Ciro Semprebon; Mario Scheel; Stephan Herminghaus; Ralf Seemann; Martin Brinkmann

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Equilibrium shapes of coalesced pendular bridges in a static assembly of spherical beads are computed by numerical minimization of the interfacial energy. Our present study focuses on generic bead configurations involving three beads, one of which is in contact to the two others while there is a gap of variable size between the latter. In agreement with previous experimental studies, we find interfacial `trimer' morphologies consisting of three coalesced pendular bridges, and `dimers' of two...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1512.07668

2
2.0

Jun 27, 2018
06/18

by
Bao-quan Ai; Jian-chun Wu

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Rectified transport of active ellipsoidal particles is numerically investigated in a two-dimensional asymmetric potential. The out-of-equilibrium condition for the active particle is an intrinsic property, which can break thermodynamical equilibrium and induce the directed transport. It is found that the perfect sphere particle can facilitate the rectification, while the needlelike particle destroys the directed transport. There exist optimized values of the parameters (the self-propelled...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1505.02335

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8.0

Jun 28, 2018
06/18

by
S. Babuin; V. S. L'vov; A. Pomyalov; L. Skrbek; E. Varga

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We report complementary experimental, numerical and theoretical study of turbulent coflow, counterflow and pure superflow of superfluid He-4 in a channel, resulting in a physically transparent and relatively simple model of decaying quantum turbulence that accounts for interactions of coexisting quantum and classical components of turbulent superfluid He-. We further offer an analytical theory of the energy spectra of steady-state quantum turbulence in the counterflow and pure superflow, based...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1509.03765

2
2.0

Jun 29, 2018
06/18

by
David Salac

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Liposome vesicles tend to align with an applied magnetic field. This is due to the directional magnetic susceptibility difference of the lipids which form the membrane of these vesicles. In this work a model of liposome vesicles exposed to magnetic field is presented. Starting from the base energy of a lipid membrane in a magnetic field, the force applied to the surrounding fluids is derived. This force is then used to investigate the dynamics of vesicle in the presence of magnetic fields.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.05587

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1.0

Jun 27, 2018
06/18

by
B. M. Tanygin; S. I. Shulyma; V. F. Kovalenko; M. V. Petrychuk

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The phase transition between a massive dense phase and a diluted superparamagnetic phase has been studied by means of a direct molecular dynamics simulation. The equilibrium structures of the ferrofluid aggregate nucleus are obtained for different values of a temperature and an external magnetic field magnitude. An approximate match of experiment and simulation has been shown for the ferrofluid phase diagram coordinates "field-temperature". The provided phase coexistence curve has an...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.05854

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0.0

Jun 29, 2018
06/18

by
Prerna Gera; David Salac

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Phase separation and coarsening is a phenomenon commonly seen in binary physical and chemical systems that occur in nature. Often times, thermal fluctuations, modeled as stochastic noise, are present in the system and the phase segregation process occurs on a surface. In this work, the segregation process is modeled via the Cahn-Hilliard-Cook model, which is a fourth-order parabolic stochastic system. Coarsening is analyzed on two sample surfaces: a unit sphere and a dumbbell using a variety...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1605.07108

1
1.0

Jun 27, 2018
06/18

by
Simona Sennato; Laura Carlini; Domenico Truzzolillo; Federico Bordi

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The electrostatic complexation between DOTAP-DOPC unilamellar liposomes and an oppositely charged polyelectrolyte (NaPA) has been investigated in a wide range of the liposome surface charge density. We systematically characterized the "reentrant condensation" and the charge inversion of polyelectrolyte-decorated liposomes by means of dynamic light scattering and electrophoresis. We explored the stability of this model polyelectrolyte/colloid system by fixing each time the charge of...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.02847

1
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

2
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

0
0.0

Jun 29, 2018
06/18

by
S. N. Klimin; J. Tempere; J. T. Devreese

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In the present work, the problem of an all-coupling analytic description for the optical conductivity of the Froehlich polaron is treated, with the goal being to bridge the gap in validity range that exists between two complementary methods: on the one hand the memory function formalism and on the other hand the strong-coupling expansion based on the Franck-Condon picture for the polaron response. At intermediate coupling, both methods were found to fail as they do not reproduce Diagrammatic...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1606.00605

3
3.0

Jun 27, 2018
06/18

by
Ebrahim M. Kolahdouz; David Salac

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A numerical and systematic parameter study of three-dimensional vesicle electrohydrodynamics is presented to investigate the effects of different fluid and membrane properties. The dynamics of vesicles in the presence of DC electric fields is considered, both in the presence and absence of linear shear flow. For suspended vesicles it is shown that the conductivity ratio and viscosity ratio between the interior and exterior fluids, as well as the vesicle membrane capacitance, substantially...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.00763

4
4.0

Jun 28, 2018
06/18

by
Yi Liu; Jerzy Blawzdziewicz; Bogdan Cichocki; Jan K. G. Dhont; Maciej Lisicki; Eligiusz Wajnryb; Yuan-N. Young; Peter R. Lang

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In this article we report on a study of the near-wall dynamics of suspended colloidal hard spheres over a broad range of volume fractions. We present a thorough comparison of experimental data with predictions based on a virial approximation and simulation results. We find that the virial approach describes the experimental data reasonably well up to a volume fraction of $\phi=0.25$ which provides us with a fast and non-costly tool for the analysis and prediction of Evanescent Wave DLS data....

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.00479

2
2.0

Jun 27, 2018
06/18

by
M. H. Jensen; C. Alba-Simionesco; K. Niss; T. Hecksher

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Isothermal crystallization of the mono-hydroxyl alcohol n-butanol was studied with dielectric spectroscopy in real time. The crystallization was carried out using two different sample cells at 15 temperatures between 120 K and 134 K. For all temperatures, a shift in relaxation times to shorter times was observed during the crystallization process, which is characterized by a drop in relaxation strength. The two different sample environments induced quite different crystallization behaviors,...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1506.04385

3
3.0

Jun 26, 2018
06/18

by
Chien-Cheng Huang; Anoop Varghese; Gerhard Gompper; Roland G. Winkler

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Multiparticle collision dynamics (MPC), a particle-based mesoscale simulation technique for com- plex fluid, is widely employed in non-equilibrium simulations of soft matter systems. To maintain a defined thermodynamic state, thermalization of the fluid is often required for certain MPC variants. We investigate the influence of three thermostats on the non-equilibrium properties of a MPC fluid under shear or in Poiseuille flow. In all cases, the local velocities are scaled by a factor, which is...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1501.05734

3
3.0

Jun 26, 2018
06/18

by
Noy Cohen; Andreas Menzel; Gal deBotton

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Due to the increasing number of industrial applications of electro-active polymers (EAPs), there is a growing need for electromechanical models which accurately capture their behavior. To this end, we compare the predicted behavior of EAPs undergoing homogenous deformations according to three electromechanical models. The first model is a continuum based model composed of the mechanical Gent model and a linear relationship between the electric field and the polarization. The electrical and the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1502.01300

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3.0

Jun 27, 2018
06/18

by
Daniel M. Sussman; Samuel S. Schoenholz; Ye Xu; Tim Still; A. G. Yodh; Andrea J. Liu

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Recently there has been a surge in interest in using video-microscopy techniques to infer the local mechanical properties of disordered solids. One common approach is to minimize the difference between particle vibrational displacements in a local coarse-graining volume and the displacements that would result from a best-fit affine deformation. Effective moduli are then be inferred under the assumption that the components of this best-fit affine deformation tensor have a Boltzmann distribution....

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.07364

2
2.0

Jun 28, 2018
06/18

by
Ashkan Haji Hosseinloo; Konstantin Turitsyn

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Narrow bandwidth and easy detuning, inefficiency in broadband and non-stationary excitations, and difficulties in matching linear harvester's resonance frequency to low-frequency excitations at small scales, have convinced the researchers to investigate the nonlinear, in particular the bistable energy harvesters in the recent years. However, the bistable harvesters suffer from co-existing low and high energy orbits, and sensitivity to initial conditions, and have been recently proven...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1508.02126

2
2.0

Jun 28, 2018
06/18

by
Enrico Masoero; Falk K. Wittel; Hans J. Herrmann; B. M. Chiaia

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In this paper, we study the response of 2D framed structures made of rectangular cells, to the sudden removal of columns. We employ a simulation algorithm based on the Discrete Element Method, where the structural elements are represented by elasto-plastic Euler Bernoulli beams with elongation-rotation failure threshold. The effect of structural cell slenderness and of topological hierarchy on the dynamic residual strength after damage $\ROne$ is investigated. Topologically...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.01950

1
1.0

Jun 27, 2018
06/18

by
Doru Constantin

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We determine by small-angle x-ray scattering the structure factor of hydrophobic particles inserted within lamellar surfactant phases for various particle concentrations. The data are then analyzed by numerically solving the Ornstein-Zernicke equation, taking into account both the intra- and interlayer interactions. We find that particles within the same layer repel each other and that the interaction potential (taken as independent of the concentration) has a contact value of 2.2...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1504.01254

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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 27, 2018
06/18

by
Aniruddha Chakraborty

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The effective thermal diffusivity is evaluated for a two dimensional real solid and the real solid is modeled with periodic surface. The result contain the scale factor for the conformal transformation that flattens the surface. We find that the effective thermal diffusivity is always less than the local thermal diffusivity and this conclusion is independent of the model.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1505.07609

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5.0

Jun 28, 2018
06/18

by
Yi Peng; Lipeng Lai; Yi-Shu Tai; Kechun Zhang; Xinliang Xu; Xiang Cheng

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Active matter such as swarming bacteria and motile colloids exhibits exotic properties different from conventional equilibrium materials. Among these properties, the enhanced diffusion of tracer particles is generally deemed as a hallmark of active matter. Here, rather than spherical tracers, we investigate the diffusion of isolated ellipsoids in quasi-two-dimensional bacterial bath. Our study reveals a nonlinear enhancement of both translational and rotational diffusions. More importantly, we...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.05893

2
2.0

Jun 27, 2018
06/18

by
Jeremie Palacci; Stefano Sacanna; Anais Abrahmian; Jeremie Barral; Kasey Hanson; Alexander Y. Grosberg; David J. Pine; Paul M. Chaikin

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Motility is a basic feature of living microorganisms, and how it works is often determined by environmental cues. Recent efforts have focused on develop- ing artificial systems that can mimic microorganisms, and in particular their self-propulsion. Here, we report on the design and characterization of syn- thetic self-propelled particles that migrate upstream, known as positive rheo- taxis. This phenomenon results from a purely physical mechanism involving the interplay between the polarity of...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1505.05111

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3.0

Jun 27, 2018
06/18

by
Trond S. Ingebrigtsen; Hajime Tanaka

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Polydisperse fluids are encountered everywhere in biological and industrial processes. These fluids naturally show a rich phenomenology exhibiting fractionation and shifts in critical point and freezing temperatures. Here, we study the impact of size polydispersity on the basic nature of Lennard-Jones (LJ) liquids, which represent most molecular liquids without hydrogen bonds, via two- and three-dimensional molecular dynamics computer simulations. A single-component liquid constituting...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.02866

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2.0

Jun 28, 2018
06/18

by
Nanette N. Jarenwattananon; Louis-S. Bouchard

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The traditional view of nuclear-spin decoherence in a field gradient due to molecular self-diffusion is challenged on the basis of temperature dependence of the linewidth, which demonstrates different behaviors between liquids and gases. The conventional theory predicts that in a fluid, linewidth should increase with temperature; however, in gases we observed the opposite behavior. This surprising behavior can be explained using a more detailed theoretical description of the dephasing function...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1506.06331

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0.0

Jun 30, 2018
06/18

by
F. Puosi; O. Chulkin; S. Bernini; S. Capaccioli; D. Leporini

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We investigate by thorough Molecular Dynamics simulations the thermodynamic scaling (TS) of a polymer melt. Two distinct models, with strong and weak virial-energy correlations, are considered. Both evidence the joint TS with the same characteristic exponent $\gamma_{ts}$ of the fast mobility - the mean square amplitude of the picosecond rattling motion inside the cage -, and the much slower structural relaxation and chain reorientation. If the cage effect is appreciable, the TS master curves...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1701.02211

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3.0

Jun 26, 2018
06/18

by
Kuang-Wu Lee; Marco G. Mazza

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We introduce a new mesoscopic model for nematic liquid crystals (LCs). We extend the particle-based stochastic rotation dynamics method, which reproduces the Navier-Stokes equation, to anisotropic fluids by including a simplified Ericksen-Leslie formulation of nematodynamics. We verify the applicability of this hybrid model by studying the equilibrium isotropic-nematic phase transition and nonequilibrium problems, such as the dynamics of topological defects, and the rheology of sheared LCs. Our...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1502.03293

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2.0

Jun 26, 2018
06/18

by
H. A. Guidobaldi; Y. Jeyaram; C. A. Condat; M. Oviedo; I. Berdakin; V. V. Moshchalkov; L. C. Giojalas; A. V. Silhanek; V. I. Marconi

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Many self-propelled microorganisms are attracted to surfaces. This makes their dynamics in restricted geometries very different from that observed in the bulk. Swimming along walls is beneficial for directing and sorting cells, but may be detrimental if homogeneous populations are desired, such as in counting microchambers. In this work, we characterize the motion of human sperm cells $60 \mu m$ long, strongly confined to $25 \mu m$ shallow chambers. We investigate the nature of the cell...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1501.01508

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0.0

Jun 29, 2018
06/18

by
Anvy Moly Tom; Satyavani Vemparala; R Rajesh; Nikolai Brilliantov

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We perform extensive molecular dynamics simulations of a highly charged flexible polyelectrolyte (PE) chain in a poor solvent for the case when the chain is in a collapsed state and the electrostatic interactions, characterized by the reduced Bjerrum length $\ell_B$, are strong. We detect the existence of several sub-regimes, $R_g \sim \ell_B^{-\gamma}$, in the dependence of the gyration radius of the chain $R_g$ on $\ell_B$. In contrast to a good solvent, the exponent $\gamma$ for a poor...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.06486

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0.0

Jun 29, 2018
06/18

by
Bosi Mao; Thibaut Divoux; Patrick Snabre

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Hydrogels behave as viscoelastic soft solids and display a porous microstructure filled with water with typical amounts of 90\%~w/w or more. As such, these materials are highly sensitive to water loss through evaporation, which impacts their mechanical properties. Yet, aside from scattered empirical observations, little is known about the gel drying kinetics for which there is a lack of temporally and spatially resolved measurements. Here we report a benchmark study of the slow drying of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.09459

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0.0

Jun 29, 2018
06/18

by
Gary A. Williams

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The theory of "Adiabatic Fountain Resonance" with superfluid $^4$He is clarified. In this geometry a film region between two silicon wafers bonded at their outer edge opens up to a central region with a free surface. We find that the resonance in this system is not a Helmholtz resonance as claimed by Gasparini and co-workers, but in fact is a fourth sound resonance. We postulate that it occurs at relatively low frequency because the thin silicon wafers flex appreciably from the...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1612.08797

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0.0

Jun 30, 2018
06/18

by
Michael Niemetz; Risto Hänninen; Wilfried Schoepe

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The flow of superfluid $^4$He around a translationally oscillating sphere, levitating without mechanical support, can either be laminar or turbulent, depending on the velocity amplitude. Below a critical velocity $v_c$ that scales as $\omega ^{1/2}$, and is temperature independent below 1 K, the flow is laminar (potential flow). Below 0.5 K the linear drag force is caused by ballistic phonon scattering that vanishes as T$^4$ until background damping, measured in the empty cell, becomes dominant...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1701.05733

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0.0

Jun 30, 2018
06/18

by
M. Klopotek; H. Hansen-Goos; M. Dixit; T. Schilling; F. Schreiber; M. Oettel

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Growth of hard--rod monolayers via deposition is studied in a lattice model using rods with discrete orientations and in a continuum model with hard spherocylinders. The lattice model is treated with kinetic Monte Carlo simulations and dynamic density functional theory while the continuum model is studied by dynamic Monte Carlo simulations equivalent to diffusive dynamics. The evolution of nematic order (excess of upright particles, "standing--up" transition) is an entropic effect and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1701.05830

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0.0

Jun 30, 2018
06/18

by
Alessandro Lucantonio; Giovanni Noselli

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Brittle materials fail catastrophically. In consequence of their limited flaw-tolerance, failure occurs by localized fracture and is typically a dynamic process. Recently, experiments on epithelial cell monolayers have revealed that this scenario can be significantly modified when the material susceptible to cracking is adhered to a hydrogel substrate. Thanks to the hydraulic coupling between the brittle layer and the poroelastic substrate, such a composite can develop a toughening mechanism...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.01318

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Jun 30, 2018
06/18

by
Élfego Ruiz-Gutiérrez; Ciro Semprebon; Glen McHale; Rodrigo Ledesma-Aguilar

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We present a theoretical study of the statics and dynamics of a partially wetting liquid droplet, of equilibrium contact angle $\theta_{\rm e}$, confined in a solid wedge geometry of opening angle $\beta$. We focus on a mostly non-wetting regime, given by the condition $\theta_{\rm e} - \beta > 90^\circ$, where the droplet forms a liquid barrel -- a closed shape of positive mean curvature. Using a quasi-equilibrium assumption for the shape of the liquid-gas interface, we compute the surface...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.06076

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Jun 30, 2018
06/18

by
Kapil Jainwal; Mukul Sarkar; Kushal Shah

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Randomization of the trap state of defects present at the gate Si-SiO$_2$ interface of MOSFET is responsible for the low-frequency noise phenomena such as Random Telegraph Signal (RTS), burst, and 1/\textit{f} noise. In a previous work, theoretical modelling and analysis of the RTS noise in MOS transistor was presented and it was shown that this 1/\textit{f} noise can be reduced by decreasing the duty cycle ($f_{D}$) of switched biasing signal. In this paper, an extended analysis of this...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1704.00876

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Jun 30, 2018
06/18

by
Emil Prodan; Kyle Dobiszewski; Alokik Kanwal; John Palmieri; Camelia Prodan

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Mechanical systems can display topological characteristics similar to that of topological insulators. Here we report a large class of topological mechanical systems related to the BDI symmetry class. These are self-assembled chains of rigid bodies with an inversion center and no reflection planes. The particle-hole symmetry characteristic to the BDI symmetry class stems from the distinct behavior of the translational and rotational degrees of freedom under inversion. This and other generic...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.06542

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Jun 29, 2018
06/18

by
Wenwei Liu; Yuliang Jin; Sheng Chen; Hernán A. Makse; Shuiqing Li

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We systematically generate a large set of random micro-particle packings over a wide range of adhesion and friction by means of adhesive contact dynamics simulation. The ensemble of generated packings covers a range of volume fraction $\phi$ from $0.135 \pm 0.007$ to $0.639 \pm 0.004$, and of coordination number $Z$ from $2.11 \pm 0.03$ to $6.40 \pm 0.06$. We determine $\phi$ and $Z$ at four limits (random close packing, random loose packing, adhesive close packing, and adhesive loose packing),...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.05150

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Jun 29, 2018
06/18

by
Umberto Marini Bettolo Marconi; Matteo Paoluzzi; Claudio Maggi

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We investigate the steady state properties of an active fluid modeled as an assembly of soft repulsive spheres subjected to Gaussian colored noise. Such a noise captures one of the salient aspects of active particles, namely the persistence of their motion and determines a variety of novel features with respect to familiar passive fluids. We show that within the so-called multidimensional unified colored noise approximation, recently introduced in the field of active matter, the model can be...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.05617

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Jun 29, 2018
06/18

by
Francesco Alaimo; Simon Praetorius; Axel Voigt

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We introduce a mesocopic modeling approach for active systems. The continuum model allows to consider microscopic details as well as emerging macroscopic behavior and can be considered as a minimal continuum model to describe generic properties of active systems with isotropic agents. The model combines aspects from phase field crystal (PFC) models and Toner-Tu models. The results are validated by reproducing results obtained with corresponding agent-based microscopic models. We consider binary...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.06694