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279
Apr 9, 2015
04/15
by
Isihara, A. (Akira)
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eye 279
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Originally published: New York : Oxford University Press, 1991
Topics: Condensed matter, Condensed matter, SCIENCE, Condensed matter
2
2.0
Jun 29, 2018
06/18
by
Abdullah Cakir; Massimo Pica Ciamarra
texts
eye 2
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We investigate the emergence of the continuum elastic limit from the atomistic description of matter at zero temperature considering how locally defined elastic quantities depend on the coarse graining length scale. Results obtained numerically investigating different model systems are rationalized in a unifying picture according to which the continuum elastic limit emerges through a process determined by two system properties, the degree of disorder, and a length scale associated to the...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1603.04676
4
4.0
Jun 28, 2018
06/18
by
L. Staron; J. C. Phillips
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eye 4
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When a granular mixture involving grains of different sizes is shaken, sheared, mixed, or left to flow, grains tend to separate by sizes in a process known as size segregation. In this study, we explore the size segregation mechanism in granular chute flows in terms of pressure distribution and granular micro-structure. Therefore, 2D discrete numerical simulations of bi-disperse granular chute flows are systematically analysed. Based on the theoretical models by Gray and Thornton 2005 and Hill...
Topics: Other Condensed Matter, Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1508.05871
3
3.0
Jun 27, 2018
06/18
by
Robert Großmann; Pawel Romanczuk; Markus Bär; Lutz Schimansky-Geier
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eye 3
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Recently, we proposed a self-propelled particle model with competing alignment interactions: nearby particles tend to align their velocities whereas they anti-align their direction of motion with particles which are further away [R. Grossmann et al., Phys. Rev. Lett. 113, 258104 (2014)]. Here, we extend our previous numerical analysis of the high density regime considering low particle densities too. We report on the emergence of various macroscopic patterns such as vortex arrays, mesoscale...
Topics: Condensed Matter, Soft Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1504.03034
3
3.0
Jun 29, 2018
06/18
by
D. V. Stäger; H. J. Herrmann
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eye 3
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Any space-filling packing of spheres can be cut by a plane to obtain a space-filling packing of disks. Here, we deal with space-filling packings generated using inversive geometry leading to exactly self-similar fractal packings. First, we prove that cutting along a random hyperplane leads in general to a packing with a fractal dimension of the one of the uncut packing minus one. Second, we find special cuts which can be constructed themselves by inversive geometry. Such special cuts have...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1609.03811
3
3.0
Jun 30, 2018
06/18
by
A. Vigentini; B. Van Hattem; E. Diato; P. Ponzellini; T. Meledina; A. Vanossi; G. Santoro; E. Tosatti; N. Manini
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eye 3
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Recent highly idealized model studies of lubricated nanofriction for two crystalline sliding surfaces with an interposed thin solid crystalline lubricant layer showed that the overall relative velocity of the lubricant $v_{\rm lub} / v_{\rm slider}$ depends only on the ratio of the lattice spacings, and retains a strictly constant value even when system parameters are varied within a wide range. This peculiar "quantized" dynamical locking was understood as due to the sliding-induced...
Topics: Soft Condensed Matter, Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.4290
2
2.0
Jun 29, 2018
06/18
by
Abdul N. Malmi-Kakkada; Oriol T. Valls; Chandan Dasgupta
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eye 2
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We calculate the dislocation glide mobility in solid $^4$He within a model that assumes the existence of a superfluid field associated with dislocation lines. Prompted by the results of this mobility calculation, we study within this model the role that such a superfluid field may play in the motion of the dislocation line when a stress is applied to the crystal. To do this, we relate the damping of dislocation motion, calculated in the presence of the assumed superfluid field, to the shear...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1610.08354
8
8.0
Jun 27, 2018
06/18
by
E. Kim; R. Chaunsali; H. Xu; J. Jaworski; J. Yang; P. Kevrekidis; A. F. Vakakis
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eye 8
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We study wave propagation in strongly nonlinear 1D diatomic granular crystals under an impact load. Depending on the mass ratio of the `light' to `heavy' beads, this system exhibits rich wave dynamics from highly localized traveling waves to highly dispersive waves featuring strong attenuation. We experimentally demonstrate the nonlinear resonant and anti-resonant interactions of particles and verify that the nonlinear resonance results in strong wave attenuation, leading to highly efficient...
Topics: Other Condensed Matter, Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1505.05556
3
3.0
Jun 27, 2018
06/18
by
Riccardo Artoni; Patrick Richard
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eye 3
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A new averaging method linking discrete to continuum variables of granular materials is developed and used to derive average balance equations. Its novelty lies in the choice of the decomposition between mean values and fluctuations of properties which takes into account the effect of gradients. Thanks to a local homogeneity hypothesis, whose validity is discussed, simplified balance equations are obtained. This original approach solves the problem of dependence of some variables on the size of...
Topics: Condensed Matter, Soft Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1503.02400
3
3.0
Jun 29, 2018
06/18
by
Sébastien Fumeron; Erms Pereira; Fernando Moraes
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eye 3
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The propagation of an electromagnetic wave in a medium with a screw dislocation is studied. Adopting the formalism of differential forms, it is shown that torsion is responsible for quantized modes. Moreover, it is demonstrated that the modes thus obtained have well defined orbital angular momentum, opening the possibility to design liquid-crystal-based optical tweezers.
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1608.03555
2
2.0
Jun 29, 2018
06/18
by
Julian Geske; Barbara Drossel; Michael Vogel
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eye 2
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We investigate anomalies in liquid silica with molecular dynamics simulations and present evidence for a fragile-to-strong transition at around 3100 K-3300 K. To this purpose, we studied the structure and dynamical properties of silica over a wide temperature range, finding four indicators of a fragile-to-strong transition. First, there is a density minimum at around 3000 K and a density maximum at 4700 K. The turning point is at 3400 K. Second, the local structure characterized by the...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1604.05062
5
5.0
Jun 28, 2018
06/18
by
Amarin G. McDonnell; Naveen N. Jason; Leslie Y. Yeo; James R. Friend; Wenlong Cheng; Ranganathan Prabhakar
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eye 5
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Suspensions of copper nanowires are emerging as new electronic inks for next-generation flexible electronics. Using a novel surface acoustic wave driven extensional flow technique we are able to perform currently lacking analysis of these suspensions and their complex buffer. We observe extensional viscosities from 3 mPa$\cdot$s (1 mPa$\cdot$s shear viscosity) to 37.2 Pa$\cdot$s via changes in the suspension concentration, thus capturing low viscosities that have been historically very...
Topics: Other Condensed Matter, Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1508.01145
3
3.0
Jun 30, 2018
06/18
by
Mathias Boström; Oleksandr I. Malyi; Prachi Parashar; K. V. Shajesh; Priyadarshini Thiyam; Kimball A. Milton; Clas Persson; Drew F. Parsons; Iver Brevik
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eye 3
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At air-water interfaces, the Lifshitz interaction by itself does not promote ice growth. On the contrary, we find that the Lifshitz force promotes the growth of an ice film, up to 1-8 nm thickness, near silica-water interfaces at the triple point of water. This is achieved in a system where the combined effect of the retardation and the zero frequency mode influences the short-range interactions at low temperatures, contrary to common understanding. Cancellation between the positive and...
Topics: Condensed Matter, Other Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1704.01332
2
2.0
Jun 29, 2018
06/18
by
David Bouttes; Emmanuelle Gouillart; Damien Vandembroucq
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eye 2
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The crucial role of hydrodynamic pinch-off instabilities is evidenced in the coarsening stage of viscous liquids. The phase separation of a barium borosilicate glass melt is studied by in-situ synchrotron X-Ray tomography at high temperature. The high viscosity contrast between the less viscous phase and the more viscous phase induces a topological symmetry breaking: capillary breakups occur preferentially in the less viscous phase. As a result, contrasting morphologies are obtained in the two...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1605.09542
2
2.0
Jun 29, 2018
06/18
by
V. A. Andryushchenko; L. P. Kondaurova; S. K. Nemirovskii
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eye 2
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The main goal of this paper is to investigate numerically the dynamics of quantized vortex loops, just before the reconnection at finite temperature, when mutual friction essentially changes evolution of lines. Modeling is performed on the base of vortex filament method with using the full Biot-Savart equation. It was discovered that initial position of vortices and the temperature strongly affect the dependence on time of the minimum distance $\delta (t)$ between tips of two vortex loops. In...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1602.05770
5
5.0
Jun 29, 2018
06/18
by
N. Manini; O. M. Braun; E. Tosatti; R. Guerra; A. Vanossi
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eye 5
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The nonlinear dynamics associated with sliding friction forms a broad interdisciplinary research field that involves complex dynamical processes and patterns covering a broad range of time and length scales. Progress in experimental techniques and computational resources has stimulated the development of more refined and accurate mathematical and numerical models, capable of capturing many of the essentially nonlinear phenomena involved in friction.
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1605.07037
3
3.0
Jun 29, 2018
06/18
by
N. S. K. Kumar; G. Govindaraj; U. Sailaja
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eye 3
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The molecular mobility of glass and supercooled liquid states of nilutamide has been studied with broadband dielectric spectroscopy for a wide range of temperature and frequency. Besides primary $\alpha$-relaxation an excess wing like secondary relaxation is observed. The temperature dependence of structural $\alpha$-relaxation show non-Arrhenius behaviour, and follows Vogel-Fulcher-Tammann (VFT) empirical formula. The glass transition temperature, T$_{g}$=302K and fragility index, m=76 are...
Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1606.06049
2
2.0
Jun 30, 2018
06/18
by
Matthias Kühnel; José M. Fernández; Filippo Tramonto; Guzmán Tejeda; Elena Moreno; Anton Kalinin; Marco Nava; Davide E. Galli; Salvador Montero; Robert E. Grisenti
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eye 2
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We report a quantitative experimental study of the crystallization kinetics of supercooled quantum liquid mixtures of para-hydrogen (pH$_2$) and ortho-deuterium (oD$_2$) by high spatial resolution Raman spectroscopy of liquid microjets. We show that in a wide range of compositions the crystallization rate of the isotopic mixtures is significantly reduced with respect to that of the pure substances. To clarify this behavior we have performed path-integral simulations of the non-equilibrium...
Topics: Other Condensed Matter, Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1410.2745
2
2.0
Jun 28, 2018
06/18
by
Maxime Lanoy; Romain Pierrat; Fabrice Lemoult; Mathias Fink; Valentin Leroy; Arnaud Tourin
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eye 2
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Thanks to a Multiple Scattering Theory algorithm, we present a way to focus energy at the deep subwavelength scale, from the far-field, inside a cubic disordered bubble cloud by using broadband Time Reversal (TR). We show that the analytical calculation of an effective wavenumber performing the Independant Scattering Approximation (ISA) matches the numerical results for the focal extension. Subwavelength focusings of lambda/100 are reported for simulations with perfect bubbles (no loss). A more...
Topics: Other Condensed Matter, Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1510.06911
12
12
Jun 26, 2018
06/18
by
Ye Yang; Lin Fu; Catherine Marcoux; Joshua E. S. Socolar; Patrick Charbonneau; Benjamin B. Yellen
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eye 12
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Phase transformations can be difficult to characterize at the microscopic level due to the inability to directly observe individual atomic motions. Model colloidal systems, by contrast, permit the direct observation of individual particle dynamics and of collective rearrangements, which allows for real-space characterization of phase transitions. Here, we study a quasi-two-dimensional, binary colloidal alloy that exhibits liquid-solid and solid-solid phase transitions, focusing on the kinetics...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1502.02955
6
6.0
Jun 27, 2018
06/18
by
Kuniyasu Saitoh; Vanessa Magnanimo; Stefan Luding
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eye 6
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An incremental evolution equation, i.e. a Master equation in statistical mechanics, is introduced for force distributions in polydisperse frictional particle packings. As basic ingredients of the Master equation, the conditional probability distributions of particle overlaps are determined by molecular dynamics simulations. Interestingly, tails of the distributions become much narrower in the case of frictional particles than frictionless particles, implying that correlations of overlaps are...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1505.07701
7
7.0
Jun 27, 2018
06/18
by
Thomas Heinemann; Karol Palczynski; Joachim Dzubiella; Sabine H. L. Klapp
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eye 7
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In this article we present and compare two different, coarse-grained approaches to model electrostatic interactions of disc-shaped aromatic molecules, specifically coronene. Our study builds on previous work [J. Chem. Phys. 141, 214110 (2014)] where we proposed, based on a systematic coarse-graining procedure starting from the atomistic level, an anisotropic effective (Gay-Berne-like) potential capable of describing van-der-Waals contributions to the interaction energy. To take into account...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1506.01796
3
3.0
Jun 29, 2018
06/18
by
A. Huerta; D. Tejeda; D. Henderson; A. Trokhymchuk
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eye 3
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The freezing mechanism suggested for a fluid composed of hard disks [Huerta et al., Phys. Rev. E, 2006, 74, 061106] is used here to probe the fluid-to-solid transition in a hard-dumbbell fluid composed of overlapping hard disks with a variable length between disk centers. Analyzing the trends in the shape of second maximum of the radial distribution function of the planar hard-dumbbell fluid it has been found that the type of transition could be sensitive to the length of hard-dumbbell...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.07147
17
17
Jun 27, 2018
06/18
by
Harri Mökkönen; Timo Ikonen; Tapio Ala-Nissila; Hannes Jónsson
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eye 17
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The rate of escape of polymers from a two-dimensionally confining potential well has been evaluated using self-avoiding as well as ideal chain representations of varying length, up to 80 beads. Long timescale Langevin trajectories were calculated using the path integral hyperdynamics method to evaluate the escape rate. A minimum is found in the rate for self-avoiding polymers of intermediate length while the escape rate decreases monotonically with polymer length for ideal polymers. The...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1503.07739
2
2.0
Jun 29, 2018
06/18
by
Kento Yasuda; Shigeyuki Komura; Ryuichi Okamoto
texts
eye 2
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Active motions of a biological membrane can be induced by non-thermal fluctuations that occur in the outer environment of the membrane. We discuss the dynamics of a membrane interacting hydrodynamically with an active wall that exerts random velocities on the ambient fluid. Solving the hydrodynamic equations of a bound membrane, we first derive a dynamic equation for the membrane fluctuation amplitude in the presence of different types of walls. Membrane two-point correlation functions are...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1602.02870
2
2.0
Jun 29, 2018
06/18
by
Efi Efrati; Yifan Wang; Heinrich M. Jaeger; Thomas A. Witten
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eye 2
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We discuss the response of thin cylindrical tubes to small indentations. The stretching-free embedding of these surfaces is completely determined by the embedding of one edge curve, thus reducing their bending response to an effectively one dimensional problem. We obtain that in general thin cylindrical tubes will bend non-uniformly in response to an indentation normal to their surface. As a consequence, their local bending stiffness, as measured by indenting at various locations along their...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.01808
2
2.0
Jun 29, 2018
06/18
by
Chiqun Zhang; Xiaohan Zhang; Amit Acharya; Dmitry Golovaty; Noel Walkington
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eye 2
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Nonsingular disclination dynamics in a uniaxial nematic liquid crystal is modeled within a mathematical framework where the kinematics is a direct extension of the classical way of identifying these line defects with singularities of a unit vector field representing the nematic director. It is well known that the universally accepted Oseen-Frank energy is infinite for configurations that contain disclination line defects. We devise a natural augmentation of the Oseen-Frank energy to account for...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.01771
2
2.0
Jun 29, 2018
06/18
by
G. Mazovec; M. Lukšič; B. Hribar-Lee
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eye 2
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By means of Monte Carlo computer simulations in the isothermal-isobaric ensemble, we investigated the interaction of a hydrophobic ligand with the hydrophobic surfaces of various curvatures (planar, convex and concave). A simple two-dimensional model of water, hydrophobic ligand and surface was used. Hydration/dehidration phenomena concerning water molecules confined close to the molecular surface were investigated. A notable dewetting of the hydrophobic surfaces was observed together with the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.02163
2
2.0
Jun 29, 2018
06/18
by
M. Kaja; S. Lamperski; W. Silvestre-Alcantara; L. B. Bhuiyan; D. Henderson
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eye 2
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Grand canonical Monte Carlo simulation results are reported for an electric double layer modelled by a planar charged hard wall, anisotropic shape cations, and spherical anions at different electrolyte concentrations and asymmetric valencies. The cations consist of two tangentially tethered hard spheres of the same diameter, $d$. One sphere is charged while the other is neutral. Spherical anions are charged hard spheres of diameter $d$. The ion valency asymmetry 1:2 and 2:1 is considered, with...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.02445
3
3.0
Jun 29, 2018
06/18
by
Frédéric Poitevin; Marc Delarue; Henri Orland
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eye 3
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We present a method aimed at sampling charge density fluctuations in Coulomb systems. The derivation follows from a functional integral representation of the partition function in terms of charge density fluctuations. Starting from the mean-field solution given by the Poisson-Boltzmann equation, an original approach is proposed to numerically sample fluctuations around it, through the propagation of a Langevin like stochastic partial differential equation (SPDE). The diffusion tensor of the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.05892
2
2.0
Jun 29, 2018
06/18
by
William D. Piñeros; Michael Baldea; Thomas M. Truskett
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eye 2
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We use inverse methods of statistical mechanics to explore trade-offs associated with designing interactions to stabilize self-assembled structures against changes in density or temperature. Specifically, we find isotropic,convex-repulsive pair potentials that maximize the density range for which a two-dimensional square lattice is the stable ground state subject to a constraint on the chemical potential advantage it exhibits over competing structures (i.e., 'depth' of the associated minimum on...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.05989
2
2.0
Jun 29, 2018
06/18
by
M. -Y. Nagazi; G. Brambilla; G. Meunier; P. Marguerès; J. -N. Périé; L. Cipelletti
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eye 2
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We couple a laser-based, space-resolved dynamic light scattering apparatus to a universal testing machine for mechanical extensional tests. We perform simultaneous optical and mechanical measurements on polyether ether ketone, a semi-crystalline polymer widely used in the industry. Due to the high turbidity of the sample, light is multiply scattered by the sample and the diffusing wave spectroscopy (DWS) formalism is used to interpret the data. Space-resolved DWS yields spatial maps of the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.06384
3
3.0
Jun 29, 2018
06/18
by
Masao Iwamatsu
texts
eye 3
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The effects of line tension on the morphology of a lens-shaped droplet and bubble placed on the inner wall of a spherical cavity are studied. The contact angle between the lens-shaped droplet and the concave spherical substrate is expressed by the generalized Young's formula. The equator of the spherical substrate is found to play a crucial role. Neither a droplet with its contact line on the upper hemisphere of the substrate nor one with its contact line on the lower hemisphere can transform...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.09023
2
2.0
Jun 29, 2018
06/18
by
Hsiao-Ping Hsu; Kurt Kremer
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eye 2
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We present a detailed study of the static and dynamic behavior of long semiflexible polymer chains in a melt. Starting from previously obtained fully equilibrated high molecular weight polymer melts [{\it Zhang et al.} ACS Macro Lett. 3, 198 (2014)] we investigate their static and dynamic scaling behavior as predicted by theory. We find that for semiflexible chains in a melt, results of the mean square internal distance, the probability distributions of the end-to-end distance, and the chain...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1604.00245
2
2.0
Jun 29, 2018
06/18
by
Endao Han; Ivo R. Peters; Heinrich M. Jaeger
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eye 2
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A remarkable property of dense suspensions is that they can transform from liquid-like at rest to solid-like under sudden impact. Previous work showed that this impact-induced solidification involves rapidly moving jamming fronts; however, details of this process have remained unresolved. Here we use high-speed ultrasound imaging to probe non-invasively how the interior of a dense suspension responds to impact. Measuring the speed of sound we demonstrate that the solidification proceeds without...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1604.00380
4
4.0
Jun 29, 2018
06/18
by
Jonathan A. Bollinger; Thomas M. Truskett
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eye 4
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Using computer simulations, we validate a simple free energy model that can be analytically solved to predict the equilibrium size of self-limiting clusters of particles in the fluid state governed by a combination of short-range attractive and long-range repulsive pair potentials. The model is a semi-empirical adaptation and extension of the canonical free energy-based result due to Groenewold and Kegel [J. Phys. Chem. B, 105 (2001)], where we use new computer simulation data to systematically...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1605.04815
2
2.0
Jun 29, 2018
06/18
by
Wen-Sheng Xu; Karl F. Freed
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eye 2
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The lattice cluster theory (LCT) for strongly interacting, self-assembling telechelic polymers provides a theoretical tool that enables establishing the connections between important microscopic molecular details of self-assembling polymers and their bulk thermodynamics. The original LCT for self-assembly of telechelic polymers considers a model of fully flexible linear chains [J. Dudowicz and K. F. Freed, J. Chem. Phys. \textbf{136}, 064902 (2012)], while our recent work introduces a...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1605.09092
3
3.0
Jun 29, 2018
06/18
by
G. Swaminath Bharadwaj; P. B. Sunil Kumar; Shigeyuki Komura; Abhijit P. Deshpande
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We study the lower critical solution temperature (LCST) in thermoresponsive polymer solutions by means of a coarse grained single polymer chain simulation and a theoretical approach. The simulation model includes solvent explicitly and thus accounts for solvent interactions and entropy directly. The theoretical model consists of a single chain polymer in an implicit solvent where the effect of solvent is included through the intra-polymer solvophobic potential proposed by Kolomeisky and Widom....
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1605.09209
2
2.0
Jun 29, 2018
06/18
by
Carsten Svaneborg; Hossein Ali Karimi-Varzaneh; Nils Hojdis; Frank Fleck; Ralf Everaers
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eye 2
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We present an effective and simple multiscale method for equilibrating Kremer Grest model polymer melts of varying stiffness. In our approach, we progressively equilibrate the melt structure above the tube scale, inside the tube and finally at the monomeric scale. We make use of models designed to be computationally effective at each scale. Density fluctuations in the melt structure above the tube scale are minimized through a Monte Carlo simulated annealing of a lattice polymer model....
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.00609
3
3.0
Jun 29, 2018
06/18
by
Bastiaan Florijn; Corentin Coulais; Martin van Hecke
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eye 3
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We experimentally and numerically study the precise role of geometry for the mechanics of biholar metamaterials, quasi-2D slabs of rubber patterned by circular holes of two alternating sizes. We recently showed how the response to uniaxial compression of these metamaterials can be programmed by their lateral confinement $^1$. In particular, there is a range of confining strains $\varepsilon_x$ for which the resistance to compression becomes non-trivial - non-monotonic or hysteretic - in a range...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.00658
2
2.0
Jun 29, 2018
06/18
by
Alexander Geiseler; Peter Hänggi; Gerhard Schmid
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eye 2
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We investigate the escape rate of an overdamped, self-propelled spherical Brownian particle on a surface from a metastable potential well. Within a modeling in terms of a 1D constant speed of the particle's active dynamics we consider the associated rate using both numerical and analytical approaches. Regarding the properties of the stationary state in the potential well, two major timescales exist, each governing the translational and the rotational dynamics of the particle, respectively. The...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.01798
2
2.0
Jun 29, 2018
06/18
by
Carsten Svaneborg; Hossein Ali Karimi-Varzaneh; Nils Hojdis; Frank Fleck; Ralf Everaers
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eye 2
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The Kremer-Grest (KG) bead-spring model is a near standard in Molecular Dynamic simulations of generic polymer properties. It owes its popularity to its computational efficiency, rather than its ability to represent specific polymer species and conditions. Here we investigate how to adapt the model to match the universal properties of a wide range of chemical polymers species. For this purpose we vary a single parameter originally introduced by Faller and M\"uller-Plathe, the chain...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.05008
2
2.0
Jun 29, 2018
06/18
by
Wilfried Schoepe
texts
eye 2
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Vortex shedding from a microsphere oscillating in superfluid $^4$He at mK temperatures is compared with that from a laser beam moving in a Bose-Einstein condensate (BEC) as observed by other authors. In particular, in either case a linear dependence of the shedding frequency $f_v$ on $\Delta v = v - v_c$ is observed, where $v$ is the velocity amplitude of the sphere or the constant velocity of the laser beam above a critical velocity $v_c$ for the onset of turbulent flow: $f_v = a \,\Delta v$,...
Topics: Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1606.07919
2
2.0
Jun 29, 2018
06/18
by
Gaetano Napoli; Luigi Vergori
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We derive the hydrodynamic equations for nematic liquid crystals lying on curved substrates. We invoke the Lagrange-Rayleigh variational principle to adapt the Ericksen-Leslie theory to two-dimensional nematics in which a degenerate anchoring of the molecules on the substrate is enforced. The only constitutive assumptions in this scheme concern the free-energy density, given by the two-dimensional Frank potential, and the density of dissipation which is required to satisfy appropriate...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.00823
2
2.0
Jun 29, 2018
06/18
by
Maxym Dudka; Svyatoslav Kondrat; Alexei Kornyshev; Gleb Oshanin
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The ion-ion interactions become exponentially screened for ions confined in ultranarrow metallic pores. To study the phase behaviour of an assembly of such ions, called a superionic liquid, we develop a statistical theory formulated on bipartite lattices, which allows an analytical solution within the Bethe-lattice approach. Our solution predicts the existence of ordered and disordered phases in which ions form a crystal-like structure and a homogeneous mixture, respectively. The transition...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.00646
2
2.0
Jun 29, 2018
06/18
by
Elsen Tjhung; Ludovic Berthier
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Tracking experiments in dense biological tissues reveal a diversity of sources f or local energy injection at the cell scale. The effect of cell motility has been largely studied, but much less is known abo ut the effect of the observed volume fluctuations of individual cells. We devise a simple microscopic model of `actively-deforming' particles where local fluctuations of the particle size constitute a unique source of motion. We demonstrate that collective motion can emerge under the sole...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.01734
2
2.0
Jun 29, 2018
06/18
by
N. B. Weingartner; C. Pueblo; F. S. Nogueira; K. F. Kelton; Z. Nussinov
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All liquids in nature can be supercooled to form a glass. Surprisingly, although this phenomenon has been employed for millennia, it still remains ill-understood. Perhaps the most puzzling feature of supercooled liquids is the dramatic increase in their viscosity as the temperature ($T$) is lowered. This precipitous rise has long posed a fundamental theoretical challenge. Numerous approaches currently attempt to explain this phenomenon. When present, data collapse points to an underlying...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.08625
3
3.0
Jun 29, 2018
06/18
by
Nikolai V. Priezjev
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The influence of periodic shear deformation on nonaffine atomic displacements in an amorphous solid is examined via molecular dynamics simulations. We study the three-dimensional Kob-Andersen binary mixture model at a finite temperature. It is found that when the material is periodically strained, most of the atoms undergo repetitive nonaffine displacements with amplitudes that are broadly distributed. We show that particles with large amplitudes of nonaffine displacements are organized into...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.08598
4
4.0
Jun 29, 2018
06/18
by
Alexandre Darmon; Michael Benzaquen; Simon Čopar; Olivier Dauchot; Teresa Lopez-Leon
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We investigate experimentally and numerically the defect configurations emerging when a cholesteric liquid crystal is confined to a spherical shell. We uncover a rich scenario of defect configurations, some of them non-existent in nematic shells, where new types of defects are stabilized by the helical ordering of the liquid crystal. In contrast to nematic shells, here defects are not simple singular points or lines, but have a large structured core. Specifically, we observe five different...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1608.00090
2
2.0
Jun 29, 2018
06/18
by
Alexandre Darmon; Olivier Dauchot; Teresa Lopez-Leon; Michael Benzaquen
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We present a novel, self-consistent and robust theoretical model to investigate elastic interactions between topological defects in liquid crystal shells. Accounting for the non-concentric nature of the shell in a simple manner, we are able to successfully and accurately explain and predict the positions of the defects, most relevant in the context of colloidal self-assembly. We calibrate and test our model on existing experimental data, and extend it to all newly observed defects...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1608.00714
