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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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305

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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177

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phisicks

Topic: condensed

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2.0

Jun 28, 2018
06/18

by
Yu. A. Budkov; A. L. Kolesnikov; M. G. Kiselev

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We study the conformational behavior of polarizable polymer chain under an external homogeneous electric field within the Flory type self-consistent field theory. We consider the influence of electric field on the polymer coil as well as on the polymer globule. We show that when the polymer chain conformation is a coil, application of external electric field leads to its additional swelling. However, when the polymer conformation is a globule, a sufficiently strong field can induce a...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1508.06386

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3.0

Jun 28, 2018
06/18

by
B. Kamala Latha; Regina Jose; K. P. N. Murthy; V. S. S. Sastry

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Investigations of the phase diagram of biaxial liquid crystal systems through analyses of general Hamiltonian models within the simplifications of mean-field theory (MFT), as well as by computer simulations based on microscopic models, are directed towards an appreciation of the role of the underlying molecular-level interactions to facilitate its spontaneous condensation into a nematic phase with biaxial symmetry. Continuing experimental challenges in realising such a system unambiguously,...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.03834

2
2.0

Jun 30, 2018
06/18

by
Ekin D. Cubuk; Samuel S. Schoenholz; Jennifer M. Rieser; Brad D. Malone; Joerg Rottler; Douglas J. Durian; Efthimios Kaxiras; Andrea J. Liu

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We use machine learning methods on local structure to identify flow defects - or regions susceptible to rearrangement - in jammed and glassy systems. We apply this method successfully to two disparate systems: a two dimensional experimental realization of a granular pillar under compression, and a Lennard-Jones glass in both two and three dimensions above and below its glass transition temperature. We also identify characteristics of flow defects that differentiate them from the rest of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.6820

3
3.0

Jun 28, 2018
06/18

by
B. Kamala Latha; K. P. N. Murthy; V. S. S. Sastry

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Phase sequences of the biaxial nematic liquid crystal in the interior of the essential triangle are studied with Wang Landau sampling. The evidence points to the existence of an intermediate unixial phase with low biaxiality in the isotropic to biaxial nematic phase sequence.

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1509.04683

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8.0

Jun 27, 2018
06/18

by
L. Martínez-Balbuena; A. Maldonado-Arce; E. Hernández-Zapata

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In this article we review the present knowledge on the elastic properties of membranes of biological origin. Assuming the fluid mosaic hypothesis, we consider the phospholipid bilayer as the structural base of a biological membrane. We expose a model due to Helfrich which can be used to obtain an expression for the membrane elastic energy. The free energy is completely characterized by two local principal curvatures and four parameters that depend on the chemical composition of the membrane and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1506.03438

3
3.0

Jun 28, 2018
06/18

by
Ryan B. Jadrich; Jonathan A. Bollinger; Beth A. Lindquist; Thomas M. Truskett

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Inverse methods of statistical mechanics are becoming productive tools in the design of materials with specific microstructures or properties. While initial studies have focused on solid-state design targets (e.g, assembly of colloidal superlattices), one can alternatively design fluid states with desired morphologies. This work addresses the latter and demonstrates how a simple iterative Boltzmann inversion strategy can be used to determine the isotropic pair potential that reproduces the...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.06936

1
1.0

Jun 30, 2018
06/18

by
A. P. Itin; M. I. Katsnelson

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We consider 1D lattices described by Hubbard or Bose-Hubbard models, in the presence of periodic high-frequency perturbations, such as uniform ac force or modulation of hopping coefficients. Effective Hamiltonians for interacting particles are derived using an averaging method resembling classical canonical perturbation theory. As is known, a high-frequency force may renormalize hopping coefficients, causing interesting phenomena such as coherent destruction of tunnelling and creation of...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.0402

1
1.0

Jun 30, 2018
06/18

by
V. Chikkadi; D. M. Miedema; B. Nienhuis; P. Schall

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We demonstrate that application of an increasing shear field on a glass leads to an intriguing dynamic first order transition in analogy to equilibrium transitions. By following the particle dynamics as a function of the driving field in a colloidal glass, we identify a critical shear rate upon which the diffusion time scale of the glass exhibits a sudden discontinuity. Using a new dynamic order parameter, we show that this discontinuity is analogous to a first order transition, in which the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.2100

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1.0

Jun 30, 2018
06/18

by
Kazumi Suematsu

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The mathematical derivation of the mean square radius of gyration, , of branched polymers is reinvestigated from a kinetic-equation-point of view. In particular we derive the corresponding quantity of the A-R-Bf-1 model; the result showing that the mean square radius of gyration is precisely identical with that of the R-Af model.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.6408

1
1.0

Jun 30, 2018
06/18

by
Le Bouil Antoine; Amon Axelle; McNamara Sean; Crassous Jérôme

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The elastic coupling between plastic events is generally invoked to interpret plastic properties and failure of amorphous soft glassy materials. We report an experiment where the emergence of a self-organized plastic flow is observed well before the failure. For this we impose an homogeneous stress on a granular material, and measure local deformations for very small strain increments using a light scattering setup. We observe a non-homogeneous strain that appears as transient bands of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.7304

1
1.0

Jun 30, 2018
06/18

by
Epifanio G. Virga

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The ground state of twist-bend nematic liquid crystals is a heliconical molecular arrangement in which the nematic director precesses uniformly about an axis, making a fixed angle with it. Both precession senses are allowed in the ground state of these phases. When one of the two \emph{helicities} is prescribed, a single helical nematic phase emerges. A quadratic elastic theory is proposed here for each of these phases which features the same elastic constants as the classical theory of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.0119

1
1.0

Jun 30, 2018
06/18

by
Niladri Sarkar; Abhik Basu

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We propose a minimal model for miscibility phase transitions (MPTs) in a class of asymmetric two-component heterogeneous fluid membranes at equilibrium that generically display both first and second order MPTs, controlled by the interplay of asymmetry and heterogeneity. In the vicinity of the MPTs, the membrane fluctuations are generally enhanced. However, the degree of enhancement is found to depend sensitively on the asymmetry-heterogeneity coupling. We argue that experimental measurements of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.0755

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0.0

Jun 30, 2018
06/18

by
Stephan Korden

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Recently it has been shown that the heuristic Rosenfeld functional derives from the virial expansion for particles which overlap in one center. Here, we generalize this approach to any number of intersections. Starting from the virial expansion in Ree-Hoover diagrams, it is shown in the first part that each intersection pattern defines exactly one infinite class of diagrams. Determining their automorphism groups, we sum over all its elements and derive a generic functional. The second part...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.2054

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0.0

Jun 30, 2018
06/18

by
Andreas Kaiser; Anton Peshkov; Andrey Sokolov; Borge ten Hagen; Hartmut Löwen; Igor S. Aranson

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We demonstrate that collective turbulent-like motion in a bacterial bath can power and steer directed transport of mesoscopic carriers through the suspension. In our experiments and simulations, a microwedge-like "bulldozer" draws energy from a bacterial bath of varied density. We obtain that a maximal transport speed is achieved in the turbulent state of the bacterial suspension. This apparent rectification of random motion of bacteria is caused by polar ordered bacteria inside the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.4062

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0.0

Jun 30, 2018
06/18

by
Matthieu Marechal; Stephan Korden; Klaus Mecke

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Fundamental measure theory (FMT) for hard particles has great potential for predicting the phase behavior of colloidal and nanometric shapes. The modern versions of FMT are usually derived from the zero-dimensional limit, a system of at most one particle confined in a collection of cavities in the limit that all cavities shrink to the size of the particle. In [Phys. Rev. E 85, 041150 (2012)], a derivation from an approximated and resummed virial expansion was presented, whose result was not...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.4505

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0.0

Jun 30, 2018
06/18

by
X. Wang; G. Drazer

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We study the transport of Brownian particles under a constant driving force and moving in channels that present a varying centerline but have constant aperture width. We investigate two types of channels, {\it solid} channels in which the particles are geometrically confined between walls and {\em soft} channels in which the particles are confined by a periodic potential. We consider the limit of narrow, slowly-varying channels, i.e., when the aperture and the variation in the position of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1406.3226

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0.0

Jun 30, 2018
06/18

by
Laurent Helden; Ralf Eichhorn; Clemens Bechinger

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We study the thermophoretic motion of a micron sized single colloidal particle in front of a flat wall by evanescent light scattering. To quantify thermophoretic effects we analyse the nonequilibrium steady state (NESS) of the particle in a constant temperature gradient perpendicular to the confining walls. We propose to determine thermophoretic forces from a 'generalized potential' associated with the probability distribution of the particle position in the NESS. Experimentally we demonstrate,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.6339

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1.0

Jun 30, 2018
06/18

by
G. Bertaina; M. Motta; M. Rossi; E. Vitali; D. E. Galli

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We compute the zero-temperature dynamical structure factor of one-dimensional liquid $^4$He by means of state-of-the-art Quantum Monte Carlo and analytic continuation techniques. By increasing the density, the dynamical structure factor reveals a transition from a highly compressible critical liquid to a quasi-solid regime. In the low-energy limit, the dynamical structure factor can be described by the quantum hydrodynamic Luttinger liquid theory, with a Luttinger parameter spanning all...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.7179

1
1.0

Jun 26, 2018
06/18

by
Kasper van der Vaart; Parmesh Gajjar; Gaël Epely-Chauvin; Nicolas Andreini; J. M. N. T. Gray; Christophe Ancey

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We experimentally study particle scale dynamics during segregation of a bidisperse mixture under oscillatory shear. Large and small particles show an underlying asymmetry that is dependent on the local particle concentration, with small particles segregating faster in regions of many large particles and large particles segregating slower in regions of many small particles. We quantify the asymmetry on bulk and particle scales, and capture it theoretically. This gives new physical insight into...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1501.06879

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0.0

Jun 28, 2018
06/18

by
F. Castles

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Recent experiments have found that a mechanically distorted blue phase can exhibit a primary linear electro-optic (Pockels) effect [F. Castles \textit{et al}. Nature Mater. \textbf{13}, 817 (2014)]. Here it is shown that flexoelectricity can account for the experimental results and a model, which is based on continuum theory but takes account of the sub-unit-cell structure, is proposed. The model provides a quantitative description of the effect accurate to the nearest order of magnitude and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.08151

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1.0

Jun 28, 2018
06/18

by
Wilfried Schoepe

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This comment is on Phys.Rev.Lett. 144, 155302 (2015) by M.T. Reeves, T.P. Billam, B.P. Anderson, and A.S. Bradley "Identifying a superfluid Reynolds number via dynamical similarity" where a new superfluid Reynolds number is introduced. This definition is shown to be useful in the data analysis of the finite lifetime of turbulence observed with an oscillating sphere in superfluid helium at mK temperatures in a small velocity interval $\Delta v =(v-v_c)$ just above the critical velocity...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1506.05003

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1.0

Jun 30, 2018
06/18

by
Jie Xu; Fangfu Ye; Pingwen Zhang

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We construct a tensor model for nematic phases of bent-core molecules from molecular theory. The form of free energy is determined by molecular symmetry, which includes the couplings and derivatives of a vector and two second-order tensors, with the coefficients determined by molecular parameters. We use the model to study the nematic phases resulted from the hard-core potential, and obtain the phase diagram about the molecular parameters. The tensor model is applicable to other molecules with...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.3722

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0.0

Jun 30, 2018
06/18

by
T. Lyons; M. Ginther; P. Mascarenas; E. Rickard; J. Robinson; J. Braeger; H. Liu; A. Ludu

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We study the dynamics and the optimization of the shock deceleration supported by a payload when its airborne carrier impacts the ground. We build a nonlinear elastic model for a container prototype and an elastic suspension system for the payload. We model the dynamics of this system and extract information on maximum deceleration, energy transfer between the container and payload, and energy resonant damping. We designed the system and perform lab experiments for various terminal velocities...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.4190

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0.0

Jun 30, 2018
06/18

by
M. Tröndle; L. Harnau; S. Dietrich

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We study critical Casimir forces between planar walls and geometrically structured substrates within mean-field theory. As substrate structures, crenellated surfaces consisting of periodic arrays of rectangular crenels and merlons are considered. Within the widely used proximity force approximation, both the top surfaces of the merlons and the bottom surfaces of the crenels contribute to the critical Casimir force. However, for such systems the full, numerically determined critical Casimir...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.6088

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1.0

Jun 30, 2018
06/18

by
Giovanni Noselli; Antonio DeSimone

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We present experimental and numerical results for a model crawler which is able to extract net positional changes from reciprocal shape changes, i.e. 'breathing-like' deformations, thanks to directional, frictional interactions with a textured solid substrate, mediated by flexible inclined feet. We also present a simple reduced model that captures the essential features of the kinematics and energetics of the gait, and compare its predictions with the results from experiments and from numerical...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.6470

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1.0

Jun 30, 2018
06/18

by
Yoav Matia; Amir Gat

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Deformation due to embedded fluidic networks is currently studied in the context of soft-actuators and soft-robotics. Expanding on this concept, beams can be designed so that the pressure in the channel-network is created directly from external forces acting on the beam, and thus can be viewed as passive solid-liquid composite structure. We obtain a continuous function relating the network geometry to the deformation. This enables design of networks creating arbitrary steady and time varying...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2113

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0.0

Jun 30, 2018
06/18

by
H. Löwen; M. Heinen

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While the theory of diffusion of a single Brownian particle in confined geometries is well-established by now, we discuss here the theoretical framework necessary to generalize the theory of diffusion to dense suspensions of strongly interacting Brownian particles. Dynamical density functional theory (DDFT) for classical Brownian particles represents an ideal tool for this purpose. After outlining the basic ingredients to DDFT we show that it can be readily applied to flowing suspensions with...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2505

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0.0

Jun 30, 2018
06/18

by
Marc Bletry; Jean Bletry

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Sequentially-built random sphere-packings have been numerically studied in the packing fraction interval $0.329 < \gamma < 0.586$. For that purpose fast running geometrical algorithms have been designed in order to build about 300 aggregates, containing $10^6$ spheres each one, which allowed a careful study of the local fluctuations and an improved accuracy in the calculations of the pair distribution $P(r)$ and structure factors $S(Q)$ of the aggregates. Among various parameters (Voronoi...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2379

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0.0

Jun 30, 2018
06/18

by
Dominic Vella; Jiangshui Huang; Narayanan Menon; Thomas P. Russell; Benny Davidovitch

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We study the indentation of a thin elastic film floating at the surface of a liquid. We focus on the onset of radial wrinkles at a threshold indentation depth and the evolution of the wrinkle pattern as indentation progresses far beyond this threshold. Comparison between experiments on thin polymer films and theoretical calculations shows that the system very quickly reaches the Far from Threshold (FT) regime, in which wrinkles lead to the relaxation of azimuthal compression. Furthermore, when...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.2795

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1.0

Jun 28, 2018
06/18

by
Ethayaraja Mani; Hartmut Löwen

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In equilibrium, colloidal suspensions governed by short-range attractive and long-range repulsive interactions form thermodynamically stable clusters. Using Brownian dynamics computer simulations, we investigate how this equilibrium clustering is affected when such particles are self-propelled. We find that the clustering process is stable under self-propulsion. For the range of interaction parameters studied and at low particle density, the cluster size increases with the speed of...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1508.02194

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0.0

Jun 29, 2018
06/18

by
Nikita Tretyakov; Burkhard Dünweg

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We consider the dissipative coupling between a stochastic Lattice Boltzmann (LB) fluid and a particle-based Molecular Dynamics (MD) system, as it was first introduced by Ahlrichs and D\"unweg (J. Chem. Phys. 111 (1999) 8225). The fluid velocity at the position of a particle is determined by interpolation, such that a Stokes friction force gives rise to an exchange of momentum between the particle and the surrounding fluid nodes. For efficiency reasons, the LB time step is chosen as a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1610.02733

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1.0

Jun 29, 2018
06/18

by
Daniel M. Sussman; Samuel S. Schoenholz; Ekin D. Cubuk; Andrea J. Liu

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Nanometrically thin glassy films depart strikingly from the behavior of their bulk counterparts. We investigate whether the dynamical differences between bulk and thin film glasses can be understood by differences in local microscopic structure. We employ machine-learning methods that have previously identified strong correlations between local structure and particle rearrangement dynamics in bulk systems. We show that these methods completely fail to detect key aspects of thin-film glassy...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1610.03401

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1.0

Jun 30, 2018
06/18

by
T. A. Engstrom; J. M. Schwarz

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Harnessing a model from composite materials science, we show how point-like cusped surface features arise as quasi-particle excitations, termed "ghost fibers", on the surface of a homogeneous soft elastic material. These deformations appear above a critical compressive strain at which ghost fiber dipoles unbind, analogous to vortices in the Kosterlitz-Thouless transition. Finite-length creases can be described in the same framework. Our predictions for crease surface profiles and...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.05530

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0.0

Jun 30, 2018
06/18

by
Sebastien Kosgodagan Acharige; Justine Laurent; Audrey Steinberger

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We investigate the capillary force that applies on a tilted cylinder as a function of its dipping angle i, using a home-built tilting Atomic Force Microscope (AFM) with custom made probes. A micrometric-size rod is glued at the end of an AFM cantilever of known stiffness, whose deflection is measured when the cylindrical probe is dipped in and retracted from reference liquids. We show that a torque correction is necessary to understand the measured deflection. The results are compatible with a...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.06881

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1.0

Jun 30, 2018
06/18

by
Alexander Geiseler; Peter Hänggi; Fabio Marchesoni

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Contrary to microbial taxis, where a tactic response to external stimuli is controlled by complex chemical pathways acting like sensor-actuator loops, taxis of artificial microswimmers is a purely stochastic effect associated with a non-uniform activation of the particles' self-propulsion. We study the tactic response of such swimmers in a spatio-temporally modulated activating medium by means of both numerical and analytical techniques. In the opposite limits of very fast and very slow...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.08763

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1.0

Jun 30, 2018
06/18

by
Mengjie Zu; Peng Tan; Ning Xu

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In previous approaches to form quasicrystals, multiple competing length scales involved in particle size, shape or interaction potential are believed to be necessary. It is unexpected that quasicrystals can be self-assembled by monodisperse, isotropic particles interacting via a simple potential without multiple length scales. Here we report the surprising finding of the self-assembly of such quasicrystals in two dimensional systems of soft-core disks interacting via repulsions. We find not...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.08783

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0.0

Jun 30, 2018
06/18

by
Andreas Reindl; Markus Bier; S. Dietrich

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Density functional theory is used to describe electrolyte solutions in contact with electrodes of planar or spherical shape. For the electrolyte solutions we consider the so-called civilized model, in which all species present are treated on equal footing. This allows us to discuss the features of the electric double layer in terms of the differential capacitance. The model provides insight into the microscopic structure of the electric double layer, which goes beyond the mesoscopic approach...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.09661

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Jun 30, 2018
06/18

by
Madhu Priya; Yitzhak Rabin

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We use molecular dynamics simulations to study the behavior of a compressible Lennard-Jones fluid in simple shear flow in a two-dimensional nanochannel. The system is equilibrated in the fluid phase close to the triple point at which gas, liquid and solid phases coexist and is subjected to steady shear in Couette geometry. It is observed that at higher shear rates, the system develops a density gradient perpendicular to the direction of flow and exhibits solid-like layering near the boundaries....

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.10461

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0.0

Jun 29, 2018
06/18

by
S. I. Denisov; B. O. Pedchenko

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A minimal system of equations is introduced and applied to study the drift motion of ferromagnetic particles suspended in a viscous fluid and subjected to a time-periodic driving force and a nonuniformly rotating magnetic field. It is demonstrated that the synchronized translational and rotational oscillations of these particles are accompanied by their drift in a preferred direction, which occurs under the action of the Magnus force. We calculate both analytically and numerically the drift...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1611.06588

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Jun 29, 2018
06/18

by
Florencio Balboa Usabiaga; Blaise Delmotte; Aleksandar Donev

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We develop efficient numerical methods for performing many-body Brownian dynamics simulations of a recently-observed fingering instability in an active suspension of colloidal rollers sedimented above a wall [M. Driscoll, B. Delmotte, M. Youssef, S. Sacanna, A. Donev and P. Chaikin, Nature Physics, 2016, doi:10.1038/nphys3970]. We present a stochastic Adams-Bashforth integrator for the equations of Brownian dynamics, which has the same cost as but is more accurate than the widely-used...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1612.00474

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1.0

Jun 28, 2018
06/18

by
L. G. Rizzi; S. Auer; D. A. Head

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Disordered fibre networks are ubiquitous in nature and have a wide range of industrial applications as novel biomaterials. Predicting their viscoelastic response is straightforward for affine deformations that are uniform over all length scales, but when affinity fails, as has been observed experimentally, modelling becomes challenging. Here we introduce a numerical methodology to predict the steady-state viscoelastic spectra and degree of affinity for disordered fibre networks driven at...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1512.06738

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Jun 28, 2018
06/18

by
Erick Sarmiento-Gómez; José Ramón Villanueva-Valencia; Salvador Herrera-Velarde; José Arturo Ruíz-Santoyo; Jesús Santana-Solano; José Luis Arauz-Lara; Ramón Castañeda-Priego

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We report on the short-time dynamics in colloidal mixtures made up of monomers and dimers highly confined between two glass-plates. At low concentrations, the experimental measurements of colloidal motion agree well with the solution of the Navier-Stokes equation at low Reynolds numbers, which takes into account the increase of the drag force on each particle due to wall-particle hydrodynamic forces. We find that the ratio of the short-time diffusion coefficients of the monomer and that of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1512.06933

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1.0

Jun 28, 2018
06/18

by
Handan Arkin; Hakan Alaboz

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The folding vs. adsorption behaviour of a coarse-grained off-lattice protein model near an attractive surface is presented within the frame of a Multicanonical Monte Carlo simulations. In the polymer-surface model, the Lennard-Jones potential is assumed as an interaction potential between the effective monomers and the attractive surface. Thermodynamic properties and some structural parameters for the minimum energy conformations are calculated for comparison of the folding and adsorption cases.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1512.07054

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0.0

Jun 29, 2018
06/18

by
Fernando Martinez-Pedrero; Pietro Tierno

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We demonstrate a general method to assemble and propel highly maneuverable colloidal carpets which can be steered via remote control in any direction of the plane. These colloidal micropropellers are composed by an ensemble of spinning rotors and can be readily used to entrap, transport, and release biological cargos on command via a hydrodynamic conveyor-belt effect. An efficient control of the cargo transportation combined with remarkable "healing" ability to surpass obstacles...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1601.00804

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5.0

Jun 27, 2018
06/18

by
Giovanni Barbero; Luiz Roberto Evangelista; Michely Patrícia Rosseto; Rafael Soares Zola; Ioannis Lelidis

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The twist-bend nematic phase, $N_{\rm TB}$, may be viewed as a heliconical molecular arrangement in which the director $\bf n$ precesses uniformly about an extra director field, $\bf t$. It corresponds to a nematic ground state exhibiting nanoscale periodic modulation. To demonstrate the stability of this phase from the elastic point of view, a natural extension of the Frank elastic energy density is proposed. The elastic energy density is built in terms of the elements of symmetry of the new...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1503.08775

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6.0

Jun 28, 2018
06/18

by
Hayato Shiba; Hiroshi Noguchi; Jean-Baptiste Fournier

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Three types of surface tensions can be defined for lipid membranes: the internal tension, $\sigma$, conjugated to the real membrane area in the Hamiltonian, the mechanical frame tension, $\tau$, conjugated to the projected area, and the "fluctuation tension", $r$, obtained from the fluctuation spectrum of the membrane height. We investigate these surface tensions by means of a Monge gauge lattice Monte Carlo simulation involving the exact, nonlinear, Helfrich Hamiltonian and a measure...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.08722

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Jun 30, 2018
06/18

by
G. L. Klimchitskaya; V. M. Mostepanenko; Bo E. Sernelius

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The comparison studies of theoretical approaches to the description of the Casimir interaction in layered systems including graphene is performed. It is shown that at zero temperature the approach using the polarization tensor leads to the same results as the approach using the longitudinal density-density correlation function of graphene. An explicit expression for the zero-temperature transverse density-density correlation function of graphene is provided. We further show that the...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.6886