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Jun 29, 2018
06/18

by
Hongjie An; Beng Hau Tan; Claus-Dieter Ohl

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The widespread application of surface-attached nanobubbles and nanodroplets in biomedical engineering and nanotechnology is limited by numerous experimental challenges, in particular, the possibility of contamination in nucleation experiments. These challenges are complicated by recent reports that it can be difficult to distinguish between nanoscale drops and bubbles. Here we identify clear differences in the mechanical responses of nanobubbles and nanodroplets under various modes of AFM...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.08162

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1.0

Jun 30, 2018
06/18

by
T. F. F. Farage; J. M. Brader

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Within the framework of mode-coupling theory, we present a simple model for describing dense assemblies of active (self-propelled) spherical colloidal particles. For isotropic suspensions, we demonstrate that the glass transition is shifted to higher volume fraction by the addition of activity, in agreement with recent Brownian dynamics simulations. Activity-induced changes in the static structure factor of the fluid are predicted. The mechanical response of an active glass to applied strain is...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.0928

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1.0

Jun 30, 2018
06/18

by
Takeshi Kawasaki; Daniele Coslovich; Atsushi Ikeda; Ludovic Berthier

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We use large scale computer simulations and finite size scaling analysis to study the shear rheology of dense three-dimensional suspensions of frictionless non-Brownian particles in the vicinity of the jamming transition. We perform simulations of soft repulsive particles at constant shear rate, constant pressure, and finite system size, and study carefully the asymptotic limits of large system sizes and infinitely hard particle repulsion. Extending earlier analysis by about two orders of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.5683

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2.0

Jun 27, 2018
06/18

by
Ingrid Ibagon; Markus Bier; S. Dietrich

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The three-phase contact line formed by the intersection of a liquid-vapor interface of an electrolyte solution with a charged planar substrate is studied in terms of classical density functional theory applied to a lattice model. The influence of the substrate charge density and of the ionic strength of the solution on the intrinsic structure of the three-phase contact line and on the corresponding line tension is analyzed. We find a negative line tension for all values of the surface charge...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1504.02657

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0.0

Jun 30, 2018
06/18

by
Felipe Torres; Dora Altbir; Miguel Kiwi

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The inclusion of a Dzyaloshinskii-Moriya short range antisymmetric interaction induces spontaneous magnetization, at nonzero temperatures, in one and two dimensions. It is shown that quantum fluctuations are reduced by the Dzyaloshinskii-Moriya interaction, but short range correlations are increased, thereby allowing to obtain long range magnetic order in these low dimensional systems.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.6505

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1.0

Jun 28, 2018
06/18

by
Shah H. Khan; Peter M. Hoffmann

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In this study, we present a detailed analysis of the squeeze-out dynamics of nanoconfined water confined between two hydrophilic surfaces measured by small-amplitude dynamic atomic force microscopy (AFM). Explicitly considering the instantaneous tip-surface separation during squeezeout, we confirm the existence of an adsorbed molecular water layer on mica and at least two hydration layers. We also confirm the previous observation of a sharp transition in the viscoelastic response of the...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.03246

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Jun 29, 2018
06/18

by
Karol Trojanowski; Michał Cieśla; Lech Longa

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We have studied the properties of biaxial particles interacting via an anisotropic pair potential, involving second rank quadrupolar and third rank octupolar coupling terms, using Monte Carlo simulation. The particles occupy the sites of a 2D square lattice and the interactions are restricted to nearest neighbours. The system exhibits spontaneous chiral symmetry breaking from an isotropic phase to a chiral modulated nematic phase, composed of ambidextrous chiral domains. When two-fold axes of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1607.02297

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0.0

Jun 29, 2018
06/18

by
Alessandro Lucantonio; Giuseppe Tomassetti; Antonio DeSimone

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We derive a large-strain plate model that allows to describe transient, coupled processes involving elasticity and solvent migration, by performing a dimensional reduction of a three-dimensional poroelastic theory. We apply the model to polymer gel plates, for which a specific kinematic constraint and constitutive relations hold. Finally, we assess the accuracy of the plate model with respect to the parent three-dimensional model through two numerical benchmarks, solved by means of the finite...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1607.02528

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1.0

Jun 29, 2018
06/18

by
Yu. A. Budkov; A. L. Kolesnikov

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We present a new simple self-consistent field theory of the polarizable flexible polymer chain under the external constant electric field with account for the many-body electrostatic dipole correlations. We show the effect of electrostatic dipole correlations on the electric field-induced globule-coil transition. We demonstrate that only when the polymer chain is in the coil conformation, the electrostatic dipole correlations of monomers can be considered as pairwise. However, when the polymer...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.05310

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0.0

Jun 29, 2018
06/18

by
Michel Destrade; Giuseppe Saccomandi; Ivonne Sgura

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A great variety of models can describe the non-linear response of rubber to uni-axial tension. Yet an in-depth understanding of the successive stages of large extension is still lacking. We show that the response can be broken down in three steps, which we delineate by relying on a simple formatting of the data, the so-called Mooney transform. First, the small-to-moderate regime, where the polymeric chains unfold easily and the Mooney plot is almost linear. Second, the strain-hardening regime,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.05801

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1.0

Jun 29, 2018
06/18

by
Merrell A. Johnson; Ricardo S. Decca

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Temperature controlled Polarization Modulation Near-Field Scanning Optical Microscopy (PM-NSOM) measurements of a single supported $L_{\beta^{\prime}}$ 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) lipid bilayer are presented. The effective retardance ($\Delta S = \frac{2 \pi (n_e-n_o)t}{\lambda}$), where $t$ is the thickness of the bilayer and $\lambda$ is the wavelength of light used and the direction of the projection of the acyl chains ($\theta $) were measured simultaneously. From...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.06623

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0.0

Jun 29, 2018
06/18

by
Erick de Moraes Franklin; Carlos Azael Alvarez Zambrano

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Gravitational flow of grains in pipes is frequently encountered in industry. When the grains and pipes are size-constrained, granular flow may result in density waves consisting of alternate high- and low-compactness regions. This paper discusses the length scale of density waves that appear when fine grains fall vertically in pipes. A one-dimensional model and a linear stability analysis of the model are presented. The analysis suggests the presence of long-wavelength instability for the most...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.08946

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0.0

Jun 30, 2018
06/18

by
Moritz Antlanger; Martial Mazars; Ladislav Šamaj; Gerhard Kahl; Emmanuel Trizac

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A planar array of identical charges at vanishing temperature forms a Wigner crystal with hexagonal symmetry. We take off one (reference) charge in a perpendicular direction, hold it fixed, and search for the ground state of the whole system. The planar projection of the reference charge should then evolve from a six-fold coordination (center of a hexagon) for small distances to a three-fold arrangement (center of a triangle), at large distances $d$ from the plane. The aim of this paper is to...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.8167

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1.0

Jun 30, 2018
06/18

by
S. I. Mukhin; B. B. Kheyfets

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Critical lateral pressure for a pore formation and phase diagram of porous membrane are derived analytically as functions of the microscopic parameters of the lipid chains. The derivation exploits path-integral calculation of the free energy of the ensembles of semi-flexible strings and rigid rods that mimic the hydrophobic tails of lipids in the lipid bilayers and bolalipid membranes respectively. Analytical expressions for the area stretch/compressibility moduli of the membranes are derived...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.1040

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5.0

Jun 30, 2018
06/18

by
Carl P. Goodrich; Andrea J. Liu; Sidney R. Nagel

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Packings of frictionless athermal particles that interact only when they overlap experience a jamming transition as a function of packing density. Such packings provide the foundation for the theory of jamming. This theory rests on the observation that, despite the multitude of disordered configurations, the mechanical response to linear order depends only on the distance to the transition. We investigate the validity and utility of such measurements that invoke the harmonic approximation and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.6206

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0.0

Jun 30, 2018
06/18

by
Sarmistha Sarkar; Rajib Biswas; Partha Pratim Ray; Biman Bagchi

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We use polydispersity in size as a control parameter to explore certain aspects of melting and freezing transitions in a system of Lennard-Jones spheres. Both analytical theory and computer simulations are employed to establish a potentially interesting relationship between observed terminal polydispersity in Lennard-Jones polydisperse spheres and prediction of the same in the integral equation based theoretical analysis of liquid-solid transition. As we increase polydispersity, solid becomes...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.6879

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0.0

Jun 30, 2018
06/18

by
Eric DeGiuli; Adrien Laversanne-Finot; Gustavo Düring; Edan Lerner; Matthieu Wyart

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Connectedness and applied stress strongly affect elasticity in solids. In various amorphous solids, mechanical stability can be lost either by reducing connectedness or by increasing pressure. We present an effective medium theory of elasticity that extends previous approaches by incorporating the effect of compression, of amplitude $e$, allowing one to describe quantitative features of sound propagation, transport, the boson peak, and elastic moduli near the elastic instability occurring at a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.6563

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1.0

Jun 30, 2018
06/18

by
Takahiro Sakaue; Françoise Brochard-Wyart

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We propose a novel characterization method of randomly branched polymers based on the geometrical property of such objects in confined spaces. The central idea is that randomly branched polymers exhibit passing/clogging transition across the nano-channel as a function of the channel size. This critical channel size depends on the degree of the branching, whereby allowing the extraction of the branching information of the molecule.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.8035

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0.0

Jun 30, 2018
06/18

by
Xipeng Wang; Wen Zheng; Lijin Wang; Ning Xu

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We probe the Ioffe-Regel limits of glasses with repulsions near the zero-temperature jamming transition by measuring the dynamical structure factors. At zero temperature, the transverse Ioffe-Regel frequency vanishes at the jamming transition with a diverging length, but the longitudinal one does not, which excludes the existence of a diverging length associated with the longitudinal excitations. At low temperatures, the transverse and longitudinal Ioffe-Regel frequencies approach zero at the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.0596

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0.0

Jun 30, 2018
06/18

by
Lorenzo Rovigatti; Nicoletta Gnan; Alberto Parola; Emanuela Zaccarelli

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We investigate binary mixtures of large colloids interacting through soft potentials with small, ideal depletants. We show that softness has a dramatic effect on the resulting colloid-colloid effective potential when the depletant-to-colloid size ratio $q$ is small, with significant consequences on the colloidal phase behaviour. We also provide an exact relation that allows us to obtain the effective pair potential for {\it any} type of colloid-depletant interactions in the case of ideal...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.0903

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0.0

Jun 30, 2018
06/18

by
S. Masoomeh Hashemi; Mohammad Reza Ejtehadi

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A continuum theory is employed to numerically study the equilibrium orientation and defect structures of a circular cylindrical particle with flat ends under a homeotropic anchoring condition in a uniform nematic medium. Different aspect ratios of this colloidal geometry from thin discotic to long rod-like shapes and several colloidal length scales ranging from mesoscale to nanoscale are investigated. We show that the equilibrium state of this colloidal geometry is sensitive to the two...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.1145

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0.0

Jun 30, 2018
06/18

by
Luca Giomi; Mark J. Bowick; Prashant Mishra; Rastko Sknepnek; M. Cristina Marchetti

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Topological defects are distinctive signatures of liquid crystals. They profoundly affect the viscoelastic behavior of the fluid by constraining the orientational structure in a way that inevitably requires global changes not achievable with any set of local deformations. In active nematic liquid crystals topological defects not only dictate the global structure of the director, but also act as local sources of motion, behaving as self-propelled particles. In this article we present a detailed...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.5254

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0.0

Jun 30, 2018
06/18

by
Ran Ni; Martien A. Cohen Stuart; Peter G. Bolhuis

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Using Brownian dynamics simulations, we systematically study the effective interaction between two parallel hard walls in a 2D suspension of self-propelled (active) colloidal hard spheres, and we find that the effective force between two hard walls can be tuned from a long range repulsion into a long range attraction by changing the density of active particles. At relatively high densities, the active hard spheres can form a dynamic crystalline bridge, which induces a strong oscillating long...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.1533

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0.0

Jun 30, 2018
06/18

by
Y. Wei; C. M. Cejas; R. Barrois; R. Dreyfus; D. J. Durian

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We visualize the formation of fingered flow in dry model sandy soils under different raining conditions using a quasi-2d experimental set-up, and systematically determine the impact of soil grain diameter and surface wetting property on water channelization phenomenon. The model sandy soils we use are random closely-packed glass beads with varied diameters and surface treatments. For hydrophilic sandy soils, our experiments show that rain water infiltrates into a shallow top layer of soil and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.3220

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0.0

Jun 30, 2018
06/18

by
Yanbiao Gan; Aiguo Xu; Guangcai Zhang; Junqi Wang; Xijun Yu; Yang Yang

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We present a highly efficient lattice Boltzmann (LB) kinetic model for thermal liquid-vapor system. Three key components are as beow: (i) a discrete velocity model by Kataoka \emph{et al.} [Phys. Rev. E \textbf{69}, 035701(R)(2004)]; (ii) a forcing term $I_{i}$ aiming to describe the interfacial stress and recover the van der Waals equation of state by Gonnella \emph{et al.} [Phys. Rev. E \textbf{76}, 036703 (2007)]; and (iii) a Windowed Fast Fourier Transform (WFFT) scheme and its inverse by...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.3746

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0.0

Jun 30, 2018
06/18

by
Aiguo Xu; Guangcai Zhang; Yanbiao Gan

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We further probe the Discrete Boltzmann Modeling(DBM) of the single-component two phase flows or the liquid-vapor system. There are two kinds of nonequilibrium effects in the system. The first is the Mechanical NonEquilibrium(MNE). The second is the Thermodynamic NonEquilibrium(TNE). The MNE is well described in the traditional fluid dynamic theory. The description of TNE resorts to the gas kinetic theory. Since based on the Boltzmann equation, the DBM makes possible to analyze both the MNE and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.3744

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0.0

Jun 30, 2018
06/18

by
T. F. Mohry; S. Kondrat; A. Maciolek; S. Dietrich

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Spatial confinement of a near-critical medium changes its fluctuation spectrum and modifies the corresponding order parameter distribution. These effects result in effective, so-called critical Casimir forces (CCFs) acting on the confining surfaces. These forces are attractive for like boundary conditions of the order parameter at the opposing surfaces of the confinement. For colloidal particles dissolved in a binary liquid mixture acting as a solvent close to its critical point of demixing,...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.5492

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0.0

Jun 30, 2018
06/18

by
Alexandre P. dos Santos; Yan Levin

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We study, using extensive Monte Carlos simulations, the behavior of cationic polyelectrolytes near hydrophobic surfaces in solutions containing Hofmeister salts. The Hofmeister anions are divided into kosmotropes and chaotropes. Near a hydrophobic surface, the chaotropes lose their solvation sheath and become partially adsorbed to the interface, while the kosmotropes remain strongly hydrated and are repelled from the interface. If the polyelectrolyte solution contains chaotropic anions, a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.6208

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0.0

Jun 30, 2018
06/18

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

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The short-range attraction and long-range repulsion (SALR) between nanoparticles or macromolecules can lead to spontaneous pattern formation on solid surfaces, fluid interfaces or membranes. In order to study the self-assembly in such systems we consider a triangular lattice model with nearest-neighbour attraction and third-neighbour repulsion. At the ground state of the model ($T=0$) the lattice is empty for small values of the chemical potential $\mu$, and fully occupied for large $\mu$. For...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.0801

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0.0

Jun 30, 2018
06/18

by
Kazuhiko Seki; Saurabh Mogre; Shigeyuki Komura

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We study diffusion coefficients of liquid domains by explicitly taking into account the two-layered structure called leaflets of the bilayer membrane. In general, the velocity fields associated with each leaflet are different and the layers sliding past each other cause frictional coupling. We obtain analytical results of diffusion coefficients for a circular liquid domain in a leaflet, and quantitatively study their dependence on the inter-leaflet friction. We also show that the diffusion...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.0920

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0.0

Jun 30, 2018
06/18

by
Lorène Champougny; Benoit Scheid; Frédéric Restagno; Jan Vermant; Emmanuelle Rio

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The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.4640

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0.0

Jun 30, 2018
06/18

by
TirumalaRao Kotni; Jayati Sarkar; Rajesh Khanna

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Numerical simulations of spontaneous dewetting of non-slipping, variable viscosity unstable thin liquid films on homogeneous substrates reveal the existence of sub-spinodal lengthscales through formation of satellite holes, a marker of nucleated dewetting and/or heterogeneous substrates, in the late stages of dewetting if the liquid viscosity decreases continually with decreasing film thickness. These films also show established signatures of slipping films such as faster rupture and flatter...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.2556

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0.0

Jun 30, 2018
06/18

by
Sebastian Knoche; Jan Kierfeld

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When a spherical elastic capsule is deflated, it first buckles axisymmetrically and subsequently loses its axisymmetry in a secondary instability, where the dimple acquires a polygonal shape. We explain this secondary polygonal buckling in terms of wrinkles developing at the inner side of the dimple edge in response to compressive hoop stress. Analyzing the axisymmetric buckled shape, we find a compressive hoop stress with parabolic stress profile at the dimple edge. We further show that there...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.3202

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1.0

Jun 30, 2018
06/18

by
Marcello Sega; Sofia Kantorovich; Christian Holm; Axel Arnold

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Understanding dielectric spectra can reveal important information about the dynamics of solvents and solutes from the dipolar relaxation times down to electronic ones. In the late 1970s, Hubbard and Onsager predicted that adding salt ions to a polar solution would result in a reduced dielectric permittivity that arises from the unexpected tendency of solvent dipoles to align opposite to the applied field. So far, this effect has escaped an experimental verification, mainly because of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1404.1012

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0.0

Jun 30, 2018
06/18

by
Joshua B. Bostwick; Michael Shearer; Karen E. Daniels

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A partially-wetting liquid can deform the underlying elastic substrate upon which it rests. This situation requires the development of theoretical models to describe the wetting forces imparted by the drop onto the solid substrate, particularly those at the contact-line. We construct a general solution using a displacement potential function for the elastic deformations within a finite elastic substrate associated with these wetting forces, and compare the results for several different...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.0066

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0.0

Jun 30, 2018
06/18

by
Wence Xiao; Jon Tofteskov; Troels V. Christensen; Jeppe C. Dyre; Kristine Niss

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This paper derives a prediction for the variation of the amplitude of the dielectric loss from isomorph theory, and presents an experimental test of the prediction performed by measuring the dielectric-relaxation behavior of the van der Waals liquid 5-phenyl-4-ether (5PPE). The liquid is studied at isochronal states in the temperature range $266-333$ K and pressure range $0.1-300$ MPa, for relaxation times around $10^{-3}$ s and $10^{-4}$ s. From the isomorph statement that there is structural...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.6098

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3.0

Jun 28, 2018
06/18

by
Valerio Mazzone; Simone Melchionna; Umberto Marini Bettolo Marconi

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Ionic currents accompanying DNA translocation strongly depend on molarity of the electrolyte solution and the shape and surface charge of the nanopore. By means of the Poisson-Nernst-Planck equations it is shown how conductance is modulated by the presence of the DNA intruder and as a result of competing electrostatic and confinement factors. The theoretical results reproduce quantitatively the experimental ones and are summarized in a conductance diagram that allows distinguishing the region...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1507.04160

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3.0

Jun 28, 2018
06/18

by
V. I. Marchenko; E. R. Podolyak

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It is shown that the model proposed by Canham quantitatively describes the observed biconcave shape of human erythrocytes.

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1506.05939

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0.0

Jun 29, 2018
06/18

by
N S K Kumar; G Govindaraj; U Sailaja

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The molecular mobility of glassy and supercooled liquid states of clotrimazole is studied using broadband dielectric spectroscopy for a wide range of temperatures and frequency. The dielectric loss data of clotrimazole below T$_{g}$, do not show well resolved relaxation. Above T$_{g}$, dielectric loss show the structural $\alpha$-relaxation which is reformed to shoulder like shape at high frequencies due to the secondary relaxation. The relaxation time of $\alpha$-process, $\tau_{\alpha}$...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.02649

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Jun 30, 2018
06/18

by
Viktoria Blavatska; Ralf Metzler

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Multiple loop formation in polymer macromolecules is an important feature of the chromatin organization and DNA compactification in the nuclei. We analyze the size and shape characteristics of complex polymer structures, containing in general $f_1$ loops (petals) and $f_2$ linear chains (branches). Within the frames of continuous model of Gaussian macromolecule, we apply the path integration method and obtain the estimates for gyration radius $R_g$ and asphericity $\hat{A}$ of typical...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.2553

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Jun 30, 2018
06/18

by
Gautier Lefebvre; Pierre Jop

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Liquid may give strong cohesion properties to a granular medium, and confer a solid-like behavior. We study the erosion of a fixed circular aggregate of wet granular matter subjected to a flow of dry grains inside a half-filled rotating drum. During the rotation, the dry grains flow around the fixed obstacle. We show that its diameter decreases linearly with time for low liquid content, as wet grains are pulled-out of the aggregate. This erosion phenomenon is governed by the properties of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.2631

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Jun 30, 2018
06/18

by
A. Iakovlev; D. Bedrov; M. Müller

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Motivated by an experimental interest we investigate by the means of atomistic Molecular Dynamics simulation the ability of density-independent, empiric density-dependent, and recently proposed embedded-atom force fields for liquid mercury to predict the surface tension of the free surface of liquid mercury at the temperature of 293~K. The effect of the density dependence of the studied models on the liquid-vapor coexistence and surface tension is discussed in detail. In view of computational...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.2805

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1.0

Jun 30, 2018
06/18

by
Hugh D. Newman; Anand Yethiraj

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In this work, we use structure and dynamics in sedimentation equilibrium, in the presence of gravity, to examine, $via$ confocal microscopy, a Brownian colloidal system in the presence of an external electric field. The zero field equation of state (EOS) is hard sphere without any re-scaling of particle size, and the hydrodynamic corrections to the long-time self-diffusion coefficient are quantitatively consistent with the expected value for hard spheres. Care is taken to ensure that both the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.3190

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2.0

Jun 26, 2018
06/18

by
Wolf B. Dapp; Martin H. Müser

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We study numerically local models for the mechanical contact between two solids with rough surfaces. When the solids softly touch either through adhesion or by a small normal load $L$, contact only forms at isolated patches and fluids can pass through the interface. When the load surpasses a threshold value, $L_c$, adjacent patches coalesce at a critical constriction, i.e., near points where the interfacial separation between the undeformed surfaces forms a saddle point. This process is...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1501.06290

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0.0

Jun 27, 2018
06/18

by
G. E. Volovik

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The paper by Landau and Lifshitz on vortex sheets in rotating superfluid appeared in 1955 almost at the same time when Feynman published his paper on quantized vortices in superfluid 4He. For a long time this paper has been considered as an error. But 40 years later the vortex sheets have been detected in chiral superfluid 3He-A in the rotating cryostat constructed in the Olli Lounasmaa Low Temperature Laboratory (Otaniemi, Finland). The equation derived by Landau and Lifshits for the distance...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1504.00336

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0.0

Jun 27, 2018
06/18

by
S. O. Diallo

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The temperature dependence of the dynamics of water inside microporous activated carbon fibers (ACF) is investigated by means of incoherent elastic and quasi- elastic neutron scattering techniques. The aim is to evaluate the effect of increasing pore size on the water dynamics in these primarily hydrophobic slit-shaped channels. Using two different micropore sizes (\sim 12 and 18 {\AA}, denoted respectively ACF-10 and ACF-20), a clear suppression of the mobility of the water molecules is...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1504.00426

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0.0

Jun 27, 2018
06/18

by
Camille Scalliet; Andrea Gnoli; Andrea Puglisi; Angelo Vulpiani

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A vertically shaken granular medium hosts a blade rotating around a fixed vertical axis, which acts as a mesorheological probe. At high densities, independently from the shaking intensity, the blade's dynamics show strong caging effects, marked by transient sub-diffusion and a maximum in the velocity power density spectrum (vpds), at a resonant frequency $\sim 10$ Hz. Interpreting the data through a diffusing harmonic cage model allows us to retrieve the elastic constant of the granular medium...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1504.07528

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0.0

Jun 29, 2018
06/18

by
Andrea Gnoli; Antonio Lasanta; Alessandro Sarracino; Andrea Puglisi

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Granular media take on great importance in industry and geophysics, posing a severe challenge to materials science. Their response properties elude known soft rheological models, even when the yield-stress discontinuity is blurred by vibro-fluidization. Here we propose a broad rheological scenario where average stress sums up a frictional contribution, generalizing conventional $\mu(I)$-rheology, and a kinetic collisional term dominating at fast fluidization. Our conjecture fairly describes a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.03374

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1.0

Jun 29, 2018
06/18

by
Junbo Zhu; Zhu Chen; Biao Wu

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We present a general method of constructing maximally localized Wannier functions. It consists of three steps: (1) picking a localized trial wave function, (2) performing a full band projection, and (3) orthonormalizing with the Lowdin method. Our method is capable of producing maximally localized Wannier functions without further minimization, and it can be applied straightforwardly to random potentials without using supercells. The effectiveness of our method is demonstrated for both simple...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1609.05992

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0.0

Jun 29, 2018
06/18

by
Ivan Shishkin; Tmiron Alon; Ronen Dagan; Pavel Ginzburg

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Local environment of fluorescent dyes could strongly affect emission dynamics of the latter. In particular, both signal intensities and emission lifetimes are highly sensitive to solvent temperatures. Here, temperature-dependent behavior Rhodamine B fluorescence in water and ethanol solutions was experimentally investigated. Phase transition point of liquid water to ice was shown to have a dramatic impact on both in intensity (30-fold drop) and in lifetime (from 2.68ns down to 0.13ns) of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.09284