12
12
Jun 28, 2018
06/18
by
L. Staron; J. C. Phillips
texts
eye 12
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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
11
11
Jun 27, 2018
06/18
by
Robert Großmann; Pawel Romanczuk; Markus Bär; Lutz Schimansky-Geier
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eye 11
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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
Abdullah Cakir; Massimo Pica Ciamarra
texts
eye 3
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comment 0
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
5
5.0
Jun 29, 2018
06/18
by
N. S. K. Kumar; G. Govindaraj; U. Sailaja
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eye 5
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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
4
4.0
Jun 28, 2018
06/18
by
Maxime Lanoy; Romain Pierrat; Fabrice Lemoult; Mathias Fink; Valentin Leroy; Arnaud Tourin
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eye 4
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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
3
3.0
Jun 29, 2018
06/18
by
V. A. Andryushchenko; L. P. Kondaurova; S. K. Nemirovskii
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eye 3
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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
8
8.0
Jun 29, 2018
06/18
by
N. Manini; O. M. Braun; E. Tosatti; R. Guerra; A. Vanossi
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eye 8
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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
6
6.0
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 6
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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
7
7.0
Jun 27, 2018
06/18
by
Riccardo Artoni; Patrick Richard
texts
eye 7
favorite 0
comment 0
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
4
4.0
Jun 29, 2018
06/18
by
Sébastien Fumeron; Erms Pereira; Fernando Moraes
texts
eye 4
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comment 0
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
3
3.0
Jun 29, 2018
06/18
by
Julian Geske; Barbara Drossel; Michael Vogel
texts
eye 3
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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
16
16
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 16
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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
9
9.0
Jun 26, 2018
06/18
by
Abdullah Cakir; Leonardo E. Silbert
texts
eye 9
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The mechanical response of static, unconfined, overcompressed face centred cubic, granular arrays is studied using large-scale, discrete element method simulations. Specifically, the stress response due to the application of a localised force perturbation - the Green function technique - is obtained in granular packings generated over several orders of magnitude in both the particle friction coefficient and the applied forcing. We observe crossover behaviour in the mechanical state of the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1502.07146
14
14
Jun 27, 2018
06/18
by
Liana Vaccari; Daniel Allan; Nima Sharifi-Mood; Aayush Singh; Robert Leheny; Kathleen Stebe
texts
eye 14
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Bacterial attachment to a fluid interface can lead to the formation of a film with physicochemical properties that evolve with time. We study the time evolution of interface (micro)mechanics for interfaces between oil and bacterial suspensions by following the motion of colloidal probes trapped by capillarity to determine the interface microrheology. Initially, active bacteria at and near the interface drive superdiffusive motion of the colloidal probes. Over timescales of minutes, the bacteria...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1503.07255
9
9.0
Jun 29, 2018
06/18
by
Erick de Moraes Franklin; Carlos Azael Alvarez Zambrano
texts
eye 9
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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
8
8.0
Jun 29, 2018
06/18
by
H. -J. Schmidt; C. Schröder; M. Luban
texts
eye 8
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We theoretically and numerically investigate spin waves that occur in systems of classical magnetic dipoles that are arranged at the vertices of a regular polygon and interact solely via their magnetic fields. There are certain limiting cases that can be analyzed in detail. One case is that of spin waves as infinitesimal excitations from the system's ground state, where the dispersion relation can be determined analytically. The frequencies of these infinitesimal spin waves are compared with...
Topics: Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1609.07264
8
8.0
Jun 29, 2018
06/18
by
Tomoyuki Mano; Jean-Baptiste Delfau; Masaki Sano
texts
eye 8
favorite 0
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Even though making artificial micrometric swimmers has been made possible by using various propulsion mechanisms, guiding their motion in the presence of thermal fluctuations still remains a great challenge. Such a task is essential in biological systems, which present a number of intriguing solutions that are robust against noisy environmental conditions as well as variability in individual genetic makeup. Using synthetic Janus particles driven by an electric field, we present a feedback-based...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1610.01485
6
6.0
Jun 29, 2018
06/18
by
Andrew Callan-Jones; Marc Durand; Jean-Baptiste Fournier
texts
eye 6
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comment 0
We consider the hydrodynamics of lipid bilayers containing transmembrane proteins of arbitrary shape. This biologically-motivated problem is relevant to the cell membrane, whose fluctuating dynamics play a key role in phenomena ranging from cell migration, intercellular transport, and cell communication. Using Onsager's variational principle, we derive the equations that govern the relaxation dynamics of the membrane shape, of the mass densities of the bilayer leaflets, and of the diffusing...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1610.02384
6
6.0
Jun 29, 2018
06/18
by
Rangarajan Radhakrishnan; Thibaut Divoux; Sébastien Manneville; Suzanne M. Fielding
texts
eye 6
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Motivated by recent experimental studies of rheological hysteresis in soft glassy materials, we study numerically strain rate sweeps in simple yield stress fluids and viscosity bifurcating yield stress fluids. Our simulations of downward followed by upward strain rate sweeps, performed within fluidity models and the soft glassy rheology model, successfully capture the experimentally observed monotonic decrease of the area of the rheological hysteresis loop with sweep time in simple yield stress...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1611.03148
7
7.0
Jun 29, 2018
06/18
by
Anoosheh Yazdi; Matthias Sperl
texts
eye 7
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comment 0
We consider a two-dimensional model system of Brownian particles in which slow particles are accelerated while fast particles are damped. The motion of the individual particles are described by a Langevin equation with Rayleigh-Helmholtz velocity dependent friction. In case of noninteracting particles, the time evolution equations lead to a non-Gaussian velocity distribution. The velocity dependent friction allows negative values of the friction or energy intakes by slow particles which we...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1608.03162
8
8.0
Jun 29, 2018
06/18
by
Tamás Börzsönyi; Ellák Somfai; Balázs Szabó; Sandra Wegner; Pascal Mier; Georg Rose; Ralf Stannarius
texts
eye 8
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Granular material flowing through bottlenecks like the openings of silos tend to clog and to inhibit further flow. We study this phenomenon in a three-dimensional hopper for spherical and shape-anisotropic particles by means of X-ray tomography. The X-ray tomograms provide information on the bulk of the granular filling, and allows to determine the particle positions and orientations inside the silo. In addition, it allows to calculate local packing densities in different parts of the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1609.02752
3
3.0
Jun 29, 2018
06/18
by
M. Borówko; A. Patrykiejew; W. Rzysko; S. Sokołowski
texts
eye 3
favorite 0
comment 0
The first-order phase transitions in the lattice model of Janus-like particles confined in slit-like pores are studied. We assume a cubic lattice with molecules that can freely change their orientation on a lattice site. Moreover, the molecules can interact with the pore walls with orientation-dependent forces. The performed calculations are limited to the cases of bilayers. Our emphasis is on the competition between the fluid-wall and fluid-fluid interactions. The oriented structures formed in...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1609.04706
16
16
Jun 27, 2018
06/18
by
Doru Constantin; Éric Freyssingeas; Jean-François Palierne; Patrick Oswald
texts
eye 16
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We study the structural changes occurring in the isotropic phase of the C$_{12}$=EO$_6$/H$_2$O lyotropic mixture (up to 35% surfactant weight concentration) upon increasing the concentration and temperature, from small individual micelles to an entangled network which subsequently becomes connected. High-frequency (up to $\omega = 6 \times 10^4$ rad/s) rheological measurements give us access to the viscoelastic relaxation spectrum, which can be well described by the sum of two Maxwell models...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1504.01843
31
31
Jun 27, 2018
06/18
by
Tyler N. Shendruk; Julia M. Yeomans
texts
eye 31
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Research on transport, self-assembly and defect dynamics within confined, flowing liquid crystals requires versatile and computationally efficient mesoscopic algorithms to account for fluctuating nematohydrodynamic interactions. We present a multi-particle collision dynamics (MPCD) based algorithm to simulate liquid-crystal hydrodynamic and director fields in two and three dimensions. The nematic-MPCD method is shown to successfully reproduce the features of a nematic liquid crystal, including...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1504.04745
16
16
Jun 27, 2018
06/18
by
Alexander L. Dubov; Ahmed Mourran; Martin Möller; Olga I. Vinogradova
texts
eye 16
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We discuss an evaporation-induced wetting transition on superhydrophobic stripes, and show that depending on the elastic energy of the deformed contact line, which determines the value of an instantaneous effective contact angle, two different scenarios occur. For relatively dilute stripes the receding angle is above 90$^\circ$, and the sudden impalement transition happens due to an increase of a curvature of an evaporating drop. For dense stripes the slow impregnation transition commences when...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1505.02933
3
3.0
Jun 28, 2018
06/18
by
Abram H. Clark; Lou Kondic; Robert P. Behringer
texts
eye 3
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comment 0
We study experimentally and computationally the dynamics of granular flow during impacts, where intruders strike a collection of disks from above. In the regime where granular force dynamics are much more rapid than the intruder motion, we find that the particle flow near the intruder is proportional to the instantaneous intruder speed; it is essentially constant when normalized by that speed. The granular flow is nearly divergence-free and remains in balance with the intruder, despite the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1510.01680
4
4.0
Jun 28, 2018
06/18
by
Paul Mort
texts
eye 4
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comment 0
This paper describes methods to measure flow rate and jamming onset of granules discharged through a flat-bottom cylindrical hopper with a circular orifice. The intrinsic jamming onset for ideal particles (spherical, monodisperse, smooth) is experimentally measured by two independent methods, with good agreement. For non-ideal particles, the normalized jamming onset increases with elongated granule shape, broadened size distribution and increased friction as measured by the drained angle of...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1510.04534
5
5.0
Jun 29, 2018
06/18
by
Wei Kang Lim; Alan R. Denton
texts
eye 5
favorite 0
comment 0
Depletion-induced interactions between colloids in colloid-polymer mixtures depend in range and strength on size, shape, and concentration of depletants. Crowding by colloids in turn affects shapes of polymer coils, such as biopolymers in biological cells. By simulating hard-sphere colloids and random-walk polymers, modeled as fluctuating ellipsoids, we compute depletion-induced potentials and polymer shape distributions. Comparing results with exact density-functional theory calculations,...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1601.00030
5
5.0
Jun 29, 2018
06/18
by
Ishan Srivastava; Timothy S. Fisher
texts
eye 5
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Creep mechanisms in uniaxially compressed 3D granular solids comprised of faceted frictionless grains are studied numerically using a constant pressure and constant stress simulation method. Rapid uniaxial compression followed by slow dilation is predicted on the basis of a logarithmic creep phenomenon. Micromechanical analysis indicates the existence of a correlation between granular creep and grain-scale deformations. Localized regions of large strain appear during creep and grow in magnitude...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.07403
6
6.0
Jun 29, 2018
06/18
by
T. Janc; M. Kastelic; M. Boncina; V. Vlachy
texts
eye 6
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comment 0
The effects of additions of low-molecular-mass salts on the properties of aqueous lysozyme solutions are examined by using the cloud-point temperature, $T_{cloud}$, measurements. Mixtures of protein, buffer, and simple salt in water are studied at pH=6.8 (phosphate buffer) and pH=4.6 (acetate buffer). We show that an addition of buffer in the amount above $I_{buffer} = 0.6$ mol dm$^{-3}$ does not affect the $T_{cloud}$ values. However, by replacing a certain amount of the buffer electrolyte by...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.07114
6
6.0
Jun 29, 2018
06/18
by
Bekele J. Gurmessa; Andrew B. Croll
texts
eye 6
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Polymer glasses have numerous advantageous mechanical properties in comparison to other materials. One of the most useful is the high degree of toughness that can be achieved due to significant yield occurring in the material. Remarkably, the onset of plasticity in polymeric materials is very poorly quantified, despite its importance as the ultimate limit of purely elastic behavior. Here we report the results of a novel experiment which is extremely sensitive to the onset of yield and discuss...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1604.06173
4
4.0
Jun 29, 2018
06/18
by
Andreas Härtel; Sela Samin; Rene van Roij
texts
eye 4
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comment 0
The ongoing scientific interest in the properties and structure of electric double layers (EDLs) stems from their pivotal role in (super)capacitive energy storage, energy harvesting, and water treatment technologies. Classical density functional theory (DFT) is a promising framework for the study of the in- and out-of-plane structural properties of double layers. Supported by molecular dynamics simulations, we demonstrate the adequate performance of DFT for analyzing charge layering in the EDL...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1604.07965
10
10.0
Jun 29, 2018
06/18
by
Sergei Nechaev; Kirill Polovnikov
texts
eye 10
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Optimal embedding in the three-dimensional space of exponentially growing squeezed surfaces, like plants leaves, or 2D colonies of exponentially reproducing cells, is considered in the framework of conformal approach. It is shown that the boundary profile of a growing tissue is described by the 2D eikonal equation, which provides the geometric optic approximation for the wave front propagating in the media with inhomogeneous refraction coefficient. The variety of optimal surfaces embedded in 3D...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1605.04547
4
4.0
Jun 30, 2018
06/18
by
Matteo Amabili; Alberto Giacomello; Simone Meloni; Carlo Massimo Casciola
texts
eye 4
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comment 0
The mechanism of the collapse of the superhydrophobic state is elucidated for submerged nanoscale textures forming a three-dimensional interconnected vapor domain. This key issue for the design of nanotextures poses significant simulation challenges as it is characterized by diverse time and length scales. State-of-the-art atomistic rare events simulations are applied for overcoming the long time scales connected with the large free energy barriers. In such interconnected surface cavities...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1703.10389
6
6.0
Jun 30, 2018
06/18
by
E. DeGiuli; M. Wyart
texts
eye 6
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comment 0
The macroscopic friction of particulate materials often weakens as the flow rate is increased, leading to potentially disastrous intermittent phenomena including earthquakes and landslides. We theoretically and numerically study this phenomenon in simple granular materials. We show that velocity-weakening, corresponding to a non-monotonic behavior in the friction law $\mu(I)$, is present even if the dynamic and static microscopic friction coefficients are identical, but disappears for softer...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1704.00740
6
6.0
Jun 30, 2018
06/18
by
Muhammad Anwar; Joshua T. Berryman; Tanja Schilling
texts
eye 6
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We present a molecular dynamics simulation study of crystal nucleation from undercooled melts of n-alkanes, and we identify the molecular mechanism of homogeneous crystal nucleation under quiescent conditions and under shear flow. We compare results for n-eicosane(C20) and n-pentacontahectane(C150), i.e. one system below the entanglement length and one above. Under quiescent conditions, we observe that entanglement does not have an effect on the nucleation mechanism. For both chain lengths, the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1407.1892
6
6.0
Jun 30, 2018
06/18
by
J. B. Sokoloff
texts
eye 6
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comment 0
It is demonstrated that polymers sticking out of the surface of a neutral hydrogel are capable of preventing adhesive forces from pulling a hydrogel into close contact with a surface against which it is pressed. The proposed mechanism for lubrication or surface protection suggests a possible mechanism for protecting the cornea from a contact lens, which is held against the eye by Laplace pressure. This mechanism, however, is only able to keep a gel coated surface from sticking to a surface...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1409.5374
6
6.0
Jun 30, 2018
06/18
by
Francesco Turci; Tanja Schilling; Mohammad Hossein Yamani; Martin Oettel
texts
eye 6
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We review theoretical and simulational approaches to the description of equilibrium bulk crystal and interface properties as well as to the nonequilibrium processes of homogeneous and heterogeneous crystal nucleation for the simple model systems of hard spheres and Lennard-Jones particles. For the equilibrium properties of bulk and interfaces, density functional theories employing fundamental measure functionals prove to be a precise and versatile tool, as exemplified with a closer analysis of...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1401.8133
7
7.0
Jun 30, 2018
06/18
by
S. B. Chernyshuk; O. M. Tovkach; B. I. Lev
texts
eye 7
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We predict theoretically the existence of a class of colloidal structures in nematic liquid crystal (NLC) cells, which are induced by surface patterns on the plates of the cell (like cells with UV-irradiated polyimide surfaces using micron size masks). These bulk structures arise from non-zero boundary conditions for the director distortions at the confining surfaces. In particular, we demonstrate that quadrupole spherical particles (like spheres with boojums or Saturn-ring director...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1405.7878
8
8.0
Jun 30, 2018
06/18
by
T. Tóth-Katona; P. Salamon; N. Éber; N. Tomašovičová; Z. Mitróová; P. Kopčanský
texts
eye 8
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We investigated experimentally the magneto-optical and dielectric properties of magnetic-nanoparticle-doped nematic liquid crystals (ferronematics). Our studies focus on the effect of the very small orienting bias magnetic field $B_{bias}$, and that of the nematic director pretilt at the boundary surfaces in our systems sensitive to low magnetic fields. Based on the results we assert that $B_{bias}$ is not necessarily required for a detectable response to low magnetic fields, and that the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1409.1723
9
9.0
Jun 30, 2018
06/18
by
Gennady V. Kovalev
texts
eye 9
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comment 0
The motion of channeled particles is accompanied by the phonon emission. This feature can be used for the stimulated generation of phonons with large wave vectors and frequencies.
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1411.1724
4
4.0
Jun 30, 2018
06/18
by
Rituparno Mandal; Pranab Jyoti Bhuyan; Madan Rao; Chandan Dasgupta
texts
eye 4
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comment 0
Dense soft glasses show strong collective caging behavior at sufficiently low temperatures. Using molecular dynamics simulations of a model glass former, we show that the incorporation of activity or self-propulsion, f0, can induce cage breaking and fluidization, resulting in a disappearance of the glassy phase beyond a critical f0 . The diffusion coefficient crosses over from being strongly to weakly temperature dependent as f0 is increased. In addition, we demonstrate that activity induces a...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1412.1631
15
15
Jun 27, 2018
06/18
by
Keevin Béneut; Doru Constantin; Patrick Davidson; Arnaud Dessombz; Corinne Chanéac
texts
eye 15
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The dilute lamellar phase of the nonionic surfactant C$_{12}$EO$_5$ was doped with goethite (iron oxide) nanorods up to a fraction of 5 vol. %. The interaction between the inclusions and the host phase was studied by polarized optical microscopy (with or without an applied magnetic field) and by small-angle X-ray scattering. We find that, when the orientation of the nanorods is modified using the magnetic field, the texture of the lamellar phase changes accordingly; one can thus induce a...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1504.02879
11
11
Jun 27, 2018
06/18
by
Elliot Jenner; Brian D'Urso
texts
eye 11
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comment 0
An absolute measurement of the components of the shear rate tensor $\mathcal{S}$ in a fluid can be found by measuring the photon correlation function of light scattered from particles in the fluid. Previous methods of measuring $\mathcal{S}$ involve reading the velocity at various points and extrapolating the shear, which can be time consuming and is limited in its ability to examine small spatial scale or short time events. Previous work in Photon Correlation Spectroscopy has involved only...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1505.02050
10
10.0
Jun 27, 2018
06/18
by
Janaina G. de Castro; Rojman Zargar; Mehdi Habibi; Samet H. Varol; Sapun H. Parekh; Babak Hosseinkhani; Mokhtar Adda-Bedia; Daniel Bonn
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Polymer composite materials are widely used for their exceptional mechanical properties, notably their ability to resist large deformations. Here we examine the failure stress and strain of rubbers reinforced by varying amounts of nano-sized silica particles. We find that small amounts of silica increase the fracture stress and strain, but too much filler makes the material become brittle and consequently fracture happens at small deformations. We thus find that as a function of the amount of...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1506.00832
18
18
Jun 27, 2018
06/18
by
Loren Jørgensen; Marie Le Merrer; Hélène Delanoë-Ayari; Catherine Barentin
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We have performed surface tension measurements on carbopol gels of different concentrations and yield stresses. Our setup, based on the force exerted by a capillary bridge on two parallel plates, allows to measure an effective surface tension of the complex fluid and to investigate the influence of flow history. More precisely the effective surface tension measured after stretching the bridge is always higher than after compressing it. The difference between the two values is due to the...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1506.01622
12
12
Jun 27, 2018
06/18
by
Nishant Kumar; Stefan Luding; Vanessa Magnanimo
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Physical experiments can characterize the elastic response of granular materials in terms of macroscopic state-variables, namely volume (packing) fraction and stress, while the microstructure is not accessible and thus neglected. Here, by means of numerical simulations, we analyze dense, frictionless, granular assemblies with the final goal to relate the elastic moduli to the fabric state, i.e., to micro-structural averaged contact network features as contact number density and anisotropy. The...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1506.02992
5
5.0
Jun 28, 2018
06/18
by
Rodrigo Lugo-Frias; Sabine H. L. Klapp
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This paper is concerned with the dynamics of a binary mixture of rod--like, repulsive colloidal particles driven out of equilibrium by means of a steady shear flow (Couette geometry). To this end we first derive, starting from a microscopic density functional in Parsons--Lee approximation, a mesoscopic free energy functional whose main variables are the orientational order parameter tensors. Based on this mesoscopic functional we then explore the stability of isotropic and nematic equilibrium...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1511.07691
12
12
Jun 27, 2018
06/18
by
Xia Hong; Kenneth W. Desmond; Dandan Chen; Eric R. Weeks
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We experimentally study the flow of a quasi-two-dimensional emulsion through a constricting hopper shape. Our area fractions range from 0.83 to 0.99, such that the droplets are always in contact with one another and are in many cases highly deformed. At the lowest flow rates, the droplets exit the hopper via intermittent avalanches. At the highest flow rates, the droplets exit continuously. The transition between these two types of behaviors is a fairly smooth function of the mean strain rate....
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1503.07569
5
5.0
Jun 30, 2018
06/18
by
Balazs Szabo; Janos Torok; Ellak Somfai; Sandra Wegner; Ralf Stannarius; Axel Bose; Georg Rose; Frank Angenstein; Tamas Borzsonyi
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The evolution of wide shear zones (or shear bands) was investigated experimentally and numerically for quasistatic dry granular flows in split bottom shear cells. We compare the behavior of materials consisting of beads, irregular grains (e.g. sand) and elongated particles. Shearing an initially random sample, the zone width was found to significantly decrease in the first stage of the process. The characteristic shear strain associated with this decrease is about unity and it is systematically...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1407.4976
