18
18

Jun 28, 2018
06/18

by
Amarin G. McDonnell; Naveen N. Jason; Leslie Y. Yeo; James R. Friend; Wenlong Cheng; Ranganathan Prabhakar

texts

#
eye 18

#
favorite 0

#
comment 0

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

5
5.0

Jun 29, 2018
06/18

by
Julian Geske; Barbara Drossel; Michael Vogel

texts

#
eye 5

#
favorite 0

#
comment 0

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

6
6.0

Jun 29, 2018
06/18

by
Sébastien Fumeron; Erms Pereira; Fernando Moraes

texts

#
eye 6

#
favorite 0

#
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

10
10.0

Jun 27, 2018
06/18

by
Riccardo Artoni; Patrick Richard

texts

#
eye 10

#
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

5
5.0

Jun 29, 2018
06/18

by
Abdullah Cakir; Massimo Pica Ciamarra

texts

#
eye 5

#
favorite 0

#
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

8
8.0

Jun 30, 2018
06/18

by
A. Vigentini; B. Van Hattem; E. Diato; P. Ponzellini; T. Meledina; A. Vanossi; G. Santoro; E. Tosatti; N. Manini

texts

#
eye 8

#
favorite 0

#
comment 0

Recent highly idealized model studies of lubricated nanofriction for two crystalline sliding surfaces with an interposed thin solid crystalline lubricant layer showed that the overall relative velocity of the lubricant $v_{\rm lub} / v_{\rm slider}$ depends only on the ratio of the lattice spacings, and retains a strictly constant value even when system parameters are varied within a wide range. This peculiar "quantized" dynamical locking was understood as due to the sliding-induced...

Topics: Soft Condensed Matter, Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.4290

7
7.0

Jun 29, 2018
06/18

by
D. V. Stäger; H. J. Herrmann

texts

#
eye 7

#
favorite 0

#
comment 0

Any space-filling packing of spheres can be cut by a plane to obtain a space-filling packing of disks. Here, we deal with space-filling packings generated using inversive geometry leading to exactly self-similar fractal packings. First, we prove that cutting along a random hyperplane leads in general to a packing with a fractal dimension of the one of the uncut packing minus one. Second, we find special cuts which can be constructed themselves by inversive geometry. Such special cuts have...

Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1609.03811

7
7.0

Jun 29, 2018
06/18

by
Abdul N. Malmi-Kakkada; Oriol T. Valls; Chandan Dasgupta

texts

#
eye 7

#
favorite 0

#
comment 0

We calculate the dislocation glide mobility in solid $^4$He within a model that assumes the existence of a superfluid field associated with dislocation lines. Prompted by the results of this mobility calculation, we study within this model the role that such a superfluid field may play in the motion of the dislocation line when a stress is applied to the crystal. To do this, we relate the damping of dislocation motion, calculated in the presence of the assumed superfluid field, to the shear...

Topics: Soft Condensed Matter, Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1610.08354

14
14

Jun 28, 2018
06/18

by
L. Staron; J. C. Phillips

texts

#
eye 14

#
favorite 0

#
comment 0

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

15
15

Jun 27, 2018
06/18

by
Robert Großmann; Pawel Romanczuk; Markus Bär; Lutz Schimansky-Geier

texts

#
eye 15

#
favorite 0

#
comment 0

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

8
8.0

Jun 28, 2018
06/18

by
Maxime Lanoy; Romain Pierrat; Fabrice Lemoult; Mathias Fink; Valentin Leroy; Arnaud Tourin

texts

#
eye 8

#
favorite 0

#
comment 0

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

7
7.0

Jun 29, 2018
06/18

by
N. S. K. Kumar; G. Govindaraj; U. Sailaja

texts

#
eye 7

#
favorite 0

#
comment 0

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

7
7.0

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

texts

#
eye 7

#
favorite 0

#
comment 0

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

4
4.0

Jun 29, 2018
06/18

by
V. A. Andryushchenko; L. P. Kondaurova; S. K. Nemirovskii

texts

#
eye 4

#
favorite 0

#
comment 0

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

10
10.0

Jun 29, 2018
06/18

by
N. Manini; O. M. Braun; E. Tosatti; R. Guerra; A. Vanossi

texts

#
eye 10

#
favorite 0

#
comment 0

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
K. Haydukivska; V. Blavatska

texts

#
eye 6

#
favorite 0

#
comment 0

We analyze the universal size characteristics of flexible ring polymers in solutions in presence of structural obstacles (impurities) in d dimensions. One encounters such situations when considering polymers in gels, colloidal solutions, intra- and extracellular environments. A special case of extended impurities correlated on large distances r according to a power law \sim r^{-a} is considered. Applying the direct polymer renormalization scheme, we evaluate the estimates for averaged gyration...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.4629

4
4.0

Jun 30, 2018
06/18

by
Peter Salamon; Nandor Eber; Balazs Fekete; Agnes Buka

texts

#
eye 4

#
favorite 0

#
comment 0

In contrast to the predictions of the standard theory of electroconvection (EC), our experiments showed that the action of superposed ac and dc voltages rather inhibits pattern formation than favours the emergence of instabilities; the patternless region may extend to much higher voltages than the individual ac or dc thresholds. The pattern formation induced by such asymmetrical voltage was explored in a nematic liquid crystal in a wide frequency range. The findings could be qualitatively...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.1101

4
4.0

Jun 30, 2018
06/18

by
Dominik Düchs; Kris T Delaney; Glenn H Fredrickson

texts

#
eye 4

#
favorite 0

#
comment 0

Field-theoretic models have been used extensively to study the phase behavior of inhomogeneous polymer melts and solutions, both in self-consistent mean-field calculations and in numerical simulations of the full theory capturing composition fluctuations. The models commonly used can be grouped into two categories, namely {\it species} models and {\it exchange} models. Species models involve integrations of functionals that explicitly depend on fields originating both from species density...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.0406

7
7.0

Jun 30, 2018
06/18

by
Robert Evans; Maria C. Stewart

texts

#
eye 7

#
favorite 0

#
comment 0

We investigate the suitability of the local compressibility chi(z) as a measure of the solvophobicity or hydrophobicity of a substrate. Defining the local compressibility as the derivative of the local one-body density w.r.t. the chemical potential at fixed temperature, we use density functional theory (DFT) to calculate chi(z) for a model fluid, close to bulk liquid-gas coexistence, at various planar substrates. These range from a `neutral' substrate with a contact angle of approximately 90...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2729

5
5.0

Jun 30, 2018
06/18

by
Wenwei Liu; Shuiqing Li; Adrian Baule; Hernán A. Makse

texts

#
eye 5

#
favorite 0

#
comment 0

We explore adhesive loose packings of dry small spherical particles of micrometer size using 3D discrete-element simulations with adhesive contact mechanics. A dimensionless adhesion parameter ($Ad$) successfully combines the effects of particle velocities, sizes and the work of adhesion, identifying a universal regime of adhesive packings for $Ad>1$. The structural properties of the packings in this regime are well described by an ensemble approach based on a coarse-grained volume function...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.2165

6
6.0

Jun 30, 2018
06/18

by
Jie Xu; Fangfu Ye; Pingwen Zhang

texts

#
eye 6

#
favorite 0

#
comment 0

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

4
4.0

Jun 30, 2018
06/18

by
G. Stefanucci; Y. Pavlyukh; A. -M. Uimonen; R. van Leeuwen

texts

#
eye 4

#
favorite 0

#
comment 0

We present a diagrammatic approach to construct self-energy approximations within many-body perturbation theory with positive spectral properties. The method cures the problem of negative spectral functions which arises from a straightforward inclusion of vertex diagrams beyond the GW approximation. Our approach consists of a two-steps procedure: we first express the approximate many-body self-energy as a product of half-diagrams and then identify the minimal number of half-diagrams to add in...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.6163

8
8.0

Jun 30, 2018
06/18

by
Szu-Pei Fu; Yuan-Nan Young; Shidong Jiang

texts

#
eye 8

#
favorite 0

#
comment 0

The coarse-grained molecular dynamics (MD) or Brownian dynamics (BD) simulation is a particle-based approach that has been applied to a wide range of biological problems that involve interactions with surrounding fluid molecules or the so-called hydrodynamic interactions (HIs). In this paper, an efficient algorithm is proposed to simulate the motion of a single DNA molecule in linear flows. The algorithm utilizes the integraing factor to cope with the effect of the linear flow of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.5015

3
3.0

Jun 30, 2018
06/18

by
Laurent Helden; Ralf Eichhorn; Clemens Bechinger

texts

#
eye 3

#
favorite 0

#
comment 0

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

3
3.0

Jun 30, 2018
06/18

by
Pepijn G. Moerman; Henrique W. Moyses; Ernest B. van der Wee; David G. Grier; Alfons van Blaaderen; Willem K. Kegel; Jan Groenewold; Jasna Brujic

texts

#
eye 3

#
favorite 0

#
comment 0

Concentration gradients play a critical role in embryogenesis, bacterial locomotion, as well as the motility of active particles. Particles develop concentration profiles around them by dissolution, adsorption, or the reactivity of surface species. These gradients change the surface energy of the particles, driving both their self-propulsion and governing their interactions. Here we uncover a regime in which solute-gradients mediate interactions between slowly dissolving droplets without...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.06765

3
3.0

Jun 30, 2018
06/18

by
Mu Wang; John F. Brady

texts

#
eye 3

#
favorite 0

#
comment 0

We present a comprehensive computational study of the short-time transport properties of bidisperse neutral colloidal suspensions and the corresponding porous media. Our study covers bidisperse particle size ratios up to $4$, and total volume fractions up to and beyond the monodisperse hard-sphere close packing limit. The many-body hydrodynamic interactions are computed using conventional Stokesian Dynamics (SD) via a Monte-Carlo approach. We address suspension properties including the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.8122

4
4.0

Jun 30, 2018
06/18

by
Jiajia Zhou; Ying Jiang; Masao Doi

texts

#
eye 4

#
favorite 0

#
comment 0

When a liquid film of colloidal solution consisting of particles of different sizes is dried on a substrate, the colloids often stratify, where smaller colloids are laid upon larger colloids. This phenomenon is counter intuitive because larger colloids which have smaller diffusion constant are expected to remain near the surface during the drying process, leaving the layer of larger colloids on top of smaller colloids. Here we show that the phenomenon is caused by the interaction between the...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.03182

5
5.0

Jun 30, 2018
06/18

by
Abhinendra Singh; Vanessa Magnanimo; Kuniyasu Saitoh; Stefan Luding

texts

#
eye 5

#
favorite 0

#
comment 0

The steady shear rheology of granular materials is investigated in slow quasi-static states and inertial flows. The effect of the gravity field and contact stiffness, which are conventionally trivialized is the focus of this study. Series of Discrete Element Method simulations are performed on a weakly frictional granular assembly in a split-bottom geometry considering various gravity fields and contact stiffnesses. While traditionally the inertial number, i.e., the ratio of stress to...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.0874

4
4.0

Jun 30, 2018
06/18

by
Adeline Pons; Axelle Amon; Thierry Darnige; Jérôme Crassous; Eric Clément

texts

#
eye 4

#
favorite 0

#
comment 0

We propose a dynamical mechanism leading to the fluidization of soft-glassy amorphous mate-rial driven below the yield-stress by external mechanical fluctuations. The model is based on the combination of memory effect and non-linearity, leading to an accumulation of tiny effects over a long-term. We test this scenario on a granular packing driven mechanically below the Coulomb threshold. We bring evidences for an effective viscous response directly related to small stress modulations in...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.3288

4
4.0

Jun 30, 2018
06/18

by
Thomas Le Goff; Paolo Politi; Olivier Pierre-Louis

texts

#
eye 4

#
favorite 0

#
comment 0

The adhesion dynamics of a membrane confined between two permeable walls is studied using a two-dimensional hydrodynamic model. The membrane morphology decomposes into adhesion patches on the upper and the lower walls and obeys a nonlinear evolution equation that resembles that of phase separation dynamics, which is known to lead to coarsening, i.e. to the endless growth of the adhesion patches. However, due to the membrane bending rigidity the system evolves towards a frozen state without...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.2525

3
3.0

Jun 30, 2018
06/18

by
Ashkan Haji Hosseinloo; Konstantin Turitsyn

texts

#
eye 3

#
favorite 0

#
comment 0

Ease of miniaturization, and less or no maintenance, among other advantages, have pushed towards replacement of conventional batteries with energy harvesters in particular, vibratory energy harvesters. In the recent years, nonlinearity has been intentionally introduced into the otherwise linear energy harvesters in the hope of increasing the frequency bandwidth and power density. However, fundamental limits on the harvestable energy of a harvester subjected to an arbitrary excitation force is...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.1429

5
5.0

Jun 30, 2018
06/18

by
Søren Toxvaerd

texts

#
eye 5

#
favorite 0

#
comment 0

The peptides in biosystems are homochiral polymers of L-amino acids, but razemisate slowly by an active isomerization kinetics. The chemical reactions in biosystems are, however, reversible and what racemisates the peptides at the water activity in the biosystems can ensure homochirality at a smaller activity. Here we show by a thermodynamics analysis and by comprehensive Molecular Dynamics simulations of models of peptides, that the isomerization kinetics racemisates the peptides at a high...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.01623

3
3.0

Jun 30, 2018
06/18

by
Daniel R. Lester; Richard Buscall

texts

#
eye 3

#
favorite 0

#
comment 0

The batch settling test is widely used to estimate the compressive rheology of strongly flocculated colloidal suspensions, in particular the compressive yield strength and hydraulic permeability. Recently it has been discovered that wall adhesion effects in these tests may be significantly greater than previously appreciated, which can introduce unbounded errors in the estimation of these rheological functions. Whilst a methodology to solve the underlying static problem and correct for wall...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.8397

5
5.0

Jun 30, 2018
06/18

by
Andreas Härtel; Mathijs Janssen; Sela Samin; René van Roij

texts

#
eye 5

#
favorite 0

#
comment 0

Capacitive mixing (CAPMIX) and capacitive deionization (CDI) are promising candidates for harvesting clean, renewable energy and for the energy efficient production of potable water, respectively. Both CAPMIX and CDI involve water-immersed porous carbon (supercapacitors) electrodes at voltages of the order of hundreds of millivolts, such that counter-ionic packing is important for the electric double layer (EDL) which forms near the surface of these porous materials. Thus, we propose a density...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.5516

4
4.0

Jun 30, 2018
06/18

by
S. O. Diallo; Q. Zhang; H. O'Neill; E. Mamontov

texts

#
eye 4

#
favorite 0

#
comment 0

We present a pressure dependence study of the dynamics of lysozyme protein powder immersed in deuterated $\alpha$,$\alpha$-trehalose environment via quasi-elastic neutron scattering (QENS). The goal is to assess the baro-protective benefits of trehalose on bio-molecules by comparing the findings with those of a trehalose-free reference study. While the mean-square displacement of the trehalose-free protein (hydrated to $d_{D_2O}\simeq$40 w\%) as a whole, is reduced by increasing pressure, the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.3487

4
4.0

Jun 30, 2018
06/18

by
Jorge Kohanoff; Emilio Artacho

texts

#
eye 4

#
favorite 0

#
comment 0

Water radiolysis by low-energy carbon projectiles is studied by first-principles molecular dynamics. Carbon projectiles of kinetic energies between 175 eV and 2.8 keV are shot across liquid water. Apart from translational, rotational and vibrational excitation, they produce water dissociation. The most abundant products are H and OH fragments. We find that the maximum spatial production of radiolysis products, not only occurs at low velocities, but also well below the maximum of energy...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.06161

7
7.0

Jun 30, 2018
06/18

by
Cemil Yigit; Matej Kanduc; Matthias Ballauff; Joachim Dzubiella

texts

#
eye 7

#
favorite 0

#
comment 0

We study the adsorption of charged patchy particle models (CPPMs) on a thin film of a like-charged and dense polyelectrolyte (PE) brush (of 50 monomers per chain) by means of implicit-solvent, explicit-salt Langevin dynamics computer simulations. Our previously introduced set of CPPMs embraces well-defined one-, and two-patched spherical globules, each of the same net charge and (nanometer) size, with mono- and multipole moments comparable to those of small globular proteins. We focus on...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1701.02457

4
4.0

Jun 30, 2018
06/18

by
Andreas Reindl; Markus Bier; S. Dietrich

texts

#
eye 4

#
favorite 0

#
comment 0

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

9
9.0

Jun 30, 2018
06/18

by
L. M. Pismen

texts

#
eye 9

#
favorite 0

#
comment 0

We consider three-dimensional reshaping of a thin nematoelastic film upon nematic-isotropic transition in the field of a charge one topological defect, leading to either cone or anticone (d-cone) shells. The analysis is based on the relation between the shell metric and the tensor order parameter under the assumption of no elastic deformation and volume change. The shape of the shell can be modified by doping, creating cones with curved generatrices. Anticones necessarily have an even number of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.3365

7
7.0

Jun 30, 2018
06/18

by
D. Slobinsky; Luis A. Pugnaloni

texts

#
eye 7

#
favorite 0

#
comment 0

We propose an alternative approach to count the microscopic static configurations of granular packs under gravity by considering arches. This strategy simplifies the problem of filtering out configurations that are not mechanically stable, opening the way for a range of granular models to be studied via ensemble theory. Following this arch-based approach, we have obtained the exact density of states for a two-dimensional non-interacting rigid arch model of granular assemblies. The calculated...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.7624

9
9.0

Jun 30, 2018
06/18

by
Wen-Sheng Xu; Zhao-Yan Sun; Li-Jia An

texts

#
eye 9

#
favorite 0

#
comment 0

Structural relaxation in binary hard spherical particles has been shown recently to exhibit a wealth of remarkable features when size disparity or mixture's composition is varied. In this paper, we test whether or not similar dynamical phenomena occur in glassy systems composed of binary hard ellipses. We demonstrate via event-driven molecular dynamics simulation that a binary hard-ellipse mixture with an aspect ratio of two and moderate size disparity displays characteristic glassy dynamics...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.0704

5
5.0

Jun 30, 2018
06/18

by
Antina Ghosh; Zoe Budrikis; Vijayakumar Chikkadi; Alessandro Sellerio; Stefano Zapperi; Peter Schall

texts

#
eye 5

#
favorite 0

#
comment 0

When strained beyond the linear regime, soft colloidal glasses yield to steady-state plastic flow in a way that is similar to the deformation of conventional amorphous solids. Due to the much larger size of the colloidal particles with respect to the atoms comprising an amorphous solid, colloidal glasses allow to obtain microscopic insight into the nature of the yielding transition, as we illustrate here combining experiments, atomistic simulations, and mesoscopic modeling. Our results...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1702.03225

4
4.0

Jun 30, 2018
06/18

by
Alessio Caciagli; Darshana Joshi; Jurij Kotar; Erika Eiser

texts

#
eye 4

#
favorite 0

#
comment 0

We demonstrate the realization of (laterally) optically bounded colloidal structures on a liquid-liquid interface of an emulsion droplet. We use DNA tethers to graft the particles to the droplet surface, effectively confining them to a quasi-2D plane with minimum constraints on the lateral movement even when optically trapped in a common single-beam configuration. We show that relatively weak interactions such as depletion can be measured in the optically bounded crystals by video-microscopy...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.08210

7
7.0

Jun 30, 2018
06/18

by
Yimin Jiang; Mario Liu

texts

#
eye 7

#
favorite 0

#
comment 0

Accounting for elasto-plastic motion in granular media, hypoplasticity is a state-of-the-art constitutive model derived from data accumulated over many decades. In contrast, GSH, a hydrodynamic theory, is derived from general principles of physics, with comparatively few inputs from experiments, yet sporting an applicability ranging from static stress distribution via elasto-plastic motion to fast dense flow, including non-uniform ones such as a shear band. Comparing both theories, we find...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1701.06813

5
5.0

Jun 30, 2018
06/18

by
Yunhuan Nie; Hua Tong; Jun Liu; Mengjie Zu; Ning Xu

texts

#
eye 5

#
favorite 0

#
comment 0

By introducing four fundamental types of disorders into a two-dimensional triangular lattice separately, we determine the role of each type of disorder in the vibration of the resulting mass-spring networks. We are concerned mainly with the origin of the boson peak and the connection between the boson peak and the transverse Ioffe-Regel limit. For all types of disorders, we observe the emergence of the boson peak and Ioffe-Regel limits. With increasing disorder, the boson peak frequency...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.00114

5
5.0

Jun 30, 2018
06/18

by
T A Sobral; M A F Gomes

texts

#
eye 5

#
favorite 0

#
comment 0

The continuous packing of a flexible rod in two-dimensional cavities yields a countable set of interacting domains that resembles non-equilibrium cellular systems and belongs to a new class of light-weight material. However, the link between the length of the rod and the number of domains requires investigation especially in the case of non-simply connected cavities, where the number of avoided regions emulates an effective topological temperature. In the present article we report the results...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1703.03761

8
8.0

Jun 30, 2018
06/18

by
Sayantan Acharya; Ujjwal Kumar Nandi; Sarika Maitra Bhattacharyya

texts

#
eye 8

#
favorite 0

#
comment 0

We present a study of the dynamics of small solute particles in a solvent medium where the solute is much smaller in size, mimicking the diffusion of small particles in crowded environment. The solute exhibits Fickian diffusion arising from non-Gaussian Van Hove correlation function. Our study shows that there are at least two possible origins of this non-Gaussian behaviour: the decoupling of the solute-solvent dynamics and the intermittency in the solute motion, the latter playing a dominant...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.03260

9
9.0

Jun 30, 2018
06/18

by
E. N. Tsiok; Yu. D. Fomin; V. N. Ryzhov

texts

#
eye 9

#
favorite 0

#
comment 0

Despite about forty years of investigations, the nature of the melting transition in two dimensions is not completely clear. In the framework of the most popular Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young (BKTHNY) theory, 2D systems melt through two continuous Berezinskii-Kosterlitz-Thouless (BKT) transitions with intermediate hexatic phase. The conventional first-order transition is also possible. On the other hand, recently on the basis of computer simulations the new melting...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1701.03643

5
5.0

Jun 30, 2018
06/18

by
P. Domínguez-García; Frédéric Cardinaux; Elena Bertseva; László Forró; Frank Scheffold; Sylvia Jeney

texts

#
eye 5

#
favorite 0

#
comment 0

We study the Brownian motion of microbeads immersed in water and in a viscoelastic wormlike micelles solution by optical trapping interferometry and diffusing wave spectroscopy. Through the mean-square displacement obtained from both techniques, we deduce the mechanical properties of the fluids at high frequencies by explicitly accounting for inertia effects of the particle and the surrounding fluid at short time scales. For wormlike micelle solutions, we recover the 3/4 scaling exponent for...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.4181

8
8.0

Jun 30, 2018
06/18

by
Adar Sonn-Segev; Anne Bernheim-Groswasser; Yael Roichman

texts

#
eye 8

#
favorite 0

#
comment 0

The mechanical properties of polymer gels based on cytoskeleton proteins (e.g. actin) have been studied extensively due to their significant role in biological cell motility and in maintaining the cell's structural integrity. Microrheology is the natural method of choice for such studies due to its economy in sample volume, its wide frequency range, and its spatial sensitivity. In microrheology, the thermal motion of tracer particles embedded in a complex fluid is used to extract the fluid's...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.5008