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Topic: condensed

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Jun 30, 2018
06/18

by
Domenico De Tommasi; Giuseppe Puglisi; Giuseppe Saccomandi

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We propose a general multiscale approach for the mechanical behavior of three-dimensional networks of macromolecules undergoing strain-induced unfolding. Starting from a (statistically based) energetic analysis of the macromolecule unfolding strategy, we obtain a three-dimensional continuum model with variable natural configuration and an energy function analytically deduced from the microscale material parameters. The comparison with the experiments shows the ability of the model to describe...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.3722

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Jun 30, 2018
06/18

by
Hui-Shun Kuan; Robert Blackwell; Loren E. Hough; Matthew A. Glaser; M. D. Betterton

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Non-equilibrium active matter made up of self-driven particles with short-range repulsive interactions is a useful minimal system to study active matter as the system exhibits collective motion and nonequilibrium order-disorder transitions. We studied high-aspect-ratio self-propelled rods over a wide range of packing fraction and driving to determine the nonequilibrium state diagram and dynamic properties. Flocking and nematic-laning states occupy much of the parameter space. In the flocking...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1407.4842

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Jun 30, 2018
06/18

by
T. Zhang; J. M. Schwarz; Moumita Das

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We construct and analyze a model for a disordered linear spring network with anisotropy. The modeling is motivated by, for example, granular systems, nematic elastomers, and ultimately cytoskeletal networks exhibiting some underlying anisotropy. The model consists of a triangular lattice with two different bond occupation probabilities, $p_x$ and $p_y$, for the linear springs. We develop an effective medium theory (EMT) to describe the network elasticity as a function of $p_x$ and $p_y$. We...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.5910

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Jun 30, 2018
06/18

by
Ziwei Wang; Jie Zhang

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In this study, we have investigated the fluctuations of particle motion, i.e. the non-affine motion, during the avalanche process, discovering a rich dynamics from the microscopic to the macroscopic scales. We find that there is strong correlation between the magnitude of the velocity fluctuation and the velocity magnitude in the spatial and temporal domains. The possible connection between this finding and STZ is discussed based on the direct measurement of the T1 events. In addition, the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1410.6219

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Jun 30, 2018
06/18

by
Jakub Pękalski; Paweł Rogowski; Alina Ciach

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We consider a lattice model for amphiphiles in a solvent with molecules chemically similar to one part of the amphiphilic molecule. The dependence of the interaction potential on orientation of the amphiphilic molecules is taken into account explicitly. The model is solved exactly in one dimension by the transfer-matrix method. In particular, pressure as a function of concentration, correlation function and specific heat are calculated. The model is compared with the recently introduced lattice...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.3509

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Jun 29, 2018
06/18

by
V. V. Zavjalov; S. Autti; V. B. Eltsov; P. J. Heikkinen

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We can pump magnons to a nearly harmonic magneto-textural trap in superfluid $^3$He-B. Using the NMR spectroscopy of levels in the trap we have measured the anisotropic magnon mass and related values of the spin-wave velocities. Based on our measurements we provide values of the Fermi-liquid parameter $F^a_1$.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.04192

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Jun 29, 2018
06/18

by
Bing-Sui Lu; Ali Naji; Rudolf Podgornik

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Investigations of the elastic behavior of bulk elastomers have traditionally proceeded on the basis of classical rubber elasticity, which regards chains as thermally fluctuating but disregards the thermal fluctuations of the cross-links. Here, we consider an incompressible and flat elastomer film of an axisymmetric shape confined between two large hard co-planar substrates, with the axis of the film perpendicular to the substrates. We address the impact that thermal fluctuations of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1601.05005

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Jun 29, 2018
06/18

by
S. Mostafa Sabzevari; Joshua D. McGraw; Paula Wood-Adams

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We investigate the effect of short chains on slip of highly entangled polystyrenes (PS) during thin film dewetting from non-wetting fluorinated surfaces. Binary and ternary mixtures were prepared from monodisperse PS with weight average molecular weights $5 < M_\textrm{w} < 490$ kg/mol. Flow dynamics and rim morphology of dewetting holes were captured using optical and atomic force microscopy. Slip properties are assessed in the framework of hydrodynamic models describing the rim height...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1602.04109

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Jun 29, 2018
06/18

by
Christian Hoell; Hartmut Löwen

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We explore structural and dynamical behavior of concentrated colloidal suspensions made up by C-shape particles using Brownian dynamics computer simulations and theory. In particular, we focus on the entanglement process between nearby particles for almost closed C-shapes with a small opening angle. Depending on the opening angle and the particle concentration, there is a percolation transition for the cluster of entangled particles which shows the classical scaling characteristics. In a broad...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1602.05380

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Jun 29, 2018
06/18

by
Daan Frenkel

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When neutral nano-particles are heated or cooled in a polar liquid, they will interact with each other as if they carry an electrostatic charge that is proportional to the temperature difference between the particle and the surrounding fluid. The same should hold for paramagnetic liquids, in which case the nano-particles should behave as magnetic monopoles. However, the analogy with electrostatics/magnetostatics is not complete: heated/cooled nano-particles do not move under the influence of an...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1602.08074

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Jun 29, 2018
06/18

by
G. Mazovec; M. Lukšič; B. Hribar-Lee

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By means of Monte Carlo computer simulations in the isothermal-isobaric ensemble, we investigated the interaction of a hydrophobic ligand with the hydrophobic surfaces of various curvatures (planar, convex and concave). A simple two-dimensional model of water, hydrophobic ligand and surface was used. Hydration/dehidration phenomena concerning water molecules confined close to the molecular surface were investigated. A notable dewetting of the hydrophobic surfaces was observed together with the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.02163

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Jun 29, 2018
06/18

by
M. Borówko; T. Staszewski

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We use density functional theory to investigate adsorption of liquid mixtures on solid surfaces modified with end-grafted chains. The chains are modelled as freely joined spheres. The fluid molecules are spherical. All spherical species interact via the Lennard-Jones (12-6) potential. The Lennard-Jones (9-3) potential describes interactions of solvent molecules with the substrate. We study the relative excess adsorption isotherms, the structure of surface layer and its composition. The impact...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.02166

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Jun 29, 2018
06/18

by
Wen Zheng; Hao Liu; Ning Xu

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We find that unjammed packings of frictionless particles with rather weak attraction can always be driven into solid-like states by shear. The structure of shear-driven solids evolves continuously with packing fraction from gel-like to jamming-like, but is almost independent of the shear stress. In contrast, both the density of vibrational states (DOVS) and force network evolve progressively with the shear stress. There exists a packing fraction independent shear stress $\sigma_c$, at which the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.02390

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Jun 29, 2018
06/18

by
C. C. Thomas; D. J. Durian

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We experimentally study the dynamics of granular media in a discharging hopper. In such flows, there often appears to be a critical outlet size $D_c$ such that the flow never clogs for $D > D_c$. We report on the time-averaged velocity distributions, as well as temporal intermittency in the ensemble-averaged velocity of grains in a viewing window, for both $D < D_c$ and $D > D_c$, near and far from the outlet. We characterize the velocity distributions by the standard deviation and the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.08081

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Jun 29, 2018
06/18

by
Paul Plucinsky; Marius Lemm; Kaushik Bhattacharya

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Nematic elastomers and glasses are solids that display spontaneous distortion under external stimuli. Recent advances in the synthesis of sheets with controlled heterogeneities have enabled their actuation into non-trivial shapes with unprecedented energy density. Thus, these have emerged as powerful candidates for soft actuators. To further this potential, we introduce the key metric constraint which governs shape changing actuation in these sheets. We then highlight the richness of shapes...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1605.02681

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Jun 29, 2018
06/18

by
Wen-Sheng Xu; Karl F. Freed

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The lattice cluster theory (LCT) for strongly interacting, self-assembling telechelic polymers provides a theoretical tool that enables establishing the connections between important microscopic molecular details of self-assembling polymers and their bulk thermodynamics. The original LCT for self-assembly of telechelic polymers considers a model of fully flexible linear chains [J. Dudowicz and K. F. Freed, J. Chem. Phys. \textbf{136}, 064902 (2012)], while our recent work introduces a...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1605.09092

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Jun 29, 2018
06/18

by
Sven Erik Ilse; Christian Holm; Joost de Graaf

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Self-propelled particles can spontaneously form dense phases from a dilute suspension in a process referred to as motility-induced phase separation. The properties of the out-of-equilibrium structures that are formed are governed by the specifics of the particle interactions and the strength of the activity. Thus far, most studies into the formation of these structures have focused on spherical colloids, dumbbells, and rod-like particles endowed with various interaction potentials. Only a few...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1606.00223

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Jun 29, 2018
06/18

by
Merlijn S. van Deen; Brian P. Tighe; Martin van Hecke

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We probe the onset and effect of contact changes in 2D soft harmonic particle packings which are sheared quasistatically under controlled strain. First, we show that in the majority of cases, the first contact changes correspond to the creation or breaking of contacts on a single particle, with contact breaking overwhelmingly likely for low pressures and/or small systems, and contact making and breaking equally likely for large pressures and in the thermodynamic limit. The statistics of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1606.04799

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Jun 29, 2018
06/18

by
Alvaro Domínguez; P. Malgaretti; M. N. Popescu; S. Dietrich

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Chemically active colloids generate changes in the chemical composition of their surrounding solution and thereby induce flows in the ambient fluid which affect their dynamical evolution. Here we study the many-body dynamics of a monolayer of active particles trapped at a fluid-fluid interface. To this end we consider a mean-field model which incorporates the direct pair interaction (including also the capillary interaction which is caused specifically by the interfacial trapping) as well as...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1606.08215

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Jun 29, 2018
06/18

by
E. DeGiuli; J. N. McElwaine

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Comment on O. Gendelman, Y. G. Pollack, I. Procaccia, S. Sengupta, and J. Zylberg, Physical Review Letters 116, 078001 (2016).

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1606.09026

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Jun 29, 2018
06/18

by
Aaron Bardall; Karen E. Daniels; Michael Shearer

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On a sufficiently-soft substrate, a resting fluid droplet will cause significant deformation of the substrate. This deformation is driven by a combination of capillary forces at the contact line and the fluid pressure at the solid surface. These forces are balanced at the surface by the solid traction stress induced by the substrate deformation. Young's Law, which predicts the equilibrium contact angle of the droplet, also indicates an a priori radial force balance for rigid substrates, but not...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1607.01637

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Jun 29, 2018
06/18

by
Nicoletta Gnan; Francesco Sciortino; Emanuela Zaccarelli

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We report numerical results on the effective potential arising between two colloids immersed in a self-assembling cosolute which forms reversible clusters. The potential is evaluated at cosolute state points with different densities and temperatures but with the same connectivity properties. We find that the range of the resulting effective potential is controlled only by the cosolute thermal correlation length rather than by its connectivity length. We discuss the significant differences with...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1608.06456

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Jun 28, 2018
06/18

by
Pierre Ronceray; Peter Harrowell

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The expression of the free energy of a liquid in terms of an explicit decomposition of the particle configurations into local coordination clusters is examined. We argue that the major contribution to the entropy associated with structural fluctuations arises from the local athermal constraints imposed by the overlap of adjacent coordination shells. In the context of the recently developed Favoured Local Structure model [Soft Matt. 11, 3322 (2015)], we derive explicit expressions for the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1510.03073

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Jun 28, 2018
06/18

by
Paul Mort

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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

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Jun 28, 2018
06/18

by
Fabien Paillusson; Matthew R. Pennington; Halim Kusumaatmaja

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We study the phase separation of binary lipid mixtures that form bicontinuous cubic phases. The competition between non-uniform Gaussian membrane curvature and line tension leads to a very rich phase diagram, where we observe symmetry breaking of the membrane morphologies and reentrant phenomena due to the formation of bridges between segregated domains. Upon increasing the line tension contribution, we also find facetting of lipid domains that we explain using a simple argument based on the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1510.09112

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Jun 28, 2018
06/18

by
Wenwei Liu; Shuiqing Li; Sheng Chen

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With a novel 3D discrete-element method specially developed with adhesive contact mechanics, random loose packings of uniform spherical micron-sized particles are fully investigated. The results show that large velocity, large size or weak adhesion can produce a relatively dense packing when other parameters are fixed, and these combined effects can be characterized by a dimensionless adhesion parameter ( $Ad=\omega/2\rho_pU^2_0R$). Four regimes are identified based on the value of $Ad$: RCP...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.02315

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Jun 28, 2018
06/18

by
Tymofiy V. Chagovets

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We report an experimental investigation of the electric response of superfluid helium. Our results confirm the presence of electric potential that appears at the relative oscillatory motion of normal fluid and superfluid components in helium generated by the heater. The resonance of the electric potential was observed in the first four harmonics. A suggested method for the detection of the electric response allows the required resonance peak to be distinguished from spurious signals. Our...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.03474

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Jun 28, 2018
06/18

by
Ranjan V. Mannige

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For two-component assemblies, an inherent structure diagram (ISD) is the relationship between set inter-subunit energies and the types of kinetic traps (inherent structures) one may obtain from those energies. It has recently been shown that two-component ISDs are apportioned into regions or plateaux within which inherent structures display uniform features (e.g., stoichometries and morphologies). Interestingly, structures from one of the plateaux were also found to be robust outcomes of one...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.04175

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Jun 29, 2018
06/18

by
Sergey K. Nemirovskii

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In the paper by Khomenko et al. [Phys. Rev. B \textbf{91}, 180504 (2015)] the authors, analyzing numerically the steady counterflowing helium in inhomogeneous channel flow, concluded that the production term $\mathcal{P}$ in the Vinen equation is proportional to $\left\vert \mathbf{V}_{ns}\right\vert ^{3}\mathcal{L}^{1/2}$ (where $\mathcal{L}$ is vortex line density and $\mathbf{V}_{ns}$ is the counterflow velocity). In present comment we demonstrated that the procedure, implemented by the...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.06594

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Jun 29, 2018
06/18

by
Thomas Müller; Kai Huang

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The normal coefficient of restitution (COR) for a spherical particle bouncing on a wet plane is investigated experimentally and compared with a model characterizing the energy loss at impact. For fixed ratios of liquid film thickness $\delta$ to particle diameter $D$, the wet COR is always found to decay linearly with St$^{-1}$, where St, the Stokes number, measures the particle inertia with respect to the viscous force of the liquid. Such a dependency suggests a convenient way of predicting...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1601.07032

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Jun 29, 2018
06/18

by
N. Lo Gullo; L. Vittadello; M. Bazzan; L. Dell'Anna

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We investigate, theoretically and experimentally,the properties of diffraction spectra of Fibonacci lattices with arbitrary spacings. We show that, by means of a suitable composition rule, a Fibonacci sequence can be mapped into another one with a different lattice spacing. In this way we are able to define equivalence classes of Fibonacci structures and their generators, namely the Fibonacci sequences from which all the others can be obtained by compostion rule. We show that each class can be...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.07499

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Jun 29, 2018
06/18

by
R. Wulfert; U. Seifert; T. Speck

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Employing theory and numerical simulations, we demonstrate discontinuous force thinning due to the motion of an external probe in a host medium, which we approximate as structureless. When the driving of the probe exceeds a critical force, the microviscosity of the medium drops abruptly by about an order of magnitude. This phenomenon occurs for strong attractive interactions between probe and a sufficiently dense host medium.

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1602.05976

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Jun 29, 2018
06/18

by
A. Arreola-Lucas; J. A. Franco-Villafañe; G. Báez; R. A. Méndez-Sánchez

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Theoretical and experimental results for in-plane vibrations of a uniform rectangular plate with free boundary conditions are obtained. The experimental setup uses electromagnetic-acoustic transducers and a vector network analyzer. The theoretical calculations were obtained using the plane wave expansion method applied to the in-plane thin plate vibration theory. The agreement between theory and experiment is excellent for the lower 95 modes covering a very wide frequency range from DC to 20...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1602.06224

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Jun 29, 2018
06/18

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

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Controlled micro- to meso-scale porosity is a common materials design goal with possible applications ranging from molecular gas adsorption to particle size selective permeability or solubility. Here, we use inverse methods of statistical mechanics to design an isotropic pair interaction that, in the absence of an external field, assembles particles into an inhomogeneous {\em fluid} matrix surrounding pores of prescribed size ordered in a lattice morphology. The pore size can be tuned via...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.03408

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Jun 29, 2018
06/18

by
Nicholas B. Tito; Stefano Angioletti-Uberti; Daan Frenkel

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We present a simple yet accurate numerical approach to compute the free energy of binding of multivalent objects on a receptor-coated surface. The method correctly accounts for the fact that one ligand can bind to at most one receptor. The numerical approach is based on a saddle-point approximation to the computation of a complex residue. We compare our theory with the powerful Valence-Limited Interaction Theory (VLIT) (J. Chem. Phys. 137, 094108(2012), J. Chem. Phys. 138, 021102(2013)) and...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.04343

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Jun 29, 2018
06/18

by
Rafael Roa; Daniel Menne; Jonas Riest; Pompilia Buzatu; Emiliy K. Zholkovskiy; Jan K. G. Dhont; Matthias Wessling; Gerhard Nägele

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We present a comprehensive study of cross-flow ultrafiltration (UF) of charge-stabilized suspensions, under low-salinity conditions of electrostatically strongly repelling colloidal particles. The axially varying permeate flux, near-membrane concentration-polarization (CP) layer and osmotic pressure profiles are calculated using a macroscopic diffusion-advection boundary layer method, and are compared with filtration experiments on aqueous suspensions of charge-stabilized silica particles. The...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.05896

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Jun 29, 2018
06/18

by
Wouter Montfrooij

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We show that the position of the de Gennes minimum in scattering spectra, where the dynamics of liquids shows down, is given by a hard-sphere expression for a range of mono-atomic liquids that crystallize in a close packed structure. This expression relates the position of the minimum to the number density of the liquid, without any adjustable or unknown parameters. We argue that this implies that a liquid can be viewed as a close packed structure of the cages that represent the confinement of...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.08799

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Jun 29, 2018
06/18

by
Carlos P. Ortiz; Robert Riehn; Karen E. Daniels

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Understanding the particle-scale transition from elastic deformation to plastic flow is central to making predictions about the bulk material properties and response of disordered materials. To address this issue, we perform experiments on flow-stabilized solids composed of micron-scale spheres within a microfluidic channel, in a regime where particle inertia is negligible. Each solid heap exists within a stress gradient imposed by the flow, and we track the positions of particles in response...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1603.09369

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Jun 29, 2018
06/18

by
Andrea Scagliarini; Matteo Lulli; Massimo Bernaschi; Mauro Sbragaglia

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By means of mesoscopic numerical simulations of a model soft-glassy material, we investigate the role of boundary roughness on the flow behaviour of the material, probing the bulk/wall and global/local rheologies. We show that the roughness reduces the wall slip induced by wettability properties and acts as a source of fluidisation for the material. A direct inspection of the plastic events suggests that their rate of occurrence grows with the fluidity field, reconciling our simulations with...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.00785

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Jun 29, 2018
06/18

by
Pierre A. Haas; Raymond E. Goldstein; Stoyan K. Smoukov; Diana Cholakova; Nikolai Denkov

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Recent studies of cooled oil emulsion droplets uncovered transformations into a host of flattened shapes with straight edges and sharp corners, driven by a partial phase transition of the bulk liquid phase. Here, we explore theoretically the simplest geometric competition between this phase transition and surface tension in planar polygons, and recover the observed sequence of shapes and their statistics in qualitative agreement with experiments. Extending the model to capture some of the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.00584

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Jun 29, 2018
06/18

by
Christoph Loesche; Tim Husmann

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Small, illuminated aerosol particles embedded in a gas experience a photophoretic force. Most approximations assume the mean particle surface temperature to be effectively the gas temperature. This might not always be the case. If the particle temperature or the thermal radiation field strongly differs from the gas temperature (optically thin gases), given approximations for the free molecule regime overestimate the photophoretic force by an order of magnitude on average and for individual...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.01341

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Jun 28, 2018
06/18

by
Giuseppe Carbone; Elena Pierro; Giuseppina Recchia

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In this paper we investigate the loading and unloading behavior of soft solids in adhesive contact with randomly rough profiles. The roughness is assumed to be described by a self-affine fractal on a limited range of wave-vectors. A spectral method is exploited to generate such randomly rough surfaces. The results are statistically averaged, and the calculated contact area and applied load are shown as a function of the penetration, for loading and unloading conditions. We found that the...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.08891

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Jun 28, 2018
06/18

by
Simone Dussi; Marjolein Dijkstra

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Predicting the macroscopic chiral behaviour of cholesteric liquid crystals from the microscopic chirality of the particles is highly non-trivial, even when the chiral interactions are purely entropic in nature. Here we introduce a novel chiral hard-particle model, namely particles with a twisted polyhedral shape and obtain, for the first time, a stable fully-entropy-driven cholesteric phase by computer simulations. By slightly modifying the triangular base of the particle, we are able to switch...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.09318

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Jun 29, 2018
06/18

by
Maurizio Rossi; Francesco Ancilotto

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We perform ab-initio Quantum Monte Carlo simulations of para-hydrogen (pH$_2$) at $T=0$ K confined in carbon nanotubes (CNT) of different radii. The radial density profiles show a strong layering of the pH$_2$ molecules which grow, with increasing number of molecules, in solid concentric cylindrical shells and eventually a central column. The central column can be considered an effective one-dimensional (1D) fluid whose properties are well captured by the Tomonaga-Luttinger liquid theory. The...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1602.03282

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Jun 29, 2018
06/18

by
Juan Ruben Gomez-Solano; Alex Blokhuis; Clemens Bechinger

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We experimentally investigate active motion of spherical Janus colloidal particles in a viscoelastic fluid. Self-propulsion is achieved by a local concentration gradient of a critical polymer mixture which is imposed by laser illumination. Even in the regime where the fluid's viscosity is independent from the deformation rate induced by the particle, we find a remarkable increase of up to two orders of magnitude of the rotational diffusion with increasing particle velocity, which can be...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1602.07856

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Jun 29, 2018
06/18

by
Endao Han; Ivo R. Peters; Heinrich M. Jaeger

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A remarkable property of dense suspensions is that they can transform from liquid-like at rest to solid-like under sudden impact. Previous work showed that this impact-induced solidification involves rapidly moving jamming fronts; however, details of this process have remained unresolved. Here we use high-speed ultrasound imaging to probe non-invasively how the interior of a dense suspension responds to impact. Measuring the speed of sound we demonstrate that the solidification proceeds without...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.00380

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Jun 29, 2018
06/18

by
Julian Helfferich; Ivan Lyubimov; Daniel Reid; Juan J. de Pablo

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Glasses produced via physical vapor deposition can display greater kinetic stability and lower enthalpy than glasses prepared by liquid cooling. While the reduced enthalpy has often been used as a measure of the stability, it is not obvious whether dynamic measures of stability provide the same view. Here, we study dynamics in vapor-deposited and liquid-cooled glass films using molecular simulations of a bead-spring polymer model as well as a Lennard-Jones binary mixture in two and three...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.01077

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Jun 29, 2018
06/18

by
M. C. Gordillo; J. Boronat

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Recent heat-capacity experiments show quite unambiguously the existence of a liquid $^3$He phase adsorbed on graphite. This liquid is stable at an extremely low density, possibly one of the lowest found in Nature. Previous theoretical calculations of the same system, and in strictly two dimensions, agree with the result that this liquid phase is not stable and the system is in the gas phase. We calculated the phase diagram of normal $^3$He adsorbed on graphite at $T=0$ using quantum Monte Carlo...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1604.01273

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Jun 29, 2018
06/18

by
B. Cichocki; M. L. Ekiel-Jezewska; E. Wajnryb

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The exact analytical expressions for the time-dependent cross-correlations of the translational and rotational Brownian displacements of a particle with arbitrary shape, derived by us elsewhere, are in this Comment applied to construct a method to analyze Brownian motion of a particle of an arbitrary shape, and to extract accurately the self-diffusion matrix from the measurements of the cross-correlations, what in turn allows to determine details of the particle structure. In this way, we...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1604.05271