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170
Apr 9, 2015
04/15
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Isihara, A. (Akira)
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Originally published: New York : Oxford University Press, 1991
Topics: Condensed matter, Condensed matter, SCIENCE, Condensed matter
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Jun 30, 2018
06/18
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Ajay Singh Negi; Carissa G. Redmon; Subramanian Ramakrishnan; Chinedum O. Osuji
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We consider gelation of colloidal particles in suspension after cessation of shear flow. Particle aggregation is driven by a temperature-tunable attractive potential which controls the growth of clusters under isothermal conditions. A series of frequency resolved time sweeps is used to systematically reconstruct the frequency dependent dynamic moduli as a function of time and temperature or attraction strength. The data display typical hallmarks of gelation with an abrupt transition from a...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1401.8018
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Jun 30, 2018
06/18
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J. Reinhardt; A. Scacchi; J. M. Brader
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We investigate the microstructural and microrheological response to a tracer particle of a two- dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase bound- ary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the concentration of colloidal parti- cles is strongly depleted. The tendency of the liquid to cavitate is characterized by a dimensionless...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.5883
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Jun 30, 2018
06/18
by
Dmitry V. Matyushov
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The standard Maxwell formulation of the problem of polarized dielectrics suffers from a number of difficulties, both conceptual and practical. These difficulties are particularly significant in the case of liquid interfaces, where the ability of the interfacial multipoles to change their orientations to minimize their free energies leads to interfacial polarization localized within a thin microscopic layer. A formalism to capture this physical reality of localized interfacial polarization is...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.6218
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Jun 30, 2018
06/18
by
Zhong-Qiang Liu; Su-Rong Jiang; Tamar A. Yinnon; Xiang-Mu Kong; Ying-Jun Li
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Slip-boundary effects on the polar liquid film motor (PLFM) -- a novel micro-fluidic device with important implications for advancing knowledge on liquid micro-film's structure, dynamics, modeling and technology -- are studied. We develop a mathematical model, under slip boundary conditions, describing electro-hydro-dynamical rotations in the PLFMs induced either by direct current (DC) or alternating current (AC) fields. Our main results are: (i) rotation characteristics depend on the ratio...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1404.5136
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Jun 30, 2018
06/18
by
Tina Hecksher; Bo Jakobsen
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A recent study [Gainaru et al. PRL., 112, 098301 (2014)] of two supercooled monohydroxy alcohols close to the glass-transition temperature showed that the Debye peak, thus far mainly observed in the electrical response, also has a mechanical signature. In this work, we apply broadband shear-mechanical spectroscopy to a systematic series of octanol structural isomers, x-methyl-3-heptanol (with x ranging from 2 to 6). We find that the characteristics of the mechanical signature overall follow the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1406.2521
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Jun 30, 2018
06/18
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Scott V. Franklin; Eric R. Weeks
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We present experimental confirmation of dynamic facilitation in monodisperse and bidisperse colloidal suspensions near the glass transition volume fraction. Correlations in particle dynamics are seen to exist not only in space (clusters and strings) but also as bubbles in space-time. Quantitatively, highly mobile particles are more likely (than immobile particles) to have nearest neighbors that were highly mobile in immediately preceding times. The interpretation is that a particle's mobility...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1406.5782
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Jun 30, 2018
06/18
by
Alexander Moore; Timothy J. Healey
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In 1993 Mahadevan and Keller used the Kirchhoff rod theory to predict the shape of a M\"obius band. Starting from the solution for a square cross-section (isotropic), they employ numerical continuation in the cross-sectional aspect ratio in order to approach the solution for a thin strip. Certain smoothly varying configurations are obtained. More recently in 2007, Starostin and van der Heijden pointed out that an actual M\"obius band "localizes" into a nearly flat triangular...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1407.0571
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Jun 30, 2018
06/18
by
Davide Pini
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We consider a system of particles interacting via a purely repulsive, soft-core potential recently introduced to model effective pair interactions between dendrimers, which is expected to lead to the formation of crystals with multiple occupancy of the lattice sites. The phase diagram is investigated by density-functional theory (DFT) without making any a priori assumption on the functional form of the density profile or on the type of crystal lattice. As the average density $\rho$ is...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1407.1193
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Jun 30, 2018
06/18
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Matti S. Manninen; Juho Rysti; Igor Todoshchenko; Juha Tuoriniemi
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Oscillations on free surface of superfluids at the inviscid limit are damped by quasiparticle scattering. We have studied this effect in both superfluids $^3$He and $^4$He deep below the respective critical temperatures. Surface oscillators offer several benefits over immersed mechanical oscillators traditionally used for similar purposes. Damping is modeled as specular scattering of ballistic quasiparticles from the moving free surface. The model is in reasonable agreement with our...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1410.4071
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Jun 30, 2018
06/18
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V. O. Dupanov; S. M. Ponomarenko
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Further exploration of hybrid organic/inorganic composites (polyurethane based with inorganic material sodium silica polyphosphate) properties with mechanical relaxometer gives ability to analyze microstructure of such materials in terms of chain reptation tubes filler's fractal aggregates and stress amplification.
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1410.8267
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1.0
Jun 30, 2018
06/18
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Jakub Pękalski; Alina Ciach; Noé G. Almarza
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The impact of confinement on self-assembly of particles interacting with short-range attraction and long-range repulsion (SALR) potential is studied for thermodynamic states corresponding to local ordering of clusters or layers in the bulk. Exact and asymptotic expressions for the local density and for the effective potential between the confining surfaces are obtained for a one-dimensional lattice model introduced in [J. P\k{e}kalski et al. $J. Chem. Phys.$ ${\bf 140}$, 144903 (2013)].The...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1411.3862
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Jun 30, 2018
06/18
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Olivier Vincent; David A. Sessoms; Erik J. Huber; Jules Guioth; Abraham D. Stroock
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We investigate the drying dynamics of porous media with two pore diameters separated by several orders of magnitude. Nanometer-sized pores at the edge of our samples prevent air entry, while drying proceeds by heterogeneous nucleation of vapor bubbles (cavitation) in the liquid in micrometer-sized voids within the sample. We show that the dynamics of cavitation and drying are set by the interplay of the deterministic poroelastic mass transport in the porous medium and the stochastic nucleation...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.6776
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Jun 30, 2018
06/18
by
Nick Sirmas; Matei Radulescu
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Shocks in granular media have been shown to develop instabilities. We address the role that early stages of shock development have on this type of instability. We look at the evolution of shock waves driven by a piston in a dilute system of smooth inelastic disks, using both discrete-particle and continuum modelling. To mimic a realistic granular gas, viscoelastic collisions are approximated with an impact velocity threshold $u^*$ needed for inelastic collisions to occur. We show that behaviour...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1407.4202
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Jun 30, 2018
06/18
by
Serge Mora; Yves Pomeau
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Surface tension tends to minimize the area of interfaces between pieces of matter in different thermodynamic phases, be they in the solid or the liquid state. This can be relevant for the macroscopic shape of very soft solids, and lead to a roughening of initially sharp edges. We calculate this effect for a neo-Hookean elastic solid, with assumptions corresponding to actual experiments, namely the case where an initially sharp edge is rounded by the effect of surface tension felt when the fluid...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1408.2266
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Jun 30, 2018
06/18
by
Wen-Sheng Xu; Karl F. Freed
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The generalized entropy theory is applied to assess the joint influence of the microscopic cohesive energy and chain stiffness on glass formation in polymer melts using a minimal model containing a single bending energy and a single (monomer averaged) nearest neighbor van der Waals energy. The analysis focuses on the combined impact of the microscopic cohesive energy and chain stiffness on the magnitudes of the isobaric fragility parameter $m_P$ and the glass transition temperature $T_g$. The...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1409.6781
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0.0
Jun 30, 2018
06/18
by
Alois Würger
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Recent thermophoretic experiments on colloidal suspensions revived an old debate, namely whether the Soret effect is properly described by thermostatics, or necessarily requires non-equilibrium thermodynamics. Based on colloidal transport theory and the entropy production of the related viscous flow, our analysis leads to the conclusion that the equilibrium approach may work for small ions, yet fails for colloidal particles and polymers. Regarding binary molecular mixtures, our results shed...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1401.7546
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1.0
Jun 30, 2018
06/18
by
R. Springhetti; E. Bortot; G. deBotton; M. Gei
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The performances of energy harvesting generators based on dielectric elastomers are investigated. The configuration is of a thin dielectric film coated by stretchable electrodes at both sides. The film is first stretched, then charged and subsequently, afterwards it is released, and finally the charge is harvested at a higher electric potential. The amount of energy extracted by this cycle is bounded by the electric breakdown and the ultimate stretch ratio of the film as well as by structural...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1403.3283
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Jun 30, 2018
06/18
by
Upayan Baul; Satyavani Vemparala
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Effects of presence of ions, at moderate to high concentrations, on dynamical properties of water molecules are investigated through classical molecular dynamics simulations using two well known non-polarizable water models. Simulations reveal that the presence of magnesium chloride (MgCl$_2$) induces perturbations in the hydrogen bond network of water leading to the formation of bulk-like domains with \textquoteleft defect sites\textquoteright~on boundaries of such domains: water molecules at...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1403.7637
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Jun 30, 2018
06/18
by
Samuel S. Schoenholz; Andrea J. Liu; Robert A. Riggleman; Joerg Rottler
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By considering the low-frequency vibrational modes of amorphous solids, Manning and Liu [Phys. Rev. Lett. 107, 108302 (2011)] showed that a population of "soft spots" can be identified that are intimately related to plasticity at zero temperature under quasistatic shear. In this work we track individual soft spots with time in a two-dimensional sheared thermal Lennard Jones glass at temperatures ranging from deep in the glassy regime to above the glass transition temperature. We show...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1404.1403
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0.0
Jun 30, 2018
06/18
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A. Safavi-Naini; B. Capogrosso-Sansone; A. Kuklov
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Hard-core dipolar bosons trapped in a parallel stack of N>=2 1D optical lattices (tubes) can develop several phases made of composites of particles from different tubes: superfluids, supercounterfluids and insulators as well as mixtures of those. Bosonization analysis shows that these phases are threshold-less with respect to the dipolar interaction, with the key "control knob" being filling factors in each tube, provided the inter-tube tunneling is suppressed. The effective...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1405.4328
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0.0
Jun 30, 2018
06/18
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G. De Filippis; V. Cataudella; A. de Candia; A. S. Mishchenko; N. Nagaosa
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The Kubo formula for the electrical conductivity is rewritten in terms of a sum of Drude-like contributions associated to the exact eigenstates of the interacting system, each characterized by its own frequency-dependent relaxation time. The structure of the novel and equivalent formulation, weighting the contribution from each eigenstate by its Boltzmann occupation factor, simplifies considerably the access to the static properties (dc conductivity) and resolves the long standing difficulties...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1406.2917
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0.0
Jun 30, 2018
06/18
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Tianqi Shen; Stefanos Papanikolaou; Corey S. O'Hern; Mark D. Shattuck
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We develop a theoretical description for mechanically stable frictional packings in terms of the difference between the total number of contacts required for isostatic packings of frictionless disks and the number of contacts in frictional packings, $m=N_c^0-N_c$. The saddle order $m$ represents the number of unconstrained degrees of freedom that a static packing would possess if friction were removed. Using a novel numerical method that allows us to enumerate disk packings for each $m$, we...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.0774
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Jun 30, 2018
06/18
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Theodore Marschall; Scott V. Franklin; S. Teitel
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We carry out numerical simulations of soft, U-shaped, frictionless particles in $d=2$ dimensions in order to explore the effects of complex particle shape on the jamming transition. We consider both cases of uniform compression-driven and shear-driven jamming as packing fraction $\phi$ and compression or shear rate is varied. Upon slow compression, jamming is found to occur when the isostatic condition is satisfied. Under driven steady state shearing, jamming occurs at a higher packing fraction...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1402.2855
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Jun 30, 2018
06/18
by
F. Claro; R. Fuchs; P. Robles; R. Rojas
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We discuss the force and torque acting on spherical particles in an ensemble in the presence of a uniform AC electric field. We show that for a torque causing particle rotation to appear the particle must be absorptive. Our proof includes all electromagnetic excitations, which in the case of two or more particles gives rise to one or more resonances in the spectrum of force and torque depending on interparticle distance. Several peaks are found in the force and torque between two spheres at...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1408.5408
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Jun 30, 2018
06/18
by
I. Bivas; N. S. Tonchev
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The mechanical properties of biological membranes play an important role in the structure and the functioning of living organisms. One of the most widely used methods for determination of the bending elasticity modulus of the model lipid membranes (simplified models of the biomembranes with similar mechanical properties) is analysis of the shape fluctuations of the nearly spherical lipid vesicles. A theoretical basis of such an analysis is developed by Milner and Safran. In the present studies...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1409.3709
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Jun 30, 2018
06/18
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Anatoly Kuklov; Lode Pollet; Nikolay Prokof'ev; Boris Svistunov
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We argue that the three key phenomena recently observed in solid $^4$He---mass supertransport, anomalous isochoric compressibility (syringe effect), and giant plasticity---are closely linked to each other through the physics of an interconnected network of tilted quantum-rough dislocations. As immediate implications of this connection several predictions follow: In the absence of $^3$He impurities, the syringe effect and giant plasticity persist down to $T=0$; the dynamical low-frequency...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1409.3750
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Jun 30, 2018
06/18
by
Takashi Uneyama; Takafumi Miyata; Koh-hei Nitta
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We calculate statistical properties of amorphous polymer chains between crystalline lamellae by self-consistent field model simulations. In our model, an amorphous subchain is modelled as a polymer chain of which ends are grafted onto the crystal-amorphous interfaces. The crystal-amorphous interfaces are expressed as impenetrable surfaces. We incorporate the interaction between segments to satisfy the incompressible condition for the segment density field. The simulation results show that...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1410.3257
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1.0
Jun 28, 2018
06/18
by
Junyao Tang; Robert P. Behringer
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Two-dimensional (2D) hopper flow of disks has been extensively studied. Here, we investigate hopper flow of ellipses with aspect ratio $\alpha = 2$, and we contrast that behavior to the flow of disks. We use a quasi-2D hopper containing photoelastic particles to obtain stress/force information. We simultaneously measure the particle motion and stress. We determine several properties, including discharge rates, jamming probabilities, and the number of particles in clogging arches. For both...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1510.07940
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Jun 28, 2018
06/18
by
Lech Longa; Grzegorz Pająk
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What kind of one-dimensional modulated nematic structures (ODMNS) can form nonchiral and chiral bent-core and dimeric materials? Here, using Landau-deGennes theory of nematics, extended to account for molecular steric polarization, we study a possibility of formation of ODMNS, both in nonchiral and intrinsically chiral liquid crystalline materials. Besides nematic and cholesteric phases, we find four bulk ODMNS for nonchiral materials, two of which have not been reported so far. These new...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1511.06792
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Jun 28, 2018
06/18
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Noah P. Mitchell; Vinzenz Koning; Vincenzo Vitelli; William T. M. Irvine
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Curving a thin material, such as a rubber sheet, can trigger fundamental changes in its structure and behavior. In particular, conforming materials to rigid substrates with Gaussian curvature -- positive for spheres and negative for saddles -- has proven a versatile tool to guide the self-assembly of defects such as scars, pleats, folds, blisters, and liquid crystal ripples. Here we show how curvature can likewise be used to control material failure and guide the paths of cracks. In our...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1512.04061
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1.0
Jun 29, 2018
06/18
by
A Pons; T Darnige; Jérôme Crassous; E Clément; Axelle Amon
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Granular packings under constant shear stress display below the Coulomb limit, a logarithmic creep dynamics. However the addition of small stress modulations induces a linear creep regime characterized by an effective viscous response. Using Diffusing Wave Spectroscopy, we investigate the relation between creep and local plastic events spatial distribution ("hot-spots") contributing to the plastic yield. The study is done in the two regimes, i.e. with and without mechanical...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1601.05671
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Jun 29, 2018
06/18
by
O. Ronsin; C. Caroli; T Baumberger
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We study the stress response to a step strain of covalently bonded gelatin gels in the temperature range where triple helix reversible crosslink formation is prohibited. We observe slow stress relaxation towards a $T$-dependent finite asymptotic level. We show that this is assignable to the strain-induced coil $\rightarrow$ helix transition, previously evidenced by S. Courty, J.L. Gornall and E.M. Terentjev (PNAS, {\bf 102}, 13453 (2005)), of a fraction of the polymer strands. Relaxation...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1601.07706
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Jun 29, 2018
06/18
by
Gabriel S. Redner; Caleb G. Wagner; Aparna Baskaran; Michael F. Hagan
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Non-aligning self-propelled particles with purely repulsive excluded volume interactions undergo athermal motility-induced phase separation into a dilute gas and a dense cluster phase. Here, we use enhanced sampling computational methods and analytic theory to examine the kinetics of formation of the dense phase. Despite the intrinsically nonequilibrium nature of the phase transition, we show that the kinetics can be described using an approach analogous to equilibrium classical nucleation...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1603.01362
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Jun 29, 2018
06/18
by
Jamie M. Taylor
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In this work we will derive an anisotropic generalisation of the finitely extensible chain model, due to Kuhn and Gr\"un, which is well known in rubber elasticity. This provides a chain energy that couples elastic behaviour to a probability distribution describing the orientations of liquid crystal monomers within a main chain elastomer. The key point is to invoke a maximum relative entropy assumption on the distribution of bond angles in an observed chain. The chain energy's fourth order...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1606.05288
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Jun 28, 2018
06/18
by
Pietro Tierno; Tom H. Johansen; Thomas M. Fischer
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We report a technique to realize reconfigurable colloidal crystals by using the controlled motion of particle defects above an externally modulated magnetic substrate. The transport of particles is induced by applying a uniform rotating magnetic field to a ferrite garnet film characterized by a periodic lattice of magnetic bubbles. For filling factor larger than one colloid per bubble domain, the particle current arises from propagating defects where particles synchronously exchange their...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1507.01964
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Jun 28, 2018
06/18
by
E. DeGiuli; J. N. McElwaine; M. Wyart
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Flows of hard granular materials depend strongly on the interparticle friction coefficient $\mu_p$ and on the inertial number ${\cal I}$, which characterizes proximity to the jamming transition where flow stops. Guided by numerical simulations, we derive the phase diagram of dense inertial flow of spherical particles, finding three regimes for $10^{-4} \lesssim {\cal I} \lesssim 10^{-1}$: \textit{ frictionless, frictional sliding, } and {\it rolling}. These are distinguished by the dominant...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1509.03512
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Jun 28, 2018
06/18
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Hender Lopez; Erik Brandt; Alexander Mirzoev; Dmitry Zhurkin; Alexander Lyubartsev; Vladimir Lobaskin
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In this work we describe a set of Coarse-grained (CG) tools that allow to simulate the uptake of the nanoparticles (NPs) coated with proteins by a lipid bilayer. We describe a CG model to calculate the adsorption energies and the most favorable adsorption orientations of proteins onto a hydrophobic NP. The proposed method is then used to calculate the adsorption energies of two common proteins in human blood onto neutral and negative charged NPs. We also report the effect of the NP radius on...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1511.06701
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Jun 29, 2018
06/18
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Meng Fan; Minglei Wang; Kai Zhang; Yanhui Liu; Jan Schroers; Mark D. Shattuck; Corey S. O'Hern
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Amorphous solids, such as metallic, polymeric, and colloidal glasses, display complex spatiotemporal response to applied deformations. In contrast to crystalline solids, during loading, amorphous solids exhibit a smooth crossover from elastic response to plastic flow. In this study, we investigate the mechanical response of binary Lennard-Jones glasses to athermal, quasistatic pure shear as a function of the cooling rate used to prepare them. We find several key results concerning the...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.04221
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Jun 29, 2018
06/18
by
E. B. Sonin
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The comment explains that the preprint arXiv:1503.0042 has not presented persuasive theoretical or experimental arguments of existence of spin supercurrents in a magnon condensate prepared in a room temperature yttrium-iron-garnet magnetic film because the authors did not check known criteria for existence of spin supercurrents in magnetically ordered materials. Also they did not compare their supercurrent interpretation with a competing and more realistic scenario of transport by spin...
Topics: Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1607.04720
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Jun 29, 2018
06/18
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Gabi Steinbach; Michael Schreiber; Dennis Nissen; Manfred Albrecht; Sibylle Gemming; Artur Erbe
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Locomotion via cyclic moves presents a challenge to mesoscopic objects in overdamped environments, where time reversibility may prevent directed motion. Most reported cyclic movers exploit anisotropic drag to push themselves forward. Under an oscillating drive, however, anisotropic drag enables locomotion only if the objects can change their shape. Here, we present a strategy that unexpectedly enables structurally invariant objects to move under oscillating fields. The objects are...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.04733
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Jun 29, 2018
06/18
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N. Atzin; O. Guzmán; J. J. de Pablo
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Fibers of bent-core liquid crystals present an internal structure of a rolled smectic layer and can be used as optical waveguides. We used a field-theoretical Monte Carlo simulation to analyze the internal configuration of such fibers as a function of the radial coordinate and to study their equilibrium sates. In contrast to previous studies, we analyzed the fully nonlinear model proposed in [Bailey et al., Phys. Rev. E, 2007, 75, 031701] and revised in [P\'erez-Ortiz et al., Phys. Rev. E,...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1607.06527
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Jun 29, 2018
06/18
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Andrew M. Mascioli; Christopher J. Burke; Timothy J. Atherton
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We study packings of bidispersed spherical particles on a spherical surface. The presence of curvature necessitates defects even for monodispersed particles; bidispersity either leads to a more disordered packing for nearly equal radii, or a higher fill fraction when the smaller particles are accomodated in the interstices of the larger spheres. Variation in the packing fraction is explained by a percolation transition, as chains of defects or scars previously discovered in the monodispersed...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1608.00671
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Jun 29, 2018
06/18
by
Daniel de las Heras; Johannes Loehr; Michael Loenne; Thomas M. Fischer
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We theoretically study the motion of magnetic colloidal particles above a magnetic pattern and compare the predictions with Brownian dynamics simulations. The pattern consists of alternating square domains of positive and negative magnetization. The colloidal motion is driven by periodic modulation loops of an external magnetic field. There exist loops that induce topologically protected colloidal transport between two different unit cells of the pattern. The transport is very robust against...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1608.00808
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Jun 30, 2018
06/18
by
V. Blavatska; N. Fricke; W. Janke
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A brief review of our recent studies aiming at a better understanding of the scaling behaviour of polymers in disordered environments is given. The main emphasis is on a simple generic model where the polymers are represented by (interacting) self-avoiding walks and the disordered environment by critical percolation clusters. The scaling behaviour of the number of conformations and their average spatial extent as a function of the number of monomers and the associated critical exponents...
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1411.4891
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Jun 30, 2018
06/18
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Henni Ouerdane; Andrey A. Varlamov; Alexey V. Kavokin; Christophe Goupil; Cronin B. Vining
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Thermoelectric energy conversion is a direct but low-efficiency process, which precludes the development of long-awaited wide-scale applications. As a breakthrough permitting a drastic performance increase is seemingly out of reach, we fully reconsider the problem of thermoelectric coupling enhancement. The corner stone of our approach is the observation that heat engines are particularly efficient when their operation involves a phase transition of their working fluid. We derive and compute...
Topics: Other Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1412.8641
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Jun 30, 2018
06/18
by
Prakash Kodali; Ganapathy Saravanavel; Sanjiv Sambandan
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We consider possibility of embedding large sheets of polymer piezoelectrics in clothing for sensing and energy harvesting for wearable electronic applications. Power is generated by the crumpling of clothes due to human body movements. From the mechanics of a gently crumpled foil we develop theoretical models and scaling laws for the open circuit voltage and short circuit current and verify via experiments. It is concluded that stretching is the dominant charge generation mechanism with the...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1702.05586
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Jun 30, 2018
06/18
by
William D. Piñeros; Thomas M. Truskett
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Using a recently introduced formulation of the ground-state inverse design problem for a targeted lattice [Pi\~neros et al., J. Chem. Phys. 144} 084502 (2016)], we discover purely repulsive and isotropic pair interactions that stabilize low-density truncated square and truncated hexagonal crystals, as well as promote their assembly in Monte Carlo simulations upon isochoric cooling from a high-temperature fluid phase. The results illustrate that the primary challenge to stabilizing very open...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1703.08615
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Jun 29, 2018
06/18
by
Harol Torres; Victor M. Freixas; Danger Pérez
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A mechanical model was developed to describe the behaviour of a device able to transform vibrations into rotations, named Vibrot. The theoretical model, developed in the newtonian formulation of mechanics, was able to reproduce qualitatively all the experimental results existing in the literature, and quantitatively some of them.
Topics: Soft Condensed Matter, Condensed Matter
Source: http://arxiv.org/abs/1609.08195
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Jun 29, 2018
06/18
by
Takahisa Mitsui; Kenichiro Aoki
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Through the study of the power spectra of a monochromatic light beam reflected by metallic mirrors, fluctuations in their reflectance is observed. The power spectra were obtained down to a factor $10^{-6}$ below the Standard Quantum Limit, with a dynamic range of $10^5$ in the frequency and power, using methods we developed. The properties of the spectra are investigated and their dependence on the material is analyzed. The physics underlying the phenomenon is also discussed. These fluctuations...
Topics: Condensed Matter, Other Condensed Matter
Source: http://arxiv.org/abs/1610.07747
