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European Physical Journal. E, Soft Matter

G Román, E Noseda Grau, A Díaz Compañy, G Brizuela, A Juan, S Simonetti
The adsorption of the 5-Fluorouracil (5-FU) molecule on the pristine and Al-doped activated carbon (AC) was investigated by using the Vienna Ab-initio Simulation Package. It is found that the 5-FU molecule is only weakly adsorbed on the pristine AC with high adsorption energy and large surface distance. The adsorption of the 5-FU molecule on pristine AC is highly disfavored. In contrast, the molecule shows strong interactions with the Al-doped AC confirmed by the lesser adsorption energy, the charge transfers on the Al-modified zone and the significant changes in the DOS at the Fermi level...
September 19, 2018: European Physical Journal. E, Soft Matter
Monoj Adhikari, Srikanth Sastry
We study a model amorphous solid that is subjected to repeated athermal cyclic shear deformation. It has previously been demonstrated that the memory of the amplitudes of shear deformation the system is subjected to (or trained at) is encoded, and can be retrieved by subsequent deformation cycles that serve as read operations. Here we consider different read protocols and measurements and show that single and multiple memories can be robustly retrieved through these different protocols. We also show that shear deformation by a larger amplitude always erases the stored memories...
September 13, 2018: European Physical Journal. E, Soft Matter
Penpark Sirimark, Alex V Lukyanov, Tristan Pryer
We have established previously, in a lead-in study, that the spreading of liquids in particulate porous media at low saturation levels, characteristically less than 10% of the void space, has very distinctive features in comparison to that at higher saturation levels. In particular, we have found that the dispersion process can be accurately described by a special class of partial differential equations, the super-fast non-linear diffusion equation. The results of mathematical modelling have demonstrated very good agreement with experimental observations...
September 12, 2018: European Physical Journal. E, Soft Matter
Abdallah Daddi-Moussa-Ider, Hartmut Löwen, Stephan Gekle
On the basis of the linear hydrodynamic equations, we present an analytical theory for the low-Reynolds-number motion of a solid particle moving inside a larger spherical elastic cavity which can be seen as a model system for a fluid vesicle. In the particular situation where the particle is concentric with the cavity, we use the stream function technique to find exact analytical solutions of the fluid motion equations on both sides of the elastic cavity. In this particular situation, we find that the solution of the hydrodynamic equations is solely determined by membrane shear properties and that bending does not play a role...
September 11, 2018: European Physical Journal. E, Soft Matter
I A Nyrkova, A N Semenov
Amphiphilic molecules in solution typically produce structures coming from cooperative interactions of many synergetically acting functional units. If all essential interactions are weak, the structure can be treated theoretically based on a free energy expansion for small interaction parameters. However, most self-assembling soft matter systems involve strong specific interactions of functional units leading to qualitatively new structures of highly soluble micellar or fibrillar aggregates. Here we focus on the systems with the so-called strongly interacting groups (SIGs) incorporated into unimer molecules and discuss the effects of packing frustrations and unimer chirality as well as the origins of spontaneous morphological chirality in the case of achiral unimers...
September 11, 2018: European Physical Journal. E, Soft Matter
J J López-García, J Horno, C Grosse
The structure of the diffuse part of the electric double layer at solid-electrolyte solution interfaces is examined using a theoretical model that takes into account the finite ion size by modeling the solution as a suspension of polarizable insulating spheres in water. This formalism is applied to mixed electrolyte solutions using the "Boublik-Mansoori-Carnahan-Starling-Leland" (BMCSL) theory for the steric interactions among ions. It is shown that the ionic size differences have a strong bearing on the diffuse part of the electric double-layer structure of these systems...
September 10, 2018: European Physical Journal. E, Soft Matter
C Trégouët, A Mikhailovskaya, T Salez, N Pantoustier, P Perrin, M Reyssat, C Monteux
Using surface-tension measurements, we study the brush-limited adsorption dynamics of a range of amphiphilic polymers, PAAH-[Formula: see text]-[Formula: see text] composed of a poly(acrylic acid) backbone, PAAH, grafted with a fraction [Formula: see text] of alkyl moieties, containing either n = 8 or n = 12 carbon atoms, at pH conditions where the PAAH backbone is not charged. At short times, the surface tension decreases more sharply as the degree of grafting increases, while, at long times, the adsorption dynamics becomes logarithmic in time and is slower as the degree of grafting increases...
September 6, 2018: European Physical Journal. E, Soft Matter
Pawan Singh, Khem B Thapa, Narinder Kumar, Devesh Kumar
In this paper, we investigate tunable transmission characteristics of a one-dimensional periodic structure (1DPS), designed with periodic dielectric materials containing a nematic liquid crystal (NLC) as a defect layer, on the basis of orientation and re-orientation of LC molecules. The nonlinear differential equation for the director of the liquid crystal under the light field is solved numerically. The relation between the liquid crystal director and the intensity of the electromagnetic wave (EMW) is derived...
September 3, 2018: European Physical Journal. E, Soft Matter
Jean Roman, Bruno Le Pioufle, Loïc Auvray, Juan Pelta, Laurent Bacri
Nanopores constitute devices for the sensing of nano-objects such as ions, polymer chains, proteins or nanoparticles. We describe what information we can extract from the current trace. We consider the entrance of polydisperse chains into the nanopore, which leads to a conductance drop. We describe the detection of these current blockades according to their shape. Finally, we explain how data analysis can be used to enhance our understanding of physical processes in confined media.
September 3, 2018: European Physical Journal. E, Soft Matter
Lorenzo Rovigatti, Flavio Romano, John Russo
No abstract text is available yet for this article.
August 29, 2018: European Physical Journal. E, Soft Matter
Armando Maestro, Eva Santini, Eduardo Guzmán
Particle-laden interfaces are ubiquitous nowadays. The understanding of their properties and structure is essential for solving different problems of technological and industrial relevance; e.g. stabilization of foams, emulsions and thin films. These rely on the response of the interface to mechanical perturbations. The complex mechanical response appearing in particle-laden interfaces requires deepening on the understanding of physico-chemical mechanisms underlying the assembly of particles at interface which plays a central role in the distribution of particles at the interface, and in the complex interfacial dynamics appearing in these systems...
August 28, 2018: European Physical Journal. E, Soft Matter
Tao Liang, Yang Yang, Yu-Ren Shi, Juan-Fang Han, Wen-Shan Duan, Xin Jiang
The waves in a one-dimensional (1-D) bead chain produced by a constant velocity impact in a short period are studied numerically in the present paper. It seems that in some cases, the waves look like a shock wave, while in other cases they may be composed of several solitary waves or some oscillations. These characteristics depend on both the bead parameters and the impact parameters, such as the plasticity of the bead material, the piston velocity and the impact duration. It is found that the shock structure appears if the duration of the impact is longer, while it will evolve into several solitary waves if the duration of the impact is small enough...
August 27, 2018: European Physical Journal. E, Soft Matter
Vesselin K Krastev, Giorgio Amati, Sauro Succi, Giacomo Falcucci
In this work, we perform fully three-dimensional numerical simulations of the flow field surrounding cylindrical structures characterized by different types of corrugated surface. The simulations are carried out using the Lattice Boltzmann Method (LBM), considering a flow regime with a Reynolds number [Formula: see text]. The fluid-dynamic wake structure and stability are investigated by means of PSD analyses of the velocity components and by visual inspection of the vortical coherent structure evolution. Moreover, the energy dissipation of the flow is assessed by considering an equivalent discharge coefficient [Formula: see text], which measures the total pressure losses of the flow moving around the various layout under investigation...
August 24, 2018: European Physical Journal. E, Soft Matter
Patrice Bacchin, David Brutin, Anne Davaille, Erika Di Giuseppe, Xiao Dong Chen, Ioannis Gergianakis, Frédérique Giorgiutti-Dauphiné, Lucas Goehring, Yannick Hallez, Rodolphe Heyd, Romain Jeantet, Cécile Le Floch-Fouéré, Martine Meireles, Eric Mittelstaedt, Céline Nicloux, Ludovic Pauchard, Marie-Louise Saboungi
The drying of complex fluids provides a powerful insight into phenomena that take place on time and length scales not normally accessible. An important feature of complex fluids, colloidal dispersions and polymer solutions is their high sensitivity to weak external actions. Thus, the drying of complex fluids involves a large number of physical and chemical processes. The scope of this review is the capacity to tune such systems to reproduce and explore specific properties in a physics laboratory. A wide variety of systems are presented, ranging from functional coatings, food science, cosmetology, medical diagnostics and forensics to geophysics and art...
August 22, 2018: European Physical Journal. E, Soft Matter
Edan Lerner
States of self stress (SSS) are assignments of forces on the edges of a network that satisfy mechanical equilibrium in the absence of external forces. In this work we show that a particular class of quasilocalized SSS in packing-derived networks, first introduced by D.M. Sussman, C.P. Goodrich, A.J. Liu (Soft Matter 12, 3982 (2016)), are characterized by a decay length that diverges as [Formula: see text] , where [Formula: see text] is the mean connectivity of the network, and [Formula: see text] is the Maxwell threshold in two dimensions, at odds with previous claims...
August 21, 2018: European Physical Journal. E, Soft Matter
Raul Martinez, Francisco Alarcon, Diego Rogel Rodriguez, Juan Luis Aragones, Chantal Valeriani
In our work we have studied a two-dimensional suspension of finite-size Vicsek hard disks, whose time evolution follows an event-driven dynamics between subsequent time steps. Having compared its collective behaviour with the one expected for a system of scalar Vicsek point-like particles, we have analysed the effect of considering two possible bouncing rules between the disks: a Vicsek-like rule and a pseudo-elastic one, focusing on the order-disorder transition. Next, we have added to the two-dimensional suspension of hard-disk Vicsek particles disk-like passive obstacles of two types: either fixed in space or moving according to the same event-driven dynamics...
August 17, 2018: European Physical Journal. E, Soft Matter
Ming Liu, Xiao-Peng Chen
A two-dimensional drop sliding down a plate under the action of gravity is numerically studied. A lattice Boltzmann method coupled with the phase field method is utilized, which can well capture the motion of the three-phase contact line. The morphologies of the sliding drop and corresponding force balance during the process are considered. It is found that there are two basic sliding modes of the drop with various gravitational and viscous effects. The viscous shear stress ( [Formula: see text] from the wall acts on the bottom of the drop, and it is divided in two parts...
August 17, 2018: European Physical Journal. E, Soft Matter
Anshul D S Parmar, Shiladitya Sengupta, Srikanth Sastry
The slow down of dynamics in glass forming liquids as the glass transition is approached has been characterised through the Adam-Gibbs relation, which relates relaxation time scales to the configurational entropy. The Adam-Gibbs relation cannot apply simultaneously to all relaxation times scales unless they are coupled, and exhibit closely related temperature dependences. The breakdown of the Stokes-Einstein relation presents an interesting situation to the contrary, and in analysing it, it has recently been shown that the Adam-Gibbs relation applies to diffusion coefficients rather than to viscosity or structural relaxation times related to the decay of density fluctuations...
August 8, 2018: European Physical Journal. E, Soft Matter
Yi Sun, Liping Yan, Benyong Chen
Wrinkling patterns are widely observed in nature and can be used in many high-tech applications such as microfluidic channel, self-assembly ordered microstructures and improved adhesives. In order to use the wrinkling patterns for these applications, it is necessary to precisely control the formation and geometry of the wrinkles. In this paper, we investigate the localized wrinkling of a stiff film/compliant substrate system subjected to a thrust force with a controllable micro-probe. A thin Au film is deposited onto a thick PDMS substrate attached to a glass to form the stiff film/compliant substrate system...
August 6, 2018: European Physical Journal. E, Soft Matter
Albert Johner, Nam-Kyung Lee
Since it was first proposed in 1982, the Daoud and Cotton (DC) model for star-shaped polymers was intensively used also for self-assembled copolymers and small colloids grafted with long polymers. We try to clarify the position of the DC model and focus on the star partition function which plays a central role in self-assembly and gives access to the star-star interaction. While the predicted star-star interaction agrees with scattering data by Likos et al. (Phys. Rev. Lett. 80, 4450 (1998)), an extensive simulation by Hsu et al...
July 25, 2018: European Physical Journal. E, Soft Matter
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