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Using molecular dynamics we studied the role of the anisotropy on the phase boundary and on the anomalous behavior of 250 dimeric particles interacting by a core-softened potential. This study led us to an unexpected result: the…

Using collision driven discrete molecular dynamics (DMD), we investigate the thermodynamics and dynamics of systems of 500 dumbbell molecules interacting by a purely repulsive ramp-like discretized potential, consisting of $n$ steps of…

软凝聚态物质 · 物理学 2009-11-11 Paulo A. Netz , Sergey Buldyrev , Marcia C. Barbosa , H. E. Stanley

We use molecular dynamics simulations in two dimensions to investigate the possibility that a core-softened potential can reproduce static and dynamic anomalies found experimentally in liquid water: (i) the increase in specific volume upon…

软凝聚态物质 · 物理学 2009-10-31 A. Scala , M. Reza Sadr-Lahijany , N. Giovambattista , S. V. Buldyrev , H. E. Stanley

Using molecular dynamics simulations and integral equations (Rogers-Young, Percus-Yevick and hypernetted chain closures) we investigate the thermodynamic of particles interacting with continuous core-softened intermolecular potential.…

软凝聚态物质 · 物理学 2007-05-23 Alan B. de Oliveira , Paulo A. Netz , Thiago Colla , Marcia C. Barbosa

We report extensive simulation studies of phase behaviour in single component systems of particles interacting via a core-softened interparticle potential. Two recently proposed examples of such potentials are considered; one in which the…

统计力学 · 物理学 2009-11-07 Nigel B. Wilding , James E. Magee

In this paper we investigate the phase diagram of a dumbbell model composed of two hard-core soft-corona beads through $NpT$ simulations. This particular system was chosen due to its ability to exhibit a diverse range of stripe patterns.…

软凝聚态物质 · 物理学 2023-06-21 T. P. O. Nogueira , José Rafael Bordin

We present a numerical study of the asymmetric dumbbell model consisting of ``molecules'' constructed as two different-sized Lennard-Jones spheres connected by a rigid bond. In terms of the largest (A) particle radius, we report data for…

软凝聚态物质 · 物理学 2024-01-05 Eman Attia , Jeppe C. Dyre , Ulf R. Pedersen

Using molecular dynamics simulations we investigate the thermodynamic of particles interacting with a continuous and a discrete versions of a core-softened (CS) intermolecular potential composed by a repulsive shoulder. Dynamic and…

统计力学 · 物理学 2007-09-12 Alan Barros de Oliveira , Paulo A. Netz , Marcia C. Barbosa

We study the phase diagram of a system of spherical particles interacting in three dimensions through a potential consisting of a strict hard core plus a linear repulsive shoulder at larger distances. The phase diagram (obtained…

统计力学 · 物理学 2009-10-31 E. A. Jagla

Using molecular dynamic simulations we study three families of continuous core-softened potentials consisting of two length scales: a shoulder scale and an attractive scale. All the families have the same slope between the two length scales…

统计力学 · 物理学 2015-05-28 Ney M. Barraz , Evy Salcedo , Marcia C. Barbosa

Molecular dynamics simulations are used to examine the relationship between water-like anomalies and the liquid-liquid critical point in a family of model fluids with multi-Gaussian, core-softened pair interactions. The core-softened pair…

软凝聚态物质 · 物理学 2015-05-27 Evy Salcedo , Alan B. de Oliveira , Ney M. Barraz , Charusita Chakravarty , Marcia C. Barbosa

Using molecular dynamics simulations we investigate the structure of a system of particles interacting through a continuous core-softened interparticle potential. We found for the translational order parameter, t, a local maximum at a…

软凝聚态物质 · 物理学 2007-11-28 Alan B. de Oliveira , Paulo A. Netz , Thiago Colla , Marcia C. Barbosa

We investigate the structure and equilibrium linear-response dynamics of suspensions of hard colloidal dumbbells using Brownian Dynamics computer simulations. The focus lies on the dense fluid and plastic crystal states of the colloids with…

软凝聚态物质 · 物理学 2015-07-10 Nils Heptner , Joachim Dzubiella

Using molecular dynamic simulations we study a waterlike model confined between two fixed hydrophobic plates. The system is tested for density, diffusion and structural anomalous behavior and compared with the bulk results. Within the range…

化学物理 · 物理学 2013-03-06 Leandro Batirolla Krott , Marcia Cristina Bernardes Barbosa

We analyse the dynamics of a two dimensional system of interacting active dumbbells. We characterise the mean-square displacement, linear response function and deviation from the equilibrium fluctuation-dissipation theorem as a function of…

We investigate the relation between thermodynamic and dynamic properties of an associating lattice gas (ALG) model. The ALG combines a three dimensional lattice gas with particles interacting through a soft core potential and orientational…

软凝聚态物质 · 物理学 2009-11-13 Mauricio Girardi , Marcia Szortyka , Marcia C. Barbosa

We investigate the relation between thermodynamic and dynamic properties of an associating lattice gas (ALG) model. The ALG combines a two dimensional lattice gas with particles interacting through a soft core potential and orientational…

统计力学 · 物理学 2009-11-11 Marcia M. Szortyka , Marcia C. Barbosa

By molecular dynamic simulations we study a system of particles interacting through a continuous isotropic pairwise core-softened potential consisting of a repulsive shoulder and an attractive well. The model displays a phase diagram with…

软凝聚态物质 · 物理学 2015-05-18 Pol Vilaseca , Giancarlo Franzese

Using molecular dynamics simulations, we report phase separation in a 50:50 mixture of hot(active) and cold(passive) dumbbells which interact by Lennard-Jones potential. The ratio of the temperature difference between hot and cold dumbbells…

软凝聚态物质 · 物理学 2021-09-02 Nayana V , Shiang-Tai Lin , Prabal K Maiti

We use molecular dynamics computer simulations to investigate the coupling/decoupling between translational and rotational dynamics in a glass-forming liquid of dumbbells. This is done via a careful analysis of the $\alpha$-relaxation time…

软凝聚态物质 · 物理学 2009-11-13 Song-Ho Chong , Walter Kob
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