52 research outputs found
Influence of the particle shape on the equilibrium morphologies of supracolloidal magnetic filaments
We investigate the equilibrium morphologies of linear and ring-shaped
magnetic filaments made from crosslinked ferromagnetic spherical or ellipsoidal
colloidal particles. Using Langevin dynamics simulations, we calculate the
radius of gyration and total magnetic moment of a single filament at zero field
and different temperatures, analyzing the influence of the particles shape, the
strength of their magnetic moment and the filament length. Our results show
that, among such parameters, the shape of the particles has the strongest
qualitative impact on the equilibrium behavior of the filaments
Harvesting graphics power for MD simulations
We discuss an implementation of molecular dynamics (MD) simulations on a
graphic processing unit (GPU) in the NVIDIA CUDA language. We tested our code
on a modern GPU, the NVIDIA GeForce 8800 GTX. Results for two MD algorithms
suitable for short-ranged and long-ranged interactions, and a congruential
shift random number generator are presented. The performance of the GPU's is
compared to their main processor counterpart. We achieve speedups of up to 80,
40 and 150 fold, respectively. With newest generation of GPU's one can run
standard MD simulations at 10^7 flops/$.Comment: 12 pages, 5 figures. Submitted to Mol. Si
THE EFFECT OF THE TOPOLOGY OF A MAGNETIC POLYMER ON ITS STRUCTURAL AND MAGNETIC PROPERTIES
In this paper, we investigate the dispersions of magnetic polymers by molec-ular dynamics method. We considered four types of magnetic polymers: chain, ring, X- and Y-structures. We have studied the behavior of the initial magnetic susceptibility and con-ducted cluster analysis to obtain full information about the structural properties of magnetic polymers in the systems under study
Current fluctuations in nanopores: the effects of electrostatic and hydrodynamic interactions
Using nonequilibrium Langevin dynamics simulations of an electrolyte with
explicit solvent particles, we investigate the effect of hydrodynamic
interactions on the power spectrum of ionic nanopore currents. At low
frequency, we find a power-law dependence of the power spectral density, with
an exponent depending on the ion density. Surprisingly, however, the exponent
is not affected by the presence of the neutral solvent particles. We conclude
that hydrodynamic interactions do not affect the shape of the power spectrum in
the frequency range studied.Comment: 7 pages, 7 figure
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