scholarly journals Effects of magnetic field gradients on the aggregation dynamics of colloidal magnetic nanoparticles

Soft Matter ◽  
2015 ◽  
Vol 11 (38) ◽  
pp. 7606-7616 ◽  
Author(s):  
D. Heinrich ◽  
A. R. Goñi ◽  
T. M. Osán ◽  
L. M. C. Cerioni ◽  
A. Smessaert ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
Magnetic Nanoparticles ◽  
Molecular Dynamics Simulations ◽  
Theoretical Models ◽  
Experimental Results ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Dynamics Simulations

We combined theoretical models, experimental results and molecular dynamics simulations to explain the aggregation dynamics of ferrofluids in the presence of magnetic field gradients.

scholarly journals Fluctuation Relations for Dissipative Systems in Constant External Magnetic Field: Theory and Molecular Dynamics Simulations

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 146
Author(s):  
Alessandro Coretti ◽  
Lamberto Rondoni ◽  
Sara Bonella
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
External Magnetic Field ◽  
Molecular Dynamics Simulations ◽  
Nonequilibrium Molecular Dynamics ◽  
Dissipative Systems ◽  
Common Belief ◽  
Fluctuation Relations ◽  
Dynamics Simulations ◽  
Constant External Magnetic Field

We illustrate how, contrary to common belief, transient Fluctuation Relations (FRs) for systems in constant external magnetic field hold without the inversion of the field. Building on previous work providing generalized time-reversal symmetries for systems in parallel external magnetic and electric fields, we observe that the standard proof of these important nonequilibrium properties can be fully reinstated in the presence of net dissipation. This generalizes recent results for the FRs in orthogonal fields—an interesting but less commonly investigated geometry—and enables direct comparison with existing literature. We also present for the first time a numerical demonstration of the validity of the transient FRs with nonzero magnetic field via nonequilibrium molecular dynamics simulations of a realistic model of liquid NaCl.

scholarly journals Microstructure formation and macroscopic dynamics of ferrofluid emulsion in rotating magnetic field

2018 ◽  
Vol 185 ◽  
pp. 09004 ◽  
Author(s):  
Anastasia Kolesnikova ◽  
Arthur Zakinyan ◽  
Yuri Dikansky
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
Field Strength ◽  
Molecular Dynamics Simulations ◽  
Time Evolution ◽  
Formation Process ◽  
Rotating Magnetic Field ◽  
Microstructure Formation ◽  
Water Emulsion ◽  
Dynamics Simulations

The ferrofluid-in-water emulsion has been produced and studied. The microstructure formation in a flat layer of such emulsion under the action of in-plane rotating magnetic field has been observed. Several microstructure types have been found such as chain-like aggregates, disc-like clusters, branching and space-occupying structures. The time evolution of the formation process has been analysed. The revealed microstructures have been computationally investigated by molecular dynamics simulations. The microstructure dynamics in ferrofluid emulsions manifests itself in macroscopic mechanical effects. We analysed the appearance of macroscopic torque on a ferrofluid emulsion sample in a rotating magnetic field. The value of the torque has been measured as a function of magnetic field strength and frequency.

scholarly journals Surface relief of magnetoactive elastomeric films in a homogeneous magnetic field: molecular dynamics simulations

Soft Matter ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 175-189 ◽  
Author(s):  
Pedro A. Sánchez ◽  
Elena S. Minina ◽  
Sofia S. Kantorovich ◽  
Elena Yu. Kramarenko
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Surface Relief ◽  
Homogeneous Magnetic Field ◽  
Solid Substrate ◽  
Dynamics Simulations

The structure of a thin magnetoactive elastomeric (MAE) film adsorbed on a solid substrate is studied by molecular dynamics simulations.

scholarly journals In Situ SAXS Measurement and Molecular Dynamics Simulation of Magnetic Alignment of Hexagonal LLC Nanostructures

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 123 ◽  
Author(s):  
Weiwei Cong ◽  
Weimin Gao ◽  
Christopher Garvey ◽  
Ludovic Dumée ◽  
Juan Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
Magnetic Nanoparticles ◽  
Computational Simulation ◽  
Lyotropic Liquid Crystal ◽  
Dynamics Simulation ◽  
Saxs Measurement ◽  
Dynamics Simulations ◽  
Templated Materials

The alignment of nanostructures in materials such as lyotropic liquid crystal (LLC) templated materials has the potential to significantly improve their performances. However, accurately characterising and quantifying the alignment of such fine structures remains very challenging. In situ small angle X-ray scattering (SAXS) and molecular dynamics were employed for the first time to understand the hexagonal LLC alignment process with magnetic nanoparticles under a magnetic field. The enhanced alignment has been illustrated from the distribution of azimuthal intensity in the samples exposed to magnetic field. Molecular dynamics simulations reveal the relationship between the imposed force of the magnetic nanoparticles under magnetic field and the force transferred to the LLC cylinders which leads to the LLC alignment. The combinational study with experimental measurement and computational simulation will enable the development and control of nanostructures in novel materials for various applications.

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