Effects of Magnetic Field Gradient on Particle Distributions of Suspension Comprised of both Magnetic and Nonmagnetic Particles Using Two-Dimensional Monte Carlo Simulations

2009 ◽  
Vol 79-82 ◽  
pp. 1301-1304
Author(s):  
Xiao Ling Peng ◽  
Mi Yan ◽  
Hong Liang Ge
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Magnetic Fields ◽  
Monte Carlo Simulations ◽  
Field Gradient ◽  
Magnetic Field Gradient ◽  
Slip Casting ◽  
Functionally Graded ◽  
Two Dimensional ◽  
Nonmagnetic Particles

Functionally graded materials (FGMs) have recently been fabricated under gradient magnetic fields via slip casting, based on the distinct difference in magnetic susceptibility between the components in a suspension comprised of both magnetic particles (MPs) and nonmagnetic particles (NPs). In this work, a physical model of a mixed suspension comprised of both MPs and NPs under a gradient magnetic field is built, base on which the distributions of particles in the suspension under gradient magnetic fields are studied using two-dimensional Monte Carlo simulations, and the effects of magnetic field gradient on the distributions of particles are investigated. The results show that a gradient distribution of MPs is formed along field direction, which is attributed to the translation of MPs. As the magnetic field gradient is increased, the distribution gradient of MPs increases.

Two-dimensional EPR imaging with the rapid scan and rotated magnetic field gradient

2014 ◽  
Vol 248 ◽  
pp. 126-130 ◽  
Author(s):  
T. Czechowski ◽  
W. Chlewicki ◽  
M. Baranowski ◽  
K. Jurga ◽  
P. Szczepanik ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Gradient ◽  
Magnetic Field Gradient ◽  
Two Dimensional ◽  
Rapid Scan

Domain Analysis and Magnetic Relaxation in Thin Films

1998 ◽  
Vol 09 (06) ◽  
pp. 821-825 ◽  
Author(s):  
Tatiana G. Rappoport ◽  
F. S. de Menezes ◽  
L. C. Sampaio ◽  
M. P. Albuquerque ◽  
F. Mello
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Monte Carlo ◽  
Ising Model ◽  
Monte Carlo Simulations ◽  
Magnetic Relaxation ◽  
Film Plane ◽  
Relative Strength ◽  
Two Dimensional ◽  
Magnetic Domains

We have simulated the magnetic relaxation (M(t)) and the nucleation of magnetic domains in the presence of magnetic field in thin films with anisotropy perpendicular to the film plane. We have used Monte Carlo simulations based on the two-dimensional classical Ising model including the long-range dipole–dipole and Zeeman interactions. Domains nucleated during the magnetic relaxation exhibit very rough interfaces. We analyze the roughness and the M(t) as a function of the relative strength of dipole–dipole and Zeeman terms.

scholarly journals MEASUREMENT AND MODELLING OF GRADIENT MAGNETIC FIELDS FOR BIO-CHEMICAL SEPARATION PROCESSES

2021 ◽  
Vol 5 (2) ◽  
pp. 69-80
Author(s):  
Hatice Bilgili ◽  
Teymuraz Abbasov ◽  
Yusuf Baran
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Gradient ◽  
Permanent Magnets ◽  
Magnetic Field Gradient ◽  
Chemical Separation ◽  
Submicron Particles ◽  
Separation Processes ◽  
Measuring Device ◽  
The Magnetic Field

Separation processes are widely used in chemical and biotechnical processes. Especially biomagnetic separation is an important issue among effective separation processes to separate the magnetic micron and submicron particles. It is necessary to establish and determine a high magnetic field or field gradient in the separation cell. However, it is not easy to determine the magnetic field gradient in the working region for different separation in practice. The reason for these difficulties is that the magnetic cells used in biochemical separation have different geometries and there are no simple and useful systems to easily measure these magnetic fields. Two main objectives are aimed in this study. First, a simple measuring device design can measure gradient magnetic fields with high precision of about 0,01mm and, secondly, obtain simple empirical expressions for the magnetic field. A magnetometer with Hall probes that works with the 3D printer principle was designed and tested to measure the magnetic field. Magnetic field changes were measured according to the surface coordinates on the measurement platform or measuring cell. Numerous experimental measurements of gradient magnetic fields generated by permanent magnets have been taken. The results obtained from the studies and results from the proposed empirical models were compared.

Analytical and Experimental Study of Magnetomechanical Properties of Magnetic Porous PDMS Sponge Under Non-Uniform Magnetic Fields

2020 ◽  
Vol 87 (8) ◽  
Author(s):  
Ali Shademani ◽  
Mu Chiao
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Experimental Study ◽  
Magnetic Fields ◽  
Field Gradient ◽  
Magnetic Field Gradient ◽  
Experimental Methods ◽  
Compression Tests ◽  
Magnetomechanical Coupling ◽  
The Magnetic Field

Abstract Magnetic elastomers (MEs) respond to an applied magnetic field through magnetomechanical coupling, where the mechanical properties of the MEs change with magnetic field strength. These phenomena have been mostly studied under homogenous magnetic fields due to the simplicity. In this work, the effects of the magnetic field gradient on the mechanical properties and the response of the MEs was examined. MEs are made by embedding carbonyl iron microparticles (CI) into a polydimethylsiloxane (PDMS) matrix, which is later rendered porous. The influence of the CI concentration was investigated by manipulating four different samples with CI/PDMS weight ratios of 0.2, 0.6, 1.0, and 1.4. An analytical method was proposed to further understand the interactions of the magnetic field gradient and the material’s response. The proposed theory was later verified with experimental results from compression tests in the presence of different magnetic fields. The proposed theoretical framework and experimental methods can be used to improve the design of MEs in the future.

Theoretical Modeling and Simulations of Magnetic Fluids in Gradient Magnetic Fields

2010 ◽  
Vol 146-147 ◽  
pp. 1510-1513
Author(s):  
Xiao Ling Peng ◽  
Xiao Yang ◽  
Hai Biao Wei ◽  
Rui Ping Yue ◽  
Hong Liang Ge
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Gradient ◽  
Magnetic Particles ◽  
Magnetic Field Gradient ◽  
Magnetic Fluids ◽  
Gradient Distribution ◽  
Particle Distributions ◽  
The Right ◽  
Pulsed Fields

When a magnetic field is applied to magnetic fluids (MF), various structures of MF are formed: chain-like structures in low fields, columnar, lamellar and striped structures in high fields, ellipsoidal structures in pulsed fields, and layered structures in rotating fields. The inner structures and particle distributions of MF in gradient magnetic fields are quite interesting, but very few works have been done on this. In the present study, the effects of magnetic field gradient on the structures of MF are investigated using a two-dimensional Monte Carlo simulation. The results show that a gradient distribution of magnetic particles is formed under gradient magnetic fields. Moreover, with increasing the field gradient, more magnetic particles are pushed to the right region and particle distribution changes from grass-like clusters to needle-like ones.

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