scholarly journals STRONG MAGNETIC FIELD INDUCED SEGREGATION AND SELF-ASSEMBLY OF MICROMETER SIZED NON-MAGNETIC PARTICLES

2010 ◽  
Vol 23 ◽  
pp. 199-214 ◽  
Author(s):  
Zhi Sun ◽  
Muxing Guo ◽  
Jef Vleugels ◽  
Omer Van der Biest ◽  
Bart Blanpain
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Self Assembly ◽  
Magnetic Particles

scholarly journals Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 714 ◽  
Author(s):  
Yu Fu ◽  
Jianjun Yao ◽  
Honghao Zhao ◽  
Gang Zhao ◽  
Zhenshuai Wan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Graphite Oxide ◽  
Self Assembly ◽  
Carbonyl Iron ◽  
Magnetic Particles ◽  
Dispersion Stability ◽  
Functional Coating ◽  
Enhancing Effect ◽  
Mr Fluids

The magnetorheology and dispersion stability of bidisperse magnetic particles (BMP)-based magnetorheological (MR) fluids were improved by applying a novel functional coating composed of gelatin and graphite oxide (GO) to the surfaces of the micron-sized carbonyl iron (CI) and nanoparticles Fe3O4. Gelatin acted as a grafting agent to reduce the aggregation and sedimentation of CI particles and prevent nanoparticles Fe3O4 from oxidation. In addition, a dense GO network on the surface of gelatin-coated BMP was synthesized by self-assembly to possess a better MR performance and redispersibility. The rheological properties of MR fluids containing dual-coated BMP were measured by a rotational rheometer under the presence of magnetic field and their dispersion stability was examined through sedimentation tests. The results showed that CI@Fe3O4@Gelatin@GO (CI@Fe3O4@G@GO) particles possessed enhanced MR properties and dispersion stability. In addition, the nanoparticle-enhancing effects on the dispersion stability of BMP-based MR fluids were investigated using Monte Carlo simulations.

scholarly journals Self-assembly of smallest magnetic particles

2015 ◽  
Vol 112 (47) ◽  
pp. 14484-14489 ◽  
Author(s):  
Sara Mehdizadeh Taheri ◽  
Maria Michaelis ◽  
Thomas Friedrich ◽  
Beate Förster ◽  
Markus Drechsler ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Data Storage ◽  
Self Assembly ◽  
Magnetic Particles ◽  
Dipole Interaction ◽  
The Self ◽  
Magnetic Structures ◽  
Medical Technologies ◽  
1D Chains

The assembly of tiny magnetic particles in external magnetic fields is important for many applications ranging from data storage to medical technologies. The development of ever smaller magnetic structures is restricted by a size limit, where the particles are just barely magnetic. For such particles we report the discovery of a kind of solution assembly hitherto unobserved, to our knowledge. The fact that the assembly occurs in solution is very relevant for applications, where magnetic nanoparticles are either solution-processed or are used in liquid biological environments. Induced by an external magnetic field, nanocubes spontaneously assemble into 1D chains, 2D monolayer sheets, and large 3D cuboids with almost perfect internal ordering. The self-assembly of the nanocubes can be elucidated considering the dipole–dipole interaction of small superparamagnetic particles. Complex 3D geometrical arrangements of the nanodipoles are obtained under the assumption that the orientation of magnetization is freely adjustable within the superlattice and tends to minimize the binding energy. On that basis the magnetic moment of the cuboids can be explained.

Induced migration of non-magnetic particles and fabrication of metallic-based graded materials by applying a strong magnetic field

2011 ◽  
Vol 109 (8) ◽  
pp. 084917 ◽  
Author(s):  
Z. Sun ◽  
M. Guo ◽  
J. Vleugels ◽  
B. Blanpain ◽  
O. Van der Biest
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Magnetic Particles ◽  
Graded Materials

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

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