Research on the Properties of Rheology of Ni/TiO2 Group ER Fluid

2011 ◽  
Vol 214 ◽  
pp. 312-315
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Fluid Properties ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test，the relationship among shear ratio, concentration and electric field, magnetic field ,electromagnetic field on the Ni/TiO2 group electrorheological fluid properties have been analyzed. It is found that with increasing shear ratio，the property of electrorheological fluid increased for same composition ER, but there is a critical value. With increasing concentration，the property of electrorheological fluid increased for same shear ratio. Coupling electromagnetic field makes the properties improve.

Effect of Particles Size on the Properties of Nano Core-Shell Ni/TiO2 EMR Fluid

2011 ◽  
Vol 211-212 ◽  
pp. 775-779 ◽  
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Qiao Li ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Electromagnetic Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Core Shell ◽  
Fluid Properties ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test， the relationship among particle size，electric field，magnetic field ,electromagnetic field and shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties analyses. It is found that with increasing particle size， the property of electrorheological fluid decreased, and with increasing shear ratio the property of electrorheological fluid increased for same composition ER. At same time, the smaller of particle size, the higher of ER properties, but there is a critical value for shear ratio, the properties of ER is near value for same composition ER fluid. In magnetic field, the properties of ER showed a contrary result, the smaller of particle size, the lower of ER properties，and electromagnetic field make the properties increase.

Rheology Properties of Ni/TiO2/SDBS EMR Fluids

2013 ◽  
Vol 706-708 ◽  
pp. 254-257 ◽  
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Hong Zhao ◽  
Song Ji ◽  
Min Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Shear Stress ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Critical Value ◽  
Fluid Properties ◽  
The Relationship

By means of mechanical properties test，the relationship among shear ratio, concentration and electric field, magnetic field, electromagnetic field on the Ni/TiO2/SDBS EMR fluid properties have been analyzed. It had found that with increasing shear ratio，the shear stress of Ni/TiO2/SDBS EMR fluid increased for same composition, but there is a critical value. With increasing concentration，the property of EMR fluid increased for same shear ratio. Coupling electromagnetic field makes the properties improve.

Research on the Properties of Nano Core-Shell Ni/TiO2/Urea EMR Fluid

2011 ◽  
Vol 687 ◽  
pp. 519-522
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Qiao Li ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Critical Value ◽  
Core Shell ◽  
Reciprocal Effect ◽  
Fluid Properties ◽  
Shell Particles ◽  
Er Fluid

In the present paper, mechanical properties test and morphology observation，the effect among electric field, magnetic field and electromagnetic field, shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties were studied. It is found that with increasing electric field, magnetic field and shear ratio in the same composition electrorheological fluid, the property of electrorheological fluid can be increased. However, there is a critical value for shear ratio. When shear ratio is larger than 20s-1, the property of ER is nearly certain value for same composition ER fluid. Electromagnetic field reciprocal effect can increase the properties of ER fluid, and make the particles chain become thicker and interweaved each other.

Properties and Structure of Ni/TiO2/Polar Molecule Core-Shell Particles Electrorheological Fluid

2012 ◽  
Vol 512-515 ◽  
pp. 2166-2170
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Hong Zhao ◽  
Song Ji ◽  
Li Qiao ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Electrorheological Fluid ◽  
Polar Molecule ◽  
Fluid Properties ◽  
Structure Observation ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of mechanical properties test and structure observation， the relationship among electric field strength, polar molecule type, content on the Ni/TiO2group electrorheological fluid properties have been analyzed. It is found that with increasing electric field strength，the properties of electrorheological fluid increased for same composition ER fluid. Different type polar molecules have distinct effect. For same particle，with increasing polar molecule content，the property is increased, but there is a critical value . Polar molecule make particles chain of electrorheological fluid become strong，coarse and interweaved each other.

Effect of Particles Concentration on the Properties and Microstructure of Ni/TiO2 Group EMR

2012 ◽  
Vol 510 ◽  
pp. 594-598
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Electric Field ◽  
Electrorheological Fluid ◽  
Core Shell ◽  
Critical Range ◽  
Microstructure Observation ◽  
The Relationship

By means of mechanical properties test and microstructure observation,the relationship between mechanical properties ,microstructure graph of core-shell Ni/TiO2group particles concentration of EMR and different electric field, magnetic field or electric-magnetic field have been researched. It is found that with increasing of particles concentration, the properties are increased. But there is a critical range value, too high or too low particles concentrations are harmful to properties and microstructure. The best particles concentration of Ni/TiO2particles is about 30%. In the same field with increasing concentration, particles chain of electrorheological fluid under certain electric field become more strong,brawnier and interweaved each other.

Effect of Polar Molecule Urea on TiO2/Urea ER Fluid Properties and Microstructure

2011 ◽  
Vol 308-310 ◽  
pp. 503-507
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electric Field ◽  
Mass Ratio ◽  
Microstructure Observation ◽  
Urea Content ◽  
Column Structure ◽  
Fluid Properties ◽  
Dc Electric Field ◽  
Er Fluids ◽  
Er Fluid

By way of mechanical properties test and microstructure observation，the effect of Urea on TiO2particles has been researched，it has showed that ER fluid activity of the particles were closely associated with urea content. When the mass ratio of Urea/Ti is 30%, The property of TiO2/Urea particles ER fluid is the best .The microstructure observation of the ER fluids under DC electric field showed that the particles aggregated to form thicker and dense column structure when the mass ratio of Urea/Ti is 30%, while the column structure were broken down when excessive urea/Ti (>30%) was been added.

Effect of Particles Diameter on the Properties of Ni Group ER Fluid

2011 ◽  
Vol 335-336 ◽  
pp. 18-22
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Li Qiao ◽  
Hong Yan Guo ◽  
Song Ji ◽  
...  
Keyword(s):  
Shear Stress ◽  
Electric Field ◽  
Particle Diameter ◽  
Critical Value ◽  
Core Shell ◽  
Microstructure Observation ◽  
A Value ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid

By means of structure analysis, mechanical properties test and microstructure observation，structure of Ni and Ni/TiO2group particles have been obtained, the relationship among particSubscript textSubscript textle diameter，electric field strength and shear ratio of the properties of Ni/TiO2group core-shell particles ER fluid have been researched. It has been found that with increasing particle diameter，the shear stress of ER fluid decreased, and with increasing shear ratio，the shear stress of ER fluid increased for same diameter particle and composition ER fluid. At same time, the smaller of particle diameter, the higher of ER properties such as shear stress, but there is a critical value for shear ratio, when shear ratio is larger than critical value, the properties of ER is nearly a value for same composition ER fluid. Particles chain of ER fluid under certain electric field is different with diversity Ni group Particles.

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

Isotropic polyconvex electromagnetoelastic bodies

2018 ◽  
Vol 24 (3) ◽  
pp. 738-747
Author(s):  
M Šilhavý
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Electromagnetic Field ◽  
Smart Materials ◽  
Equilibrium Solution ◽  
Deformation Gradient ◽  
Electric Displacement ◽  
The Body ◽  
Sufficient Condition ◽  
Energy Functions

The recent renewal of interest in nonlinear electromagnetoelastic interactions comes from the technological importance of electro- or magnetosensitive elastomers, smart materials whose mechanical properties change instantly on the application of an electric or magnetic field. We consider materials with free energy functions of the form [Formula: see text], where F is the deformation gradient, d is the electric displacement, and b is the magnetic induction. It was recently shown by the author that such an energy function is polyconvex if and only if it is of the form [Formula: see text] where [Formula: see text] is a convex function (of 31 scalar variables). Moreover, an existence theorem was proved for the equilibrium solution for a system consisting of a polyconvex electromagnetoelastic solid plus the vacuum electromagnetic field outside the body. The condition (8), is not just the combination of Ball’s polyconvexity of elastomers [Formula: see text] with the convexity in the electromagnetic variables. The differential constraints div [Formula: see text], div [Formula: see text] allow for the cross mechanical–electric and mechanical–magnetic terms Fd and Fb which substantially enlarge the class of energies covered by the theory. The result (*), applies to a material of any symmetry; this paper analyzes the condition in the case of isotropic materials. A broad sufficient condition for the polyconvexity is given in that case. Further, it is shown that the commonly used isotropic electroelastic or magnetoelastic invariants are polyconvex except for the biquadratic ones; the paper explicitly determines their quasiconvex envelopes and shows that they are polyconvex.

A 4 × 4 array multichannel magnetic stimulation system using submillimeter sized planar square spiral coils: The spatial distribution of electromagnetic field

2022 ◽  
pp. 1-18
Author(s):  
Lei Tian ◽  
Limei Song ◽  
Yu Zheng ◽  
Jinhai Wang
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Spatial Distribution ◽  
Field Strength ◽  
Electric Field ◽  
Magnetic Stimulation ◽  
Spiral Coil ◽  
Average Magnetic Field ◽  
Stimulation System ◽  
Field Strengths

Multi-coil magnetic stimulation has advantages over single-coil magnetic stimulation, such as more accurate targeting and larger stimulation range. In this paper, a 4 × 4 array multichannel magnetic stimulation system based on a submillimeter planar square spiral coil is proposed. The effects of multiple currents with different directions on the electromagnetic field strength and the focusing zone of the array-structured magnetic stimulation system are studied. The spatial distribution characteristics of the electromagnetic field are discussed. In addition, a method is proposed that can predict the spatial distributions of the electric and magnetic fields when currents in different directions are applied to the array-structured magnetic stimulation system. The study results show that in the section of z = 2 μm, the maximum and average magnetic field strengths of the array-structured magnetic stimulation system are 6.39 mT and 2.68 mT, respectively. The maximum and average electric field strengths are 614.7 mV/m and 122.82 mV/m, respectively, where 84.39% of the measured electric field values are greater than 73 mV/m. The average magnetic field strength of the focusing zone, i.e., the zone in between the two coils, is 3.38 mT with a mean square deviation of 0.18. Therefore, the array-structured multi-channel magnetic stimulation system based on a planar square spiral coil can have a small size of 412 μm × 412 μm × 1.7 μm, which helps improving the spatial distribution of electromagnetic field and increase the effectiveness of magnetic stimulation. The main contribution of this paper is a method for designing multichannel micro-magnetic stimulation devices.

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