Electrorheological Properties of Ni-Group Nano Particles and Multilayer Compound Polar Molecule Modify

2012 ◽  
Vol 476-478 ◽  
pp. 1749-1752
Author(s):  
Suo Kui Tan ◽  
Xiao Ping Song ◽  
Song Ji ◽  
Hong Zhao ◽  
Min Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Polar Molecule ◽  
Nano Particles ◽  
Core Shell ◽  
Shell Particles ◽  
The Relationship ◽  
Er Fluid ◽  
Electrorheological Properties ◽  
Molecule Type

This paper emphasis has researched the ER properties of Ni group core-shell nano particles modifier with Urea，SDBS and other polar molecule，analysis the relationship among ER properties and polar molecule type ，compound modifier under different electric field or magnetic field. It is found that the shear stress increasing with adding polar molecule, compound polar molecule modify can marked advance the properties of Ni group core-shell particles ER fluid.

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.

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.

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.

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.

Comparison of Affecting Factors on the Shear Stress Output of Cylinder-Typed MRF Clutch

2015 ◽  
Vol 1094 ◽  
pp. 453-457
Author(s):  
Hai Feng Ji ◽  
Chun Fu Gao ◽  
Xin Sheng He ◽  
Guang Zhang
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Affecting Factors ◽  
Bingham Model ◽  
Theoretical Derivation ◽  
Proportionality Constant ◽  
Magneto Rheological ◽  
The Relationship ◽  
The Magnetic Field ◽  
Main Influence

With the purpose of studying the main influence on the cylinder-typed magneto-rheological fluid (MRF) clutch, the relationship between the output of shear stress and its affecting factors is presented in this paper; through theoretical derivation from the Bingham Model and the cylinder-typed shear model, the stress born by the MRF in the clutch is analysed, and the affecting factors on the clutch is also simulated and verified through experiments. The study shows that as the magnetic field strengthens, the shear stress of the cylinder-typed MRF clutch grows linearly, with proportionality constant at 0.162; the increase of shear rate, relevant to the magnetic field strength, makes little difference to the torque output, with proportionality constant at 0.00026B. The results indicate that mechanical-electrical integration of clutch devices can be achieved through the control of magnetic field output of the electromagnet.

scholarly journals Мёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γ-Fe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро-оболочка во внешнем магнитном поле (Часть 2)

2020 ◽  
Vol 62 (11) ◽  
pp. 1919
Author(s):  
А.С. Камзин ◽  
I.M. Obaidat ◽  
А.А. Валлиулин ◽  
В.Г. Семенов ◽  
I.A. Al-Omari
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Structure ◽  
Magnetic Moments ◽  
Core Shell ◽  
Fe2o3 Nanoparticles ◽  
Synthesis Conditions ◽  
The Core ◽  
Canted Spin ◽  
Shell Particles

The results of Mössbauer studies of the composition and magnetic structure of Fe3O4 / -Fe2O3 nanoparticles placed in an external magnetic field with a strength of 1.8 kOe, which is a continuation of the work [A.S. Kamzin, I.M. Obaidat, A.A. Valliulin, V.G. Semenov, I.A. Al-Omari. FTT No. 10/2020]. It is shown that the thickness of the maghemite (-Fe2O3) shell can be changed by the synthesis conditions. It was found that on the surface of the maghemite (-Fe2O3) shell in the Fe3O4 / -Fe2O3 nanocomposites there is a layer in which the magnetic moments are not oriented collinearly to the moments located in the depth of the shell, i.e., there is a canted spin structure. An intermediate layer in the spin-glass state is formed between the core and the shell. The data obtained on the structure of core / shell particles are important for understanding the properties of nanocomposites, which are of great interest for applications in various fields, including biomedicine.

Facile Synthesis of Nicore - Agshell Bimetallic Nano Particles for Conductive Paste

2013 ◽  
Vol 661 ◽  
pp. 42-46
Author(s):  
Wen Hua Li ◽  
Ji Min Xie ◽  
Jun Jie Jing ◽  
Hui Ru Qin ◽  
Ming Mei Zhang ◽  
...  
Keyword(s):  
Silver Ions ◽  
Nano Particles ◽  
Core Shell ◽  
Narrow Size Distribution ◽  
Facile Synthesis ◽  
Transmission Electron ◽  
Potential Applications ◽  
Shell Particles ◽  
Fcc Structure ◽  
Silver Shell

Ni-Ag core-shell nano particles have been facilely prepared by redox-transmetalation reaction of silver ions on the surface of nickle nano particles. As characterized by transmission electron microscopy (TEM), the as-synthesized core-shell particles were mono-dispersed and exhibited a narrow size distribution ranging from 200nm to 300nm. XRD analyses indicated both Ni core and Ag shell had an fcc structure. Furthermore, the thickness of silver shell was controllable via changing the mole ratio of Ag to Ni, which could show benefits for potential applications in optical, catalytic and electronic fields.

EFFECT OF RARE EARTH SUBSTITUTION ON ELECTRORHEOLOGICAL PROPERTIES OF TiO2

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2371-2377 ◽  
Author(s):  
X. P. ZHAO ◽  
J. B. YIN ◽  
L. Q. XIANG ◽  
Q. ZHAO
Keyword(s):  
Shear Stress ◽  
Rare Earth ◽  
Silicone Oil ◽  
Anatase Phase ◽  
New Class ◽  
Dc Electric Field ◽  
Er Fluids ◽  
Er Fluid ◽  
Electrorheological Properties ◽  
Rare Earth Substitution

This paper describes a new class of water-free electrorheological (ER) fluids based on nonaqueous doped TiO 2 with rare earth (RE) in silicone oil. The thermal character and crystal structure of these materials are investigated with DSC, TG and XRD. The doped TiO 2 crystals possess anatase phase and their lattice spacing varies significantly with the content of rare earth. The rheological measurements show that the doped TiO 2 ER fluid exhibits an obviously higher shear stress than that of pure TiO 2 ER fluid under dc electric field. Especially, substitution with 10mol% cerium or 8mol% lanthanum for Ti can obtain a relatively high shear stress. On the basis of dielectric and conduction measurements, we preliminarily discuss the influence of the doping of rare earth on ER effects of TiO 2.

Analysis of Removal Rate by Using Magnetorheological Finishing Based on Hysteresis Shear Stress Model

2013 ◽  
Vol 470 ◽  
pp. 250-254
Author(s):  
Guang Yang ◽  
Cheng Liang Zhang
Keyword(s):  
Magnetic Field ◽  
Shear Stress ◽  
Magnetic Particles ◽  
Removal Rate ◽  
Mathematics Model ◽  
Stress Model ◽  
Magnetorheological Finishing ◽  
Experimental Values ◽  
The Mathematical Model ◽  
The Relationship

Under the effect of magnetic field, the removing material will produce by using magnetorheo1ogica1 fluid with contains hard magnetic particles or polishing powder, when the magnetorheo1ogica1 fluid moving relative to the workpiece. Magnetorheological finishing is a promising technology for manufacturing super-smooth components surface. According to Preston equation, mathematics model of magnetorheo1ogica1 fluid is established with the hysteresis shear stress model which composed of viscous and bilinear hysteresis shear stress model. After discussing the relationship between magnetic field and material removal studied, the results show that hysteresis shear stress model can describe the mechanical behavior of magnetorheo1ogica1 fluid perfectly and it is simple in form, explicit and easy to apply. Calculated value is consistent with the experimental values and the mathematical model is thus capable to play a guiding role in processing.

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