POLAR MOLECULE TYPE ELECTRORHEOLOGICAL FLUIDS

2007 ◽  
Author(s):  
KUNQUAN LU ◽  
RONG SHEN ◽  
XUEZHAO WANG ◽  
GONG SUN ◽  
WEIJIA WEN ◽  
...  
Keyword(s):  
Polar Molecule ◽  
Electrorheological Fluids ◽  
Molecule Type

POLAR MOLECULE TYPE ELECTRORHEOLOGICAL FLUIDS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4798-4805 ◽  
Author(s):  
KUNQUAN LU ◽  
RONG SHEN ◽  
XUEZHAO WANG ◽  
GANG SUN ◽  
WEIJIA WEN ◽  
...  
Keyword(s):  
Electric Field ◽  
High Performance ◽  
Polar Molecule ◽  
Electrorheological Fluids ◽  
High Yield ◽  
Polar Molecules ◽  
Dynamic Shear ◽  
Effective Factors ◽  
Er Fluids ◽  
Molecule Type

The static and dynamic shear stress of newly developed electrorheological (ER) fluids can reach more than 100 kPa and over 60 kPa at 3 kV/mm, respectively. The high yield stress of those ER fluids and its near linear dependence on the electric field are different from the conventional ER fluids and can not be explained with traditional dielectric theory. Experiment demonstrates that the polar molecules adsorbed on the particles play crucial role in those ER fluids, which can be named as polar molecule type electrorheological (PM-ER) fluids. To explain PM-ER effect a model is proposed based on the interaction of polar molecule-charge in between the particles, where the local electric field is much higher than the external one and can cause the polar molecules aligning. The main effective factors for achieving high-performance PM-ER fluids are discussed.

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.

scholarly journals The electrode effect on polar molecule dominated electrorheological fluids

2009 ◽  
Vol 30 (10) ◽  
pp. 4521-4524 ◽  
Author(s):  
X.Z. Wang ◽  
R. Shen ◽  
D. Wang ◽  
Y. Lu ◽  
K.Q. Lu
Keyword(s):  
Polar Molecule ◽  
Electrorheological Fluids ◽  
Electrode Effect

The methods for measuring shear stress of polar molecule dominated electrorheological fluids

2007 ◽  
Vol 102 (2) ◽  
pp. 024106 ◽  
Author(s):  
R. Shen ◽  
X. Z. Wang ◽  
Y. Lu ◽  
W. J. Wen ◽  
G. Sun ◽  
...  
Keyword(s):  
Shear Stress ◽  
Polar Molecule ◽  
Electrorheological Fluids

Polar-Molecule-Dominated Electrorheological Fluids Featuring High Yield Stresses

2009 ◽  
Vol 21 (45) ◽  
pp. 4631-4635 ◽  
Author(s):  
Rong Shen ◽  
Xuezhao Wang ◽  
Yang Lu ◽  
De Wang ◽  
Gang Sun ◽  
...  
Keyword(s):  
Polar Molecule ◽  
Electrorheological Fluids ◽  
High Yield

Coating of Polyaniline with an Insulating Polymer to Improve the Power Efficiency of Electrorheological Fluids

1999 ◽  
Vol 13 (14n16) ◽  
pp. 1931-1939 ◽  
Author(s):  
J. Akhavan ◽  
K. Slack ◽  
V. Wise ◽  
H. Block
Keyword(s):  
Power Efficiency ◽  
Electrorheological Fluids ◽  
Emeraldine Base ◽  
Heavy Duty ◽  
Base Form ◽  
Static Yield ◽  
High Fields ◽  
Er Fluids ◽  
Er Fluid ◽  
A Current

Currents drawn under high fields often present practical limitations to electrorheological (ER) fluids usefulness. For heavy-duty applications where large torques have to be transmitted, the power consumption of a ER fluid can be considerable, and for such uses a current density of ~100μ A cm -2 is often taken as a practical upper limit. This investigation was conducted into designing a fluid which has little extraneous conductance and therefore would demand less current. Selected semi-conducting polymers provide effective substrates for ER fluids. Such polymers are soft insoluble powdery materials with densities similar to dispersing agents used in ER formulations. Polyaniline is a semi-conducting polymer and can be used as an effective ER substrate in its emeraldine base form. In order to provide an effective ER fluid which requires less current polyaniline was coated with an insulating polymer. The conditions for coating was established for lauryl and methyl methacrylate. Results from static yield measurements indicate that ER fluids containing coated polyaniline required less current than uncoated polyaniline i.e. 0.5μ A cm -2. The generic type of coating was also found to be important.

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