ELECTRORHEOLOGICAL PROPERTIES OF TITANIA PARTICLE WITH CE AND Y COMPOSITE DOPING AS AN ANHYDROUS ER FLUID

Magnetic and semiconducting Fe3O4/poly(o-anisidine) (POA) core/shell composite particles were fabricated by an oxidation process using Fe3O4 synthesized separately. The dispersion stability in a liquid medium and the electrical conductivity of synthesized particles were improved because of the conductive POA polymeric shell. The morphological, microstructural, compositional/elemental, and thermal behaviors of the particles were characterized using SEM with energy dispersive X-ray spectroscopy, TEM, XRD, and thermogravimetric analysis, respectively. A smart electro-magneto-rheological suspension containing Fe3O4/POA particles with two functionalities, magnetism and conductivity, was prepared. Its electrorheological properties were investigated at different electric field strengths using a rotational rheometer. Without an electric field, the sample demonstrated typical Newtonian fluid behavior, as expected. However, while under the electric field, it exhibited a solid-like behavior, and the dynamic (or elastic) yield stress of the ER fluid increased linearly as a function of the electric field strength in a power-law function with an index of 2.0, following the polarization mechanism.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1749 ◽

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.

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Electrorheological Properties of Suspensions Based on Polyaniline-montmorillonite Clay Nanocomposite

Journal of Materials Research ◽

10.1557/jmr.2002.0225 ◽

2002 ◽

Vol 17 (6) ◽

pp. 1513-1519 ◽

Cited By ~ 25

Author(s):

Jun Lu ◽

Xiaopeng Zhao

Keyword(s):

Dielectric Constant ◽

Dielectric Loss ◽

Yield Stress ◽

Electric Fields ◽

High Dielectric Constant ◽

Silicone Oil ◽

Transmission Electron ◽

High Dielectric ◽

Er Fluid ◽

Electrorheological Properties

It is thought that high-dielectric constant, suitable conductivity, and dielectric loss dominate electrorheological (ER) effects. According to this viewpoint, the polyaniline/montmorillonite nanocomposite (PANI-MMT) particles with high-dielectric constant and suitable conductivity were synthesized by an emulsion intercalation method. The electrorheological properties of the suspensions of PANI-MMT particles in silicone oil have been investigated under direct current electric fields. At room temperature, it was found that the yield stress of PANI-MMT ER fluid was 7.19 kPa in 3 kV/mm, which is much higher than that of pure polyaniline (PANI), that of pure montmorillonite (MMT) as well as that of the mixture of polyaniline with clay (PANI+MMT). In the range of 10–100 °C, the yield stress changed only 6.5% with the variation of temperature. The sedimentation ratio of PANI-MMT ERF was about 98% after 60 days. The structure of PANI-MMT particles was characterized by infrared, x-ray diffraction (XRD), and transmission electron microscopy (TEM) spectrometry, respectively. The XRD spectra show that the inner layer distance of PANI-MMT can be enhanced to 1.52 nm when the PANI was inserted into the interlayer of MMT, whereas it is only 0.96 nm for free MMT. TEM shows that the diameter of PANI-MMT particles is about 100 nm. The dielectric constant of PANI-MMT nanocomposite was increased 5.5 times that of PANI and 2.7 times that of MMT, besides, the conductivity of PANI-MMT particle was increased about 8.5 times that of PANI at 1000 Hz. Meanwhile, the dielectric loss tangent can also be increased about 1.7 times that of PANI. It is apparent that the notable ER effect of PANI-MMT ER fluid was attributed to the prominent dielectric property of the polyaniline-montmorillonite nanocomposite particles.

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EFFECT OF RARE EARTH SUBSTITUTION ON ELECTRORHEOLOGICAL PROPERTIES OF TiO2

International Journal of Modern Physics B ◽

10.1142/s0217979202012384 ◽

2002 ◽

Vol 16 (17n18) ◽

pp. 2371-2377 ◽

Cited By ~ 15

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.

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ER-FLUID RHEOLOGICAL PROPERTIES IN TERMS OF THE MULTIPARTICLE MODEL OF A COMPOSITE

International Journal of Modern Physics B ◽

10.1142/s0217979202012839 ◽

2002 ◽

Vol 16 (17n18) ◽

pp. 2676-2682

Author(s):

YU. G. YANOVSKY ◽

V. E. ZGAEVSKII ◽

Z. P. SHULMAN ◽

E. V. KOROBKO

Keyword(s):

Electric Field ◽

Rheological Properties ◽

Three Dimensional ◽

Microscopic Theory ◽

Electrorheological Fluids ◽

Mathematical Apparatus ◽

Couple Interaction ◽

Er Fluids ◽

Er Fluid ◽

Electrorheological Properties

The three-dimensional multi-particle well-ordered model could be considered as an analogy to a crystal body. We use this model for describing rheological properties of concentrated electrorheological fluids (ER fluids). According to this model, the particles of the suspension take their places at sites of a grid with specified type of symmetry and then an electric field is applied to the fluid. Taking into account hydrodynamic couple interaction of particles and forces of electrostatic interaction of particles polarized under the action of an external electric field and employing the mathematical apparatus of the microscopic theory of crystals, we construct the basic relationships for describing viscoelastic electrorheological properties of ER fluids.

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

International Journal of Modern Physics B ◽

10.1142/s0217979299001983 ◽

1999 ◽

Vol 13 (14n16) ◽

pp. 1931-1939 ◽

Cited By ~ 9

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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Protein functionalized titania particle as a nanocarrier in a multiple signal antibody amplification strategy for ultrasensitive chemiluminescent immunoassay

Talanta ◽

10.1016/j.talanta.2011.12.003 ◽

2012 ◽

Vol 88 ◽

pp. 765-768 ◽

Cited By ~ 14

Author(s):

Zhenxing Wang ◽

Jing Han ◽

Hongfei Gao ◽

Cuifang Li ◽

Zhifeng Fu

Keyword(s):

Titania Particle ◽

Multiple Signal ◽

Chemiluminescent Immunoassay ◽

Amplification Strategy

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A comparative study of the electrorheological properties of various N-doped nanomaterials using ammonia plasma treatment

Chemical Communications ◽

10.1039/c5cc10201d ◽

2016 ◽

Vol 52 (26) ◽

pp. 4808-4811 ◽

Cited By ~ 14

Author(s):

Chang-Min Yoon ◽

Gyeongseop Lee ◽

Jungchul Noh ◽

Choonghyeon Lee ◽

Oug Jae Cheong ◽

...

Keyword(s):

Comparative Study ◽

Plasma Treatment ◽

Ammonia Plasma ◽

Doped Nanomaterials ◽

Electrorheological Properties

Nanomaterials with different morphologies, sizes, and compositions are successfully treated by ammonia plasma to exhibit significantly enhanced electrorheological (ER) performance.

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