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electrorheological fluid of kaolinite-based ternary nanocomposite and its properties

Science China(Technological Sciences) 2005年第5期48卷 496-509页

作者： WANG Baoxiang ZHAO Xiaopeng YAO Yuan Institute of electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China Institute of Electrorheological Technology Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

According to the physical and chemical design, a kind of kaolinite /dimethylsulfoxide/carboxymethyl starch (CMS) ternary nanocomposite was prepared by the two-step composite method. Firstly, the polar liquid-dimethylsulfoxide (DMSO) was directly intercalated into the interlayer of kaolinite, and then the intercalated complex was composite with CMS by the solution method. The results showed that DMSO moderately intercalated the interlayer of kaolinite and the basal spacing of kaolinite was swollen from 0.715 to 1.120 nm. Under the electric fields of 5 kV mm-1 and volume fraction 30%, the static shear stress of kaolinite/DMSO/CMS ternary ERF could reach 17 kPa, which was 14 times and 4.25 times higher than that of pure kaolinite ERF and kaolinite/CMS ERF respectively. At the suitable component ratio (kaolinite:DMSO:CMS=1:0.75:0.6) of nanocomposite, a stronger synergetic effect and the optimum electrorheological effect could be attained. The ternary nanocomposite ERF also had good temperature effect and sedimentation properties. The sedimentation part of ternary nanocomposite ERF was only 9% after 30 days. The results of dielectric properties showed that the dielectric constant and conductivity of ternary nanocomposite ERF had been improved more enormously than that of the single component ERF and binary composite ERF. So the polarization and dielectric mismatch were strengthened, which was suitable to the enhancement of ER effect.

关键词： electrorheological fluid, intercalation, ternary system, nanocomposite.

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Effect of surfactant on the dielectric and electrorheological properties of zinc borate/silicone oil dispersions

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1523-1530页

作者： Omer Yunus Gumus Halil Ibrahim Unal Bursa Technical University Engineering and Natural Sciences FacultyFiber and Polymer Engineering DepartmentBursa 16310Turkey Gazi University Science FacultyChemistry DepartmentSmart Materials Research Lab.Ankara 06500Turkey

Zinc borate(ZB)particles dispersed in silicone oil(SO)at concentrations of φ=5vol%-20vol% were subjected to dielectric analysis to elucidate their polarization strength,time,and *** revealed that all virgin dispersions lacked *** X-100,a non-ionic surfactant,was added to ZB/SO dispersions to enhance the polarizability of ZB *** addition of 1vol% Triton X-100 enhanced the polarizability of ZB/SO dispersions,and the 15vol% ZB/SO system provided the highest dielectric difference Δε′(the difference in ε′values at zero and infinite frequency,Δε′=ε0–ε∝)of *** electrorheological(ER)activities of the ZB/SO/Triton-X dispersion system were determined through the ER response test,and viscoelastic behaviors were investigated via oscillation tests.A recoverable deformation of 36% under an applied electrical field strength of 1.5 kV/mm was detected through creep and creep recovery tests.

关键词： zinc borate electrorheological fluids dielectric analysis surfactant

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Dynamics simulation of electrorheological suspensions in poiseuille flow field

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Journal of Central South University 2008年第S1期15卷 234-238页

作者：朱石沙罗成周杰陈娜 College of Mechanical Engineer Xiangtan University Changshu Institute of Technology

Based on a modified Maxwell-Wagner model,molecular dynamics is carried out to simulate the structural changes of ER(electrorheological) suspensions in a poiseuille flow *** simulation results show that the flow assists in the collection of particles at the electrodes under a low pressure gradient,and the negative ER effect will show under a high pressure *** analyzing the relationship curves of the shear stress and the pressure gradient in different relaxation time,it is found that for the same kind of ER suspensions materials,there is an optimal dielectric relaxation frequency.

关键词： electrorheological suspensions molecular dynamics pressure gradient value relaxation time.

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Preparation and electrorheological Response of PAL/TiO_(2)/PANI Nanorods

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Journal of Renewable Materials 2021年第10期9卷 1707-1715页

作者： Ling Wang Chenchen Huang Ping Zhang Fenghua Liu Ting Zou Zhixiang Li Jianfei Zhang Gaojie Xu Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo315201China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Xuyi County Attapulgite Application Technology R&D and Achievement Transformation Center Xuyi211700China

Using palygorskite(PAL)as template,the PAL/TiO_(2)/PANI nano-rods were synthesized by heterogeneous precipitation and in-situ *** synthesized PAL/TiO_(2)/PANI nanorods were used as a novel electrorheological(ER)fluid by mixing with silicone oil,which showed excellent ER *** yield stress of the PAL/TiO_(2)/PANI based ER fluid(15 vol%)reached 8.8 kPa under 4 kV mm^(−1) electric *** dynamic shear stress of the PAL/TiO_(2)/PANI based ER fluid could maintain a stable level in the shear rate range of 0.1–100 s^(−1).Furthermore,the PAL/TiO_(2)/PANI ER fluid exhibited excellent suspension stability.

关键词： electrorheological palygorkite titanium oxide polyaniline nanorod

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NONLINEAR　HYSTERIC　DAMPING　MODEL　OF　electrorheological　FLUIDS

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Chinese Journal of Mechanical Engineering 1997年第1期10卷 25-31页

ＮＯＮＬＩＮＥＡＲＨＹＳＴＥＲＩＣＤＡＭＰＩＮＧＭＯＤＥＬＯＦＥＬＥＣＴＲＯＲＨＥＯＬＯＧＩＣＡＬＦＬＵＩＤＳＬｉＰｅｉｙｕ，ＣｈｅｎＹａｏｄｏｎｇ，ＺｈｕＪｉａｎｓｈｅｎＺｈｅｊｉａｎｇＵｎｉｖｅｒｓｉｔｙＡｂｓｔ... 详细信息

ＮＯＮＬＩＮＥＡＲＨＹＳＴＥＲＩＣＤＡＭＰＩＮＧＭＯＤＥＬＯＦＥＬＥＣＴＲＯＲＨＥＯＬＯＧＩＣＡＬＦＬＵＩＤＳＬｉＰｅｉｙｕ，ＣｈｅｎＹａｏｄｏｎｇ，ＺｈｕＪｉａｎｓｈｅｎＺｈｅｊｉａｎｇＵｎｉｖｅｒｓｉｔｙＡｂｓｔｒａｃｔｏｎｔｈｅｂａｓｉｓｏｆｄ...

关键词：非线性减振器 HYSTERIC MODEL electrorheological FLUIDS OF NONLINEAR 振动工程学报 DAMPING

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Facile Synthesis of Polypyrrole/Titanate Core-Shell Nanorods and Their electrorheological Characteristics

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Materials Sciences and Applications 2011年第2期2卷 111-115页

作者： Jiexu Zhang Ying He Lijun Ji 不详

In this work, polypyrrole (PPy)/titanate (TN) composite nanorods were successfully synthesized using cetyl trimethyl-ammonium bromide (CTAB) as a structure-directing agent by in situ chemical oxidative polymerization. The structural characterization indicated that the new composite rods were core (TN)-shell (PPy) nanostructure with the average diameter in the range of 250-300 nm. Further, this semiconducting composite can be used as a dispersed phase in silicone oil for a new electrorheological (ER) fluid, and its ER behavior was investigated under steady and oscillatory shear. It was found that the PPy/TN fluid showed typical ER characteristics under an external electric field.

关键词： Polypyrrole Titanate Nanorods Conducting Composite electrorheological Fluid Viscoelastic Properties

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Sedimentation upon different carrier liquid in giant electrorheological fluid

Sedimentation upon different carrier liquid in giant electro...

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第十二届全国流变学学术会议

作者： YAYING Hong WEIJIA Wen Department of Physics the Hong Kong University of Science and Technology

Colloidal stability in giant electrorheological(GER)fluid can influence the GER performance and the fluid flow *** investigated the sedimentation effect of the GER particles suspended in var

关键词： giant electrorheological sedimentation oil synergistic

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Electromechanical Properties of Ethylene Propylene Diene Elastomers: Effect of Ethylene Norbornene Content

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Materials Sciences and Applications 2011年第5期2卷 307-313页

作者： Patcharee Intanoo Anuvat Sirivat Ruksapong Kunanuruksapong Wanchai Lerdwijitjarud 不详

Ethylene propylene diene elastomers (EPDM) of various side chains and molecular weights were prepared as thin discs and the effects of electric field strength and temperature on the electromechanical properties were investigated. The electrical conductivity, the dielectric constant, the storage and loss moduli (G' and G'), the storage modulus response (ΔG’1000 V/mm), and the storage modulus sensitivity (ΔG’1000 V/mm/G’0) of the elastomers of different ethylene norbornene (ENB) contents and molecular weights were measured under electric field strengths varying from 0 V/mm to 1000 V/mm and at temperatures between 300 K and 380 K. The storage modulus response and sensitivity increase with increasing molecular weight and dielectric constant, consistent with the existing theory. However, for the case of EPDMs with different ENB contents, the storage modulus response and sensitivity vary inversely with the dielectric constant. EDPM is potentially a new type of electroactive materials.

关键词： Dielectric Elastomer Dipole Moment Polar Molecule Unsaturated Structure Ethylene Propylene Diene Elastomers (EPDM) electrorheological Properties

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Effect of Electric Field Strength and Water Content on the Electrorheology of Silica Dispersions

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Materials Sciences and Applications 2017年第4期8卷 281-290页

作者： Habauka M. Kwaambwa Faculty of Health and Applied Sciences Namibia University of Science and Technology Windhoek Namibia

The effect of water content on the electrorheological effect (ERE) behaviour of silica dispersions has been investigated. The types of silica powders were fumed silica, precipitated and acid washed silica and colloidal silica. Silica dispersions with a water content varying in the range 10% - 30%, and with conducting ions deliberately added, were redispersed in chlorinated hydrocarbon oil and then the ER behaviour studied. Samples were tested on a static yield rig (SYR), an instrument which can measure both the yield stress and the conductivity. The effects of electric field strength and water content on the ERE were studied. The yield stress initially increased with increase in electric field strength and then decreased at high electric fields suggesting a breakdown in structure of the electrorheological fluid samples tested. It was also found that the ERE increased and electric saturation or electric breakdown shifted to lower electric fields as the water content increased. Higher electric fields caused a drop in the ERE.

关键词： Colloidal Silica electrorheological Effect electrorheological Fluid Fumed Silica Precipitated and Acid Washed Silica Static Yield Rig Yield Stress

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Preparation and Analysis of Porous Oxychloride Titanium Oxide Precursor Material

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Journal of Applied Mathematics and Physics 2019年第8期7卷 1599-1605页

作者： Mingchun Jiao Jing Wang Xianfang Yue Yinping Zhou Xiao Sun Department of Physics and Information Engineering Jining University Qufu China

Oxychloride titanium oxide precursor material is one of the key substances produced by the giant electrorheological effect. In this paper, tetrabutyl titanate and oxalic acid and anhydrous ethanol are used to prepare porous titanyl oxalate precursor powder by precipitation method. The materials, morphology and grain size were analyzed by X-ray diffraction and electron microscope method. Conductivity was measured by a four-probe method, and then the infiltration property of water and silicone oil on the surface of the powder was investigated. The results show that Oxychloride titanium oxide precursor has good wettability to water and silicone oil. The wettability has little to do with the bath temperature and the pH of the solution. The contact angle of water on oxychloride titanium oxide precursor surface does not change greatly with the change of the bath temperature and pH, ranging from 26.8? to 31.1?. Similarly, the contact angle of silicone oil on the surface of the sample ranges from 9.5? to 11.5?. So, silicone oil has better wettability on the surface of the sample than water. Porous titanium oxalate is an insulating material having a resistivity more than 1 GΩ?cm. Oxychloride titanium oxide precursor is poor thermal stability, and it breaks down to generate TiO2 when the temperature is higher than 70?C.

关键词： Itanium Oxalate electrorheological Fluid Coprecipitation

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