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Induced dipole dominant giant electrorheological fluid 被引量:1
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作者 沈容 陆坤权 +1 位作者 邱昭晖 熊小敏 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第7期548-557,共10页
Traditional dielectric electrorheological fluid(ER)is based on the interaction of dielectric particle polarization,and the yield stress is low,which cannot meet the application requirements.The giant ER(GER)effect is ... Traditional dielectric electrorheological fluid(ER)is based on the interaction of dielectric particle polarization,and the yield stress is low,which cannot meet the application requirements.The giant ER(GER)effect is caused by orientations and interactions of polar molecules adsorbed on the particle surfaces.Despite the high yield stress,these polar molecules are prone to wear and fall off,resulting in a continuous reduction in shear stress of GER liquid,which is also not suitable for application.Here we introduce a new type of ER fluid called induced dipole dominant ER fluid(ID-ER),of which the particles contain oxygen vacancies or conductor microclusters both prepared by high energy ball milling(HEBM)technique.In the electric field E,oxygen vacancies or conductor microclusters form induced dipoles.Because the local electric field E_(loc) in the gaps between particles can be two to three orders of magnitude larger than E,the induced dipole moments must be large.The strong interactions of these induced dipoles make the yield stress of the ID-ER fluid reaching more than 100 kPa.Since there are oxygen vacancies or conductor microclusters everywhere in the particles,the particles will not lose the function due to surface wear during use.The experimental results show that the ID-ER fluid possesses the advantages of high shear stress,low current density,short response time,good temperature stability,long service life,and anti-settlement,etc.The comprehensive performance is much better than the existing ER materials,and also the preparation method is simple and easy to repeat,thus it should be a new generation of ER fluid suitable for practical applications. 展开更多
关键词 electrorheological fluid induced dipole VACANCIES high energy ball milling
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Design and Preparation of Electrorheological Fluid Materials and Their Rheological Properties and Performance Characteristics 被引量:2
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作者 Jian-hua Zhang Zhi-ming Zhang De-hua Tao 《Advances in Manufacturing》 2000年第3期243-245,共3页
关键词 electrorheological(er) material CHITOSAN hollow cenosphere composite particles performance properties
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New Dispersed Phase of Electrorheological Fluids:TiO_2 Coating Graphite Particles 被引量:2
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作者 Sujuan XU+ and Biao WANG (Harbin Institute of Technology, Harbin 150001, China) Shouqiang MEN and Kunquan LU (Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第5期529-530,共2页
We have prepared novel coated particles, with a conductor graphite core and a dielectric TiO2 coating, as the dispersed phase of electrorheological fluids. One order of magnitude enhancement in the shear stress is obt... We have prepared novel coated particles, with a conductor graphite core and a dielectric TiO2 coating, as the dispersed phase of electrorheological fluids. One order of magnitude enhancement in the shear stress is obtained by using such composite particles, when it is compared with that of TiO2 particles. The experimental results show a way to get excellent ER system. 展开更多
关键词 New Dispersed Phase of electrorheological fluids GRAPHITE TIO
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PERCOLATION TRANSITION IN ELECTRORHEOLOGICAL FLUIDS
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作者 郝田 陈一泓 +2 位作者 徐振淼 许元泽 黄畇 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1994年第2期97-105,共9页
The electric conductivity, dynamic modulus and yield stress of the developed electrorheolo-gical fluid (ERF) are measured at different volume fraction and different electric field strengthusing a modified Rheometrics ... The electric conductivity, dynamic modulus and yield stress of the developed electrorheolo-gical fluid (ERF) are measured at different volume fraction and different electric field strengthusing a modified Rheometrics Mechanical Spectrometer (Model 605). The percolation theory isintroduced to explain electrorheological effect and found that the ERF′s have the similarpercolated network structure as that of other ordinary suspensions with a critical volume fractionvalue independent of electric field strength. A master curve of dimensionless modulus againstdimensionless volume fraction is obtained. which shows that the essence of ER phenomenonactually is one kind of the second ofder phase transition. 展开更多
关键词 electrorheological fluid SUSPENSION Critical volume fraction PerCOLATION
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A New Modified Conductivity Model for Prediction of Shear Yield Stress of Electrorheological Fluids Based on Face-center Square Structure
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作者 谭柱华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第4期91-94,共4页
A new modified conductivity model was established to predict the shear yield stress of electrorheological fluids (ERF). By using a cell equivalent method, the present model can deal with the face-center square structu... A new modified conductivity model was established to predict the shear yield stress of electrorheological fluids (ERF). By using a cell equivalent method, the present model can deal with the face-center square structure of ERF. Combining the scheme of the classical conductivity model for the single-chain structure, a new formula for the prediction of the shear yield stress of ERF was set up. The influences of the separation distance of the particles, the volume fraction of the particles and the applied electric field on the shear yield stress were investigated. 展开更多
关键词 electrorheological fluids face-center square structure equivalent cell conductivity model shear yield stress
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Smart Property of Homogeneous Electrorheological Fluid and Its Application in Reducing Seismic Responses of Engineering Structures
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作者 瞿伟廉 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第3期70-74,共5页
The smart properties of homogeneous electrorheological fluid (HERF) containing side-chain type liquid crystalline polymer were studied and an actual HERF damper with an adjustable viscosity was produced.A mechanical m... The smart properties of homogeneous electrorheological fluid (HERF) containing side-chain type liquid crystalline polymer were studied and an actual HERF damper with an adjustable viscosity was produced.A mechanical model of the HERF smart damper was established on the basis of experiment and theoretical analysis.Then a controlled equation of SDOF structure by HERF damper was derived and a semi active control strategy based on optimal sliding displacement of damper was presented.The simulation results for a single story frame structure indicate that HERF,which may avoid some defects of common particles suspended ER fluids,is an excellent smart material with better stability.Using the semi active control strategy presented,HERF smart damper controlled could effectively reduce seismic responses of structures and keeps the control stable at all times. 展开更多
关键词 smart materials homogeneous electrorheological fluid intelligent structure
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RESEARCH ON BEHAVIORS OF ELECTRORHEOLOGICAL FLUID-BASED SEMIACTIVE ROBOT FINGERTIPS 被引量:1
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作者 Yue Hong Li Tiejun Department of Mechanical Engineering, Hebei University of Technology Peng Yuqing Cai Hegao Hebei University of Technology Harbin Institute of Technology 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1998年第2期17-22,29,共7页
A new design of robot gripper with electrorheological fluid (ERF) semiactive tips is described. There are two remarkable properties using this fingertip. One is the higher lifting capability at little grasp force, whi... A new design of robot gripper with electrorheological fluid (ERF) semiactive tips is described. There are two remarkable properties using this fingertip. One is the higher lifting capability at little grasp force, which can realize stable grasp. Another is the damping controllable which can be used for controlling contact forces. A viscoelastic plastic model for normal direction of the fingertip is proposed to explore the contact behavior. The electric field strength is induced into the dynamic model of contact transition for simulations. The simulation results and conclusions are given. 展开更多
关键词 ROBOT Semiactive fingertip electrorheological fluid Dynamic model SIMULATION
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Influence of the Dosage of Surfactant on the Electrorheological Behaviors of Fluids
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作者 张少华 张玉玲 《Journal of Beijing Institute of Technology》 EI CAS 2001年第3期312-315,共4页
To investigate the influence of surface characteristics of particles on electrorheological (ER) fluids, water free complex strontium titanate particles were synthesized through the sol gel technique and different ma... To investigate the influence of surface characteristics of particles on electrorheological (ER) fluids, water free complex strontium titanate particles were synthesized through the sol gel technique and different mass fraction of the surfactant was doped in particles and dispersed in silicon oil. The test shows that surface characteristics of particles have great influence on the behavior of ER fluids. Surface tension, surface polarity and interfacial polarization are strongly related to the surface status of the dispersed particles. 展开更多
关键词 electrorheological (er) effect interfacial polarization SURFACTANT
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Electrorheological Damper and Its Application for Semi-Active Suspension System 被引量:1
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作者 赵霞 张永发 《Journal of Beijing Institute of Technology》 EI CAS 2007年第1期9-12,共4页
A semi-active control of vehicle suspension system with eleetrorheolngieal (ER) damper is presented. ER fluid characteristics are introduced based on the Bingham plasticity model first. Then ER damper working force ... A semi-active control of vehicle suspension system with eleetrorheolngieal (ER) damper is presented. ER fluid characteristics are introduced based on the Bingham plasticity model first. Then ER damper working force is given. Finally a quarter car model with ER damper is constructed. The skyhook control strategy is adopted to simulate the amplitude-frequency characteristics and the vibration of suspension system under random road excitation on the basis of ER damper characteristics. The response curves of the vertical acceleration, the suspension dynamic working space and the tyre dynamic loading are obtained. Simulation results show that the acceleration is reduced effectively and then the ride comfort is improved by the skyhook control law. 展开更多
关键词 dectrorheological(er fluid er damper suspension system semi-active control skyhook control
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Effect of Carrier Liquid on Electrorheological Performance and Stability of Oxalate Group-modified TiO2 Suspensions 被引量:1
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作者 马宁 董旭峰 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第4期854-861,共8页
By using oxalate group-modified TiO2 nanoparticles as the dispersing phase, different kinds of silicone oil with various viscosities and terminal groups(hydroxyl, hydrogen, and methyl) were used as the dispersing me... By using oxalate group-modified TiO2 nanoparticles as the dispersing phase, different kinds of silicone oil with various viscosities and terminal groups(hydroxyl, hydrogen, and methyl) were used as the dispersing media to prepare different electrorheological(ER) fluids. Their zero-field viscosity, yield stress under direct current electric fields, ER efficiency, shear stability, leakage current density, and sedimentation stability were tested to study the effect of carrier liquid on the properties of ER fluids. The results indicate that the zerofield viscosity, the yield stress, and the leakage current density increase with increasing viscosity of the silicone oils. The effects of the viscosity on the ER efficiency, the shear stability, and the sedimentation ratio depend on the competition between the viscous resistance and the aggregation of the particles. Among the three ER fluids prepared with silicone oil with different terminal groups, hydroxyl-terminated oil based sample has the highest zero-field viscosity, the highest field-induced yield stress and ER efficiency, the largest current density, and the best sedimentation stability. 展开更多
关键词 electrorheological fluids carrier liquid shear stability er efficiency sedimentation stability
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Effect of surfactant on the dielectric and electrorheological properties of zinc borate/silicone oil dispersions
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作者 Omer Yunus Gumus Halil Ibrahim Unal 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第12期1523-1530,共8页
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 mechanism.Results revealed that all vi... 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 mechanism.Results revealed that all virgin dispersions lacked polarization.Triton X-100,a non-ionic surfactant,was added to ZB/SO dispersions to enhance the polarizability of ZB particles.The 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 3.64.The 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. 展开更多
关键词 zinc BORATE electrorheological fluidS DIELECTRIC analysis SURFACTANT
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Electrorheological Fluids Based on Titania Particles Coated with Silica and Their Application in Smart Windows
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作者 MengqiangWU AiCHEN +1 位作者 ZhuoyaZHU YongquanHAN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第5期430-432,共3页
The electrorheological (ER) fluids are colloidal suspension of highly polarizable particles in a non-conducting solvent. Chains of submicron-sized particles formed along an applied DC electric field by the so-called e... The electrorheological (ER) fluids are colloidal suspension of highly polarizable particles in a non-conducting solvent. Chains of submicron-sized particles formed along an applied DC electric field by the so-called electrorheological effect. According to the obvious change of transmittance of the ER fluids in a DC electric field when the polarized particles arranged along the field, the model of smart window was proposed by sandwiching the ER fluids based on titania particles coated with silica between a pair of In-Sn oxide (ITO) coated glasses. The solar transmittance change as much as 48.0% was obtained with the wavelength of 500 nm at the maximum on applying and removing the electric field of 500 V/mm. 展开更多
关键词 electrorheological fluid TITANIA SILICA
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The Synthesis and Electrorheological Properties of BaTiO_3-coated PMMA Microspheres
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作者 彭随丽 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第1期85-87,共3页
Coated-PMMA microspheres consisting of poly (methyl methacrylate)(PMMA) core and barium titanate (BaTiO3) shell were synthesized by the modified sol-gel processing and then adopted as an electrorheological (ER... Coated-PMMA microspheres consisting of poly (methyl methacrylate)(PMMA) core and barium titanate (BaTiO3) shell were synthesized by the modified sol-gel processing and then adopted as an electrorheological (ER) materials. The structure and morphology of coated powders were chyfecterized by SEM and FT-IR; the shear stress of the suspensions of coated-PMMA particles and pure PMMA particles in silicone oil with a 20 vol% were investigated. The results show that the BaTiO3 coated PMMA microspheres based suspension in silicone oil exhibited typical ER behavior and stronger ER effects. 展开更多
关键词 surface coating PMMA BATIO3 electrorheological (er effects
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ELECTRORHEOLOGICAL PROPERTIES OF DIATOMITE/SILICONE OIL SUSPENSIONS UNDER DC FIELDS
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作者 Hasim Yilmaz 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第5期463-471,共9页
In this study, electrorheological (ER) behavior of suspensions prepared from 3.0 and 9.0 μm diatomite particulate, dispersed in insulating silicone oil (SO) medium was investigated. Sedimentation stabilities of s... In this study, electrorheological (ER) behavior of suspensions prepared from 3.0 and 9.0 μm diatomite particulate, dispersed in insulating silicone oil (SO) medium was investigated. Sedimentation stabilities of suspensions (c = 5 wt%) prepared using these diatomite powders were determined to be 32 days (d = 3 μm) and 24 days (d = 9 μm), respectively. ER activity of all the suspensions was observed to increase with increasing electric field strength, concentration and decreasing shear rate. Shear stress of diatomite suspensions increased linearly with increasing concentrations of the particles and with the applied electric field strength. Electric field viscosity of all the suspensions decreased sharply with increasing shear rate and particle size, showing a typical shear thinning non-Newtonian visco-elastic behavior. Effects of high temperature and polar promoter onto ER activity ofdiatomite/SO system were also investigated. 展开更多
关键词 electrorheological fluids Diatomite/silicone oil suspensions Shear stress.
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ELECTRORHEOLOGICAL PROPERTIES OF TALC POWDER/SILICONE OIL SUSPENSIONS UNDER DC FIELDS
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作者 Hasim Yilmaz Ummihan Yilmaz 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2007年第3期245-252,共8页
In this study, the electrorheological (ER) behavior of suspensions prepared from d50 = 2.4 lam talc powder, dispersed in insulating silicone oil (SO) medium was investigated. Sedimentation stabilities of suspensio... In this study, the electrorheological (ER) behavior of suspensions prepared from d50 = 2.4 lam talc powder, dispersed in insulating silicone oil (SO) medium was investigated. Sedimentation stabilities of suspensions (c = 5 wt%) prepared using these talc powder powders were determined to be 78 days. The ER activity of all the suspensions was observed to increase with increasing electric field strength, concentration and decreasing shear rate. The shear stress of talc powder suspensions increased linearly with increasing concentrations of the particles and with the applied electric field strength. Electric field viscosity of all the suspensions decreased sharply with increasing shear rate and showed a typical shear thinning non-Newtonian visco-elastic behavior. Effects of frequency on the ER activity of talc powder/SO system were also investigated. 展开更多
关键词 electrorheological fluids Talc powder/silicone oil suspensions Shear stress
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The electric field and frequency responses of giant electrorheological fluids
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作者 Hanqing Zhao Rong Shen Kunquan Lu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期561-565,共5页
The giant electrorheological (ER) fluid is based on the principle of a polar molecule dominated electrorheological (PM-ER) effect. The response of the shear stress for PM-ER fluid in alternate electric fields with... The giant electrorheological (ER) fluid is based on the principle of a polar molecule dominated electrorheological (PM-ER) effect. The response of the shear stress for PM-ER fluid in alternate electric fields with triangle/square wave forms for different frequencies has been studied. The results show that the shear stress cannot well follow the rapid change of electric field and the average shear stresses of PM-ER fluids decrease with the increasing frequency of the applied field due to the response decay of the shear stress on applied field. The behavior is quite different from that of traditional ER fluids. However, the average shear stress of PM-ER fluid in a square wave electric field of iE at low frequency can keep at high value. The obtained knowledge must be helpful for the design and operation of PM-ER fluids in the applications. 展开更多
关键词 electrorheological fluid frequency response
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Facile Synthesis of Polypyrrole/Titanate Core-Shell Nanorods and Their Electrorheological Characteristics
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作者 Jiexu Zhang Ying He Lijun Ji 《Materials Sciences and Applications》 2011年第2期111-115,共5页
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.... 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. 展开更多
关键词 POLYPYRROLE TITANATE NANORODS Conducting Composite electrorheological fluid Viscoelastic Properties
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Material Design and Experimental Analysis of a New Type of Semiconductor ER Fluids
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作者 朱石沙 魏宸官 《Journal of Beijing Institute of Technology》 EI CAS 2000年第2期155-159,共5页
To improve the electrorheological effect of electrorheological fluid (ERF), a new type of the electrosensitive particle material, polynaphthalene quinone was prepared, whose molecules contain blended atoms of nitrogen... To improve the electrorheological effect of electrorheological fluid (ERF), a new type of the electrosensitive particle material, polynaphthalene quinone was prepared, whose molecules contain blended atoms of nitrogen, oxygen, sulphur and big π bond conjugate system. In both DC and AC electric fields, the ERF material showed a distinct ER effect. Especially, in the alternating electric field, the shear stress of this material versus AC voltage has a better quadratic relation than that of the other materials. The experimental data showed that organic semiconductor polymers with big π bond conjugate system are a new type of electrosensitive particle materials which are worth well developing. 展开更多
关键词 electrorheological fluid(erF) alternating electric field regression analysis
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Polar molecule dominated electrorheological effect 被引量:9
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作者 陆坤权 沈容 +3 位作者 王学昭 孙刚 温维佳 刘寄星 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第11期2476-2480,共5页
The yield stress of our newly developed electrorheological (ER) fluids consisting of dielectric nano-particles suspended in silicone oil reaches hundreds of kPa, which is orders of magnitude higher than that of conv... The yield stress of our newly developed electrorheological (ER) fluids consisting of dielectric nano-particles suspended in silicone oil reaches hundreds of kPa, which is orders of magnitude higher than that of conventional ones. We found that the polar molecules adsorbed on the particles play a decisive role in such new ER fluids. To explain this polar molecule dominated ER (PM-ER) effect a model is proposed based on the interaction of polar molecule-charge between the particles, where the local electric field is significantly enhanced and results in the polar molecules aligning in the direction of the electric field. The model can well explain the giant ER effect and a near-linear dependence of the yield stress on the electric field. The main effective factors for achieving high-performance PM-ER fluids are discussed. The PM-ER fluids with the yield stress higher than one MPa can be expected. 展开更多
关键词 electrorheological fluid polar molecule POLARIZATION shear stress
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CAPTURE EFFECT OF ELECTRORHEOLOGICAL SUSPENSIONS IN FLOW FIELD 被引量:4
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作者 ZHU Shisha SUN Hongli +1 位作者 HUANG Yijian WANG Qixin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第2期97-100,共4页
According to the results of experiments and theoretical analysis, a phenomenon called "capture effect" is put forward, which could be used to describe the particles dynamic behavior of electrorheological (ER) susp... According to the results of experiments and theoretical analysis, a phenomenon called "capture effect" is put forward, which could be used to describe the particles dynamic behavior of electrorheological (ER) suspensions. Then a "structure-force" mathematical model is established to explain this effect based on electrostatic energy density equation. The analysis results show that the dynamic coupling process of ER suspensions under an external electric filed is the function not only of the electric intensity, but also of the dielectric properties and the structure form. 展开更多
关键词 electrorheological (er suspensions Dynamics Capture effect Dynamic coupling
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