Efficient Electrorheological Technology for Materials, Energy, and Mechanical Engineering: From Mechanisms to Applications

et al. 2023

Materials

Electrorheological (ER) polishing is a novel polishing technology having flexible and tunable characteristics. At present, ER polishing uses ER particles to drive abrasive particles to polish the material surface. Under the action of high-speed centrifugation, the abrasive particles are easily separated from ER particles due to their significantly different ER effect, and this can easily cause the degradation of polishing ability. In this work, alumina-doped titanium dioxide ER polishing particles were developed via a sol-gel method. As a classical abrasive, alumina has higher hardness and can improve the ER effect of titanium dioxide by doping. Thus, alumina-doped titanium dioxide particles simultaneously possess high ER effect and high hardness. No phase separation appears in the polishing process and the result shows that alumina-doped titanium dioxide has a good polishing efficiency for materials with Mohs hardness of 3 and below.

Section: Introductionmentioning

confidence: 99%

Enhanced Electrorheological Polishing Efficiency of Alumina-Doped Titanium Dioxide Particles

Sun

et al. 2023

Materials

“…However, in this process, the abrasive is easy to be thrown out, causing abrasive loss and reducing polishing efficiency . Electrorheological polishing (ERP) is an electric field-assisted polishing technique, which can use electrorheological (ER) effect to overcome the centrifugal force of abrasive rotation at high speed . ERP has advantages of high polishing efficiency, small amorphous surface polishing, and easy to combine with other machining methods to improve the machining effect. − …”

Section: Introductionmentioning

confidence: 99%

Hollow Poly(ionic liquid)/α-Al₂O₃ Composite Particles Prepared by Microwave-Assisted Pickering Emulsion Polymerization and Their Electrorheological Polishing Property

Sun

ACS Appl. Polym. Mater.

et al. 2023

In this study, we reported a kind of hollow poly(ionic liquid)/α-Al2O3 composite particles prepared by rapid microwave-assisted Pickering emulsion polymerization using the commercial high hardness α-Al2O3 abrasive (Mohs hardness = 9) as a particulate surfactant. The structure and morphology were characterized by different techniques. The as-prepared composite particles were then used as the dispersed phase of the electrorheological polishing fluid. Our results demonstrated that the hollow poly(ionic liquid) core provided dispersion stability and electrorheological effect, while the α-Al2O3 shell provided high hardness and polishing capability. Under an electric voltage of 3 kV, the polishing fluid of the hollow poly(ionic liquid)/α-Al2O3 composite particles could improve the surface quality of the stainless-steel workpiece with Mohs hardness of 5 from Ra ∼270 to ∼90 nm. This polishing performance was extraordinary and far better when compared to that of the polishing fluid consisting of a simple mixture of poly(ionic liquid) particles and α-Al2O3 particles. During polishing, the voltage, rotation speed, working gap, and polishing time were demonstrated to have an effect on polishing efficiency. This study paves the way to develop electrorheological polishing fluids with dispersion stability and high polishing efficiency by combining hollow polymer particles and high hardness of abrasives.

“…Titanium dioxide (TiO 2 ) nanoparticles are an attractive functional material that has wide applications as photocatalysts, electrode material for lithium-ion batteries, , self-cleaning coating, and electroresponsive electrorheological (ER) material. , When used as an ER material, the dielectric TiO 2 nanoparticles are suspended by an insulating liquid. Under the action of an electric field, the suspended nanoparticles are polarized and assembled into particulate networks between the electrodes, which makes the suspension perform as a solid rather than a fluid.…”

Section: Introductionmentioning

confidence: 99%

TiO₂ Nanoparticles Dual-Modified with Ionic Liquid and Acetic Acid for Use as Electrorheological Materials to Achieve Ultrahigh and Stable Electroresponsive Performances

Xiao

Liang

et al. 2022

ACS Appl. Nano Mater.

TiO2 nanoparticles modified by ionic liquid (IL), which are called inorganic ionogels, have shown improved electroresponsive electrorheological (ER) characteristics due to the contribution of IL to the polarizability and conductivity of the nanoparticles. However, the IL on the particle surface readily generates a large current density under high-strength electric fields, limiting the further application of IL-containing electroresponsive materials. In this study, 1, 3-disulfonic acid imidazolium chloride ([Dsim]Cl) ionic liquid and acetic acid (AA) dual-modified TiO2 nanoparticles (TiO2-[Dsim]Cl-AA) were fabricated to solve this problem without significantly reducing the ER properties of the nanoparticles. The morphologies and structures of the TiO2-[Dsim]Cl-AA nanoparticles modified with different amounts of AA were synthesized and investigated. The rheological analysis indicated that the TiO2 ionogel nanoparticles modified by an appropriate amount of AA can effectively reduce the leakage current density of the ER fluid. With a relatively low particle volume fraction of 25%, the ER fluid showed ultrahigh yield stress up to 128 kPa and low zero-field viscosity of 7 Pa·s. In addition, the ER fluid also showed a stable ER effect in a broad temperature range of 5–85 °C and a slow sedimentation rate with time. The IL and AA dual-modified TiO2 nanoparticles with an ultrahigh yield stress, broad working temperature range, and high antisettling stability will be excellent ER candidates for practical application.