scholarly journals Effect of Magnetic Field and Aggregation on Electrical Characteristics of Magnetically Responsive Suspensions for Novel Hybrid Liquid Capacitor

2019 ◽  
Vol 5 (2) ◽  
pp. 38 ◽  
Author(s):  
Kunio Shimada
Keyword(s):  
Magnetic Field ◽  
Electrical Properties ◽  
Natural Rubber ◽  
Applied Voltage ◽  
Nonlinear Response ◽  
Magnetic Particles ◽  
Particle Aggregation ◽  
Electrical Characteristics ◽  
Rubber Latex ◽  
Wide Range

Magnetically responsive fluid based on polymers of natural rubber (NR-latex) involves a magnetic compound fluid (MCF) rubber liquid. For a wide range of engineering applications of suspensions or liquids with particles, their electrical characteristics of fluidic suspensions are investigated to obtain useful results that might be important in the study of devices, such as fluidic sensors and capacitors. The author of the present paper proposes that MCF rubber liquid can be produced by combining MCF and rubber latex. The influence of the aggregation of magnetic particles and rubber molecules on electrical characteristics under a magnetic field was investigated by measuring electrical properties under an applied voltage. The electrical characteristics change with a linear or a nonlinear response, based on conditions of particle aggregation. The capacity of the electric charge also changes with the conditions of particle aggregation. These results show that MCF rubber liquid is a novel hybrid capacitor.

Sensing Behavior of Magnetorheological Elastomers

2009 ◽  
Vol 131 (9) ◽  
Author(s):  
Xiaojie Wang ◽  
Faramarz Gordaninejad ◽  
Mert Calgar ◽  
Yanming Liu ◽  
Joko Sutrisno ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Properties ◽  
Magnetic Particles ◽  
External Stimulus ◽  
Magnetorheological Elastomer ◽  
Polymer Medium ◽  
Mechanical Loads ◽  
Magnetorheological Elastomers ◽  
Impedance Response ◽  
Ferromagnetic Particles

A magnetorheological elastomer (MRE) is comprised of ferromagnetic particles aligned in a polymer medium by exposure to a magnetic field. The structures of the magnetic particles within elastomers are very sensitive to the external stimulus of either mechanical force or magnetic field, which result in multiresponse behaviors in a MRE. In this study, the sensing properties of MREs are investigated through experimentally characterizing the electrical properties of MRE materials and their interfaces with external stimulus (magnetic field or stress/strain). A phenomenological model is proposed to understand the impedance response of MREs under mechanical loads and magnetic fields. Results show that MRE samples exhibit significant changes in measured values of impedance and resistance in response to compressive deformation, as well as the applied magnetic field.

Electrical Properties of Magneto-Rheological Elastomers

2008 ◽  
Author(s):  
Xiaojie Wang ◽  
Faramarz Gordaninejad ◽  
Mert Calgar ◽  
Yanming Liu ◽  
Joko Sutrisno ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Properties ◽  
Magnetic Particles ◽  
External Stimulus ◽  
Magnetorheological Elastomer ◽  
Polymer Medium ◽  
Impedance Response ◽  
Properties Of Materials ◽  
Magneto Rheological ◽  
Ferromagnetic Particles

A magnetorheological elastomer (MRE) is comprised of ferromagnetic particles aligned in a polymer medium by exposure to a magnetic field. The structures of the magnetic particles within elastomers are very sensitive to the external stimulus of either mechanical force or magnetic field, which result in multi-response behaviors in MRE. In this study, sensing properties of MREs through experimentally characterizing the electrical properties of materials and theirs interfaces with external stimulus (magnetic field or stress/strain) are investigated. A phenomenological model is proposed to model the impedance response of MREs. Results show that MRE samples exhibit significant changes in measured values of impedance and resistance in response to compressive deformation, as well as applied magnetic field.

MAGNETORHEOLOGICAL ELASTOMER COMPOSITES BASED ON INDUSTRIAL WASTE NICKEL ZINC FERRITE AND NATURAL RUBBER

2019 ◽  
Vol 92 (4) ◽  
pp. 749-762 ◽  
Author(s):  
Nordalila Moksin ◽  
Hanafi Ismail ◽  
Muhammad Khalil Abdullah ◽  
Raa Khimi Shuib
Keyword(s):  
Magnetic Field ◽  
Natural Rubber ◽  
Tensile Properties ◽  
Zinc Ferrite ◽  
Magnetic Particles ◽  
Mechanical Performance ◽  
Dynamic Mechanical ◽  
Nickel Zinc ◽  
The Matrix ◽  
Tan Δ

ABSTRACT Magnetorheological elastomers (MREs) based on waste nickel zinc ferrite and natural rubber were prepared. The amount of waste nickel zinc ferrite was varied at five levels (20, 40, 60, 80, and 100 phr) to assess the optimum amount of waste nickel zinc ferrite content for highest dynamic mechanical and tensile performance. Curing characteristics of the MREs were determined by moving disk rheometer (MDR 2000), and thermal properties were evaluated by thermogravimetric analysis (TGA). Tan δ was measured through parallel and plate rheometer over a frequency range of 0.1–100 Hz and a strain amplitude range of 0.1–6%. Tensile properties were measured with a universal tensile tester. The results revealed that tan δ, tensile properties, and thermal stability of the MREs increased with increase of waste nickel zinc ferrite contents. Anisotropic MREs, which had chain-like columnar structures of magnetic particles in the matrix as a consequence of an applied magnetic field during curing, were found to produce higher dynamic mechanical performance compared with isotropic MREs cured in the absence of a magnetic field.

Natural rubber latex/potato starch nanocrystal nanocomposites: Correlation morphology/electrical properties

2011 ◽  
Vol 65 (23-24) ◽  
pp. 3615-3617 ◽  
Author(s):  
Emilie Bouthegourd ◽  
K.R. Rajisha ◽  
Nandhakumar Kalarical ◽  
Jean Marc Saiter ◽  
Sabu Thomas
Keyword(s):  
Electrical Properties ◽  
Natural Rubber ◽  
Potato Starch ◽  
Natural Rubber Latex ◽  
Rubber Latex

scholarly journals INFLUENCE OF A PULSED MAGNETIC FIELD ON THE ELECTRICAL PROPERTIES OF NANOPOWDER SYSTEM BASED ON ZIRCONIA

2017 ◽  
Vol 23 (3) ◽  
pp. 208
Author(s):  
Artem V Shylo ◽  
Aleksandr S Doroshkevich ◽  
Tetyana E Konstantinova
Keyword(s):  
Magnetic Field ◽  
Electrical Properties ◽  
Charge Carriers ◽  
Pulsed Magnetic Field ◽  
Electrical Characteristics ◽  
Free Charge

<p class="AMSmaintext">A technique for studying of electrical characteristics of sealed nanopowder compacts from a powder based on ZrO<sub>2</sub> was proposed. In particular, it has been established that the action of weak pulsed magnetic field leads to redistribution of free charge carriers between the volume and the surface of nanoparticles.</p>

Magnetic-Field-Assisted Projection Stereolithography for Three-Dimensional Printing of Smart Structures

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Lu Lu ◽  
Ping Guo ◽  
Yayue Pan
Keyword(s):  
Magnetic Field ◽  
Polymer Composites ◽  
Magnetic Particles ◽  
Autonomous Systems ◽  
Three Dimensional ◽  
Distribution Patterns ◽  
Smart Polymer ◽  
Liquid Polymer ◽  
Wide Range ◽  
Projection Stereolithography

In this paper, an additive manufacturing (AM) process, magnetic field-assisted projection stereolithography (M-PSL), is developed for 3D printing of three-dimensional (3D) smart polymer composites. The 3D-printed magnetic field-responsive smart polymer composite creates a wide range of motions, opening up possibilities for various new applications, like sensing and actuation in soft robotics, biomedical devices, and autonomous systems. In the proposed M-PSL process, a certain amount of nano- or microsized ferromagnetic particles is deposited in liquid polymer by using a programmable microdeposition nozzle. An external magnetic field is applied to direct the magnetic particles to the desired position and to form the desired orientation and patterns. After that, a digital mask image is used to cure particles in photopolymer with desired distribution patterns. The magnetic-field-assisted projection stereolithography (M-PSL) manufacturing process planning, testbed, and materials are discussed. Three test cases, an impeller, a two-wheel roller, and a flexible film, were performed to verify and validate the feasibility and effectiveness of the proposed process. They were successfully fabricated and remote controls of the printed samples were demonstrated, showing the capability of printed smart polymer composites on performing desired functions.

Fabrication of Novel Polyhydroxybutyrate-co-Hydroxyvalerate (PHBV) Mixed with Natural Rubber Latex

2015 ◽  
Vol 659 ◽  
pp. 404-408 ◽  
Author(s):  
Karndarthip Kuntanoo ◽  
Sarunya Promkotra ◽  
Pakawadee Kaewkannetra
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Testing Machine ◽  
Natural Rubber Latex ◽  
Melting Behavior ◽  
Melting Transition ◽  
Rubber Latex ◽  
Scanning Calorimetry ◽  
Wide Range ◽  
Mixed Films

Polyhydroxybutyrate-co-hydroxyvalerate (PHBV) is mixed with natural rubber latex to make better mechanical properties of PHBV. The various ratios between PHBV and natural rubber latex are examined to improve their mechanical properties. The PHBV are solid, easily broken, while natural rubber is excessive elastic materials. Concentrations of the employed PHBV solution are 1, 2, and 3 (%w/v). The mixtures of this solution to natural rubber latex are fabricated the biofilms in three different ratios, 4:6, 5:5, and 6:4, respectively. The films are characterized by electron microscope, universal testing machine, and differential scanning calorimetry (DSC). The electron micrographs of the mixed films and unmixed PHBV yield the lowest void distributions in 3%w/v PHBV. For mechanical properties, the averaged elastic moduli of 1, 2, and 3 (%w/v PHBV) mixed films are 773, 955 and 1,008 kPa, respectively. Their tensile strengths increase with increasing the PHBV concentrations. A similar trend is also found in elastic modulus. The crystallization and melting behavior of pure PHBV and the mixed films are examined by DSC. Melting transition temperatures of pure PHBV exhibit two melting peaks at 154°C and 173°C. In addition, the melting peaks of the mixed films remain in the range of 152-156°C and 168-171°C, respectively. According to their morphology, void distributions reduce twice, compared to the unmixed PHBV. Mechanical properties and thermal analysis indicate that the mixed PHBV can be improved their properties with more resilient and wide range temperature than usual.

Additive Manufacturing of Magnetic Field-Responsive Smart Polymer Composites

2016 ◽  
Author(s):  
Yayue Pan ◽  
Lu Lu
Keyword(s):  
Magnetic Field ◽  
Additive Manufacturing ◽  
Polymer Composites ◽  
Manufacturing Process ◽  
Magnetic Particles ◽  
Autonomous Systems ◽  
Smart Polymer ◽  
Manufacturing Process Planning ◽  
Wide Range ◽  
Projection Stereolithography

In this paper, an additive manufacturing process, named Magnetic Field-assisted Projection Stereolithography (M-PSL), is presented for applications such as fabricating magnetic field-responsive smart polymer composites. The 3D printed magnetic field-responsive smart polymer composite creates a wide range of motions, opening up possibilities for various new applications, like sensing and actuation in soft robotics, biomedical devices, and autonomous systems. In M-PSL process, a certain amount of nano- or micro-scale ferromagnetic particles is deposited into resin vat with a programmable microdeposition nozzle. Then a magnetic field is applied to direct the magnetic particles to the desired area. After that, digital mask images are used to cure particles in photopolymer with certain patterns. Important issues like magnetic particle movements, curing mechanisms, and manufacturing process planning are discussed. Two test cases, an impeller and a two-wheel roller, have been successfully fabricated for remote control under external magnetic field, showing the capability of printed smart polymer composites on performing desired functions.

scholarly journals NUMERICAL STUDY OF THE ROSENSWEIG INSTABILITY IN A MAGNETIC FLUID SUBJECT TO DIFFUSION OF MAGNETIC PARTICLES

2010 ◽  
Vol 15 (2) ◽  
pp. 223-233 ◽  
Author(s):  
Olga Lavrova ◽  
Viktor Polevikov ◽  
Lutz Tobiska
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Numerical Study ◽  
Fluid Layer ◽  
Classical Problem ◽  
Parametric Representation ◽  
Field Configuration ◽  
Wide Range

The present study is devoted to the classical problem on stability of a magnetic fluid layer under the influence of gravity and a uniform magnetic field. A periodical peak‐shaped stable structure is formed on the fluid surface when the applied magnetic field exceeds a critical value. The mathematical model describes a single peak in the pattern assuming axial symmetry of the peak shape. The field configuration in the whole space, the magnetic particle concentration inside the fluid and the free surface structure are unknown quantities in this model. The unknown free surface is treated explicitly, using a parametric representation with respect to the arc length. The nonlinear problem is discretized by means of a finite element method for the Maxwell's equations and a finite‐difference method for the free surface equations. Numerical modelling allows to get over‐critical equilibrium free surface shapes in a wide range of applied field intensities. Our numerical results show a significant influence of the particle diffusion on the overcritical shapes.

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