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Nanofabrication, Characterization and Application of Magnetic Functional Materials

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Prof. Dr. Gennadij Vladimirovich Stepanov

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State Scientific Research Institute of Chemistry and Technology of Organoelement Compounds (GNIIChTEOS), 111123 Moscow, Russia
Interests: magnetorheological; magnetoactive elastomer; ferrogel; hybrid elastomer; magnetic gel; damping effect

Special Issue Information

Dear Colleagues,

This Special Issue of "Fabrication, Characterization and Application of Magnetic Functional Materials" will look at advances in the area of synthesis, fabrication, characterization, and the application of materials with magnetic field-controllable properties. Their principal feature is their ability to vary their parameters under the influence of external magnetic fields. Being typical representatives of the family of such substances, magnetic elastomers have a varied set of descriptive names, including ‘magnetorheological’, ‘magnetoactive’, ‘magnetocontrollable materials’, ‘magnetic polymers’, ‘magnetic gels’, etc. This field of research has attracted intensive attention over the last two decades and remains relatively novel. A variation of ‘smart materials’, magnetocontrollable elastomers, may find application as sensing units or as actuators in different machines or robotic assemblies. The possession of strong magnetorheological properties conditions their utilization as part of controllable damping devices. At the same time, such materials are known to demonstrate more than 10 various ‘smart’ effects when influenced by magnetic fields, the investigation of which is the primary goal. Papers contributing to production methods, research methods, new characteristics depending on the magnetic field, obtaining high parameters of known properties, and various applications are welcome. The mathematical description of the observed effects remains an important aspect of the understanding of this type of material.

Prof. Gennadij Vladimirovich Stepanov
Guest Editor

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Research

15 pages, 5281 KiB

Open AccessArticle

The Effect of Graphite Additives on Magnetization, Resistivity and Electrical Conductivity of Magnetorheological Plastomer

by Nursyafiqah Zaini, Norzilawati Mohamad, Saiful Amri Mazlan, Siti Aishah Abdul Aziz, Seung-Bok Choi, Norhiwani Mohd Hapipi, Nur Azmah Nordin, Nurhazimah Nazmi and Ubaidillah Ubaidillah

Materials 2021, 14(23), 7484; https://doi.org/10.3390/ma14237484 - 6 Dec 2021

Cited by 6 | Viewed by 2673

Abstract

Common sensors in many applications are in the form of rigid devices that can react according to external stimuli. However, a magnetorheological plastomer (MRP) can offer a new type of sensing capability, as it is flexible in shape, soft, and responsive to an external magnetic field. In this study, graphite (Gr) particles are introduced into an MRP as an additive, to investigate the advantages of its electrical properties in MRPs, such as conductivity, which is absolutely required in a potential sensor. As a first step to achieve this, MRP samples containing carbonyl iron particles (CIPs) and various amounts of of Gr, from 0 to 10 wt.%, are prepared, and their magnetic-field-dependent electrical properties are experimentally evaluated. After the morphological aspect of Gr–MRP is characterized using environmental scanning electron microscopy (ESEM), the magnetic properties of MRP and Gr–MRP are evaluated via a vibrating sample magnetometer (VSM). The resistivities of the Gr–MRP samples are then tested under various applied magnetic flux densities, showing that the resistivity of Gr–MRP decreases with increasing of Gr content up to 10 wt.%. In addition, the electrical conductivity is tested using a test rig, showing that the conductivity increases as the amount of Gr additive increases, up to 10 wt.%. The conductivity of 10 wt.% Gr–MRP is found to be highest, at 178.06% higher than the Gr–MRP with 6 wt.%, for a magnetic flux density of 400 mT. It is observed that with the addition of Gr, the conductivity properties are improved with increases in the magnetic flux density, which could contribute to the potential usefulness of these materials as sensing detection devices. Full article

(This article belongs to the Special Issue Nanofabrication, Characterization and Application of Magnetic Functional Materials)

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16 pages, 4306 KiB

Open AccessArticle

Rheological Performance of Magnetorheological Grease with Embedded Graphite Additives

by Nur Alyaa Mohd Nasir, Nurhazimah Nazmi, Norzilawati Mohamad, Ubaidillah Ubaidillah, Nur Azmah Nordin, Saiful Amri Mazlan, Siti Aishah Abdul Aziz, Muhammad Kashfi Shabdin and Nurul Azhani Yunus

Materials 2021, 14(17), 5091; https://doi.org/10.3390/ma14175091 - 6 Sep 2021

Cited by 22 | Viewed by 2992

Abstract

The use of highly viscous grease as a medium in magnetorheological grease (MRG) provides the benefit of avoiding sedimentation from occurring. However, it limits the expansion of yield stress in the on-state condition, thus reducing the application performance during operation. Therefore, in this study, the improvement in the rheological properties of MRG was investigated through the introduction of graphite as an additive. MRG with 10 wt % graphite (GMRG) was fabricated, and its properties were compared to a reference MRG sample. The microstructure of GMRG was characterized using an environmental scanning electron microscope (ESEM). The rheological properties of both samples, including apparent viscosity, yield stress, and viscoelasticity, were examined using a shear rheometer in rotational and oscillatory modes. The results demonstrated a slight increase in the apparent viscosity in GMRG and a significant improvement in yield stress by 38.8% at 3 A with growth about 32.7% higher compared to MRG from 0 to 3 A. An expansion of the linear viscoelastic region (LVE) from 0.01% to 0.1% was observed for the GMRG, credited to the domination of the elastic properties on the sample. These obtained results were confirmed based on ESEM, which described the contribution of graphite to constructing a more stable chain structure in the GMRG. In conclusion, the findings highlight the influence of the addition of graphite on improving the rheological properties of MRG. Hence, the addition of graphite in MRG shows the potential to be applied in many applications in the near future. Full article

(This article belongs to the Special Issue Nanofabrication, Characterization and Application of Magnetic Functional Materials)

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