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Journal of Polymer & Composites Original Research Open Access

Temperature-Dependent Viscoelastic Response of Magnetorheological Grease with Varying Particle Shapes

  1. Nur Adilah Adanan Department of Smart Engineering and Advanced Technology (SEAT), Faculty of Artificial Intelligence (FAI), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  2. Abdul Yasser Abd Fatah Department of Smart Engineering and Advanced Technology (SEAT), Faculty of Artificial Intelligence (FAI), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  3. Nur Azmah Nordin Department of Engineering Materials and Structures (EMAST) IKOHZA, Malaysia-Japan International Institute of Technology (MJIIT), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  4. Saiful Amri Mazlan Department of Engineering Materials and Structures (EMAST) IKOHZA, Malaysia-Japan International Institute of Technology (MJIIT), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  5. Siti Maisarah Ahmad Tarmizi Department of Engineering Materials and Structures (EMAST) IKOHZA, Malaysia-Japan International Institute of Technology (MJIIT), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  6. Rehnupreya Hentry Viension Department of Engineering Materials and Structures (EMAST) IKOHZA, Malaysia-Japan International Institute of Technology (MJIIT), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur
  7. Khairul Anwar Abdul Kadir Department of Engineering Materials and Structures (EMAST) IKOHZA, Malaysia-Japan International Institute of Technology (MJIIT), University Technology Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur

Abstract

This study examines the effect of temperatures on the magnetic and rheological properties of magnetorheological greases (MRGs) comprised of different particle shapes, under oscillatory shear mode test. Two samples were prepared with 70 wt.% flake-shaped electrolytic iron particles (EIP) and spherical carbonyl iron particles (CIP) which dispersed in 30 wt.% lithium-based grease, separately. Respective to magnetic properties test, the vibrating sample magnetometry (VSM) revealed that MRG-EIP exhibited 11.4% higher magnetic saturation (Ms), 94.4% higher remanent magnetization (Mr), and 89.1% greater coercivity (Hc) compared to MRG-CIP. These enhancements are attributed to the larger surface area and anisotropic shape of the EIP particles. Meanwhile, under strain sweep tests at 25°C, 45°C, and 65°C, at without (0 T) and with magnetic field of 0.59 T, the linear viscoelastic (LVE) region for both samples display different behaviour. At 25°C, the MRG-CIP possess a wider LVE region, with a limit at 0.0482% strain compared to the MRG-EIP which is limited to 0.0261% strain. Nevertheless, under 0.59 T, both samples exhibited the similar LVE limit, around 0.068% strain due to the magnetization effect experienced by both particles. Albeit being similar in LVE limit, the capability of both MRGs to store modulus (G’) at given strains are different, respective to the role of different particle shapes in the grease medium. Despite this, MRG-EIP exhibited a consistent increased in storage modulus at all temperatures, in contrast to the decrement in storage modulus observed in MRG-CIP sample. These results demonstrate that the flake-shaped of EIP improve the thermal and mechanical stability of MRG, offering the enhanced performance for magnetorheological devices that would be operating under variable temperature conditions.

Keywords

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