Abdul Aziz Siti Aishah, Mazlan Saiful Amri, Ubaidillah U, Shabdin Muhammad Kashfi, Yunus Nurul Azhani, Nordin Nur Azmah, Choi Seung-Bok, Rosnan Rizuan Mohd
Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia.
Advanced Vehicle System (AVS) Research Group, Malaysia - Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia (UTM), Kuala Lumpur 54100, Malaysia.
Materials (Basel). 2019 Oct 28;12(21):3531. doi: 10.3390/ma12213531.
Carbon-based particles, such as graphite and graphene, have been widely used as a filler in magnetorheological elastomer (MRE) fabrication in order to obtain electrical properties of the material. However, these kinds of fillers normally require a very high concentration of particles to enhance the conductivity property. Therefore, in this study, the nanosized Ni-Mg cobalt ferrite is introduced as a filler to soften MRE and, at the same time, improve magnetic, rheological, and conductivity properties. Three types of MRE samples without and with different compositions of Mg, namely CoNiMgFeO (A1) and CoNiMgFeO (A2), are fabricated. The characterization related to the micrograph, magnetic, and rheological properties of the MRE samples are analyzed using scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and the rheometer. Meanwhile, the effect of the nanosized Ni-Mg cobalt ferrites on the electrical resistance property is investigated and compared with the different Mg compositions. It is shown that the storage modulus of the MRE sample with the nanosized Ni-Mg cobalt ferrites is 43% higher than that of the MRE sample without the nanomaterials. In addition, it is demonstrated that MREs with the nanosized Ni-Mg cobalt ferrites exhibit relatively low electrical resistance at the on-state as compared to the off-state condition, because MRE with a higher Mg composition shows lower electrical resistance when higher current flow occurs through the materials. This salient property of the proposed MRE can be effectively and potentially used as an actuator to control the viscoelastic property of the magnetic field or sensors to measure the strain of the flexible structures by the electrical resistance signal.
碳基颗粒，如石墨和石墨烯，已被广泛用作磁流变弹性体（MRE）制造中的填料，以获得材料的电学性能。然而，这类填料通常需要非常高的颗粒浓度来提高导电性能。因此，在本研究中，引入了纳米尺寸的镍镁钴铁氧体作为填料，以软化磁流变弹性体，同时改善其磁性能、流变性能和导电性能。制备了三种不含镁和含有不同镁成分的磁流变弹性体样品，即CoNiMgFeO（A1）和CoNiMgFeO（A2）。使用扫描电子显微镜（SEM）、振动样品磁强计（VSM）和流变仪对磁流变弹性体样品的微观结构、磁性能和流变性能进行了表征分析。同时，研究了纳米尺寸的镍镁钴铁氧体对电阻性能的影响，并与不同的镁成分进行了比较。结果表明，含有纳米尺寸镍镁钴铁氧体的磁流变弹性体样品的储能模量比不含纳米材料的磁流变弹性体样品高43%。此外，结果表明，与关态条件相比，含有纳米尺寸镍镁钴铁氧体的磁流变弹性体在开态时表现出相对较低的电阻，因为当较高电流通过材料时，镁成分较高的磁流变弹性体显示出较低的电阻。所提出的磁流变弹性体的这一显著特性可以有效地且潜在地用作控制磁场粘弹性特性的致动器，或用作通过电阻信号测量柔性结构应变的传感器。
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