Zaini Nursyafiqah, Mohamad Norzilawati, Mazlan Saiful Amri, Abdul Aziz Siti Aishah, Choi Seung-Bok, Hapipi Norhiwani Mohd, Nordin Nur Azmah, Nazmi Nurhazimah, Ubaidillah Ubaidillah
Engineering Materials and Structures (eMast) iKohza, Malaysian-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia.
Faculty of Engineering, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu 88400, Malaysia.
Materials (Basel). 2021 Dec 6;14(23):7484. doi: 10.3390/ma14237484.
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.
在许多应用中，常见的传感器是刚性装置的形式，能够根据外部刺激做出反应。然而，磁流变弹性体（MRP）可以提供一种新型的传感能力，因为它形状灵活、质地柔软且对外部磁场有响应。在本研究中，将石墨（Gr）颗粒作为添加剂引入到MRP中，以研究其电学性质在MRP中的优势，例如电导率，这在潜在传感器中是绝对必需的。作为实现这一目标的第一步，制备了含有羰基铁颗粒（CIPs）和0至10 wt.%不同含量Gr的MRP样品，并通过实验评估了它们与磁场相关的电学性质。在使用环境扫描电子显微镜（ESEM）对Gr-MRP的形态进行表征之后，通过振动样品磁强计（VSM）评估了MRP和Gr-MRP的磁性。然后在各种施加的磁通密度下测试Gr-MRP样品的电阻率，结果表明，Gr-MRP的电阻率随着Gr含量增加至10 wt.%而降低。此外，使用试验台测试电导率，结果表明，随着Gr添加剂含量增加至10 wt.%，电导率增加。发现在400 mT的磁通密度下，10 wt.% Gr-MRP的电导率最高，比6 wt.%的Gr-MRP高178.06%。观察到随着Gr的添加，电导率特性随着磁通密度的增加而改善，这可能有助于这些材料作为传感检测装置的潜在用途。
