Bica Ioan, Iacobescu Gabriela-Eugenia
Advanced Environmental Research Institute, West University of Timisoara, Bd. V. Parvan, Nr. 4, 300223 Timisoara, Romania.
Department of Physics, University of Craiova, Str. A. I. Cuza, Nr. 13, 200585 Craiova, Romania.
Polymers (Basel). 2022 May 18;14(10):2062. doi: 10.3390/polym14102062.
In this study, magnetizable polyurethane sponges (MSs) were obtained from commercial absorbent polyurethane sponges (PSs) doped with carbonyl iron microparticles (CIPs). Based on MSs, we manufactured cylindrical capacitors (CCs). The CCs were subjected to both a magnetic field and an alternating electric field, with a frequency of f=1 kHz. Using an RLC bridge, we measured the series electric capacitance, Cs, and the tangent of the loss angle, Ds. From the functions Cs=Cs(δ)CCs and Ds=Ds(δ)CCs, we extracted the components of the complex dielectric permittivity. It was found that the CIPs embedded in the MS matrix aggregated, leading to magneto-dielectric effects such as the enhancement of the complex dielectric permittivity components when applying the magnetic field as a principal effect and the enhancement of the electric capacitance and time constant of the capacitors as a secondary effect. The obtained results represent landmarks in the realization of low-cost magnetic field sensors, deformation and mechanical stress transducers in the robotics industry, etc.
在本研究中，可磁化聚氨酯海绵（MSs）由掺杂羰基铁微粒（CIPs）的商用吸收性聚氨酯海绵（PSs）制得。基于MSs，我们制造了圆柱形电容器（CCs）。CCs受到频率为f = 1 kHz的磁场和交变电场作用。使用RLC电桥，我们测量了串联电容Cs和损耗角正切Ds。从函数Cs = Cs(δ)CCs和Ds = Ds(δ)CCs中，我们提取了复介电常数的分量。结果发现，嵌入MS基体中的CIPs发生聚集，导致磁电效应，如施加磁场时主要表现为复介电常数分量增强，次要表现为电容器电容和时间常数增大。所得结果为实现低成本磁场传感器、机器人行业中的变形和机械应力传感器等奠定了基础。
