Article
Materials Science, Ceramics
Thomas J. Moran, Keigo Suzuki, Tadasu Hosokura, Alexander Khaetskii, Bryan D. Huey
Summary: By using atomic force microscopy to characterize discharging dynamics, researchers have found that microstructures in insulating materials can significantly affect discharging rates. This provides insight into optimizing microstructures for improved capacitor performance.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Green & Sustainable Science & Technology
Yihan Fu, Yu Tian, Mengze Li, Jiahe Ma, Shuran Li, Weidong Zhu, Keping Yan, Yinglin Ke
Summary: This study proposes a method to recycle and disperse short-chopped carbon fibers (SCFs) using pure electrostatic forces and dielectric polarization. By investigating the charging and orientation mechanisms, as well as the dispersive characteristics of SCFs, it is found that large-scale SCFs can be uniformly dispersed and sufficiently charged in the electrostatic field, and their direction can be controlled. This method has significant implications for pollution-free, low-cost, and efficient recycling of recycled fibers.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Xiaoping Chen, Yina Liu, Yi Sun, Tianshi Zhao, Chun Zhao, Tawfik A. Khattab, Eng Gee Lim, Xuhui Sun, Zhen Wen
Summary: In this study, a MXene/TiO2 hybrid film was prepared as an intermediate layer in a TENG to regulate and store charges, thereby improving the output performance of the TENG.
Article
Chemistry, Physical
Guan-Yu Liu, Wei-Feng Sun, Qing-Quan Lei
Summary: By employing a novel semiconductor electrode to inject characteristic charge carriers into polymer dielectric, this study delves into the injection and capture behaviors of electrons and holes. Through TSC experiments and first-principles calculations, the charge characteristics injected by the novel electrode and the corresponding dielectric behavior are analyzed. This research helps distinguish between hole and electron traps in polymer dielectrics.
Article
Biochemical Research Methods
Doyel Pandey, Pranab Kumar Mondal, Somchai Wongwises
Summary: We propose a novel technique for efficient solute mixing at a microfluidic scale based on the induced charge electrokinetic (ICEK) phenomenon. By employing polarizable dielectric objects of different sizes and shapes instead of perfectly conducting polarizable objects, we demonstrate that vortices developed in the flow pathway adjacent to the polarizable dielectric blocks contribute to efficient mixing. Our work focuses on the influences of the physical properties and the arrangements of the polarizable dielectric blocks on the underlying mixing phenomena.
Article
Materials Science, Composites
Abhishek Sasmal, Aniket Patra, P. Sujatha Devi, Shrabanee Sen
Summary: The effect of Ag decoration on ZnSnO3 filler surface on the dielectric and mechanical energy harvesting performance of PVDF based composite films was investigated in this study. It was found that Ag decoration significantly enhanced the dielectric permittivity and improved the mechanical energy harvesting performance of the composite films.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Ting Li, Hui-Jie Yan, Jia-Qi Li, J. Schulze, Si-Qi Yu, Jian Song, Quan-Zhi Zhang
Summary: This study experimentally investigates the charge accumulation and decay in SDBDs driven by a combination of sine AC voltage waveform and nanosecond positive voltage pulse. It is found that the accumulation of positive charge promotes the discharge in the negative half cycle, while inhibiting the development of new positive charge filaments. The decay of a single positive charge filament is a result of neutralization by negative charges from either the migration of negative surface charge or the drift of free electrons.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Junwei Liu, Qiaoli Liu, Pinwen Zhu
Summary: Magnesium and Niobium co-doped BaTiO3 ceramics were prepared, and their crystal structures, microstructures, valence states, and dielectric properties were studied. The study found that the lattice parameter of the ceramics increased with doping content, and thermal activation relaxation processes were observed. The analysis of electric modulus revealed that high-frequency relaxation was associated with the electrical properties of grain boundary, and the permittivity plateaus were related to the inhomogeneous structures of grain and grain boundary.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Rishi Pal, Sneh Lata Goyal, Ishpal Rawal, Vivek Gupta
Summary: The dielectric properties of in-situ polymerized polyaniline-multiwalled carbon nanotubes (PANI/MWCNTs) nanocomposite sample were analyzed as a function of temperature and applied frequency. The introduction of MWCNTs into the PANI matrix during polymerization and the reduction via chemical treatment with ammonia resulted in a lower conducting dielectric state. XRD pattern showed the semi-crystalline nature of the prepared sample. The dielectric constant increased with temperature and decreased with applied frequency, and the enhanced dielectric properties were attributed to the mobility of electric dipoles and reduced dc electrical conductivity due to the reduction of PANI/MWCNTs nanocomposite.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Construction & Building Technology
Bei Zhang, Yaowei Ni, Yanhui Zhong
Summary: Investigations into the dielectric properties of concrete form the basis for concrete quality testing and condition monitoring of internal structures when using ground penetrating radar (GPR). A new dielectric model was deduced from circuit theory to calculate the dielectric permittivities of concrete, showing higher accuracy compared to other classical models.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Thermodynamics
Hengsong Ji, Tianbei Luo, Liming Dai, Zhixia He, Qian Wang
Summary: In this paper, an electrochemical-thermal coupling model was developed and validated through battery disassembly and charge test experiments. The variation patterns of polarization and heat generation of lithium iron phosphate batteries at different charge rates were numerically investigated. The results showed that high-current charging exacerbates internal polarization and abnormal heat generation, and the changes in charge voltage profiles are strongly linked to total cell polarization. The study also found that the polarization in the electrodes dominates the cell polarization, and the large temperature difference at high charge currents is attributed to the difference in heat generation rates between the positive tab and the cell core. The findings are important for developing appropriate charging protection strategies and improving battery operation and life.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Chun Han, Qun Zhou, Jiawei Hu, Cai Liang, Xiaoping Chen, Jiliang Ma
Summary: Particle-particle collisions have a significant impact on triboelectric charging in particle-laden flows, yet the mechanisms behind the charging patterns remain poorly understood. Experimental results demonstrate that the polarity of transferred charge varies with material type, and the influence of initial charges on charge transfer was compared across different materials. Through electrostatic analysis, it was revealed that dielectric polarization effects significantly alter the potential difference, leading to discrepancies in charging tendencies of various materials.
JOURNAL OF ELECTROSTATICS
(2021)
Article
Materials Science, Multidisciplinary
L. Xu, Z. Hou, H. Kang
Summary: The proposed nondestructive testing method based on electro-acoustic technique is able to accurately detect internal defects in dielectric materials, with minimal error. The shape and time characteristics of the stress wave can reflect the characteristics of the defects.
EXPERIMENTAL MECHANICS
(2022)
Article
Engineering, Electrical & Electronic
Yinghong Zuo, Jianguo Wang, Shengli Niu, Yuan Wei
Summary: The study shows that the charging electric field in dielectric material caused by high-energy electrons in an artificial radiation belt is related to the injection current density, and the time needed to reach saturated charging and the intensity of the electric field influence the discharge risk.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Thomas S. Nowack, Yash D. D. Shah, James P. Grant, Ivonne Escorcia Carranza, Mitchell G. Kenney, Daniele Faccio, Edward Wasige, David R. S. Cumming
Summary: English Summary: This article presents the design and fabrication of an anisotropic metasurface that can simplify instrument construction by incorporating multiple beam-forming functions in a single layer. The metasurface generates a probe beam consisting of an orthogonally polarized pair of collinear Bessel beams, creating a well-defined on-axis change of polarization. The setup allows for 3-D beam profiling and sensing experiments at 2.52 THz, and was used for refractive index and diattenuation measurements in a proof-of-principle application. This technology is expected to have future applications in NDT and polarimetric imaging of polymer composites and 3-D profilometry of reflective surfaces.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)