Article
Engineering, Electrical & Electronic
Nyathani Maramu, D. Ravinder, T. Anil Babu, M. Srinivas, B. Ravinder Reddy, G. Sriramulu, Katlakuntla Sadhana, N. V. Krishna Prasad
Summary: A series of silver-doped strontium hexaferrite were synthesized by the Co-precipitation method, and their crystal structure, morphology, and microwave absorption properties were studied. The results showed that the lattice parameters increased and grain size decreased with the increase of Ag doping, leading to improved microwave absorption properties in X-band frequencies. The study confirmed the nature of microwave absorption for Ag-doped strontium hexaferrite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Manufacturing
Kai Sun, Wenxin Duan, Yanhua Lei, Zongxiang Wang, Jiahong Tian, Pengtao Yang, Qifa He, Min Chen, Haikun Wu, Zheng Zhang, Runhua Fan
Summary: Flexible composites with weakly negative permittivity were prepared by using polyvinylidene fluoride (PVDF) as the flexible matrix and modified multi-walled carbon nanotubes (MWCNTs) as functional fillers. The composites exhibited low frequency dispersion behavior with a negative permittivity conforming to Drude model when the content of MWCNTs exceeded 13wt%. This study provides guidance for the development and application of flexible metamaterials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Electrical & Electronic
Zhong Leng, Haikun Wu, Xinxue Tang, Yang Li, Yinger Xin, Peitao Xie, Guixian Li, Kelan Yan, Chunzhao Liu
Summary: This study explores the conduction mechanism of conductor-insulator composite materials by adjusting the content and distribution of carbon nanotubes (CNTs) and achieves effective regulation of negative dielectric constant. CNTs/epoxy composites exhibit near-zero dielectric and negative dielectric constant properties at specific volume fractions. The findings provide a method for simple and efficient control of negative permittivity and facilitate its application in electronic components and electromagnetic shielding.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
M. Z. Ahsan, M. M. Kamal, S. S. Rakhi, S. N. Tanha, G. I. Hasan
Summary: This communication reports the electric modulus of manganese doped cobalt ferrite nanoparticles. The characteristic frequency of the dispersion of the imaginary portion of the electric modulus does not follow the rising trend in Mn content due to the heterogeneity in microstructure. The Nyquist plot of the complex electric modulus identifies the dominant charge carriers in the conduction phase based on the Mn content.
RESULTS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Zhipeng Wang, Kuan Yin, Yuliang Zhang, Kai Sun, Longjie Xie, Mengyang Cong, Shengjia Cao, Yanhua Lei, Xiaofeng Li, Runhua Fan
Summary: In this paper, Ti3C2Tx/carbonized wood composites with weakly negative permittivity were successfully prepared. The composites demonstrated the formation of three-dimensional conductive networks and a change in permittivity values from positive to negative, indicating a unique phenomenon and potential applications.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Chemistry, Physical
Xinyang Wang, Bo Wang, Shicheng Wei, Yi Liang, Yujiang Wang, Linwei Li, Zhen Liu
Summary: The magnetic-dielectric composite with a metal-organic framework (MOF) structure has shown great potential for effective microwave absorption. By utilizing the sol-gel method, h-MWCNT/doped barium ferrite composites were prepared with a porous MOF structure that had abundant microscopic cavity structure and an adequate conductive network. The optimized composition of h-MWCNTs achieved a minimum reflection loss of -56.47 dB at 4.8 GHz and a maximum wave-absorbing bandwidth of 6.20 GHz, covering the Ku band.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Zihao Chen, Dawei Mu, Tianhao Liu, Zilong He, Yi Zhang, Huaming Yang, Jing Ouyang
Summary: A three-phase PANI/BaFe12O19@Hal heterostructure was designed and fabricated in this study as an efficient lightweight electromagnetic wave absorbing material. The material exhibited the best microwave absorption performance when the weight ratio of PANI was 40%, with a frequency bandwidth of 9.60 GHz and a minimum absorption peak of 14.77 dB at 11.92 GHz. Introducing halloysite improved the microwave absorption performance and enriched the absorbing mechanism of the composite materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Prajna P. Mohapatra, Pamu Dobbidi
Summary: Erbium substituted lithium ferrite/carbon black composites were synthesized and their morphological, structural, complex permeability, permittivity, and EMI shielding effectiveness were investigated. The substitution of Er resulted in an enhancement in lattice constant, saturation magnetization, and coercivity. 3d-4f coupling was promoted due to the insertion of Er, leading to variation in magnetic, dielectric, and conduction mechanisms. The shielding effectiveness was significantly improved, with absorption playing a more important role than reflection. The obtained results indicate that LE6FO/CB is a promising candidate for EMI shielding applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hyo Seon Jang, Qi Lu, Hyoung Jin Choi
Summary: In this study, hard-magnetic barium ferrite nanoparticles were utilized as additives in a carbonyl iron microparticle-based magnetorheological fluid. The addition of BF nanoparticles improved the dispersion stability and MR performance of the fluid, showing higher dynamic and elastic yield stresses as the magnetic field strength increased compared to the fluid without the BF additive. The morphology and magnetic properties of the particles were characterized, and the MR characteristics were examined using a rotation rheometer.
FRONTIERS IN MATERIALS
(2021)
Article
Materials Science, Ceramics
Jun Li, Yang Hong, San He, Weike Li, Han Bai, Yuanhua Xia, Guangai Sun, Zhongxiang Zhou
Summary: The synthesis of titanium-doped barium ferrite ceramics using a modified sol-gel method is investigated. The crystal structure and magnetic structure are determined using neutron diffraction, and the ceramics show high quality single phase and sheet microstructure. The Ti4+ doping leads to double resonance peaks in the imaginary part of magnetic conductivity, allowing for wideband modulation microwave absorption. These ceramics exhibit excellent frequency modulation ability in the microwave absorption field.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Chemistry, Physical
A. Plyushch, D. Lewin, A. Sokal, R. Grigalaitis, V. V. Shvartsman, J. Macutkevic, S. Salamon, H. Wende, K. N. Lapko, P. P. Kuzhir, D. C. Lupascu, J. Banys
Summary: Bulk BaTiO3-xCoFe2O4 (x = 0.1 - 0.6) magnetoelectric composites with high purity and excellent dielectric and magnetic properties were prepared using the phosphate bonded ceramics approach. The dielectric properties were influenced by composition-dependent relaxations and anomalies at different frequencies, while the magnetic properties were limited by the size of CoFe2O4 particles. The measured direct magnetoelectric coupling coefficient was higher than that of conventionally sintered ceramics and comparable to that of core-shell structures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Sindhu Singh, Prabhakar Singh, Om Parkash, Devendra Kumar
Summary: Polycrystalline samples of (Ba1-xLax)(Ti0.85CoxSn0.15)O-3 with La and Co co-doping were synthesized and characterized by X-ray diffraction. The co-doping showed significant effects on the crystal structure and properties of the material, leading to high permittivity, low dielectric loss, and temperature stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Composites
Wenfeng Xu, Zhicheng Shi, Shengbiao Sun, Liang Sun, Huanlei Wang, Kai Sun, Runhua Fan
Summary: This paper investigates the electrical properties of nanocomposites using conductive polypyrrole nanowires as fillers and P(VDF-HFP) as matrix, revealing two different percolation behaviors with increasing PPy content. High permittivity and tunable negative permittivity behavior were achieved, providing a new strategy towards high-k materials and random metamaterials.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
ZongXiang Wang, Kai Sun, YunPeng Qu, JinYuan Qin, Jiahong Tian, Yaping Li, XiaoFeng Li, Xuai Wang, RunHua Fan
Summary: In this study, titanium nitride/copper calcium titanate (TiN/CCTO) composites were prepared by low-temperature sintering. It was found that when the TiN content exceeded 50 wt%, the composites exhibited negative permittivity, which was attributed to plasma oscillation phenomenon. The AC conduction behavior transitioned from hopping to metal-like with increasing TiN content, and equivalent circuit analysis showed a relationship between positive reactance values and negative permittivity.
Article
Materials Science, Ceramics
Kai Sun, Pengtao Yang, Qifa He, Jiahong Tian, Wenxin Duan, Xinfeng Wu, Yunpeng Qu, Hailiang Du
Summary: In this study, ternary multiwalled carbon nanotubes/titanium nitride/copper calcium titanate composites were prepared using a facile sintering method in an inert atmosphere to achieve weakly negative permittivity. The negative permittivity was observed due to the synergy between TiN and MWCNT, exhibiting Lorentz-like behavior at low frequencies and Drude-like behavior at high frequencies. Investigation revealed a close relationship between permittivity and reactance, with the sintering atmosphere also impacting the negative permittivity behavior.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jian Jia, Yanmin Wang, Meiling Xu, Mei-li Qi, Yanling Wu, Gang Zhao
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2020)
Article
Construction & Building Technology
Zhimin Liu, Yanmin Wang, Jian Jia, Huadong Sun, Huiru Wang, Hong Qiao
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
Huiru Wang, Yanmin Wang, Xian Li, Min Chen, Yanling Wu, Cuicui Sun, Xiaoning Wang
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2020)
Article
Construction & Building Technology
Xian Li, Yan-Min Wang, Yan-Ling Wu, Hui-Ru Wang, Min Chen, Hua-Dong Sun, Liang Fan
Summary: Incorporating nano-scaled graphene in asphalt can effectively improve its anti-ageing property, high-temperature stability, and temperature sensitivity. Nano-scaled graphene, serving as asphaltene with high surface energy, is dispersed uniformly and prevents the diffusion of oxygen into the asphalt. The study explores the modification and anti-ageing mechanism of graphene-modified asphalt through microscopic characterization and FTIR analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Multidisciplinary Sciences
Shengkun Yao, Mei-li Qi, Liang Qi, Yongling Ding, Min Chen, Yanmin Wang
Summary: This study successfully synthesized flowerlike carbonated HA microspheres via a one-step hydrothermal route, demonstrating that the particle size of the microspheres can be controlled by adjusting the EDTA concentration. The mechanism of morphological transition of the microspheres under hydrothermal conditions with different EDTA concentrations was proposed.
ROYAL SOCIETY OPEN SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Fengce Mei, Shengkun Yao, Wei-li Xu, Yanling Wu, Yanmin Wang, Mei-li Qi
Summary: The study found that the presence of Glu during hydrothermal synthesis promotes the growth of hydroxyapatite crystals, transforming them from flower-like aggregates to porous microspheres. Additionally, the doping of silver ions helps to maintain the roundness of hydroxyapatite microspheres.
MICRO & NANO LETTERS
(2021)
Article
Chemistry, Physical
Xian Li, Yanmin Wang, Yanling Wu, Huiru Wang, Qingliang Wang, Xingxing Zhu, Xiaocun Liu, Huadong Sun, Liang Fan
Summary: Graphene modifier can promote the formation of asphaltic bee structures, leading to an increase in the number and a decrease in the volume of these structures, while also significantly improving the anti-aging performance of asphalt.
Article
Materials Science, Multidisciplinary
Mengchen Li, Zhizhong Zhao, Haizhi Li, Yanmin Wang, Qingliang Wang, Xingxing Zhu, Liang Fan
Summary: The study investigates the photocatalytic degradation efficiency of nanoscaled TiO2 in indoor and outdoor conditions through field tests and laboratory experiments, resulting in formulation of equations to analyze factors influencing degradation efficiency. The research shows that environmental factors only account for 25% of the degradation efficiency in actual engineering practices compared to the 63% in laboratory tests.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Mei-li Qi, Shengkun Yao, Wen Wang, Liang Qi, Yanmin Wang, Haijun Zhang
Summary: This study prepared HA nanostructures with tailored length regulated by different fatty acids through a solvothermal route. The growth of HA crystals was regulated and the morphology of HA nanomaterials was transformed from long nanowires to short nanowires and then nanorods. This provides a simple and environmentally friendly way to obtain HA nanomaterials with tailored length for biomedical applications.
MICRO & NANO LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Min Chen, Kai Sun, Xuai Wang, Yanmin Wang
Summary: The study demonstrated that metal composites can achieve negative permittivity and exhibit inductive characteristics under certain compositions. This provides support for the realization of tunable low-frequency negative permittivity in metal composites.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Hui-Ru Wang, Yan-Min Wang, Mei-Li Qi, Qing-Liang Wang, Xian Li, Xing-Xing Zhu, Xiao-Qing Yu, Zhi-Min Liu
Summary: Regulating asphalt pavement temperature through the use of diatomite-supported PEG composite as filler can achieve a self-regulating temperature variation of around 7.3 degrees Celsius. Despite potential impacts on road performance, including mechanical properties and stability, the effects are minimal and generally meet specification requirements.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Xian Li, Yan-Min Wang, Shu-Jun Wu, Hui-Ru Wang, Xiao-Cun Liu, Hua-Dong Sun, Liang Fan
Summary: Asphalt binder aging can lead to various pavement diseases, and modification can improve its anti-aging properties. In this study, Montmorillonite modified asphalt binders were tested under different aging conditions, and it was found that 4% modification significantly improved the anti-aging properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Cuicui Sun, Yingjie Jiang, Yanmin Wang, Xiao-Cun Liu, Yanling Wu, Yongling Ding, Guiling Zhang
Summary: The electronic and transport properties of fluorographane (C2HF) nanoribbons, including bare and hydrogen-passivated C2HF nanoribbons, are extensively investigated using first-principles calculations. Edge states are present in all bare C2HF nanoribbons and spin splitting phenomenon only appears in the zigzag direction, mainly due to dehydrogenation operation leading to sp(2) hybridization at the edge. Hydrogen-passivated C2HF nanoribbons are semiconductors with wide band gaps while the band gap of bare C2HF nanoribbons is significantly reduced. Additionally, phase transition can be induced by changes in magnetic coupling at nanoribbon edges, and optimal conductivity is observed in bare C2HF nanoribbons along the zigzag direction.
Article
Chemistry, Multidisciplinary
Yanling Wu, Yanmin Wang, Zuoxu Xiao, Miantuo Li, Yongling Ding, Mei-li Qi
Summary: This study focuses on the development and application of catalysts for the oxygen reduction reaction (ORR), with a particular emphasis on the potential use of nitrogen-doped carbon materials in ORR. Through experiments and analysis, an efficient and low-cost Co/Co3O4@N-doped carbon catalyst suitable for ORR was identified.
