Article
Materials Science, Multidisciplinary
Anushi Sharma, Rajeev Kumar, Ashish Gupta, Pinki Rani Agrawal, Neeraj Dwivedi, D. P. Mondal, A. K. Srivastava, Sanjay R. Dhakate
Summary: The article introduces a novel lightweight carbon foam decorated with zinc oxide nanofibers for high-performance electromagnetic interference shielding. The material shows excellent shielding properties and is suitable for aerospace and next-generation smart devices.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Composites
Kuan-Yu Chen, Shivam Gupta, Nyan-Hwa Tai
Summary: In this study, low-density, compressible and porous composites were fabricated by coating PU sponge with rGO and Fe2O3, achieving high EMI shielding effectiveness through enhanced absorption and dielectric loss, as well as utilizing the porous structure for multiple reflections and scattering of EM waves. By selectively stacking rGO coated and rGO/Fe2O3 coated sponges, the absorption of electromagnetic waves was further improved up to 97.3% by serving as reflection and absorption layers.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Ali Shayesteh Zeraati, Abilash Mende Anjaneyalu, Shital Patangrao Pawar, Ahmed Abouelmagd, Uttandaraman Sundararaj
Summary: Hybrid polymer nanocomposites based on PVDF matrix with different secondary nanofillers were fabricated and studied for their electrical conductivity and EMI shielding effectiveness. The hybrid nanocomposites containing CNT/AgNW showed superior performance compared to individual fillers, with an EMI shielding effectiveness as high as 27 dB for a shield with only 1.1 mm thickness. Various EMI shielding mechanisms, including negative permittivity, were studied in detail.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Loan F. Calheiros Souto, Bluma G. Soares
Summary: In this study, polyaniline doped with dodecylbenzene sulfonic acid (PAni.DBSA) was synthesized using in situ inverted emulsion polymerization method and the composites with ethylene vinyl acetate (EVA) copolymer were explored as potential microwave absorbing materials. The findings reveal that the microwave absorption performance of EVA@PAni composites is influenced by the PAni content, with the optimal attenuation achieved by the composite with 33 vol % PAni, displaying a minimum reflection loss of -39 dB (99.99% attenuation) at 16.65 GHz.
Article
Materials Science, Composites
Houbao Liu, Renli Fu, Xinqing Su, Binyong Wu, He Wang, Yue Xu, Xuhai Liu
Summary: This study presents a layer-by-layer spin coating process to prepare multilayer films with ordered alternate structures; the combination of MXene and PDMS provides effective EMI shielding, while BN and PDMS offer efficient heat dissipation. The EMI SE of the multilayer films increases with the number of layers, but an increase in layers results in decreased thermal conductivity and electrical insulation performance.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Prajna P. Mohapatra, Pamu Dobbidi
Summary: Carbon black reinforced lithium ferrite composites (LFO/CB) were synthesized to enhance the electromagnetic interference (EMI) shielding effectiveness (SE). The composites showed high total SE and absorption efficiency at specific CB concentrations, and the properties of the materials can be tailored by varying the CB content. These findings suggest that LFO/CB composites have potential applications in the defense and telecommunication sectors.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Composites
Yongqiang Guo, Hua Qiu, Kunpeng Ruan, Shuangshuang Wang, Yali Zhang, Junwei Gu
Summary: This work focuses on the development of CF@Fe2O3/(BN/SR) composites with excellent thermal conductivity, electromagnetic interference (EMI) shielding performance, and electrical insulation properties. The sandwich structure of CF@Fe2O3/(BN/SR) composites contributes to effective EMI shielding by absorption-reflection-reabsorption of electromagnetic waves, while BN/SR and CF@Fe2O3 layers enhance thermal conductivity and electrical insulation, respectively. The composites show higher performance in terms of thermal conductivity, EMI shielding effectiveness, volume resistance, and breakdown strength compared to conventional CF/(BN/SR) composites. The CF@Fe2O3/(BN/SR) composites also exhibit better cooling effect than commercial silicon grease in computer testing platforms, indicating promising applications in electronics.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Review
Chemistry, Physical
Xi Shen, Jang-Kyo Kim
Summary: This review summarizes the recent progress in developing porous composites and structures for electromagnetic interference (EMI) shielding using graphene and MXene nanosheets. The relationships between material properties, microstructures, and EMI shielding performance are explored, and different technological approaches to constructing porous structures are compared. The review also highlights the multifunctional applications of porous composites and their unique compositions and microstructures.
Article
Engineering, Environmental
Junpyo Hong, Jisung Kwon, Dohyun Im, Jeonggil Ko, Chae Yun Nam, Hyeong Gyu Yang, Sun Ho Shin, Soon Man Hong, Seung Sang Hwang, Ho Gyu Yoon, Albert S. Lee
Summary: Multiple conductive fillers were incorporated in a polypropylene matrix through melt processing. The properties of the composites, including electrical conductivity, thermal conductivity, and EMI shielding were examined based on different filler compositions. The study also investigated the correlation between electrical conductivity and EMI shielding properties using a theoretical model.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Beomsu Shin, Subhadip Mondal, Minkyu Lee, Suhyun Kim, Yang-Il Huh, Changwoon Nah
Summary: This study explores the effects of different lengths of CNTs on the performance of TPU composites, with long CNTs offering higher EMI shielding efficiency and short CNTs enhancing thermal conductivity. Long CNTs help form unique interconnected conductive networks within the TPU matrix, improving the overall performance of the composites.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Environmental Sciences
Syed Shujaat Karim, Zahid Murtaza, Sarah Farrukh, Malik Adeel Umer, Syed Sarim Ali, Mohammad Younas, Muhammad Mubashir, Sidra Saqib, Muhammad Ayoub, Awais Bokhari, Angela Paul Peter, Kuan Shiong Khoo, Sami Ullah, Pau Loke Show
Summary: This review article discusses the importance of polymer-based composites in EMI shielding, covering their advantages, shielding mechanism, and challenges; enhancing EMI shielding effectiveness by using different fillers in polymer and nanocomposites; proposing future research directions to further advance EMI shielding materials for industrial applications.
ENVIRONMENTAL RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Sol Lee, Nam Khanh Nguyen, Minje Kim, Pangun Park, Junghyo Nah
Summary: This study presents a new method to achieve lightweight electromagnetic interference (EMI) shielding materials with high EMI shielding effectiveness (SE) through absorption-dominant mechanisms using organic polymer nanofibers (NFs). By adjusting the concentration of iron chloride and conducting vapor phase polymerization (VPP) on polyvinylidene fluoride (PVDF) NFs, NF layers with varying conductivity and a conductivity gradient structure are created, resulting in enhanced absorptivity of electromagnetic waves. The gradient structure of the NF layers also promotes interfacial polarization, contributing to the effective absorption of electromagnetic waves. As a result, a high absolute EMI SE with low reflectivity was achieved without compromising the lightweight and flexible properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Meenu Chahar, Samiksha Dabas, O. P. Thakur
Summary: This study synthesized nano-composites of Ni0.5Zn0.5Fe2O4/MWCNTs and investigated their properties using various analytical techniques. The synthesized materials exhibited crystalline phase formation and a hexagonal flake-like structure. The electromagnetic interference performance of the materials was tested using a Vector Network Analyzer, and the CM nano-composite showed excellent shielding effectiveness.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Xianhong Zheng, Jinhao Tang, Lvzhu Cheng, Haiwei Yang, Lihua Zou, Changlong Li
Summary: This study develops a layer-by-layer assembling strategy to construct Fe3O4/MXene composite fabrics with low resistance, super-hydrophobicity, self-cleaning, and excellent EMI shielding performance. The EMI shielding mechanism of HFMs can be tuned from absorption to reflection by adjusting the loaded active materials. Furthermore, HFMs also exhibit good electrothermal performance and can be used as a wearable heater for personal thermal management.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Chemistry, Multidisciplinary
Jixian Wang, Lei Li, Shan Jiang, David J. Young, Zhi-Gang Ren, Hong-Xi Li
Summary: This study presents a series of SH-group-functionalized covalent organic frameworks (COFs) as prospective photoactive materials for photocatalytic hydrogen evolution. The use of nickel thiolate as a cocatalyst significantly enhances the hydrogen evolution rate.
Article
Chemistry, Inorganic & Nuclear
Pin-Pin Ma, Zhi-Min Hao, Pan Wang, Wen-Hua Zhang, David J. Young
Summary: trans-[Ni(pdm)(2)](2+) (pdm = 2-pyridinemethanol) is a reliable synthon for constructing isoreticular metal-organic frameworks (MOFs) of linear dicarboxylates. Three one-dimensional MOFs with identical connectivity were synthesized using this synthon, and they exhibited different crystal packing patterns in the solid state.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Review
Biology
Xiaojiang Xu, Timothy P. Rioux, Michael P. Castellani
Summary: This paper reviews three-dimensional models for human thermoregulation. It introduces the development of thermoregulatory models and key principles for mathematical description. Different representations of 3D human bodies are discussed, and recent models have used medical image datasets to develop geometrically correct human models. Finite element method is commonly used for solving governing equations and obtaining numerical solutions. These realistic geometry models provide high anatomical realism and can predict whole-body thermo-regulatory responses at a high resolution.
JOURNAL OF THERMAL BIOLOGY
(2023)
Article
Biology
Michael P. Castellani, Timothy P. Rioux, John W. Castellani, Adam W. Potter, Sean R. Notley, Xiaojiang Xu
Summary: This study developed a female finite element thermoregulatory model (FETM) by constructing an anatomically correct female body model from medical image datasets. The model considers heat balance within the body and heat exchange at the skin surface, as well as the regulation mechanisms of vasodilation, vasoconstriction, sweating, and shivering. The model was validated with measured physiological data and predicted core temperature and mean skin temperatures accurately.
JOURNAL OF THERMAL BIOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Wei Yang, Shengnan Hu, Yuwei Wang, Sisi Yan, Xiang-Qian Cao, Hong-Xi Li, David James Young, Zhi-Gang Ren
Summary: A new Ag/Cu bimetallic cluster exhibited strong phosphorescent emission at 644 nm and red-shifted emission at 678 nm upon removal of coordinated EtOH molecules. The structure and emission of the cluster were restored on exposure to EtOH vapor. The cluster also showed vapor-chromic phosphorescent response to common organic solvent vapors and a reusable PMMA film was developed as a visible sensor for MeCN.
Article
Physics, Applied
Peng Yin, Peitao Xie, Qingyang Tang, Qifa He, Shuang Wei, Runhua Fan, Zhicheng Shi
Summary: By introducing C/SiO2@TiO2 triphase nanoparticles into the P(VDF-HFP) matrix, the permittivity and polarization of the dielectric material are improved. The bilayer composite with merely 0.75 wt. % nanoparticles achieves high breakdown strength, energy density, and efficiency. The incorporation of hybrid-core satellite nanofillers in the linear/nonlinear bilayer structure offers an effective strategy for designing high-performance dielectric energy storage materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Qing Li, Bo-Wei Xu, Yi-Ming Zou, Ru-Jie Niu, Jin-Xiang Chen, Wen-Hua Zhang, David James. Young
Summary: In this study, nanoscale two-dimensional Fe-II- and Co-II-based metal-organic frameworks (NMOFs) were shown to have an anticancer effect in the tumor microenvironment. These NMOFs can catalyze the production of hydroxyl radicals (center dot OH) and O-2 in the presence of H2O2, and consume O-2 to produce singlet oxygen (O-1(2)) through photodynamic therapy. Both center dot OH and O-1(2) are reactive oxygen species (ROS) that inhibit cancer cell proliferation.
Article
Biochemistry & Molecular Biology
Kiyoshi Fujisawa, Yui Kobayashi, Mitsuki Okano, Ryota Iwabuchi, Shiori Kondo, David James Young
Summary: Coordination polymers of transition metal ions, such as silver(I), are important in coordination chemistry. Silver(I) coordination polymers are often insoluble in common solvents, making it difficult to analyze them in solution. However, by using a tetramethyl-substituted bipyrazole ligand, we have synthesized more soluble silver(I) complexes with coordinated ions CF3CO2- and CF3SO3-. We determined the structures of these complexes and studied their solution behavior using various spectroscopic techniques.
Article
Chemistry, Organic
Da-Liang Zhu, Haoyu Wen, Qi Wu, Jie Li, David J. Young, Yanqing Wang, Hong-Xi Li
Summary: 3-Thiocyanated indoles were synthesized by a mild and efficient light-induced cross-coupling reaction between indoles and NH4SCN without the need for a catalyst. This method, which utilizes oxygen as the terminal oxidant and exhibits good functional group tolerance, was performed on a gram scale.
Article
Dentistry, Oral Surgery & Medicine
Rui Cheng, Xiaojiang Xu, Shurong Yang, Zhongqian Mi, Yong Zhao, Chong Wang, Xuexue Shi, Jinhua Gao, Feiyan Yu, Xiuyun Ren
Summary: This study investigated the effects of chronic periodontitis on diabetes-associated atherosclerosis and found that chronic periodontitis may lead to enhanced systemic inflammation, disorganized lipid metabolism, and decreased adiponectin level, resulting in an imbalance of inflammatory factors. Therefore, predicting the progression of diabetes-associated atherosclerosis based on anti-inflammatory/pro-inflammatory variation is more meaningful.
Article
Chemistry, Physical
Yalei Hao, Zhong Leng, Changyou Yu, Peitao Xie, Limei Zhou, Yongsheng Li, Gemeng Liang, Xingyun Li, Chunzhao Liu
Summary: In this study, hollow bowl-like carbon (HBC) materials were controllably constructed by the hard template method, and their tunable pore structure, surface properties, and shell thicknesses contribute to excellent performance. The HBC with a shell thickness of 3 nm exhibited the best wave-absorbing performance at a 4% absorber content. Its minimum reflection loss value was -50 dB at a thin thickness of 2.26 mm, and its effective absorption bandwidth, at a fixed thin thickness of 2 mm, could reach as wide as 7.04 GHz (10.96-18 GHz). Thin shells are essential for achieving lightweight and the bowl-like shape prevents the formation of percolative networks. with a low mass fraction of absorber content, the HBC materials can obtain moderate dielectric constant and loss, leading to good impedance matching and sufficient attenuation capacity. This work provides an effective and sustainable approach to utilize porous carbon materials for developing lightweight and high-performance wave-absorbing materials.
Article
Chemistry, Inorganic & Nuclear
Kiyoshi Fujisawa, Aoba Yamada, Moeka Koyama, David James Young
Summary: Tridentate, planar nitrogen containing ligands based on pyridine and pyrazoles were synthesized and their solid-state structures were analyzed. Copper(II) chlorido and trifluoromethanesulfonato complexes were formed with these ligands and their coordination geometries were studied. The UV-Vis spectra of the complexes showed pi-pi* transition band red-shift and d-d transition bands at similar energy, indicating structural changes in the solution-state. EPR spectroscopy supported the findings.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Physical
Chuming Wang, Mang Niu, Ting Wang, Peitao Xie, Zehua Chen, Chunzhao Liu, Yuan Liu
Summary: Researchers prepared porous carbon nanosheets with abundant Sn delta+ sites (Sn-PCNS) through controllable template-directed method and carbonization process. The atomically dispersed Sn delta+ is stabilized mainly by O/N moieties in the carbon framework, which enhances the electron transfer and Li+-/Na+-diffusion kinetics, benefiting the Li+-/Na+-storage capabilities.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yun-Peng Qu, Hai-Kun Wu, Pei-Tao Xie, Ni Zeng, Yan-Li Chen, Xiu Gong, Jing-Liang Yang, Qiong Peng, Yu Xie, Xiao-Si Qi
Summary: In this study, carbon nanotube-carbon black/CaCu3Ti4O12 (CNT-CB/CCTO) ternary metacomposites were fabricated. These metacomposites exhibit negative permittivity and high thermal conductivity, showing potential for applications in microwave attenuation devices and novel electronic devices.
Article
Chemistry, Organic
Da-Liang Zhu, Jie Li, David James Young, Yanqing Wang, Hong-Xi Li
Summary: This paper presents a mild strategy for aminating aryl halides with anilines using dual photoredox and nickel catalysis. Thioxanthen-9-one, an inexpensive and readily available compound, greatly enhanced this cross-coupling reaction, yielding a diverse range of diarylamines in good yields (41-93%) at room temperature. The reaction could be performed under compact fluorescent lamp light or sunlight and was tolerant of various functional groups. It was successfully applied to the synthesis of natural products and drug molecules, even at a gram-scale. The mechanism involves several steps including oxidative addition, transmetalation, energy transfer, and reductive elimination.
ORGANIC CHEMISTRY FRONTIERS
(2023)
