Article
Chemistry, Multidisciplinary
Zhi Sun, Na Cheng, Feng Chen, Xin-li Lou, Xia-yan Tong, Jian-wei Zhao, Hong-wen Zhang
Summary: Epoxy resin conductive adhesives with high electrical conductivity have been prepared by adding micron-scale silver-coated copper (Cu@Ag) particles. The properties of the Cu@Ag particles, such as corrosion resistance and oxidation resistance, were found to be improved under high-temperature conditions.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Na Cheng, Zhi Sun, Xiaohui Yu, Qianzhen Yu, Jianwei Zhao
Summary: In order to improve the conductivity and shear performance of epoxy resin-based adhesives, silver was deposited on the surface of 5 μm flake copper particles as a conductive filler using a simple, environmentally friendly, and stable method. The core-shell metal fillers were prepared by utilizing the autocatalytic properties of Cu without adding any reducing agent during the reaction. The structure of flake plated Cu@Ag particles was characterized, and it was found that a layer of compact and crystalline silver was deposited on the surface of copper particles, which positively affected the performance of silver-plated copper particles. The flake plated Cu@Ag particle-epoxy composite ECAs prepared by this method have excellent properties and significant application value for advanced electronic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Polymer Science
Hyun-Seok Choi, Jeong-Hyun Park, Jong-Hee Lee
Summary: This study achieved a highly thermal conductivity of 9.83 Wm(-1)K(-1) by using highly sophisticated blending and dispersion techniques with spherical aluminum nitride fillers. It suggests that these adhesives can be potential candidates for advanced semiconductor packaging processes.
Article
Materials Science, Composites
Yanhong Ji, Peng Miao, Ruonan Zhang, Quan Li, Yifan Zha, Fengying Dai, Xi Du, Benqiao He, Shaoyun Fu
Summary: In this study, micro-sized flower-like silver particles (MFSPs) with long and thin petals are prepared by a novel chemical reduction method. The morphology and size of MFSPs are controlled by adjusting the reactant mass ratio and concentration. The as-prepared MFSP/epoxy composite adhesive exhibits low percolation threshold, high conductivity, and high adhesion strength at a very low silver content.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Yong Wei, Min Wu, Shijie Sun, Jin Liu, Qilin Yue, Yuquan Chen
Summary: In this study, electrically detachable ionic conductive epoxy adhesives (IEPs) with ultra-high initial bonding strength were prepared by introducing poly(ethylene glycol) (PEG) and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([BMIM]TFSI) into the epoxy. It was found that the bonding strength could be adjusted by the molecular weight of PEG, and an initial bonding strength of more than 20 MPa could be achieved. The IEPs were able to be completely and automatically detached by applying 60 V DC voltage within 1 min, and the electrically detaching mechanisms of IEPs were studied and linked to the electrodecomposition mechanism of [BMIM]TFSI.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Composites
Shuo Wang, Rui Cai, Hongqian Xue, Tianqing Liu, Sensen Han, Zhiqiang Zhou, Zonghao Hu, Qingshi Meng
Summary: The addition of one-dimensional CNTs and two-dimensional BN nanosheets into the epoxy matrix leads to significant improvements in thermal conductivity and mechanical properties, forming a three-dimensional network structure.
POLYMER COMPOSITES
(2021)
Article
Polymer Science
Yasemin Korkmaz, Kursat Gultekin
Summary: The effect of environmental conditions, such as UV irradiation, on epoxy polymers is a limiting factor for their outdoor applications. This study investigates the potential of incorporating boron nanoparticles to improve the resistance of epoxy adhesives against UV degradation. Experimental results indicate that the degradation of both bulk adhesives and adhesively bonded joints is reduced when reinforced with boron nanoparticles.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Materials Science, Multidisciplinary
Jie He, Jinwei Song, Yuanjie Xu, Xuanhe Zhang, Hongtao Zhou, Wenbin Zhang, Yufei Li, Weili Yan, Huijian Ye, Lixin Xu
Summary: Thermally conductive adhesives have been widely studied due to their dual functions in promoting interfacial bonding and thermal transfer. However, most existing strategies are based on non-recyclable irreversible covalent cross-linking resins. In this study, a strategy for in situ production of high-performance, recyclable thermal adhesives from common stocks using a reversibly cross-linkable hyperbranched-star copolymer, HBPE@PSF, was demonstrated. The copolymer, as a stabilizer, facilitated the exfoliation of hexagonal boron nitride (h-BN) to obtain high-quality boron nanosheets (BNNSs). The resultant composite adhesives, formed by combining BNNSs with the copolymer matrix through a solution cast process and cross-linking via the Diels-Alder reaction, showed excellent interfacial bonding, thermal transfer, and recyclability.
ACS APPLIED POLYMER MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yingfeng Wen, Chao Chen, Yunsheng Ye, Zhigang Xue, Hongyuan Liu, Xingping Zhou, Yun Zhang, Dequn Li, Xiaolin Xie, Yiu-Wing Mai
Summary: The integrated circuits industry is producing microelectronic components with higher integration levels, packaging density, and power density, which require better heat dissipation. Among various packaging materials, commonly used capillary underfill materials have low thermal conductivity, which cannot meet the heat dissipation requirements of high-power density IC chips.
ADVANCED MATERIALS
(2022)
Article
Polymer Science
Duanwei Zhang, Fusheng Liu, Sheng Wang, Mengxi Yan, Xin Hu, Mengying Xu
Summary: This article proposes a method to increase thermal conductivity by improving the matrix's lambda value and reducing interfacial thermal resistance. By designing and synthesizing D-GQDs with specific structures linked to epoxy resin, the thermal conductivity of the composite material was enhanced and a good thermal conductive and insulating packaging material was developed.
Article
Materials Science, Ceramics
ZhiJin Guo, WenBin Lu, Yan Zhang, JianPing Zhou, DaQian Sun
Summary: The addition of V2CTx two-dimensional materials in conductive adhesives increases the contact area between conductive particles, effectively reducing the resistivity of epoxy resin conductive adhesives. However, excessive content of V2CTx/Ag/rGO/MWCNTs can cause aggregation and increase the resistivity of the conductive adhesive. The volume resistivity of ECAs increases from 4.4 x 10-6 omega m to 1.15 x 10-5 omega m when the V2CTx/Ag/rGO/MWCNTs content increases from 0.1% to 0.34%. The interconnected Ag-clad Cu particles and V2CTx/Ag/rGO/MWCNTs form a larger conductive network inside the epoxy resin, resulting in good conductive properties of the adhesive.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Composites
Ning Guo, Zifan Tang, Jiaming Sun, Yulong Wang, Lili Li, Junguo Gao
Summary: In this paper, the influence of SiO2 particle size on the nonlinear electrical conductivity and breakdown characteristics of composites made of epoxy resin and micron silicon carbide was investigated. It was found that smaller SiO2 particle sizes resulted in lower current density at high fields and higher breakdown field strength. The addition of 25 μm SiO2 and 2 μm SiO2 slightly increased the nonlinear coefficients and significantly increased the breakdown field strengths. However, the addition of 60 nm SiO2 particles led to the most significant attenuation of conductivity current and enhancement of breakdown field strength, but with a decrease in nonlinear coefficient. Furthermore, increasing SiO2 doping amount resulted in a more obvious decrease in current density and dielectric constant.
POLYMER COMPOSITES
(2023)
Article
Engineering, Manufacturing
Weili Yan, Xuelong Chen, Jacob Song Kiat Lim, Hui Chen, Vincent Gill, Alexis Lambourne, Xiao Hu
Summary: This study successfully improved the dispersion performance of hexagonal boron nitride (hBN) in epoxy resin and achieved uniform filler distribution by using epoxy-assisted slurry-state ball milling. The thermal conductivity of the polymer was significantly enhanced, demonstrating the importance of this facile, time-effective, and scalable material preparation method for impregnation applications of thermally conductive composite resins.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Polymer Science
Xiao Ma, Wen-yan Wang, Xiao-dong Qi, Jing-hui Yang, Yan-zhou Lei, Yong Wang
Summary: A simple suction filtration method was developed to construct thermally conductive epoxy composites, where carbon nanofibers and graphene nanoplatelets form a self-supported framework, providing excellent thermal conductivity and comprehensive properties for the composites.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Fang Chen, Hua Xiao, Zhong Quan Peng, Ze Ping Zhang, Min Zhi Rong, Ming Qiu Zhang
Summary: The study developed a thermally conductive and self-healing glass fiber cloth reinforced epoxy composite by functionalizing hexagonal boron nitride with a natural substance, showing improved thermal conductivity and mechanical strength; the composite exhibited excellent thermal conductivities at 35.0 wt% h-BN content and achieved interlaminar crack healing and thermal conductivities recovery through a reversible reaction; the resulting composite also demonstrated controlled degradability and recyclability.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Chemistry, Physical
Wenqiang Qu, Penglu Wang, Xin Chen, Dengsong Zhang
Summary: This study focuses on the deactivation of TiO2 photocatalysts caused by trace exposure of sulfate in the atmosphere and proposes a strategy to manipulate the surface structure of the catalyst to maintain catalytic cycle balance. The findings offer a new approach for the development of efficient photocatalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Frank Marken, Junjie Shen, Tianting Pang, Dengsong Zhang, Davide Mattia
Summary: This study establishes an electrochemical impedance-based method to detect and investigate the electrochemical properties of activated carbon fibres (ACFs) without destroying their original weaving patterns. The weaving pattern plays a role in the electrochemical properties and desalination performance of ACFs, with knitted ACFs consuming less energy for removing the same amount of NaCl compared to woven ACFs.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Jiaxin Li, Fei Dou, Jiang Gong, Yanshen Gao, Yumeng Hua, Krzysztof Sielicki, Dengsong Zhang, Ewa Mijowska, Xuecheng Chen
Summary: To tackle the increasing production of municipal plastics, efforts have been made to recycle plastic waste into high-value-added products. With the introduction of transition-metal catalysts (Co3O4), mixed-waste plastics (PP/PE/PS) were carbonized into yolk-shell-structured (YSS) Co3O4@C nanomaterials with a high carbon yield of 49 wt%. These materials exhibited a high capacity of 1066 mAh g-1 and excellent cycling stability and rate performance in lithium-ion batteries (LIBs). This strategy provides a potential approach for recycling waste plastics and mass producing high-performance nanosized anode materials for LIBs in a commercial manner.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Xinyu Jia, Xiangyu Liu, Hengxiang Zhang, Jiebing He, Kai Zhang, Xiaonan Hu, Lupeng Han, Dengsong Zhang
Summary: Using commercial catalysts in non-electric industries is challenging due to the presence of complex flue gas containing alkali metals, heavy metals, and SO2, which can deactivate the catalysts. This study demonstrates that V2O5/CeO2 catalysts modified with inherent SO42- exhibit remarkable resistance to multi-poisons including K, Pb, and SO2. The mechanisms of multiple poisoning resistance are revealed, and the interactions between various poisons and different catalysts are elucidated. These findings provide insights into mitigating NOx emissions for non-electric industries.
Article
Engineering, Environmental
Boge Zhang, Yongjie Shen, Biyuan Liu, Jian Ji, Wenjing Dai, Pingli Huang, Dengsong Zhang, Guangqin Li, Ruijie Xie, Haibao Huang
Summary: Hydroxylation of the catalytic surface provides a new strategy for boosting the degradation of refractory volatile organic compounds (VOCs) at room temperature. This study demonstrates the successful ozone catalytic oxidation (OZCO) of toluene using a hydroxyl-mediated MnOx/Al2O3 catalyst. The catalyst exhibits excellent toluene degradation performance, with complete removal, high mineralization rate, and catalytic stability.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Xiaoyu Zhang, Yongjie Shen, Yuying Liu, Jiajia Zheng, Jiang Deng, Tingling Yan, Danhong Cheng, Dengsong Zhang
Summary: Researchers constructed a composite of layered metal oxides (NiMgAlOx) and boron nitride (BN) to form interface-confined NiMgAlOx/BN catalysts, which showed excellent sintering resistance and activation capacity of CH4 and CO2. The triple interface significantly enhanced gas activation and inhibited coke formation, making it promising for methane dry reforming.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Yue Che, Xiangyu Liu, Zhi Shen, Kai Zhang, Xiaonan Hu, Aling Chen, Dengsong Zhang
Summary: This study reports a Mn-based catalyst (Mn/ZrTi-A) using amorphous ZrTiOx as the support, which achieves excellent low-temperature NOx conversion and N-2 selectivity by highly dispersing the active MnOx species and constructing a uniquely bridged Mn3+ bonded with the support through oxygen linked to Ti4+ and Zr4+. This research investigates the role of an amorphous support in promoting the N-2 selectivity of a manganese-based catalyst and provides new insights for the design of efficient low-temperature deNOx catalysts.
Article
Chemistry, Multidisciplinary
Pan Zhang, Aling Chen, Tianwei Lan, Wenqiang Qu, Xiaonan Hu, Kai Zhang, Dengsong Zhang
Summary: In this study, tungsten-acidified and sulfated CeO2 catalysts were prepared, and operando spectroscopy was used to understand the dynamics of acid sites and redox sites on the catalysts during NH3-SCR reaction. It was found that both Lewis and Bronsted acid sites are necessary for the catalytic reaction, with Bronsted acid sites being the main active sites after treatment. The change of Bronsted acid sites significantly affects the removal of nitrogen oxides. Acid functionalization also promotes the cycle of cerium species for NOx reduction. This work is crucial for understanding the nature of active sites and provides new insights into the mechanism of NH3-SCR over CeO2-based catalysts.
Article
Engineering, Environmental
Zhi Shen, Penglu Wang, Xiaonan Hu, Wenqiang Qu, Xiangyu Liu, Dengsong Zhang
Summary: This study demonstrates a self-adaptive alkali-tolerance mechanism by using amorphous FePO4 as a support, which achieves higher resistance to K2O through ultrahigh potassium storage capacity. It also exhibits excellent resistance to alkali metals, alkali earth metals, and heavy metals, providing long durability in flue gas with multipollutants.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Zhi Shen, Aling Chen, Yongjie Shen, Xiangyu Liu, Qiuying Yi, Penglu Wang, Kai Zhang, Dengsong Zhang
Summary: It was unexpected that HCl could have promotional effects on CeO2-based catalysts for NOx reduction against alkali poisoning. HCl modified the surface of CeO2, providing additional acid sites for ammonia adsorption and neutralizing alkali metal. This study reveals the multi-promotion mechanisms of HCl modified cerium-based NOx reduction catalysts, offering a new approach for developing highly efficient NOx reduction catalysts.
Article
Green & Sustainable Science & Technology
Jiang Deng, Sha Wang, Tianwei Lan, Shiqi Guo, Kai Zhang, Dengsong Zhang
Summary: The use of catalysts is crucial for reducing emissions and improving sustainability in industrial processes. However, the poisoning of catalysts by alkali and heavy metals can limit their effectiveness and increase environmental impacts. This study proposes a precise regeneration approach for metal-poisoned catalysts, using the Sabatier principle and formic acid, which showed high removal efficiency for metal poisons and retention of active species. This approach not only extends the catalysts' lifetime, but also reduces the environmental impact of spent catalyst disposal.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Kai Oshiro, Min Gao, Lupeng Han, Dengsong Zhang, Jun-ya Hasegawa
Summary: In this study, the role of induced Fe and H2SO4 in preventing alkali poisoning was investigated. The results showed that Fe and H2SO4 can promote the formation of oxygen vacancies and generate characteristic adsorption sites, protecting NH3 adsorption sites on the catalyst surface from potassium poisoning. These findings are important for understanding the ability of metal oxide-based catalysts with sulfate ion against alkali poisoning and facilitating the tailored design of alkali tolerance catalysts.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Energy & Fuels
Chengbiao Zhang, Zhi Shen, Xiangyu Liu, Jiang Deng, Aling Chen, Tingting Yan, Dengsong Zhang
Summary: This study demonstrates that the TiOSO4/CeO2 catalyst has natural resistance to multiple poisons, even when contaminated with K2O and PbO, the catalyst retains a high NOx conversion rate across a wide temperature range and shows excellent tolerance to SO2.
Article
Chemistry, Multidisciplinary
Ruoqing Wu, Tingting Yan, Kai Zhang, Zhenlin Wang, Haiyan Duan, Qiuying Yi, Danhong Cheng, Dengsong Zhang
Summary: This study demonstrates the highly selective tandem electroreduction of nitrate to N-2 using bimetallic hollow nanobox catalysts based on copper and cobalt. By combining direct electron reduction and hydrogen reduction through bimetallic tandem catalysis, efficient and highly selective removal of nitrate was achieved. The bimetallic catalyst offered ultrahigh electrocatalytic performance in Cl-free systems, providing technical support for environmental nitrate remediation.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Chemistry, Physical
Liumei Ge, Aiyong Wang, Xiaonan Hu, Jin Zhang, Jiebing He, Penglu Wang, Lupeng Han, Dengsong Zhang
Summary: This study demonstrates NOx reduction against sulfur poisoning using Ce-modified Cu-SAPO-34 catalysts. The catalyst modified with 0.5 wt% Ce shows remarkable sulfur tolerance during NH3-SCR of NOx. The SCR performance of the sulfur-poisoned catalysts is significantly improved due to the positive role played by Ce in reducing deposited sulfate species. The Cu-SAPO-34 catalyst incorporating 0.5 wt% Ce can maintain more active Cu2+ after sulfur poisoning due to enhanced binding of Cu2+ ions to the SAPO-34 framework. This work paves the way for the development of highly efficient catalysts against sulfur poisoning for NOx reduction.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
