Article
Polymer Science
Fan Yu, Pei Li, Mengli Xu, Guoyong Xu, Yinna Na, Shaojie Zhang, Fuzhou Wang, Chen Tan
Summary: This study investigated the influence of polyethylene glycol unit on nickel-catalyzed ethylene polymerization, finding that the molecular weight of products increased with the number of oxygen atoms on the polyethylene glycol unit. The introduction of MgCl2 support resulted in higher molecular weights and lower branch densities of polymers, with heterogeneous polymerizations generating polymers with excellent powder morphology.
Article
Chemistry, Applied
Hongwei Peng, Shuaikang Li, Gen Li, Shengyu Dai, Mingjun Ji, Zhe Liu, Lihua Guo
Summary: The addition of bulky rotation-restricted substituents into iminopyridyl Ni (II) and Pd (II) catalysts was shown to effectively retard chain transfer, resulting in high molecular weight polyethylene or ethylene-MA copolymers with high MA incorporation ratio. Systematic studies on the (co)polymerization behavior as a function of rotation-restricted substituent variations led to the successful synthesis of various molecular weight polyethylene and ethylene-MA copolymer products.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Quan Wang, Zhao Zhang, Chen Zou, Changle Chen
Summary: In this study, a simple cocatalyst strategy was designed to enhance the catalytic properties of various nickel catalysts in ethylene polymerization and enable control over product morphology.
CHINESE CHEMICAL LETTERS
(2022)
Article
Polymer Science
Menghe Xu, Yongzheng Liu, Wenmin Pang, Yao Pan, Min Chen, Chen Zou, Chen Tan
Summary: Two alpha-diimine nickel dimethyl complexes with different steric hindrance effects were synthesized and characterized. Organoboron cocatalysts B(C6F5)3 or [Ph3C][B(C6F5)4] can activate these complexes for ethylene polymerization without the need for any organoaluminium cocatalysts or scavengers. B1 exhibits higher catalytic activity than B2, resulting in polyethylenes with slightly lower molecular weight, higher branching densities, and lower melting temperatures. The resulting polyolefins also display good tensile and elastic properties. DFT calculations suggest that the counter anion derived from B1 contributes to increased stability and activity.
Article
Chemistry, Multidisciplinary
Mingjun Chi, Ao Chen, Wenmin Pang, Chen Tan, Changle Chen
Summary: The study of a series of nickel pre-catalysts revealed that substituents and positions both play crucial roles in determining the performance of catalysts. Electron-donating substituents make the catalysts sensitive to polymerization temperature, while catalysts bearing electron-withdrawing substituents exhibit relatively stable performance at different temperatures.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Shi-Yu Chen, Bai-Hao Ren, Shi-Huan Li, Yu-Hang Song, Shuang Jiao, Chen Zou, Changle Chen, Xiao-Bing Lu, Ye Liu
Summary: Transition-metal-catalyzed copolymerization produces polyketones materials with excellent properties. This study successfully synthesized a series of cationic P,O-coordinated Ni complexes catalysts with outstanding performance, which is a significant discovery in the field of Ni catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Wenbing Wang, Min Chen, Wenmin Pang, Yougui Li, Chen Zou, Changle Chen
Summary: Investigated two groups of norbornene comonomers: one provides additional active sites for sulfur vulcanization and the other can alter the non-polar nature of polyolefin materials. Palladium-catalyzed terpolymerization of ethylene with these comonomers yields polar-functionalized polyolefin elastomers with high molecular weight and comonomer content, possessing excellent mechanical and elastic properties.
Article
Polymer Science
Jiawei Chen, Wenbing Wang, Yao Pan, Dan Peng, Yougui Li, Chen Zou
Summary: In this study, direct copolymerization of plant oil-based copolymer monomers with ethylene was achieved using a dienyl phosphoribosulfonyl palladium catalyst (PO-Pd). Addition, ureido-pyrimidinone (UPy) functionalization was performed using the hydroxyl group of the polymer. The incorporation of biomass groups effectively modifies the surface and mechanical properties of the copolymers, and these newly developed polymers are ideal tougheners for gutter oil due to their excellent tunability of the self-complementary hydrogen bonding network (UPy).
Article
Polymer Science
Shabnam Behzadi, Chen Zou, Bang-Pei Yang, Chen Tan, Chang-Le Chen
Summary: A series of phosphine-sulfonate ligands with different vinylphenyl groups were designed, synthesized, and investigated in Ni- and Pd-catalyzed ethylene polymerization. The study found that the phosphine-sulfonate Ni complex bearing 2-vinylphenyl showed significantly increased thermal stability and polyethylene molecular weights compared to other complexes with different vinyl groups.
CHINESE JOURNAL OF POLYMER SCIENCE
(2021)
Article
Polymer Science
Muhammad Qasim, Wanlu Tian, Wenmin Pang, Yao Pan, Shabnam Behzadi, Min Chen
Summary: Designing and synthesizing easily available nickel based catalysts has become an attractive research direction in olefin polymerization. In this study, novel coumarin-type (NO)-O-boolean AND nickel catalysts with steric and electronic variations were synthesized and applied in ethylene polymerization, norbornene homopolymerization, and copolymerization. Sterically hindered catalysts Ni2-Ni4 showed good performance in generating polyethylene with higher molecular weight, while sterically less hindered Ni1 exhibited higher incorporation ratios in norbornene copolymerization. The simple synthesis and the possibility of tuning catalytic properties make this system highly attractive for further exploration.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Jian Xia, Ying-Feng Han, Shuqing Kou, Yixin Zhang, Zhongbao Jian
Summary: A series of flexible cyclohexyl/rigid aromatic phosphine-sulfonate palladium and nickel catalysts were designed and synthesized in this study. The steric effect of alkoxy substituents in the catalysts plays an important role in tuning polymer molecular weight and co-monomer incorporation in copolymers. The research demonstrated the high molecular weight and catalytic activity achieved by the catalysts in ethylene polymerization and copolymerization with polar monomers.
EUROPEAN POLYMER JOURNAL
(2021)
Review
Chemistry, Multidisciplinary
Chen Tan, Min Chen, Changle Chen
Summary: Transition metal-catalyzed olefin-polar monomer copolymerization has the potential to synthesize polar group-functionalized polyolefin materials. However, the traditional trial-and-error approach is challenging and time-consuming. Recent 'catalyst + X' strategies have emerged, which utilize the interactions between the catalyst and other components in the copolymerization system to influence the reaction and resulting material properties. This review summarizes selected examples of these strategies and discusses future perspectives.
TRENDS IN CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
You Ge, Shuaikang Li, Hui Wang, Shengyu Dai
Summary: The introduction of dibenzosuberyl substituent in the iminopyridyl nickel and palladium catalysts has been shown to retard chain transfer, leading to the production of polyethylene and ethylene-MA copolymers with higher molecular weight. The synergistic effect of phenyl and dibenzosuberyl groups enhances the function of the catalyst to suppress chain transfer and promote the formation of highly branched copolymers with high incorporation ratios of functionalized ethylene-MA co-oligomers.
Article
Chemistry, Inorganic & Nuclear
Shuyun Xu, Xuemeng Chen, Gen Luo, Wei Gao
Summary: In this study, two new oxygen-bridged dinuclear Ni(ii) complexes were successfully synthesized by reaction with oxygen in solvent, along with Ni(0) and Ni(i) complexes supported by two neutral ligands. These complexes showed promising catalytic performance at low temperatures.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Chen Tan, Chen Zou, Changle Chen
Summary: The study introduces an ionic cluster strategy for controlling product morphology and improving catalytic copolymerization performance in the synthesis of polar-functionalized polyolefins. This strategy is versatile, enhancing thermal stability of catalysts at high temperatures and enabling the homopolymerization of polar-functionalized olefins. It also results in polyolefin composites with tunable mechanical properties, showing potential as compatibilizing agents for polyolefin mixtures with other polymers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Statistics & Probability
Ting Tian, Jingwen Zhang, Shiyun Lin, Yukang Jiang, Jianbin Tan, Zhongfei Li, Xueqin Wang
Summary: This study utilized interventions implemented in China and applied them to simulate the potential outcomes in South Korea, Italy, and the United States. The results showed that mild interventions in the early stage were effective in controlling the epidemic, while stricter measures were necessary for severe outbreaks.
JOURNAL OF APPLIED STATISTICS
(2023)
Article
Computer Science, Artificial Intelligence
Jiangxin Yang, Lingyu Wang, Lifei Ren, Yanpeng Cao, Yanlong Cao
Summary: This paper proposes an end-to-end light field angular super-resolution network by exploiting structure and scene information to mitigate the trade-off between angular and spatial resolution. It utilizes a Light Field ResBlock to extract epipolar plane image features and scene features, and employs 4D deconvolution to upsample the angular resolution based on these features. The refinement network further exploits LF structure and scene information to alleviate artifacts induced by too little angular information.
APPLIED INTELLIGENCE
(2023)
Article
Computer Science, Artificial Intelligence
Yanpeng Cao, Xi Tong, Fan Wang, Jiangxin Yang, Yanlong Cao, Sabin Tiberius Strat, Christel-Loic Tisse
Summary: This paper proposes a method for enhancing low-light visible images by utilizing complementary edge/texture features from thermal images. The proposed TGLLE-Net, which incorporates a CDC-MRF module and a TGCB module, effectively extracts and enhances features from both visible and thermal channels. Experimental results demonstrate that TGLLE-Net outperforms existing methods in terms of restoration accuracy, visual perception, and computational efficiency.
Article
Computer Science, Artificial Intelligence
Yanlong Cao, Lingyu Wang, Lifei Ren, Jiangxin Yang, Yanpeng Cao
Summary: This paper proposes a view position prior-supervised light field angular super-resolution network to improve the trade-off between angular and spatial resolution in light field imaging. The asymmetric feature extraction block and spatial-angular interaction module are introduced to enhance feature extraction and establish view correlations. Experimental results demonstrate the superiority of the proposed method in various datasets.
Article
Engineering, Electrical & Electronic
Junwen Zhang, Guoqiang Li, Sizhe Xing, Nan Chi
Summary: With the adoption of the single-wavelength 50G PON standard, research on the next-generation optical access network beyond 50G has begun. Coherent passive optical network (C-PON) based on multi-access coherent optics and DSP is a promising candidate for future high-speed PON, thanks to its superior sensitivity. This paper reviews recent studies and progress on flexible C-PON in terms of access speed, multiple-access architecture, and deployment scenarios.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Yanlong Cao, Wenbin Zhu, Jiangxin Yang, Guizhong Fu, Dongyun Lin, Yanpeng Cao
Summary: Visual surface defect inspection is important for assessing product quality in various industrial applications, but it remains challenging to develop deep-learning-based approaches for industrial product defect inspection. To overcome this challenge, we propose a light-weight defect classification model based on pre-trained SqueezeNet architecture and introduce three effective techniques to achieve high accuracy with limited defective training samples. Experimental results validate the effectiveness of our method.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Physics, Applied
Yingzhe Wang, Xuefeng Zheng, Tian Zhu, Shaozhong Yue, Ailing Pan, Shengrui Xu, Peixian Li, Xiaohua Ma, Jincheng Zhang, Lixin Guo, Yue Hao
Summary: Degradation and defect evolution in GaN-based UV LEDs under 3 MeV proton irradiation were investigated thoroughly in this study. An intrinsic C-N-related defect with an abnormally decreased concentration after irradiation was identified. A defect evolution model under proton irradiation was established: C atoms departed from the C-N-related defect aligned along the dislocation in the active region stimulated by the displacement damage effect, leaving behind a nitrogen vacancy (V-N) aligned along the dislocation, accompanied by the generation of a non-interacting carbon interstitial (C-i). The increase in V-N and C-i jointly contributed to the decrease in optical power and the increase in leakage current.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Medicinal
Zhishan Xu, Mengke Xu, Xueya Wu, Sheng Guo, Zhongwei Tian, Di Zhu, Jixuan Yang, Jiyun Fu, Xi Li, Guozhen Song, Zhe Liu, Xiangfeng Song
Summary: This study reports a half-sandwich complex Ru(II) with aryl-bis(imino) acenaphthene chelating ligand, which induces immunogenic cell death (ICD) in melanoma in vitro and in vivo. The complex displays strong anti-proliferative and potential cell migration inhibition effects against melanoma cell lines. Furthermore, the complex drives the biochemical hallmarks of ICD in melanoma cells, leading to the activation of adaptive immune responses and anti-tumor immunity.
Article
Chemistry, Multidisciplinary
Beihang Ding, Lihang Jiang, Xiaohui Kang, Shengyu Dai
Summary: Usually, bulky steric substituents are needed on both sides of the ortho-aryl position to achieve efficient suppression of chain transfer in aniline-based late-transition-metal catalysts. However, this study demonstrates that a-diimine catalysts based on naphthylamine with only one bulky ortho-aryl substituent also have excellent capabilities to suppress chain transfer. The naphthylamine-based catalysts show superior abilities compared to aniline-based catalysts in suppressing chain transfer reactions and producing high molecular weight (co)polymers in ethylene (co)polymerization.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Automation & Control Systems
Wenbin Zhu, Rui Liang, Jiangxin Yang, Yanlong Cao, Guizhong Fu, Yanpeng Cao
Summary: In recent years, diverse detection methods have been proposed to achieve highly accurate image segmentation. However, low contrast and background noise interference still pose challenges to defect detection. Existing deep learning-based methods for defect detection mostly learn rich features on the whole image.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Polymer Science
Hua Wang, Zhou Lu, Shengyu Dai
Summary: The chain walking polymerization technology is convenient and efficient for the preparation of hyperbranched polyethylene and polar functionalized polyethylene. Two bis(benzocyclopentyl) a-diimine ligands and their corresponding Pd(II) catalysts were synthesized, enabling the polymerization of ethylene to generate hyperbranched polyethylene with low molecular weights and high branching densities. The Pd(II) catalysts also allowed the copolymerization of ethylene with MA to obtain hyperbranched E-MA copolymers with high MA incorporation ratios.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhou Lu, You Ge, Shengyu Dai
Summary: In this study, two a-diimine ligands and their corresponding nickel and palladium complexes were synthesized and used to explore the effect of axial flexible shielding on ethylene (co)polymerization. The nickel complexes showed high activity and produced lightly branched polyethylenes with high molecular weights, while the palladium complexes exhibited moderate activity and produced highly branched polyethylenes. Moreover, the size of the cycloalkyl ring in the a-diimine catalysts strongly influenced the ethylene (co)polymerization.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Lihua Guo, Pengwei Li, Jiaxing Li, Yuwen Gong, Xiaoyuan Li, Yiming Liu, Kaijian Yu, Zhe Liu
Summary: This study describes the synthesis and characterization of a new class of half-sandwich platinum group organometallic complexes, which exhibit potent anticancer activity and selectivity by chelating specific ligands. These complexes show high cytotoxicity against A549 lung cancer cells and have the ability to inhibit cell migration.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Chuangao Zhu, Beihang Ding, Shengyu Dai
Summary: In this study, a series of benzocycloalkyl or naphthyl pyridine-imine Ni(II) complexes with a single o-aryl dibenzosuberyl substituent were synthesized. These complexes exhibited high activity and appropriate molecular weights in ethylene polymerization, while suppressing chain transfer reactions. The resulting branched polyethylene waxes can be used in plastic processing, coating, and dyeing industries.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Hang Yin, Chongchao Zhang, Zengqiang Wang, Xiao Bai, Ziyin Yang, Zhe Liu
Summary: The reasonable design and construction of electrocatalytic nanomaterial is crucial to improve the performance of non-enzymatic electrochemical sensors. In this study, a P-Ru/NC nanocomposite was synthesized through one-step pyrolysis, which showed larger electrochemical surface area, rich active sites, and fast electron transfer rate. The sensor based on P-Ru/NC exhibited higher electrocatalytic activity and could detect H2O2 in a wide range with high sensitivity and low detection limit. Therefore, it provided an effective sensing platform for non-enzymatic detection of H2O2.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
