REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Lin Chen,Shuangshuang Wang,Yingying Zhang,Yuchao Li,Xiangcai Ge,Guang Li,Liping Wang
In this work, N-hydroxyphthalimide (NHPI) was used as catalyst to cleave C H bonds in polyethylene glycol (PEG) backbones to generate carbon free radicals that reacted with the N N bonds of di-tert-butyl azodicarboxylate (DBAD) to form C N grafts (PEG-g-DBAD). Subsequently, the tert-butoxycarbonyl (-Boc) groups of PEG-g-DBAD were removed by treating with trifluoroacetic acid (TFA) to obtain hydrazino functionalized PEG (PEG-g-NHNH 2 ). The structure of functionalized PEG was confirmed by Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR), elemental analysis and size exclusion chromatography (SEC). Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were applied to investigate thermal stability and crystallization properties of the functionalized PEG. The synthesized PEG-g-NHNH 2 could be used to toughen epoxy resin (EP). The results of mechanical testing and SEM images indicated that the compatibility between PEG backbones and EP has been improved due to the existing of hydrazino groups . The grafted hydrazine groups could also react with 2-bromoisobutyryl bromide (BIBB) to obtain PEG-g-BIBB which initiated the polymerization of (methyl) methacrylate (MMA) by ARGET-ATRP. Thus, we presented a methodology with high efficiency for hydrazination of PEG under mild condition, and the functionalized PEG might have many potential applications.
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Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 24
·3528-3533
·
IF 4.592
Shi Huang,Wenquan Zhang,Tianlin Liu,Kangcai Wang,Xiujuan Qi,Jiaheng Zhang,Qinghua Zhang
Graphical Greener rocket fuels : A series of N -alkylimidazole borane compounds has been synthesized, which display hypergolic reactivity with the oxidizer of white fuming nitric acid. Compared with popular hypergolic ionic liquids, these fuels have the advantages of low viscosity and cost-effectiveness, and easily scaled-up production. Over the past few decades, toxic and highly volatile hydrazine derivatives have been the main fuel choices for liquid bipropellants, especially in traditional hypergolic rocket engines. The search for new hypergolic fuels as replacements for hydrazine derivatives is of great interest to researchers. In this study, a series of N -alkylimidazole borane compounds has been synthesized and characterized. Interestingly, these compounds display promising applications as potential hypergolic fuels owing to their excellent physiochemical properties including low melting points, high thermal stability, low viscosities, and unique hypergolic reactivity. Compared with popular hypergolic ionic liquids, the cost-effective and scaling-up advantages of these materials highlight their promising potential as high-performance fuels in liquid bipropellant formulations.
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DOI
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122011
·
IF 7.5
Di Jin,Yunpeng Zou,Yang Zhao,Shuai Chen,Shiwei Luo,Taotao Chen,Jinchuan Zhang,Jialin Chen,Jijie Li,Yuewen Mu,Wen-Yan Zan,Fengwei Zhang
Transition metal-nitrogen-carbon (M-N-C) catalysts show great promise for converting CO₂ into valuable fuels and chemicals via electroreduction (CO₂RR). Nonetheless, controversy remains regarding which specific MNₓ coordination structure in M-N-C catalysts governs CO₂RR performance. We synthesized a series of Ni-NOMC catalysts with high specific surface area and varying NiN₃-Pyr site loadings using SBA-15 as a template, employing a small molecule condensation and pyrolysis strategy. Aberration-corrected scanning transmission electron microscopy (AC-STEM) and X-ray absorption spectroscopy (XAS) confirmed the presence of atomically dispersed Ni sites coordinated by pyrrolic nitrogen (NiN₃-Pyr). The Ni-NOMC-3 catalyst, with a higher NiN 3 -Pyr loading, achieved a remarkable CO Faraday efficiency (FE CO ) of 99.6% at −0.57 V vs. the reversible hydrogen electrode (RHE), while maintaining FE CO > 99% across a broad potential window (−0.17 to −0.97 V vs. RHE). Moreover, the ordered mesoporous structure of this catalyst enhances mass transport properties and optimizes active site accessibility, enabling a high CO partial current density of 157 mA·cm⁻² in a flow cell system. Theoretical simulations further reveal that the NiN₃-Pyr coordination structure exhibits superior catalytic performance for CO₂RR-to-CO compared to other possible NiN x configurations.
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InfoMat
·
2019
·Vol. 1
·期 4
·542-551
·
IF 0
Yong Zhang,Xiaojie Xu,Xiaosheng Fang
The heterojunction photodetector between n-SrTiO 3 (n-STO) and p-CuS-ZnS (p-CZS) is prepared by a simple chemical bath deposition. The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm light illumination, including high photosensitivity (on/off ratio of 300), fast response speed (0.7/94.6 ms), and good wavelength selectivity (410-380 nm). More importantly, the self-powered n-STO photodetectors can be regulated by varying the composition of CZS film (p-CZS, p-CuS, and n-ZnS). All devices exhibit a large open-circuit voltage and show different self-powered behaviors because of the different built-in electric fields. The open-circuit voltages of the CZS/STO, CuS/STO, and ZnS/STO devices are measured to be 0.56, 0.30, and 0.35 V, respectively. This work provides a simple and effective way to fabricate tunable self-powered photodetectors by varying the composition of the nanocomposite film.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Linkang Li,Jun Li,Wanzhen Fo,Yuxing Lei,Shengkai Wen,Qiuhong Yang,Jianhua Zhang
With the continuous attention to environmental issues, it is still a very important issue to study the gas sensor with high sensitivity, high selection and high stability at room temperature (28 ℃). In this work, we used electrospinning to prepare Zr-doped SnO 2 nanofiber field-effect transistors (FETs). The mobility ( μ ) of SnZrO nanofiber field-effect transistors is 1.21 cm 2 /Vs and the threshold voltage ( V TH ) of 1.1 V. When used for the detection of N,N-dimethylformamide (DMF) vapour, the SnZrO nanofiber field-effect transistors exhibit excellent performance for DMF vapour at 28 ℃, including when the DMF vapour concentration is 500 ppb, the maximum response value is as high as 91.7; excellent gas selection characteristics; fast response and recovery time (57/10 s); low concentration (50 ppb) detection stability；low theoretical detection limit (1 ppb). In addition, capacitive-voltage ( C-V ) analysis is used to further explore the internal mechanism of DMF sensing. The Zr-doped SnO 2 nanofiber field-effect transistors prepared by electrospinning provides a new strategy for exploring DMF sensors with high selectivity and high sensitivity at room temperature.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Zhijia Zhang,Xiaole Zhao,Yingchun Su,Defeng Xing,Xiaojun Han
We demonstrate that antibacterial agent N , N′ -[(4, 5-dihydroxy-1, 2-phenylene)bis(methylene)]bisacrylamide (OHABA) can be assembled on the surface of vinyl organosilicon nanospheres (VOSNs) by atom transfer radical polymerization (ATRP). Chemically cross-linked vinyl organosilicon cores were facilely fabricated by sol-gel method as support, which densely grafted poly-OHABA (POHABA) as shells. Antibacterial assessment test results revealed that POHABA-based core@shell structure displayed high antibacterial performance, long-term stability, and kept broad-spectrum antibacterial effect of against Gram-negative and Gram-positive bacteria.
研究领域:
材料科学
·
纳米医学
·
抗菌材料
·
高分子化学
·
表面功能化
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高影响因子
ACS Macro Letters
·
2026
·
IF 4.9
Shu Nian-Zu,Li Hao-Tian,Peng Yu-Qing,He Guo-Long,Gu Jie,Li Yong-Qing,Cao Yu-Cai,Zhang Chuan-Lei
The synthesis of ultrahigh-molecular-weight polyethylene
(UHMWPE)
is often hampered by the inherent compromise in traditional catalysts,
such as Ziegler–Natta systems, which struggle to balance high
activity with precise control over molecular parameters. Covalent
organic frameworks (COFs) offer a promising alternative, allowing
for atomic-level design through their tunable pores and microenvironments.
In this work, we address this challenge by designing a series of Zr@COF
catalysts─denoted as Zr@PQ-TFPB (O–Zr–O), Zr@PQSO-TFPB
(N–Zr–O), and Zr@PQDO-TFPB (N–Zr–N)─to
systematically investigate the role of the coordination environment.
Spectroscopic and catalytic studies reveal that the N–Zr–N
configuration in Zr@PQDO-TFPB optimally reduces the electron density
at the Zr center. This electronic modulation, characterized by reduced
electron density at the Zr center, facilitates ethylene adsorption/insertion
while suppressing β-H elimination, leading to a superior polymerization
activity of 3.87 × 10 5 g·mol Zr –1 ·h –1 at 3.0 MPa─66%
and 38% higher than its O–Zr–O and N–Zr–O
analogues, respectively. This catalyst produces UHMWPE with a high
molecular weight of 1.71 × 10 6 g·mol –1 and a relatively narrow dispersity ( Đ = 2.2).
Furthermore, the rigid nanochannels of the COF provide a confining
effect that stabilizes the growing polyethylene chains. Our findings
underscore a critical synergy between coordination-induced electronic
effects and spatial nanoconfinement, providing a novel design principle
for next-generation polyolefin catalysts.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Danyang Liu,Miaomiao Jing,Qiang Zhao,Junli Wang,Zhifang Jia,Zuopeng Li,Kewei Wang,Yong Guo,Yuanzhen Ke
A novel S-scheme heterojunction N,S-NiFe-LDH/N-Bi₂MoO₆ was successfully constructed. • 5 wt% N,S-NiFe-LDH/N-Bi₂MoO₆ showed the highest activity, degrading 86.3% of TC in 100 min under visible light. • Element doping and interface engineering synergistically enhanced visible-light absorption and charge separation. • ·OH and ·O₂ − were the dominant active species responsible for TC degradation. A step-scheme (S-scheme) heterojunction photocatalyst was constructed via a hydrothermal method, consisting of N,S co-doped NiFe layered double hydroxide (N,S-NiFe-LDH) and nitrogen-doped bismuth molybdate (N-Bi₂MoO₆). The morphology, crystal structure, optical properties, elemental valence states, and charge separation/transport performance of the composite catalyst were systematically investigated using various characterization techniques, including SEM, TEM, HRTEM, XRD, UV–Vis DRS, XPS, and EIS. Its photocatalytic activity was evaluated through tetracycline (TC) degradation experiments under visible light irradiation, and the catalytic mechanism was elucidated by EPR radical detection. The results showed that the incorporation of N,S-NiFe-LDH enhanced the photocatalytic performance of the composite catalyst. Among the tested samples, the 5 wt% N,S-NiFe-LDH/N-Bi₂MoO₆ composite exhibited the highest degradation efficiency, achieving 86.3% TC removal within 100 min. The synergistic interaction between N,S-NiFe-LDH and N-Bi₂MoO₆ promoted the separation efficiency of electrons and holes, thereby significantly enhancing the photocatalytic activity.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Zongsheng Chen,Yanxi Ma,Hui Kang,Ting Liu,Hao Song,Ludan Chen,Yingluo He
The development of highly active catalysts for the catalytic conversion of oxygen-containing aromatics in lignite under mild conditions is of crucial importance for the production of clean liquid fuels. In this study, an in situ nitrogen-doped carbon-coated Ni@C/g-C 3 N 4 catalyst was fabricated. The abundant lone-pair electrons on nitrogen atoms within the g-C 3 N 4 support can coordinate with nickel, facilitating the migration of electrons toward the nickel surface. This electron transfer process favors the formation of Ni δ+ active sites with low electron cloud density, thereby enhancing the hydrogenation catalytic activity of the catalyst. The catalyst exhibited exceptional performance in lignite hydrodeoxygenation (HDO): under conditions of 80 °C, 1.5 MPa H 2 , and a reaction time of 1.5 h, 100% conversion of the lignite model compound benzyl phenyl ether (BOB) was achieved. Furthermore, the catalyst demonstrated remarkable hydrodeoxygenation activity, with high selectivity toward various oxygen-containing model compounds, including methyl nonanoate and 2,6-dimethylphenol. The optimal catalyst was applied to the catalytic conversion of the soluble portion (SP) of Naomaohu coal (NMHC). Results indicated that, compared with the SP, the hydrogenated soluble products from catalytic hydrogenation conversion (SP CHC ) showed a significant increase in the variety and quantity of aromatic and alkane compounds, while the relative contents of phenols, alcohols, esters, and ethers were reduced. These findings fully confirm that the Ni@C/g-C 3 N 4 catalyst can effectively cleave C C and C O bonds during the hydrogenation conversion of the SP, providing theoretical guidance for the conversion of lignite into high-quality clean liquid fuels.
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JOURNAL OF ORGANIC CHEMISTRY
·
2026
·
IF 3.3
Yanrui Wang,Weiqi Zhu,Jiangbin Yang,Zihui Lu,Yu Ding,Jianchun Wang,Honghua Rao
Transition metal (TM)-catalyzed direct C–H amination on free and fused pyridines is challenging, while it is much easier for their N-oxide derivatives. Unfortunately, most TM-catalysis is commonly used for nondeoxyamination and often limited to specific N-oxide and amine substrates. We herein disclose a combination of a copper(I) catalyst and dppf for deoxygenated oxidative C–N coupling of azine N-oxides to realize facile aminations on their parent azines, wherein dppf plays a crucial role in the deoxygenation step in the catalytic cycle. Moreover, this protocol tolerates a wider variety of N-oxides and free alicyclic amines to promise broader application potential.
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高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2014
·
IF 0.74
Yan Xue,Dafu Wei,Anna Zheng,Yong Guan,Huining Xiao
Cationic star polymers as drug/gene carriers have attracted increasing attention. Herein, environmental sensitivities and star-shaped architecture were combined into a well-defined gene carrier system, and further amphiphilic modification was conducted. The thermo- and pH-sensitive behaviors of poly[N,N-(dimethyl amino)ethyl methacrylate] (PDMAEMA) star polymers before and after amphiphilic modification in aqueous solutions were investigated. The observed lower critical solution temperature (LCST) increased with increasing arm length due to the increase of hydrophilicity. A significant decrease of the LCSTs with increasing pH and ionic-strength of the solution was found. The incorporation of MMA and BA lipophilic moieties decreased the LCST of the cationic star polymer due to enhanced hydrophobic interaction. As a potential gene carrier, the performance of star polymers on binding DNA was primarily evaluated via particle size, zeta potential, and gel retardation measurements. All the complexes formed stable small particles with diameter of 100∼150 nm at N/P ratio higher than 3.0. The electrostatic screening effect and facilitation for the interaction of complexes with cell membrane induced by the incorporation of lipophilic units were expected to enhance the gene transfection efficiency.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Kailei Ding,Cheng Zheng,Xueyu Huang,Li Yang,Yang Lei,Yunbing Wang
Bioprosthetic heart valve thrombosis (BHVT) is no longer considered a rare clinical entity in recent years and could cause valve motion abnormalities, which requires reoperation. Currently reported modifications of bioprosthetic heart valves (BHVs) mainly focused on improving the anti-calcification property. However, it was hard to improve their anti-thrombogenicity and crosslinking efficiency at the same time. Here we reported a method that combines improved hemocompatibility , crosslinking efficiency, cytocompatibility, and anti-calcification property for BHVs. Porcine pericardia (PPs) and 2-amino-4-pentanoic acid (APA) were first co-crosslinked with glutaraldehyde to introduce allyl moieties to the PPs, then poly(N, N-dimethylacrylamide) (PDMAA) was covalently immobilized on PPs through radical polymerization . In vitro and in vivo studies demonstrated that the structural stability of PDMAA modified PPs was much superior than that of traditional glutaraldehyde crosslinked PPs (GA). The PDMAA modified PPs exhibited enhanced antithrombogenic performance with a 75% decrease of platelet adhesion compared with GA. Moreover, the calcium content accumulated on the modified PPs after 90-day rat subcutaneous implantation decreased 93.5% compared with that on GA. The PDMAA modified PPs may alleviate BHVT and calcification, offering a potential option for BHVs fabrication in the future.
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