TRANSITION METAL CHEMISTRY
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2017
·Vol. 42
·期 4
·273-283
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IF 1.358
Fang Dong-Lin,Mo Shao-Yin,Wu Kai-Fei,Huang Zhong-Jing
Three coordination polymers have been obtained by hydrothermal synthesis, namely [Zn(imip)(H 2 O) 2 ]·0.5H 2 O ( 1 ), [Co(imip)(H 2 O) 2 ]·0.5H 2 O ( 2 ), and [Cd 2 (imip) 2 (H 2 O) 3 ] ( 3 ) [H 2 imip = 5-(1H-imidazol-1-yl) isophthalic acid]. The coordination polymers were characterized by IR spectra, elemental analysis, powder X-ray diffraction, and thermogravimetric analysis. Furthermore, single-crystal X-ray analysis reveals that they have 2D structures, which are extended into 3D networks via O–H···O hydrogen-bonding interactions. The luminescent properties of these coordination polymers were investigated.
研究领域:
无机化学
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配位化学
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晶体工程
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材料化学
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光物理
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Runyin Li,Shuangbo Yin,Tong Zheng,Chenju Zhang,Jiawen Hou,Pingchuan Sun,Yun Gao,Xiaoliang Wang
Mediums and particles could form a typical shear thickening fluid (STF) whose viscosity increased significantly while shear rate was larger than the critical value. Such jump of viscosity could be controlled by particle-medium interactions. The quantitative relationship between particles and different mediums was still less studied. We used polyethylene glycol 200 and silica nanospheres as a typical STF. The bridging effect may cause a gel while bad medium, like water, made STF dysfunctional. The relaxation behavior and the dynamical heterogeneity of these samples were characterized by solid-state 1 H low-field NMR. One mediate apparent spin-spin relaxation time ( T 2 ) could be found by fitting fully refocused FID in the typical STF. A strong interaction with typical T 2 of 0.14 ms was extracted in particle gels with bridging effect. Interestingly, when two good mediums were mixed, STF became gel-like and their T 2 decreased more rapidly than single medium with increasing particle content. On the contrary, bad medium preferentially lubricated particle surface and broke original particle-medium interactions, which was evidenced by a higher T 2 value when small amount of bad medium was added. Such dynamic information obtained from NMR agreed well with the corresponding rheology behavior. A tentatively quantitative criterion of dynamics was proposed to judge whether shear thickening can occur in a particle suspension.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
·
IF 6.2
Shan-Peng Ma,Cong Wang,An-Zhen Chen,Xiu-Li Zhang,De-Peng Wang,Hong-Bing Liu
Glycerophospholipids (GPLs) are typical membrane lipids with important physiological and pharmacological functions, but little is known about their distribution characteristics in economic seaweeds. This study established a systematic evaluation method, including conventional 2D 1H–31P heteronuclear multiple bond correlation (HMBC) NMR for identifying GPLs and 1D 31P NMR for determining the contents, which were then applied to reveal subclasses characteristics of GPLs in 18 economic seaweeds in Asia. The results indicated that phosphatidylglycerol (PG) was the characteristic GPL subclass distributed in all of the 18 seaweeds (ranging from 0.08 to 1.75‰), generally with higher contents than that of known terrestrial plants. The characteristic chemical shifts of protons in the GPLs headgroup (H-1′) together with protons in the backbone (H-3) were summarized through 1H–31P HMBC spectrum, which were helpful in assigning GPL subclasses.
研究领域:
生物化学
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海洋生物学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 11
·期 2
·711-720
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IF 3.119
Shizhu Song,Tao Yang,Rongwei Shi,Qi Li
High-density nitrogen-doped porous carbon catalysts have been regarded as promising alternatives to precious metals in proton-exchange membrane fuel cells (PEMFC) and metal–air batteries based on the oxygen reduction reaction (ORR). We herein synthesized high-density pyridinic and graphitic N-doped hollow carbon nanospheres (G&P N-HCS) using a high-yield amino-1H-tetrazole (ATTZ) via a self-sacrificial-template method. The synthesized G&P N-HCS shows a high N content (15.2 at%), in which pyridinic (Pr) and graphitic (Gr) N are highly reactive for the ORR catalysis. We found that the half-wave potential and limiting current density of G&P N-HCS are comparable to the state-of-the-art Pt/C, whereas its cyclic durability is much superior to that of Pt/C. Experimental results indicate that an optimal ratio (1 : 1) between Gr N and Pr N in G&P N-HCS exhibits the highest ORR performances, rather than Gr N-dominated N-HCS or Pr N-dominated N-HCS. Notably, N-HCS containing only Gr N and Pr N has poor catalytic performance for ORR in alkaline electrolytes. Density functional theory (DFT) simulations untangle the catalytic nature of Pr and Gr N and decipher the relations between the N type(s) and total N content required for the ORR catalysis. This study provides a new way to design efficient N-doped porous carbon-enriched active sites, and solves the cathode catalyst in the commercialization of PEMFC and metal–air batteries.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
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2020
·Vol. 17
·期 2
·553-561
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IF 1.815
Wang Xuemei,Wang Xuan,Dong Miao,Li Zhiming,Liu Zhongxin,Lu Juyou,Lin Qiang,Yang Jianxin
A series of indole-1-carboxylic acid aryl esters was synthesized with indole and substituted phenols as raw materials. The structures of the target compounds were validated by IR and 1 H-NMR spectroscopies. The inhibitory activities of the target compounds and their potencies against marine fouling organisms were investigated. The results showed that the target compounds had significant inhibitory effects on the growth of three seaweeds: Isochrysis galbana , Platymonas subcordiformis, and Navicula , and the target compounds also had excellent inhibition on the survival of barnacle larvae. The substituent structure–activity relationships revealed a significant effect on biological inhibition activity: Compounds substituted by electron-withdrawing groups had greater bioactivities than those containing electron-donating groups. Release rate of antifoulant and marine field tests indicated the final compounds had an outstanding antifouling potency against marine fouling organisms.
研究领域:
海洋生物学
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有机化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 23
·13808-13816
·
IF 3.108
Cheng-Yang Cao,Song Lu,Dan Zhang,Lun-Lun Gong,He-Ping Zhang
The 5AT/Sr(NO3)2 mixture has recently attracted attention as a gas-generating agent for use in novel fire-suppression applications. However, it cannot provide the desired combustion behavior alone. Thus, nitroguanidine (NQ) was added as a fuel component to 5AT/Sr(NO3)2 in attempt to improve the mixture's combustion behavior. The effects of NQ on the thermal and burning characteristics of 5AT/Sr(NO3)2 were investigated. Thermogravimetry-differential scanning calorimetric (TG-DSC) analysis with four heating rates (5, 10, 15, 20 K min−1) under a nitrogen atmosphere was performed to determine the thermal characteristics and non-isothermal reaction kinetic parameters. The addition of NQ decreases the activation energy of the Stage II and III decomposition reaction, and accelerates the redox reaction and decomposition of Sr(NO3)2. Thermodynamic calculations and measurements of temperature profile and liner burning rates were performed to evaluate the combustion characteristics. Adding NQ decreased the adiabatic combustion temperature, outlet temperature, average flame height, flame oscillation frequency and pressure exponent of Vieille's equation, and increased the gas output and linear burning rate. Notably, mesa burning occurred when NQ was added, the mechanism of which is elaborated using a physical combustion model. The analysis deepens the understanding of when the gas-phase or condensed-phase reactions control the burning characteristics of the composite propellant.
研究领域:
材料科学
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燃烧学
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推进剂研究
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DOI
高影响因子
JOURNAL OF MEDICINAL CHEMISTRY
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2019
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IF 6.054
Jun-Jie Yang,Wei-Wei Yu,Long-Long Hu,Wen-Juan Liu,Xian-Hua Lin,Wei Wang,Qiansen Zhang,Pei-Li Wang,Shuo-Wen Tang,Xin Wang,Mingyao Liu,Weiqiang Lu,Han-Kun Zhang
The prostanoid EP4 receptor is one of the key receptors associated with inflammatory mediator PGE2-elicited immunosuppression in the tumor microenvironment. Blockade of EP4 signaling to enhance immunity-mediated tumor elimination has recently emerged as a promising strategy for cancer immunotherapy. In our efforts to discover novel subtype-selective EP4 antagonists, we designed and synthesized a class of 1H-1,2,3-triazole-based ligands that display low nanomolar antagonism activity toward the human EP4 receptor and excellent subtype selectivity. The most promising compound 59 exhibits single-digit nanomolar potency in the EP4 calcium flux and cAMP-response element reporter assays and effectively suppresses the expression of multiple immunosuppression-related genes in macrophage cells. On the basis of its favorable ADMET properties, compound 59 was chosen for further in vivo biological evaluation. Oral administration of compound 59 significantly inhibited tumor growth in the mouse CT26 colon carcinoma model accompanied by enhanced infiltration of cytotoxic T lymphocytes in the tumor tissue.
CAS / MDL:
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产品关联
DOI
PubMed
高影响因子
BIOTECHNOLOGY LETTERS
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2017
·Vol. 39
·期 8
·1229-1235
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IF 1.73
Wang Qianqian,Xu Yixiang,Xu Jiaqi,Wang Xudong,Shen Chen,Zhang Yan,Liu Xiufeng,Yu Boyang,Zhang Jian
Objectives To characterize glycosyltransferases from Bacillus subtilis ATCC 6633 and investigate their substrate specificity towards plant polyphenols. Results Among the cloned and expressed six UDP-glycosyltransferases (BsGT1-6), BsGT-1 showed activity with a wide range of polyphenols: morin, quercetin, alizarin, rehin, curcumin and aloe emodin. The gene of BsGT-1 has an ORF of 1206 bp encoding 402 amino acids. The recombinant enzyme was purified to homogeneity by Ni–NTA affinity chromatograph, and its biochemical characteristics were identified by HPLC–UV/MS, 1 H-NMR and 13 C-NMR. BsGT-1 has an MW of approx. 46 kDa as indicated by SDS-PAGE; its activity was optimal at 40 °C and pH 8.5. The Km value of BsGT-1 towards morin was 110 μM. Conclusions BsGT-1 from B. subtilis was cloned. It had high catalytic capabilities towards polyphenols which would make it feasible for the structural modification of polyphenols.
研究领域:
生物化学
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分子生物学
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酶学
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产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 41
·期 4
·2345-2352
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IF 0.88
Liu Bin,Li Xiao Fang,Zhang Jie,Wang Meng Ting,Zeng Rong Jin
The conjugate addition of bromoform with 2-aryliene-2,3-dihydro-1 H -pyrrolizin-1-ones in the presence of magnesium afforded novel 2,2-dibromo-3-arylspiro[cyclopropane-1,2′-pyrrolizin]-1′(3′ H )-ones in moderate yield. The structures of all the products were characterized thoroughly by 1 H NMR, 13 C NMR, infrared spectroscopy, and mass spectrum.
研究领域:
有机化学
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合成化学
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光谱学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Siyu Pang,Zhihao Si,Guozhen Li,Hanzhu Wu,Yuhui Cui,Changwei Zhang,Cong Ren,Shuai Yang,Shusheng Pang,Peiyong Qin
A high-quality mixed matrix membrane (MMM) with high flux and separation factor is fostered to enhance ethanol pervaporation . In this study, a fluorinated and defect-free ZIF-8/PDMS membrane was prepared by the covalent bonding among fluoromonomer, ZIF-8 particles and PDMS using a one-pot method. ZIF-8 is first modified with 3-amino-1,2,4-triazole (Atz) to graft –NH 2 groups, and then modified with glycidyl methacrylate (GMA). This was achieved by the amine-epoxide addition reaction (named GZIF-8) to facilitate covalent bonding with methacrylate-functionalized PDMS, where the interfacial compatibility ZIF-8 and PDMS is improved. Moreover, 1H,1H,2H,2H-perfluorooctyl methacrylate (13F) as F-monomer is introduced into the membrane formation process by the polymerization of methacrylate groups among 13F, ZIF-8 and PDMS, where a fluorinated structure with high hydrophobicity and low surface energy is formed. The pervaporation performance for a 5 wt% ethanol solution at 60 °C shows that the resulting MMM has a high separation factor of 9.5 and total flux of 1681 g m −2 h −1 under the optimized parameters of 3 wt% GZIF-8 loading and 12 wt% 13F amounts.
研究领域:
材料科学
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化学工程
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膜技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xiao Zhu,Shasha Feng,Shuaifei Zhao,Feng Zhang,Chong Xu,Min Hu,Zhaoxiang Zhong,Weihong Xing
Polytetrafluoroethylene (PTFE) nanofiber membranes have been widely used in various air purification applications attributed to their excellent thermal and chemical stabilities. However, in oily fume purification, oil aerosols can easily permeate through the oleophilic membrane, which may lead to pore blocking, and increased filtration resistance and energy consumption, finally reducing the filtration efficiency and lifespan of the membrane. Herein, we report a hierarchical SiO 2 @PTFE nanofiber membrane by coaxial electrospinning of SiO 2 nanoparticle dispersion as the shell spinning solution and PTFE emulsion as the core spinning solution, followed by in-situ surface grafting of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane. The prepared amphiphobic membrane has both superhydrophobicity and oleophobicity with the water and oil contact angles of 173° and 134°, respectively. It possesses uniform pore structures , high gas permeability (697 m 3 m −2 h −1 kPa −1 ), excellent oily fume filtration efficiency (˃99%), as well as a low pressure drop (2.5 kPa) during 60-min filtration. Furthermore, our perfluorinated amphiphobic SiO 2 @PTFE nanofiber membrane exhibits good reusable and stable properties. This work opens a versatile approach to design efficient functionalized membranes in the field of oily fume purification.
研究领域:
材料科学
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环境工程
·
纳米技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
·
IF 4.097
Zhu Yu,Zaiwen Tian,Zhengqian Li,Zaoli Luo,Yan Li,Yi Li,Jun Ren
In this paper, a thioacetal chemosensor 1 incorporating simultaneously a carbazole moiety and an azobenzene moiety was synthesized. Among other metal ions , Hg 2+ proved to be able to selectively induce both color and fluorescence changes of 1 . The mechanism of Hg 2+ -promoted cleavage of thioacetal was confirmed by 1 H NMR experiments. Upon the addition of Hg 2+ into the yellow CH 3 CN/H 2 O solution of 1 , the resultant azobenzene-containing thioglycolamide was precipitated from the solution as a mercuric salt, leading to a colorless solution. Therefore, a novel color change pattern was developed.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）