PHYSICS AND CHEMISTRY OF LIQUIDS
·
2024
·
IF 1.2
Shuting Wang,Xueli Zhou,Qingyuan Song,Yuhuan Chen,Fang Yang
In this work, the densities of CO2-loaded and unloaded alkanolamine (1) + N, N-dimethylacetamide (DMAC) (2) mixtures were determined at temperature of (288.15 to 323.15) K and 101 kPa. The alkanolamines were primary amines, 3-amino-1-propanol (3A1P) and 1-amino-2-propanol (1A2P), and tertiary amine, 3-dimethylamino-1-propanol (3DMA1P). There CO2-unloaded 3A1P/1A2P/3DMA1P + DMAC binary systems with the whole concentration and two CO2-loaded 3A1P/1A2P + DMAC systems with alkanolamine mass fraction of (0.2, 0.3 and 0.4) were investigated. Based on the density values of CO2-unloaded binary systems, the thermal expansion coefficient (αp), excess molar volume (VmE), and apparent molar volume (Vφ,i) were calculated and discussed in terms of intermolecular interactions and spatial structure. The VmE values were positive under the studied conditions and increased with the temperature, and the maximum followed the decreasing order of 1A2P + DMAC > 3DMA1P + DMAC > 3A1P + DMAC. Additionally, the VmE data were well fitted with the Redlich-Kister equation with a small standard deviation (σ ≤ 0.024). For the CO2-loaded systems, the density values were correlated with temperature and concentration using different empirical equations, and the average relative deviations (ARD%) were less than 0.299%.
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高影响因子
SYNTHETIC COMMUNICATIONS
·
2018
·
IF 1.377
Xinyuan Ma,Qiong Mo,Jie Chang,Kai Xie
This paper mainly studied Pd-catalyzed regioselective chlorination of disubstituted 1,2,3-triazoles directed by the 1,2,3-triazole ring. A series of regioselective chlorinated products were synthesized in 47–86% yields using Pd(OAc)2 as a catalyst and CuCl2 as a chlorinated reagent. This method provides a new mean for the synthesis of 1,2,3-triazole halides which combines the formation of C-X bond with C-H activation.
研究领域:
有机化学
·
合成化学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2015
·
IF 2.719
Qi Liu,Aizhen Huang,Nan Wang,Guan Zheng,Lihua Zhu
Analysis of perfluorooctanoic acid (PFOA) usually requires a combination of high-performance liquid chromatography and mass spectrometry , which is expensive and time-consuming. In the present work, water-soluble CdS quantum dots (QDs) were employed to develop a simple and rapid fluorometric method for the determination of PFOA. Strongly fluorescent CdS QDs were prepared by using 3-mercaptopropionic acid (MPA) as a stabilizer . It was observed that PFOA strongly quenched the fluorescence emission of the MPA-CdS QDs because PFOA promotes the aggregation of MPA-CdS QDs through a fluorine–fluorine affinity interaction. Under optimum conditions, the fluorescence intensity of MPA-CdS QDs was observed to decrease linearly with an increase in the concentration of PFOA from 0.5 to 40 μmol L −1 , with a limit of detection of 0.3 μmol L −1 . This new method was successfully implemented for the analysis of PFOA-spiked textile samples, with recoveries ranging from 95% to 113%.
研究领域:
分析化学
·
环境科学
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高影响因子
JOURNAL OF HETEROCYCLIC CHEMISTRY
·
2015
·Vol. 54
·期 1
·784-788
·
IF 0.787
Fang-Ming Wang,Dan Bao,Bing-Xiang Hu,Ze-Yu Zhou,Deng-Deng Huang,Li-Zhuang Chen,Yuan-Yuan Dan
A series of novel 10-substituted 3,6-diphenyl-9-aryl-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-dione derivatives 2 were synthesized by condensation of compounds 1 with amines, which the compounds 1 were synthesized by 5-phenylcyclohexane-1,3-dione and aromatic aldehydes according to Knoevenagel, Michael, and cyclization reactions in the presence of a very small amount of l-proline as catalyzed at room temperature. The structures of all the synthesized compounds were characterized by IR, 1H NMR, and MS. In addition, the molecular structures of compound 1a have been determined by single-crystal X-ray diffraction analysis.
研究领域:
有机化学
·
药物化学
·
生物化学
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 106
·期 7
·2403-2414
·
IF 5.56
Zhao Wenyu,Xie Haisheng,Zhang Xuehong,Wang Zhilong
Abstract Water–oil interface of bacterial cell-stabilized Pickering emulsions is an exceptional habitat for microbial assimilation of both hydrophobic nutrients solubilized in oil phase and hydrophilic ones solubilized in water phase. Crystal substrate inhibition, i.e., decreasing phytosterol degradation with the increase loading of crystal phytosterols, is always observed during microbial transformation of phytosterols into steroid synthons in Mycolicibacterium sp (China Center of Industrial Culture Collection, CICC 21,097) cell-stabilized Pickering emulsions. In the present work, we confirmed that crystal substrate inhibition was attributed to the interaction between M. neoaurum and phytosterol crystals that led to the detachment of bacterial cells from the oil–water interfaces in bacterial cell-stabilized Pickering emulsions. Under the selected operation condition (25 ml BEHP per 40 ml water, 60 g/L glucose, 25 g/L phytosterols), the product androst-4-ene-3, 17-dione (AD) and androsta-1, 4-dien-3, 17-dione (ADD) concentration increased linearly with the progress of microbial transformation and reached almost 6 g/L at the 11 th day. This is a paradigm for microbial transformation of crystal substrates as well as in the presence of other surface active additives (such as chitosan and nonionic surfactants) in bacterial cell-stabilized Pickering emulsions. Key points • Microbial transformation of crystal phytosterols in Pickering emulsions • Crystal substrate inhibition occurring during microbial transformation • Interaction between phytosterol crystals and bacterial cells leading to demulsification
研究领域:
生物技术
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微生物学
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化学工程
·
药学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Shikai Hu,Tao Shou,Mingming Guo,Runguo Wang,Jun Wang,Hongchi Tian,Xuan Qin,Xiuying Zhao,Liqun Zhang
Thermoplastic polyurethanes (TPUs) have received considerable attention because of their flexible structure and comprehensive performance. 3,3-Dimethyl-4,4′-diphenyl diisocyanate (TODI) was first introduced to fabricate high-performance TPU by tailoring the mole ratio of the hard segment to the soft segment and the molecular weight of the soft segment for three-dimensional (3D) printing. The influence of the microstructure on glass transition temperature, tensile strength, modulus, loss factor, and softening temperature was investigated. The annealing process was proved to increase the degree of microphase separation of TODI-based TPU. Compared with TPU derived from widely commercialized isocyanates, our prepared TODI-based TPU exhibited remarkably high heat resistance. In addition, it is worth noting that our TODI-based TPU prepolymer has long-term and stable storage, which is beneficial for industrial application. This work is crucial to fabricate new TPU elastomer materials with high heat resistance for 3D printing and evaluate the structure–property behavior of TODI-based TPU, which could help other researchers design TODI-based TPU.
研究领域:
高分子材料科学
·
材料化学
·
生物医用材料
·
增材制造
·
热力学性能
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功能高分子
·
结构-性能关系
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 10
·100548
·
IF 3.721
Yingying Zhang,Liming Xu,Jingkun Xu,Weiqiang Zhou,Hui Zhang
Poly(3,4-ethylenedioxythiophene) and its derivatives provide an excellent platform as electrode materials for supercapacitors due to their superior stability and conductivity. In this study, a poly(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methanol (PEDOT-MeOH) porous nanonet (PEDOT-MeOH-PNN), PEDOT-MeOH hollow nanotube array (PEDOT-MeOH-HNA) and PEDOT-MeOH-PNN coated PEDOT-MeOH-HNA (PEDOT-MeOH-PNN@PEDOT-MeOH-HNA) are successfully fabricated using a template-free electrodeposition of (2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methanol monomer. These three nanostructures were studied by Fourier transform infrared spectrum and Raman spectrum, scanning electron microscopy, thermal analysis and electrochemical methods, respectively. PEDOT-MeOH-PNN@PEDOT-MeOH-HNA has a specific capacitance of 40.5 mF cm−2 at 40 mV s−1, which is higher than PEDOT-MeOH-PNN (21.6 mF cm−2) and PEDOT-MeOH-HNA (35.5 mF cm−2). Moreover, the PEDOT-MeOH-PNN@PEDOT-MeOH-HNA based symmetric supercapacitor delivers excellent rate performance and superior cycling stability (90% of the initial capacitance remains after 10,000 cycles). The results indicate that the structural design of a supercapacitor electrode can improve their electrochemical performance, and promote the application and development of conducting polymers in the field of supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Tianlin Wang,Xu Gong,Chuanchao Shen,Guangren Yu,Xiaochun Chen
The accumulation of waste PET leads to serious environmental problem. PET degradation has been hot topic and is studied by lots of researchers. At present, numerous catalysts have been developed, among which ionic liquid catalyst is attractive due to its excellent advantages like convenient recycling and highly catalytic effect. In this work, a series of ionic liquids based on 1,1,3,3-tetramethylguanidine (TMG) were synthesized and used as catalyst of PET degradation. The influence of different structure of cation and different metal salt on PET degradation were studied. DFT calculation showed that the interaction between the ionic liquid and ethylene glycol can be changed by adjustment of the structure of the cation. At optimal condition, using [C 6 TMG]Cl/2ZnCl 2 as catalyst, PET conversion was 100% and BHET yield was 92.7%. To our best knowledge, this is first report about ionic liquid catalyst of PET degradation with superior BHET yield. Catalytic effect of [C 6 TMG]Cl/2ZnCl 2 did not obviously decrease after it was reused for six times. Moreover, the degradation of commercial beverage bottles was investigated using [C 6 TMG]Cl/2ZnCl 2 as the catalyst, the BHET yield of 84% was obtained, and the quality purity of the product was 90%. In addition, possible mechanism was explored.
研究领域:
环境科学
·
材料科学
·
化学工程
·
催化
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 41
·期 4
·2345-2352
·
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
·
合成化学
·
光谱学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yue Lei,Xin Xu,Junying Yin,Jianping Xu,Kang Xi,Lai Wei,Haihua Wu,Sen Jiang,Yunfang Gao
Commercial Li-ion batteries use LiPF6-based carbonate electrolytes extensively, but there are many challenges associated with them, like dendritic Li growth and electrolyte decomposition, while supporting the aggressive chemical and electrochemical reactivity of lithium metal batteries (LMBs). This work proposes 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFM) as a multifunctional electrolyte additive, constructing protective solid-/cathode-electrolyte interphases (SEI/CEI) on the surfaces for both lithium metal anode (LMA) and Ni-rich cathode to solve these challenges simultaneously. The highly fluorinated group (−CF3) of the HFM molecule contributes to the construction of SEI/CEI films rich in LiF that offer excellent electronic insulation, high mechanical strength, and surface energy. Accordingly, the HFM-derived LiF-rich interphases can minimize the electrolyte–electrode parasitic reactions and promote uniform Li deposition. Also, the problems of LiNi0.8Co0.1Mn0.1O2 particles’ inner microcrack evolution and the growth of dendritic Li are adequately addressed. Consequently, the HFM additive enables a Li/LiNi0.8Co0.1Mn0.1O2 cell with higher capacity retention after 200 cycles at 1 C than the cell with no additive (74.7 vs 52.8%), as well as a better rate performance, especially at 9 C. Furthermore, at 0.5/0.5 mAh cm–2, the Li/Li symmetrical battery displays supersteadfast cyclic performance beyond 500 h when HFM is present. For high-performance LMBs, the HFM additive offers a straightforward, cost-effective route.
研究领域:
材料科学
·
电化学
·
电池技术
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DOI
高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
·
2026
·Vol. 67
·期 2
·404-414
·
IF 1.5
You Z. L.,Song N. S.,Qiao Z. Y.,Feng X. H.
Aroylhydrazones with various substituent groups and their metal complexes have interesting biological activities. In this work, two new copper(II) complexes [Cu 2 (L a ) 2 ]2NO 3 ∙2MeOH ( 1 ) and [CuL b (CH 3 OH) 2 ]NO 3 ∙CH 3 OH ( 2 ), derived from the aroylhydrazones 4-hydroxy- N’ -(2-hydroxy-5-methylbenzylidene)-3-methoxybenzohydrazide (HL a ) and 4-hydroxy- N’ -(2-hydroxy-3-methoxybenzylidene) benzohydrazide (HL b ), were synthesized and characterized by physico-chemical methods such as elemental analysis and infrared spectroscopy. Structures of the complexes were confirmed by single crystal X-ray determination. The hydrazone ligands in the complexes coordinate to Cu ions through phenolate oxygen, imino nitrogen and carbonyl oxygen atoms. The Cu ions in complex 1 are in square planar coordination, and that in complex 2 is in square pyramidal coordination. Both complexes show good antibacterial activities on the bacterial strains Bacillus subtilis , Staphylococcus aureus and Escherichia coli , while weak activity on the fungal strain Candida albicans and no activity on Aspergillus niger .
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Cheng Xie,Fuyi Sun,Xunke Zhao,Cui Wu,Yuanyuan Che
A transient hot-wire method was used in this work to measure the thermal conductivities of methyl 2-methyl-3-nitrobenzoate (MMN) + acetonitrile, N-bromosuccinimide (NBS) + acetonitrile, and MMN + NBS + acetonitrile in the temperature range of T = (300–340) K. For binary systems, measurements were made for the mass fractions of MMN (ω1) range from 0 to 0.45 and the mass fractions of NBS (ω2) range from 0 to 0.30. For the ternary system, measurements were carried out with the ω1 + ω2 range from 0 to 0.45. The expanded uncertainties of the experimental data were estimated to be 2%, while the confidence level was 0.95 (k = 2). The experimental data were correlated as a function of the mass fraction and temperature using a linear thermal conductivity model. The maximum absolute relative deviation between the experimental values and the calculated results from the fitting model were 0.60, 0.16, and 1.30%.
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高影响因子
危险品化学品经营许可证（带存储）