JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Liwei Cheng,Zhi Li,Jinlong Cui,Ran Zhu,Jia Li,Huibo Qin,Bei Liu,Guangjin Chen,Fulong Ning
In recent years, kinetic hydrate inhibitors (KHIs), as an important hydrate control method, have received extensive attention in the oil and gas industry. During the usage of KHIs, it is often necessary to add KHI synergists to maximize their hydrate inhibition performance. Therefore, the development of synergistic reagents with high-efficiency to improve inhibition performance of the KHIs is of great significance for the prevention and treatment of hydrates. In this work, we screened a series of imidazole reagents as KHIs synergists through experiments, and studied the synergistic mechanism between imidazole reagents and KHIs by molecular simulation. Our results demonstrate that the addition of low concentrations of imidazole reagents alone has no obvious inhibitory effect on methane hydrates, but show obvious synergistic hydrate inhibition effect with KHIs. Among the tested imidazole reagents, 2-propylimidazole shows the best synergistic effect with KHIs. The synergistic effect between 2-propylimidazole and KHIs is mainly reflected in two aspects. On the one hand, the adsorption of 2-propylimidazole molecules on the hydrate surface hinders the formation of hydrate. On the other hand, 2-propylimidazole molecules can promote the formation of methane bubbles and reduce the driving force for the formation of methane hydrates. Our research further expands the application of imidazole reagents in the prevention and control of hydrates, which is beneficial to enhance the commercial application of KHIs.
研究领域:
石油工程
·
化学工程
·
分子模拟
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2013
·
IF 1.959
Lina Zhang,Xinbing Chen,Fengqi Zhao,Xuezhong Fan,Pei Chen,Zhongwei An
Three series of 2-(4′-alkoxybiphenyl-4-yl)-1H-benzimidazole derivatives (nM-x), which possessed 5-nitrobenzimidazole (nM-N series), benzimidazole (nM-H series) or 5-methylbenzimidazole (nM-M series) units at the end of the molecule, were synthesised and characterised by infrared, 1H- and 13C-nuclear magnetic resonance spectra, electrospray ionisation-mass spectrometry and elemental analysis. Their phase transition behaviour was investigated by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. All the compounds exhibited enantiotropic smectic mesophases with wide temperature domains for a carbon number in the alkoxy chain from 6 to 16, where the mesophase ranges were 14–91°C and 17–99°C during heating and cooling processes for the nM-N compounds, 7–25°C and 8–49°C for the nM-H compounds and 48–81°C and 52–85°C for the nM-M compounds, respectively. The effect of the length of alkoxy chain on mesomorphic properties was discussed. The nM-N and nM-M exhibited a much wider mesophase range whether during heating or cooling process than the corresponding nM-H series, especially for the longer terminal chain (n > 8), which indicated that the substituent in the benzimidazole moiety was helpful in increasing the mesophase stability.
研究领域:
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 47
·期 6
·7123-7134
·
IF 2.807
Wang Pengjie,Xiong Liping,He Zhongyi,Xu Xin,Hu Jianqiang,Chen Qi,Zhang Renhui,Pu Jibin,Guo Lei
The corrosion inhibition effect and synergistic mechanism of novel imidazoline derivative (SMIF) and benzimidazole (BMZ) in 3.5 wt% simulated concrete solution were studied experimentally and theoretically. The complex inhibitors have the most outstanding inhibition efficiency when SMIF concentration is 0.1 g/L and BMZ is 0.9 g/L, the corrosion inhibition efficiencies of weight loss, Electrochemical Impedance Spectroscopy and Potentiodynamic polarization curve (Tafel) were 88.81%, 86.27% and 90.22%, respectively. Electrochemistry analysis results proved that the corrosion inhibition mechanism of the inhibitors in the corrosion solution was mainly the formation of a protective film on the surface of carbon steel. FT-IR, Energy Dispersive Spectroscopy and X-ray Photoelectron Spectroscopy all proved the existence of the protective film. Molecular dynamics proved that the composite inhibitor molecules could be stable on the surface of carbon steel and when consist of complex inhibitor was 0.1 g/L SMIF and 0.9 g/L BMZ the stable adsorption morphology were the highest. This work confirmed that SMIF and BMZ inhibitors have a good synergistic effect, greatly improving the inhibition efficiency and reducing the cost of corrosion inhibition, and has a certain guiding significance for synergistic inhibition.
研究领域:
材料科学
·
电化学
·
表面科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yu-Xuan Dai,Wen-Li Xin,Lian-Hua Xu,Ji Li,Yi-Xuan Li,Junji Li,Serge Cosnier,Xue-Ji Zhang,Robert S. Marks,Dan Shan
Rational design highly active transition metal or transition metal oxides/nanocarbon hybrids is one of the feasible way to deliver a cooperative oxygen reduction (ORR) with a synergistic effect of the hybrid interface. Herein, based on benzimidazole-5-carboxylate (BIMC), CoO/Co-N-C nanocomposites are fabricated via 2-methylimidazole (2-MeIm)-tuned “4-Self” strategy, namely, self-templating, self-adapting, self-assembly and self-catalysis. As a base competitive ligand with N and C sources, 2-MeIm modulates the dispersion of BIMC in methanol to generate collodial-like BIMC tiny particles, the coordination ability of BIMC to Co(II), the composition and morphology of the self-assembled precursor (Co-BM), and as well as the conductivity of the resultant electrocatalyst. Impressing, carbonization of Co-BM at 800 °C under N 2 atmosphere endows the pyrolysis product (Co-BM-800) with the well-dispersed Co/CoO riveted on nitrogen-doped carbon, as well as the enhanced ORR performance in terms of positive onset-potential (0.890 V vs. RHE), large diffusion limiting current density (5.21 mA cm −2 ), and high stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xue Tian,Shuang Wang,Jinsheng Li,Fengxiang Liu,Xu Wang,Hao Chen,Di Wang,Hongzhe Ni,Zhe Wang
Benzimidazole grafted polybenzimidazole cross-linked membranes (CPBIm-X) with outstanding phosphoric acid (PA) stability are successfully prepared. 2-chloromethyl benzimidazole (CMBelm) is grafted onto PBI mainchains and using 3-glycidoxypropyltrimethoxysilane (KH560) as a cross-linker. The benzimidazole sidechains can not only increase the basic sites but also allow the membrane to achieve higher phosphoric acid uptakes without sacrificing mechanical strength. Moreover, compared with the imidazole rings in the PBI backbone, the side chain with imidazole rings are flexible, which benefit the proton transportation and lower the activation energy. In addition, the mechanical strength of cross-linked membranes is excellent. For example, the tensile strength value of CPBIm-5 is 101.4 MPa, while that of the PBIm is 79.0 MPa. The proton conductivity is enhanced because the hydrolysis of KH560 resulting Si O Si networks structure, which can absorb more phosphoric acid. The Si O Si networks in the matrix can efficiently improve the stability of phosphoric acid (PA), the remaining weight of CPBIm-5 is 57% PA. Taking into account performance comprehensively, the weight of 5% KH560 is the optimum content. For example, the proton conductivity of CPBIm-5 is 0.092 S cm −1 at 180 °C. Compared to the pristine PBI, it is almost three-fold in proton conductivity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhen-Yu Chen,Qin-Long Hong,Hai-Xia Zhang,Jian Zhang
By enhancing steric hindrance of substituents on the imidazole ring, the fan-shaped molecule of a tridentate boron imidazolate ligand (KBH(2-ipim)3, 2-ipim = 2-isopropylimidazolate) with racemic chirality was obtained. Then, seven novel boron imidazolate frameworks (BIFs) were prepared by mixing KBH(2-ipim)3 ligands with various derivatives of benzene carboxylic acid under solvothermal conditions. All of these seven materials contain a ladder-like zinc-boron-imidazolate chain as a basic building block, and the ligand BH(2-ipim)3– exists in the same handedness in one chain. The structural variations are associated with the position of substituents of the auxiliary ligand. Of particular interest is the spontaneous resolution of BH(2-ipim)3– ligands into two independent enantiomorphous homochiral structures, BIF-131-S and BIF-131-R, which contain both a chiral chain and an absolute helix embedded in the nets.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 17
·2759-2766
·
IF 6.453
Zhigang Lv,Jing Liu,Wei Wei,Jie Wu,Wenquan Yu,Junbiao Chang
An intramolecular aryl C−H amination reaction has been achieved using molecular iodine as the sole oxidant for the synthesis of benzimidazole derivatives. The required substrates were readily prepared by addition or coupling of arylamines with the corresponding nitriles or aryl iodides. Iodine-mediated oxidative cyclization of these substrates in the presence of potassium carbonate (K 2 CO 3 ) as base afforded the corresponding products in moderate to good yields. The transition metal-free protocol presented here is insensitive to air and operationally simple. This versatile and eco-friendly synthetic methodology is broadly applicable to a variety of N -aryl-substituted amidines and pyridin-2-amines, and provides direct access to both 1 H -benzo[ d ]imidazole and pyrido[1,2- a ]benzimidazole derivatives from the corresponding precursors.
研究领域:
有机化学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Jian Wang,Guoliang Liu,Ailian Wang,Wenxi Ji,Longgui Zhang,Taoyi Zhang,Jing Li,Hongfei Pan,Haolin Tang,Haining Zhang
Development of simple synthetic strategy for polybenzimidazole-based membranes with high uptake and retention ability of phosphoric acid is essential for long-term practical applications of high temperature proton exchange membrane fuel cells. In this work, N, N -dimethylacetamide is used as both deacid reagent and solvent for N-alkylation reaction to synthesize imidazolium cations-grafted polybenzimidazole. The accordingly formed membranes exhibit the improved uptake and retention ability of phosphoric acid compared to pristine polybenzimidazole membrane. The optimized membrane with grafting degree of 60% has an acid uptake of 361.2 wt% with an anhydrous proton conductivity of 75.2 mS cm −1 at 160 °C, about 4.2 times higher than that of pristine polybenzimidazole membrane. After the acid retention test at 160 °C for 240 h, proton conductivity of the optimized membrane decreases by 7.5%, lower than that of pristine polybenzimidazole membrane under the same conditions (11.9% loss). The thus-assembled single cell delivers the power density of 0.429, 0.596, and 0.708 W cm −2 under 0, 100 and 200 kPa back pressures whereas the values are 0.319, 0.427 and 0.510 W cm −2 for the cell assembled from phosphoric acid-doped pristine polybenzimidazole membrane.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Xintong Wang,Jiang Yang,Xu Chen,Wei Ding
The inhibition properties of 2-mercaptobenzimidazole (MBI) and its synergism with oleic imidazoline (OIM) for carbon steel in CO 2 -saturated brine solution were investigated by electrochemical, weight loss measurements, surface analysis and quantum chemical calculations. The effectiveness of MBI for OIM was also compared to the other sulfur-containing corrosion inhibitors such as 2-mercaptothanol (ME), mercaptoacetic acid (TGA), and thiourea (TU). The results show that a mixture of MBI and OIM gave a better synergistic corrosion inhibition than that of ME, TGA, and TU. OIM is protonated and coupled with MBI by hydrogen bonding to co-adsorb on the carbon steel surface. MBI adsorbs on Fe by a bidentate binding N S bridge connection, which effectively prevents the carbon steel from CO 2 corrosion.
研究领域:
材料科学
·
电化学
·
表面化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yong Han,Xie He,Weixia Yang,Xueli Luo,Ying Yu,Wenzhi Tang,Tianli Yue,Zhonghong Li
A ratiometric fluorescent sensor was facilely fabricated using innate fluorescence of carbendazim (MBC) and fluorescent UiO-67 to sensitively and selectively detect MBC in food matrixes. The innate fluorescence of MBC provided a signal at 311 nm (F 311 ), and the fluorescent UiO-67 at 408 nm (F 408 ) could recognize MBC through π-π stacking inducing fluorescent quenching relied on photoelectron transfer (PET). The ratio (F 311 /F 408 ) of the fluorescence enhancement of MBC and the quenching of UiO-67 linearly responded to the MBC concentrations of 0–47.6 μmol/L with a low limit of detection (LOD) of 3.0 × 10 −3 μmol/L. The reverse response signals of the sensor enhanced the sensitivity toward MBC and presented remarkable anti-interference capability in complex matrices. The as-prepared sensor was applied to detect MBC residues in apple, cucumber and cabbage, obtaining satisfactory accuracy and precision with the recovery of 90.82–103.45% and RSDs of lower than 3.03%.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2016
·Vol. 21
·期 11
·1574
·
IF 2.465
Xing Wang,Yong-Fei Chen,Wei Yan,Ling-Ling Cao,Yong-Hao Ye
A series of benzimidazole phenylhydrazone derivatives (6a–6ai) were synthesized and characterized by1H-NMR, ESI-MS, and elemental analysis. The structure of6bwas further confirmed by single crystal X-ray diffraction as (E)-configuration. All the compounds were screened for antifungal activity againstRhizoctonia solaniandMagnaporthe oryzaeemploying a mycelium growth rate method. Compound6fexhibited significant inhibitory activity againstR. solaniandM. oryzaewith the EC50values of 1.20 and 1.85 μg/mL, respectively. In vivo testing demonstrated that6fcould effectively control the development of rice sheath blight (RSB) and rice blast (RB) caused by the above two phytopathogens. This work indicated that the compound6fwith a benzimidazole phenylhydrazone scaffold could be considered as a leading structure for the development of novel fungicides.Keywords:benzimidazole;phenylhydrazone;antifungal activity
研究领域:
植物病理学
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Bin Chen,Hegang Shu,Yujun Guo,Yingjie Xu
In this work, the effect of the structure and substitution of azole-based anion on the CO 2 capture and viscosity ( η ) of metal chelate-based dual functional ionic liquids (DFILs) with [K(DGA) 2 ] + cation was investigated. The CO 2 absorption capacity of DFILs at 0.1 MPa and 333.2 K shows that methyl and nitro groups on the azole-based anion, such as pyrazolide ([Pyr] − ) and imidazolide ([Im] − ), attenuate their reactivity with CO 2 through the steric hindrance and electron-withdrawing effects, respectively. Furthermore, the CO 2 absorption capacity of [K(DGA) 2 ][Pyr] is larger than that of [K(DGA) 2 ][Im], which is due to the interaction of the two adjacent N atoms in the [Pyr] − anion with CO 2 , as confirmed by DFT calculations. The CO 2 absorption mechanism shows that both [Pyr] − anion and [K(DGA) 2 ] + cation of [K(DGA) 2 ][Pyr] can chemically interact with CO 2 , making its saturated uptake at 333.2 K as high as 1.47 mol CO 2 per mole IL. Moreover, CO 2 interacts preferentially with [Pyr] − , and the [K(DGA) 2 ] + –CO 2 interaction is enhanced when the CO 2 uptake is greater than 0.5 mol CO 2 per mole IL. η of pure [K(DGA) 2 ][Pyr] is lower than that of pure [K(DGA) 2 ][Im]. η of [K(DGA) 2 ][Pyr] increases with the increase of CO 2 absorption, and the rapid increase in η after CO 2 uptake greater than 0.5 is attributed to the formation of [K(DGA) 2 ] + –CO 2 interactions.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）