Journal of Energy Chemistry
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2015
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IF 2.352
Feifei Sun,Yue An,Lecheng Lei,Fuying Wu,Jingke Zhu,Xingwang Zhang
Hydrogenation of carbazole and N-ethylcarbazole over Raney-Ni catalyst were realized in the temperature range of 393–503 K. 4[H] adduct dominated the hydrogenation products and the formation of 2[H] adduct was the rate-limiting step during the period, in which the conversion of carbazole was less than 40%. The hydrogenation process followed pseudo-first-order kinetics and the hydrogenation activation energies of carbazole and N-ethylcarbazole were 90 kJ/mol and 115 kJ/mol, respectively. The reaction starting position as well as the pathway of the hydrogenation of (N-ethyl)carbazole were investigated by comparing the kinetic characteristics of hydrogen uptake of carbazole and N-ethylcarbazole. The results showed that the reaction was a stepwise hydrogenation process and the first H 2 was added to the C1 = C10 double bond in the hydrogenation.
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高影响因子
FUEL
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2015
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IF 3.52
Xiaojie Wang,Xiaopo Wang,Jianlin Chen
The main components of biodiesel are fatty acid methyl esters (FAMEs) or fatty acid ethyl esters (FAEEs). N -hexadecane is commonly used as a reference molecule for modeling diesel fuel thermodynamics properties. In this paper, densities and dynamic viscosities of binary mixtures of n -hexadecane with three fatty acid methyl esters (methyl caprate, methyl laurate, and methyl myristate) were measured at atmospheric pressure from 298.15 to 323.15 K over the entire composition range. Excess molar volumes and viscosity deviations of the mixtures were calculated from the experimental data and correlated using the Redlich–Kister equation.
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高影响因子
CLINICAL NUTRITION
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2014
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IF 3.94
Lulu Xia,Chaonan Fan,Hua Dong,Cui Wang,Yuanyuan Lu,Richard J. Deckelbaum,Kemin Qi
Summary Background & aims The catabolic pathways of n-3 triglyceride (TG) rich particles (n-3 TGRP) have not been clearly elucidated. In this study, we investigated the effects of lipoprotein lipase (LPL) on the catabolism of n-3 TGRP compared to n-6 TGRP in vivo and in vitro, and we determined whether particle size affects the biological functions of LPL in n-3 TGRP catabolism. Methods Four types of lipid emulsions , chylomicron (CM)-sized n-3 TG and n-6 TG emulsions, and very low density lipoprotein (VLDL)-sized n-3 TG and n-6 TG emulsions, were labeled with 1,1′-dioctadecy1-3,3,3′,3′-tetramethylindo-carbocyanine perchlorate (DiI) and administered via a bolus injection to LPL gene knockout (LPL+/−) mice in vivo and were added to cultured LPL miRNA-transfected 3T3-L1 adipocytes in vitro. Results With CM-sized emulsions, a reduction in LPL expression in LPL+/− mice had almost no effect on tissue uptake of n-3 TG emulsions with smaller changes in their initial blood clearance ; however, greater effects were observed for VLDL-sized n-3 TG emulsions with respect to tissue uptake with greater changes in their initial blood clearance, compared to n-6 TG emulsions with the same size. In vitro, LPL miRNA transfection had smaller effects on CM-sized and greater effects on VLDL-sized n-3 TG emulsions, with respect to particle uptake, cell TG mass, particle-cell binding and particle lipolysis . Conclusion These results suggested that LPL is more important for catabolism of n-3 TGRP of smaller size; whereas it is essential for catabolism of all sizes of n-6 TGRP.
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PubMed
高影响因子
THERMOCHIMICA ACTA
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2014
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IF 2.105
Zhenjin Fu,Lin Su,Jing Li,Ruizhuang Yang,Zhanwen Zhang,Meifang Liu,Jie Li,Bo Li
The elastic silicone/ n -hexadecyl bromide microcapsules were prepared as novel microencapsulated phase change materials by microfluidic approach with the co-flowing channels, where the double oil1-in-oil2-in-water (O1/O2/W) droplets with a core–shell geometry were fabricated. The thermal characterizations of the microcapsules were investigated using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA). The DSC results showed that the microcapsules had good energy storage capacity with melting and freezing enthalpies 76.35 J g −1 and 78.67 J g −1 , respectively. The TGA investigation showed that the microcapsules had good thermal stability. The surfaces of microcapsules were smooth and the cross sections were compact from the results of optical microscope and scanning electron microscopy (SEM). Optical microscope showed that the silicone shell can provide expansion place due to its elastic property. Therefore, the silicone/ n -hexadecyl bromide microcapsules showed good potential as thermal regulating textile and thermal insulation materials.
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高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Jinshe Chen,Zunbin Duan,Zhaoyang Song,Lijun Zhu,Yulu Zhou,Yuzhi Xiang,Daohong Xia
The amorphous NiP nanoparticles were synthesized and a novel amorphous NiP/Hβ catalyst was prepared successfully further. Due to the superior surface property of amorphous NiP/Hβ catalyst, it exhibited good catalytic application for n-hexane isomerization. The catalytic activity of amorphous NiP/Hβ catalyst was close to that of the prepared Pt/Hβ sample, and better than that of commercial catalyst and crystalline Ni 2 P/Hβ catalyst. What's more, the amorphous NiP/Hβ catalyst shows high resistance to different sulfur compounds and water on account of its unique surface property. The effect of loading amounts on surface property and catalytic performance was investigated, and the structure-function relationship among them was studied ulteriorly. The results demonstrate that loading amounts have effect on textural property and surface acid property, which further affect the catalytic performance. The 10 wt.% NiP/Hβ sample has appropriate pore structure and acid property with uniformly dispersed NiP nanoparticles on surface, which is helpful for providing suitable synergistic effect. The effects of reaction conditions on surface reactions and the mechanism for n-hexane isomerization were investigated further. Based on these results, the amorphous NiP/Hβ catalyst with superior surface property probably pavesa way to overcome the drawbacks of traditional noble metal catalyst, which shows good catalytic application prospects.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2017
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IF 1.753
Wenlu Pan,Yuming Zhou,Man He,Xiaohai Bu,Binbin Ding,Tingyuan Huang,Shuang Huang,Shiwei Li
Novel chiral N -propargylamide based on stigmasterol (M1, HC CCH 2 NHCOCH 2 CH 2 COO-R, R = stigmasteryl) and achiral N -propargylamide based on pivalic acid (M2) were prepared and (co)polymerized with rhodium zwitterions catalyst in CHCl 3 to afford helical polyacetylenes with moderate molecular weights (8997–26777) in good yields. The polymers were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC). Ultraviolet–visible spectroscopy (UV–Vis) and circular dichroism (CD) absorption spectra demonstrated that the as-prepared polymers could form helical structures with a preferential helicity. The formation of hydrogen bonds of poly(M1) in CHCl 3 was investigated according to the solution sate IR spectroscopic data . The single-handed helical conformation and polymerization degree of the new-typed poly( N -propargylamide)s could be controlled by the changing the feed ratio of chiral and achiral monomers . Furthermore, the infrared emissivity values (0.536–0.798) of copolymers were investigated at 8–14 μ m by the Infrared Emissometer.
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高影响因子
ANALYTICA CHIMICA ACTA
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2016
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IF 4.712
Henghui Li,Wenjie Gao,Xiaojun Feng,Bi-Feng Liu,Xin Liu
Sialic acids usually locate at the terminal of many glycan structures in either α(2,3) or α(2,6) linkage, playing different roles in various biological and pathological processes. Several linkage specific carboxyl derivatization methods have been reported to discriminate between α(2,3) and α(2,6)-linked sialic acids by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Among them, ethyl esterification was recently reported to achieve linkage specific derivatization between α(2,3) and α(2,6)-linked sialic acids with good selectivity . However, the method suffered from the instability of the generated lactones and byproducts of the derivatives. To overcome these shortcomings, a solid-phase two step derivatization method was introduced to convert the α(2,6)-linked sialic acid into ethyl esters and the α(2,3)-inked counterparts into N-methyl amides, respectively. Under the optimized derivatization conditions, our method was able to achieve accurate relative quantification of N-glycan as well as their corresponding sialylated linkage types, superior to the ethyl esterification method. The solid phase derivatization strategy was further applied to investigate N-glycans from biosimilar antibody drug and human serum from patients and healthy volunteers. This method has the potential to be used in the biomarker discovery and pharmaceutical industry .
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Xiaodong Chen,Kui Shen,Junying Chen,Binbin Huang,Danni Ding,Lei Zhang,Yingwei Li
To explore efficient non-noble metal-based electrocatalysts for oxygen reduction reaction (ORR), herein we developed a facile bottom-up approach for the fabrication of a hollow porous carbon sphere codoped with ultra-small Co nanoparticles and uniform nitrogen distribution (Co-HNCS) via one-step pyrolysis of a core-shell type precursor composing of polystyrene (PS) core and bimetallic ZIF (zeolite imidazolate framework) shell. The bimetallic Co-Zn-ZIFs (BMZIFs) was selected as the sacrifice template due to not only its high nitrogen content and regular porosity but also the superiority that Zn species in BMZIFs can both spatially separate Co species to suppress the aggregation of ultra-small Co NPs and be evaporated to afford extra pores during high-temperature pyrolysis. As expected, by adjusting the starting molar ratio of Zn to Co, we were able to prepare Co-HNCS- x ( x represent the molar ratio of Co to total starting metal feeding) that exhibited unique hollow structure with large surface areas, enhanced mass transport, high porosities, tunable particle sizes and graphitization degrees, abundant highly active CoN x sites, and thus significantly improved ORR performance. Particularly, the optimal Co-HNCS-0.2 exhibited the remarkable ORR activity (the onset and half-wave potentials were 0.94 and 0.82 V vs. RHE, respectively) via an efficient four-electron-dominant ORR process in alkaline medium, which outperformed that of commercial Pt/C (20 wt%, the onset and half-wave potentials were 0.93 and 0.80 V vs. RHE, respectively) and most of previously reported Co-based catalysts. Moreover, it also displayed much superior stability and tolerance to methanol as compared to Pt/C, further highlighting the merit of this facile synthesis approach. Our findings might inspire new thoughts on the development of precious-metal-free, highly-efficient and cost-effective ORR electrocatalysts derived from MOF.
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高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2017
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IF 3.255
Danyi Lu,Qian Xie,Baojian Wu
N -glucuronidation is an important pathway for metabolism and disposition of tertiary amines in humans. This reaction is mainly catalyzed by the enzymes UGT1A4 and UGT2B10. However, the metabolic patterns of UGT1A4- and UGT2B10-mediated N -glucuronidation are not fully clear. In this study, we first optimized in vitro reaction conditions for N -glucuronidation by using specific substrates (i.e., trifluoperazine for UGT1A4, cotinine and amitriptyline for UGT2B10). Furthermore, we found that hepatic N -glucuronidation showed significant species differences. In addition, UGT1A4 and UGT2B10 were primarily responsible for N -glucuronidation of many tertiary amines, including asenapine, loxapine, clozapine, chlorpromazine, dothiepin, doxepin, mirtazapine, mianserin, chlorcyclizine, cyclizine, promethazine, cyclobenzaprine, imatinib, retrorsine, strychnine and brucine. In conclusion, this study provides an in vitro assay system for evaluating N -glucuronidation of amines. Also, UGT1A4- and UGT2B10-mediated N -glucuronidation might play significant roles in metabolism and detoxification of tertiary amines in humans.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Guoxu Wang,Meng Liu,Juan Du,Lei Liu,Yifeng Yu,Jitong Sha,Aibing Chen
The membrane carbon materials with hierarchical porous architecture are attractive because they can provide more channels for ion transport and shorten the ions transport path. Herein, we develop a facile way based on “confined nanospace deposition” to fabricate N-dopi-ng three dimensional hierarchical porous membrane carbon material (N-THPMC) via coating the nickel nitrate, silicate oligomers and triblock copolymer P123 on the branches of commercial polyamide membrane (PAM). During high temperature treatment, the mesoporous silica layer and Ni species serve as a “confined nanospace” and catalyst respectively, which are indispensable elements for formation of carbon framework, and the gas-phase carbon precursors which derive from the decomposition of PAM are deposited into the “confined nanospace” forming carbon framework. The N-THPMC with hierarchical macro/meso/microporous structure, N-doping (2.9%) and large specific surface area (994m 2 g -1 ) well inherits the membrane morphology and hierarchical porous structure of PAM. The N-THPMC as electrode without binder exhibits a specific capacitance of 252 F g -1 at the current density of 1 A g -1 in 6 M KOH electrolyte and excellent cycling stability of 92.7% even after 5000 cycles.
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高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yuan Chen,Shanshan Jie,Congqiang Yang,Zhigang Liu
The development of highly active and efficient heterogeneous catalytic oxidation systems has become an attractive research area. In this study, nano cobalt-coordinated nitrogen-doped carbon catalysts (Co-N/C), which were prepared by the pyrolysis of cobalt porphyrin supported on carbon black precursor, were used as highly active catalysts for the oxidation of hydrocarbons with tert -butyl hydroperoxide as the oxidant. The results showed that the catalyst was efficient in the selective oxidation of a variety of saturated (including primary, secondary, and tertiary) C H bonds. The catalyst displayed the best catalytic performance, which was comparable to those for previously reported metal oxide catalysts and even better. The resultant Co-N/C catalysts were characterized in detail by XRD, nitrogen adsorption/desorption isotherms, TEM, SEM and XPS. The homogeneous distribution of the Co species and interactions between the Co-N species could improve the synergistic effect between the Co O, Co N and N C species, which led to their excellent catalytic performance. A first order kinetics was observed for the reaction with the apparent activation energy for ethylbenzene oxidation was 22.2 ± 2.1 kJ mol −1 .
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Xiaojie Wang,Xiaopo Wang,Hanxiao Lang
This work reports the density and viscosity of binary mixtures for n -hexadecane with three fatty acid ethyl esters (ethyl caprylate, ethyl caprate, and ethyl laurate) in the overall composition range at temperatures from 298.15 to 323.15 K and at atmospheric pressure (0.1 MPa). Excess molar volumes and viscosity deviations have been obtained. In addition, the viscosities of the binary mixtures were correlated using a rough hard-sphere model. The average absolute relative deviations between the experimental data and the calculated values were 0.26% for n -hexadecane/ethyl caprylate, 0.30% for n -hexadecane/ethyl caprate, and 0.24% for n -hexadecane/ethyl laurate with optimized adjustable parameters. It indicates that the rough hard-sphere model is able to reproduce the viscosity behavior of the studied binary mixtures very well.
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高影响因子
危险品化学品经营许可证（带存储）