Optical Materials Express
·
2018
·Vol. 8
·期 8
·2089-2102
·
IF 2.566
Jian Cui,Xusheng Xiao,Yantao Xu,Xiaoxia Cui,Meiling Chen,Junjiang Guo,Min Lu,Bo Peng,Haitao Guo
For developing an ideal efficient and low-threshold medium for fiber lasers operated at 4 μm wavebands, 0.05 wt.% to 0.5 wt.% Dy3+ ions doped Ga0.8As39.2S60 chalcogenide glasses were investigated and a 4.2 μm fiber laser was theoretically studied based on the rate and propagation equations. It was shown that the Ga0.8As39.2S60 glass shows a desirable large Dy3+ ion solubility, which has been increased by an order of magnitude compared to As2S3 glass. Dy-rich nanocrystallines were found when the Dy3+ ions’ concentration is more than 0.3wt.% (i.e. 3000 ppmw), and the concentration quenching was found based on spectral analysis; however, no rapid decreases in lifetimes were observed. 0.3wt.% Dy3+ doped Ga0.8As39.2S60 glass possesses relatively large laser quality factor σemi × τmea = 1.70 × 10−23 cm2·s and excellent thermal stability (ΔT = 182°C), which can be successfully drawn into fibers indicating good potential for mid-infrared fiber laser.
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CHIRALITY
·
2018
·Vol. 30
·期 12
·1277-1286
·
IF 1.833
Lu-Ning Sun,Yi-Wen Shen,Yu-Wen Ying,Duo Li,Teng-Fei Li,Xue-Hui Zhang,Ping Zhao,Li Ding,Yong-Qing Wang
Rabeprazole is an effective proton pump inhibitor to treat acid-related diseases. To achieve the simultaneous determination of rabeprazole enantiomers in human plasma, a chiral LC-MS/MS method was developed and validated. Acetonitrile including 0.1% ammonium were used as protein precipitating agent. Analytes were separated within 8 minutes on a Chiralpak IC column (4.6 mm × 150 mm, 5 μm). The mobile phase was 10 mM ammonium acetate including 0.2% acetic acid-acetonitrile (35:65, v/v). An API 4000 mass spectrometer was used as detector for the analysis, and the multiple reactions monitoring transitions of m/z 360.1 → 242.2 and 346.1 → 198.1 were opted for quantifying rabeprazole enantiomers and internal standard. Matrix effects were not apparent for each enantiomer and internal standard (esomeprazole), the calibration curves were linear over the concentration of 0.500 to 400 ng·mL −1 , the intra-run precisions were below 5.4%, the inter-run precisions were below 9.9%, and the accuracy was between −9.2% and 9.3%. There was no chiral inversion observed during sample storage, preparation procedure, and analysis, demonstrating that analytes were stable in this study. This method was applied to the stereoselective pharmacokinetic study of (R)-(+)- and (S)-(−)-rabeprazole after oral administration of 10-mg rabeprazole sodium enteric-coated tablet in healthy Chinese subjects.
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Nanoscale
·
2018
·Vol. 10
·期 46
·22012-22024
·
IF 7.233
Qian He,Shuolin Li,Shaowei Huang,Longqiang Xiao,Linxi Hou
The development of highly efficient electrocatalysts has attracted increasing attention in the field of electrochemical energy conversion. Therefore, we report a simple self-template method to construct Co–Sn–X (X = S, Se, Te) nanocages through the anion exchange reaction of CoSn(OH)6 nanocubes with chalcogenide ions under mild solvothermal conditions. Benefiting from advantageous compositional features and well-designed architectures, the obtained Co–Sn–X (X = S, Se, Te) nanocages display enhanced electrocatalytic activity for dye-sensitized solar cells (DSSCs) and the oxygen evolution reaction (OER) in an alkaline electrolyte. Remarkably, the Co–Sn–Se nanocages as the counter electrode (CE) catalyst deliver a prominent power conversion efficiency (PCE) of 9.25% for DSSCs compared with Pt CE (8.19%). Furthermore, when used as an OER catalyst, the Co–Sn–Se nanocages also exhibit outstanding electrocatalytic activity in terms of their low overpotential of 304 mV at the current density of 10 mA cm−2 and long-term stability in 1.0 M KOH solution. This work provides wide prospects for the rational design and synthesis of high-performance transition metal chalcogenide-based electrocatalysts for future energy conversion systems.
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Polymers
·
2019
·Vol. 11
·期 5
·803
·
IF 3.164
Feng Bao,Fengfeng Zhang,Chenghao Wang,Yuanyuan Song,Nan Li,Jinyan Wang,Xigao Jian
The application of poly(phthalazinone ether ketone)s (PPEKs) resin containing phthalazinone moiety is limited, due to its poor thermoforming processability. To investigate the effects of the phthalazinone’s side-group on the thermal stability and processability of the resin, a series of PPEKs resins with different side-group (–H/–CH3/–Ph) were prepared by nucleophilic aromatic substitution polymerization. The properties of the obtained resins were investigated by differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), dynamic thermomechanical analysis (DMA), and rheogoniometer. The results show that the introduction of methyl or phenyl into the PPEKs resin, significantly reduced the melting viscosity of the resin, but resulted in a slight decrease in the thermal stability of it. This might be due to the presence of methyl or phenyl, which enhanced the free volume of the molecule and reduced the entanglement between the chains; the results of the computer simulation confirmed it. Moreover, the resin films displayed excellent tensile strength with the introduction of methyl or phenyl. In a word, a novel poly(phthalazinone ether ketone)s resin with thermal resistance, easy processing and excellent mechanical properties could be obtained by introducing appropriate bulk-rigid side-groups into the phthalazinone moiety.Keywords:phthalazinone;side-group;thermal properties;processability
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ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yanan Zhao,Shiying Zou,Danqun Huo,Changjun Hou,Mei Yang,Junjie Li,Minghong Bian
Reliable and simple detection methods for chemotherapeutic agent contaminants, such as methotrexate , are required to minimize their possible toxic threat. However, detecting them remains a challenging in environmental and biological analysis. Here, we developed a fluorescent N, S co-doped carbon quantum dots (N, S co-doped CQDs) probe to detect methotrexate on the basis of the inner filter effect of fluorescence. Under optimized conditions, the fluorescent probe exhibits high sensitivity and specific selectivity with a linear detection range from 0.4 μg/mL to 41.3 μg/mL and a low detection limit of 12 ng/mL (S/N = 3). Further, this N, S co-doped CQDs fluorescent probe can be used to analyze extracellular fluids and wastewater samples satisfactorily, thereby showing a remarkable potential for broad applications in biological molecule determination and environmental analysis .
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高影响因子
MOLECULAR NUTRITION & FOOD RESEARCH
·
2018
·Vol. 62
·期 24
·1800728
·
IF 5.151
Chun-Feng Guo,Shuang Zhang,Ya-Hong Yuan,Jing-Yan Li,Tian-Li Yue
Scope Lactobacillus casei F0822-fermented milk has exhibited significant hypocholesterolemic activity in hamsters in the previous study. Under this premise, the objective of this study is to further explore whether bile salt hydrolase (BSH) and S-layer protein (SLP) of the strain have a significant influence on hypocholesterolemic activity of the fermented milk. Methods and results Independent and double interposon mutants of BSH and SLP genes are constructed from wild-type L. casei F0822 via chromosomal insertion of chloramphenicol or/and erythromycin resistance genes based on double-crossover homologous recombination. The mutants- and the wild-type strain-fermented milk is prepared (viable counts of approximately 8.0 × 10 8 colony-forming units mL –1 each) and intragastrically administered to high-cholesterol-fed hamsters once daily at a dose of 1.25 mL d –1 for 28 d, respectively. Both the BSH-deficient mutant- and the SLP-deficient mutant-fermented milk significantly ( p < 0.05) increase serum total and LDL-cholesterol levels in hamsters compared with the wild-type strain-fermented milk. However, only the BSH-deficient mutant-fermented milk could significantly ( p < 0.05) increase hepatic total and esterified cholesterol levels in hamsters. Conclusion Both BSH and SLP have a significant influence on the hypocholesterolemic activity of L. casei F0822-fermented milk in hamsters. Nevertheless, the BSH is greater than the SLP in this regard.
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Polymer Chemistry
·
2018
·Vol. 9
·期 40
·4984-4993
·
IF 4.927
Chenyi Wang,Yuanpeng Zhou,Bin Shen,Xiaoyan Zhao,Jian Li,Qiang Ren
Aromatic sulfonated polymers are a class of important proton exchange membranes. With the aim of further enhancing their properties at low levels of ion-exchange capacity (IEC), a class of new poly(ether sulfone ketone)s containing multiple sulfonic acids on the side chains of the sulfonated structural units (sPh-PESK-xx) were designed and prepared by a convenient and mild post-sulfonation reaction process. The structures of the related monomer and copolymers were confirmed by IR and NMR analysis. The resulting membranes from solution casting of these aromatic sulfonated polymers showed overall good performance at low IEC levels. Their proton conductivities were in the range of 110–154 mS cm−1, while their swelling ratios were in the range of 6.2%–16.1% at 80 °C. Meanwhile, they also displayed good thermal and chemical oxidative stabilities. The results confirmed that the incorporation of a high density of pendant sulfonic groups is an effective way to improve the performance of aromatic sulfonated polymers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Mengjie Pu,Yongwen Ma,Jinquan Wan,Yan Wang,Mingzhi Huang,Yangmei Chen
Fe/S doped granular activated carbon (Fe/SGAC) was synthesized with ferric nitrate, Na 2 S 2 O 3 and (NH 4 ) 2 S 2 O 8 via an impregnation–precipitation, reduction–oxidation combining with aqueous-phase synthesis method treatment. Surface density of functional groups, surface area changes as well as the chemical state inside Fe/SGAC catalyst were studied by Boehm titration, N 2 adsorption and X-ray photoelectron spectroscopy (XPS). The reactivity of the catalysts was tested by degrading Orange G (OG) and diethyl phthalate (DEP). The Fe/SGAC catalysts could significantly enhance the removal rate of OG as compared to persulfate alone and PS/GAC. And the catalytic capacity was also enhanced by S doping. But the degradation of DEP under the similar condition was inhibited by adsorption process because of the different hydrophobicities of OG and DEP molecule. Fe 2 O 3 /FeOOH (Fe 3+ ) (represents ferrihydrite) together with FeO/Fe 3 O 4 (Fe 2+ ) and Fe 2 O 3 -satellite, which provide the new active site for persulfate catalyst was found to be the major components of iron element in Fe/SGAC catalyst; the existence of FeS 2 (S − ) for sulfur element verified the assumption that the doped S element promoted the electron transfer between the persulfate species and iron oxide at the interface. COD removal experiment further confirmed that mostly contaminant removal was owed to the Fe/SGAC catalytic persulfate oxidation process.
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BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Weiping Wang,Ya-Chun Lu,Hong Huang,Ai-Jun Wang,Jian-Rong Chen,Jiu-Ju Feng
In this report, N, S-codoped fluorescent carbon nanodots (NSCDs) were prepared by a facile, simple, low-cost, and green thermal treatment of ammonium persulfate , glucose, and ethylenediamine . The as-prepared NSCDs displayed bright blue emission with a relatively high fluorescent quantum yield of 21.6%, good water solubility, uniform morphology, and excellent chemical stability, compared to pure CDs. The fluorescence of NSCDs can be significantly quenched by methotrexate (MTX) via fluorescence resonance energy transfer (FRET) between NSCDs and MTX, which was used for highly selective and sensitive detection of MTX with a wide linear range up to 50.0 μM and a low detection limit of 0.33 nM ( S / N =3). Moreover, this method was explored for practical detection of MTX in human serum with satisfied results.
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RSC Advances
·
2015
·Vol. 5
·期 112
·92017-92024
·
IF 3.84
Wei Luo,Ran Xu,Yunfei Liu,Irshad Hussain,Qunwei Lu,Bien Tan
The key challenge in the formation of stable CO2-in-water (C/W) emulsions has always been the availability of effective surfactants. Most of the surfactants being used for this purpose are expensive and difficult to synthesize, rendering the formation of C/W emulsions an uneconomical and unfavorable process. In this work, we report the use of commercial polyvinyl alcohol as an effective stabilizer for the formation of C/W emulsions at low temperatures. Porous emulsion-templated materials were prepared by the polymerization of the continuous phase of C/W emulsions. The open-cell morphology of the emulsion-templated materials was observed by scanning electron microscopy. To tune the morphology of the porous structures, the influence of the stabilizer concentration and the process of polymerization were investigated. These porous PAM materials were further evaluated for cellular growth and proliferation to demonstrate their applications in tissue engineering.
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GREEN CHEMISTRY
·
2014
·Vol. 16
·期 6
·3007-3012
·
IF 6.852
Chao Shen,Jun Xu,Wenbo Yu,Pengfei Zhang
Aryl sulfones were synthesized using a highly active and easily recoverable heterogeneous Cu catalyst which was prepared by simply stirring an aqueous suspension of chitosan in water with copper salts. The chitosan@copper catalyst catalyzed the coupling reactions of aryl halides with sodium sulfinates to readily give the corresponding sulfones in good to excellent yields. The highly active catalyst can be reused many times without losing its catalytic activity. In addition, by using this protocol, the marketed drug zolimidine (antiulcer) could be synthesized easily.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 2
·1878-1881
·
IF 3.086
Yong Cui,Zhe Zhang,Xu Du,Wei Liu,Yulin Deng,Shi Liu,Gang Wang
CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films were obtained via a solution process based on homogeneous precursor solutions and selenization. The as-prepared thin films were characterized by XRD, EDS and SEM. The CdS buffer layer was deposited by a solution process on the CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films, and Mo/CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co)/CdS/i-ZnO/ITO/Al thin-film solar cells were fabricated. The efficiencies of the as-fabricated CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin-film solar cells were 4.33%, 2.38% and 1.98%, respectively.
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