International Journal of Minerals Metallurgy and Materials
·
2018
·Vol. 25
·期 3
·310-314
·
IF 1.261
Li Shi-na,Ma Rui-xin,Wang Cheng-yan
The Cu 2 MoS 4 nanoparticles were prepared using a relatively simple and convenient solid-phase process, which was applied for the first time. The crystalline structure, morphology, and optical properties of Cu 2 MoS 4 nanoparticles were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and UV-vis spectrophotometry. Cu 2 MoS 4 nanoparticles having a band gap of 1.66 eV exhibits good photocatalytic activity in the degradation of methylene blue, which indicates that this simple process may be critical to facilitate the cheap production of photocatalysts.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wen Yilin,Yuan Jianyong,Chen Jun,Zhao Yilin,Niu Yazhen,Yu Chao
This research describes a nanowire network-based method for detecting the activity of myeloperoxidase (MPO), a biomarker of acute coronary syndromes (ACS). Trimetallic CuPdPt nanowire networks (CuPdPt NWNWs) were prepared by a one-step chemical reduction method. The metallic precursors quickly form nanowire network structures without the need for additional capping agents or surfactants. This process creates a product with a clean surface. The NWNWs were dropped onto a glassy carbon electrode (GCE) to obtain a sensor with good catalytic activity towards the reduction of hydrogen peroxide (H 2 O 2 ), which was used as an electrochemical probe working at −0.4 V (vs. SCE). It also provided a large surface for further modification. Next, an antibody against MPO was immobilized on the modified GCE via the stable conjunction between Cu, Pt, Pd and amino groups. Upon binding of MPO to the antibody on the GCE, the current response to H 2 O 2 was reduced by 35 μA·cm −2 . The immunosensor had a linear response within the 100 fg·mL −1 to 50 ng·mL −1 MPO concentration range and a 33 fg·mL −1 detection limit (at an S/N ratio of 3). The recovery of spiked serum samples ranged from 99.8 to 103.6%. This result suggests that the method can be applied to the quantitation of MPO in human serum samples.
A trimetallic CuPdPt nanowire networks was placed on a glassy cabon electrode (GCE) to design an immunosensor for myeloperoxidase (MPO), a biomarker for the acute coronary syndrome (ACS). Antibody against MPO was immobilized on the network via conjugation between Cu, Pt, Pd and amino groups. Amperometric i-t measurements were conducted to quantify the amount of MPO that binds to the antibody on the surface of the modified GCE.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22455-22463
·
IF 2.8
Wang Pingping,Dong Faqin,Liu Mingxue,He Huichao,Huo Tingting,Zhou Lei,Zhang Wei
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-Fe 2 O 3 /TiO 2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-Fe 2 O 3 and TiO 2 electrodes, the composite α-Fe 2 O 3 /TiO 2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-Fe 2 O 3 /TiO 2 electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5391-5400
·
IF 2.324
Zeng Ming,Pang Tao,Chen Jiangbing,Huang Yiwan,Xu Qingyu,Gu Yi
The novel star shaped benzoxazine-co-urethane prepolymers are first synthesized from the natural resource castor oil, hydroxyl terminated benzoxazine and diisocyanate through the facile one-pot formulation method. Then the cured benzoxazine copolymers can be obtained by the ring-opening polymerization of oxazine groups of the prepared prepolymers. Both hexamethylene diisocyanate and 4,4′-methylenediphenyl diisocyanate are employed as aliphatic and aromatic diisocyanate, respectively, to clarify their effects on the chemical structure and high-frequency dielectric properties of copolymers. In comparison with the pure polybenzoxazine, the copolymer films occupy the improved high-frequency dielectric properties owing to the introduction of three branching aliphatic castor oil, leading to the reduction of molecular polarity and the improvement of free volume. It should be noted that the aliphatic diisocyanate not only decreases the polarity of the copolymer, but also enhances the intermolecular interaction and intermolecular entanglement between castor oil and benzoxazine for the copolymers. Accordingly, the aliphatic diisocyanate based poly(benzoxazine-co-urethane) occupies the minimum high-frequency dielectric constants (2.94, 5 GHz; 2.96, 10 GHz) and relatively high glass transition temperature (220 °C). Therefore, this work not only provides a simple path for improving high-frequency dielectric properties of benzoxazine, but also gives some insight into the effects of diisocyanates on the formation and high-frequency dielectric properties of poly(benzoxazine-co-urethane)s.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5287-5292
·
IF 2.324
Cao Renping,Quan Guanjun,Shi Zhihui,Gou Qingdong,Chen Ting,Hu Zuofu,Luo Zhiyang
Novel LiBaPO 4 :Bi 3+ yellow-emitting phosphor is synthesized by high temperature solid-state reaction method in air. With excitation 260 nm, LiBaPO 4 :Bi 3+ phosphor emits yellow light with the chromaticity coordinate (0.4272, 0.4657) and color rendering index 77.7. Emission band peaking at ~ 588 nm of LiBaPO 4 :Bi 3+ phosphor in the range of 400–790 nm is attributed to the 3 P 1 → 1 S 0 electron transition of Bi 3+ ion. Excitation band monitored at 588 nm in the range of 220–300 nm is assigned to the 1 S 0 → 3 P 1 electron transition of Bi 3+ ion. The optimal Bi 3+ ion concentration in LiBaPO 4 :Bi 3+ phosphor is ~ 1.0 mol%. Time resolved spectra and fluorescence lifetime data confirm that there is only Bi 3+ ion luminous center in LiBaPO 4 :Bi 3+ phosphor. The luminous mechanism is analyzed by configurational coordinate diagram of Bi 3+ ion. The experiment results are helpful to develop other new Bi 3+ -doped optical materials for solid-state lighting.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 12
·2278-2286
·
IF 1.113
Zhan Yi-zhen,Zhao Xue,Wang Wei
Three azo dyes had been synthesized using N-propyl substituted, dibromo-substituted and dicyano-substituted phthalimides as diazo components. All of the synthesized intermediates and dyes have been characterized by MS, 1H-NMR and IR analyses. The dyeing behaviour and fastness properties of these dyes had been investigated. The absorption maxima of the dyes were observed in the range 360 to 700 nm. The results indicated that dyes caused hypsochromism effect after -Br substitution and dyes caused bathochromism effect after -CN substitution. IR spectra of hydrolyzed dye showed that C=O groups appeared under relatively mild alkaline conditions. Compared with electron density, steric hindrance effect is an more important influence factor than electron density in hydrolysis reaction process. Exhaustion of dyed polyester/elastane fabrics decreased obviously as the pH value increased. In order to ensure dyeing levelness, heating rate of prepared dyes will be strictly controlled. Due to alkali-clearable property and interaction energy of dye-fiber and dye-dye, the dyes have good colorfastness.
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JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2018
·
IF 2.869
Bing Xia,Yuanji Gao,Baocheng Ji,Fengwei Ma,Lisheng Ding,Yan Zhou
Electrospray ionization mass spectrometry (ESI-MS) technique has limitations in analysis of compounds that are dissolved in nonpolar solvents. In this study, ambient ionization of compounds in solvents that are not “friendly” to electrospray ionization, such as n-hexane, is achieved by conductive nanomaterials spray ionization (CNMSI) on nanomaterial emitters, including carbon nanotubes paper and mesodendritic silver covered metal, which applies high voltages to emitters made of these materials without the assistance of polar solvents. Although the time intensity curves (TIC) commonly vary from 4.5% to 23.7% over analyses, protonated molecular ions were found to be the most abundant species, demonstrating good reproducibility of the technique in terms of ionized species. Higher mass spectrometric responses are observed in analyzing nonpolar systems than polar systems. 2-Methoxyacetophenone, 4-methylacetophenone, benzothiazole, quinolone, and cycloheptanone as low as 2 pg in n-hexane can be directly detected using the developed method. The developed technique expands the analysis capability of ESI-MS for direct, online analysis of nonpolar systems, such as low polarity extracts, normal phase liquid chromatography eluates, and synthetic mixtures.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2018
·Vol. 26
·期 7
·2945-2953
·
IF 1.971
Chen Huayao,Lin Guanquan,Zhou Hongjun,Zhou Xinhua,Xu Hua,Huang Suqing
Avermectin (AVM) is a highly efficient pesticide against a variety of insects and is widely used in agriculture. However, it is susceptible to oxidation and photolysis, resulting in instability under UV irradiation and a short half-life. Herein, sodium carboxymethyl cellulose (CMC) was grafted by styrene (St), Methyl methacrylate (MMA) and butyl acrylate (BA) respectively to prepare grafted polymer nanoparticles in application for AVM sustained released. And the influence of different grafted monomer and the grafted rate on the AVM/grafted polymer nanoparticles performance was discussed. The larger the grafted rate of St was, the larger the particle size of AVM/grafted polymer nanoparticles had with a higher drug loading rate and stronger resistance to ultraviolet light. Besides, the particle size, drug loading rate and the ability of anti-ultraviolet light of grafted CMC emulsion was also influenced by the modifying agent. While the concentration of AVM was kept the same, the acrylic esters (MMA and BA) grafted emulsion have smaller particle sizes with higher drug loading rates and stronger anti-ultraviolet ability comparing to styrene (St) grafted emulsion. The effect of different amount of St and different monomer grafted on the sustained release performance of AVM/grafted polymer was also investigated. As the grafted rate of St increased, the release rate became smaller. The release speed has a sequence of CMC-g-PBA > CMC-g-PS > CMC-g-PMMA when CMC grafted with different monomer. Their sustained release curves can be described by Korsmeyer-Peppas equation. Finally, the insect toxicity test showed that insecticide toxicity against diamondback moth ( Plutella xylostella L.) has no apparent difference among the AVM and AVM/grafted polymer nanoparticles indicating that AVM/grafted polymer nanoparticles can reduce the amount of organic solution used for dissolution and prolonged its service life without decreasing its insecticide toxicity.
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TRANSITION METAL CHEMISTRY
·
2018
·Vol. 43
·期 2
·149-159
·
IF 1.261
Chen Jincan,Zhang Yao,Li Baojun,Li Guodong,Jie Xinming,Cui Ying,Zou Zhilin,Huang Xiaofeng,Qu Jiaoyue,Chen Lanmei
Two ruthenium complexes [Ru(MeIm) 4 (bpy)] 2+ ( Ru1 , MeIm = 1-methylimidazole, bpy = 2,2′-bipyridine) and [Ru(Im) 4 (bpy)] 2+ ( Ru2 , Im = imidazole) with the same PF
− 6
counter-ion but different lipophilicities were synthesized and characterized and as potent anticancer agents. The relationships between cellular uptake, localization and molecular action mechanisms of these complexes were elucidated. The results showed that Ru1 with higher log P o/w exhibited faster cellular uptake rates, but lower anticancer activity than Ru2 . In addition, Ru1 predominantly accumulated in the mitochondria and cytoplasm, and induced G0/G1 cell cycle arrest, whereas the more hydrophilic Ru2 tended to localize and accumulate in the cell nucleus and mitochondria. Further mechanism studies indicated that Ru2 caused cell cycle arrest at S phase by regulating cell cycle related proteins and induced apoptosis in A549 cells through DNA damage, cellular ROS accumulation, activation of the caspase pathway and mitochondrial dysfunction.
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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2018
·Vol. 71
·期 5
·1113-1126
·
IF 0.91
Chen Jin-ping,Zhang Xue-song
Four hydrosoluble macroazacyclic compounds, phosphorus phthalocyanine and substituent phosphorus triaza tetrabenzo corrole substituted with amino or sulfonate groups respectively, were investigated as corrosion inhibitors for mild steel in 1 mol/L HCl. The results obtained from weight loss test showed that the inhibitive efficiency of phosphorus phthalocyanine was higher than the phosphorus triaza tetrabenzo corrole; while the amino substituent phosphorus phthalocyanine showed the strongest inhibitive ability among them. The potentiodynamic tests illustrated that these inhibitors protected steel according to the mixed type mechanism on electrochemistry; while the impedance spectra revealed the increasing of charge transfer resistance and the decreasing of double layer capacitor caused by the adsorption of inhibitors. The surface analysis (XPS and SEM) proved the protection of steel surface by the adsorbed inhibitors. The molecular dynamic simulation indicated the advantages of phosphorus phthalocyanine as inhibitors associating with highly binding stability and stable adsorption configuration. The unique degradation properties of these inhibitors under visible light made them useful with environmental advantage in application.
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PHARMACEUTICAL RESEARCH
·
2018
·Vol. 35
·期 1
·1-15
·
IF 3.335
Jin Ya,Wu Zimei,Li Caibin,Zhou Weisai,Shaw John P.,Baguley Bruce C.,Liu Jianping,Zhang Wenli
Purpose To enhance therapeutic efficacy and prevent phlebitis caused by Asulacrine (ASL) precipitation post intravenous injection, ASL-loaded hybrid micelles with size below 40 nm were developed to improve drug retention and tumor penetration. Methods ASL-micelles were prepared using different weight ratios of 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-polyethyleneglycol-2000 (DSPE-PEG 2000 ) and D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) polymers. Stability of micelles was optimized in terms of critical micelle concentration (CMC) and drug release properties. The encapsulation efficiency (EE) and drug loading were determined using an established dialysis-mathematic fitting method. Multicellular spheroids (MCTS) penetration and cytotoxicity were investigated on MCF-7 cell line. Pharmacokinetics of ASL-micelles was evaluated in rats with ASL-solution as control. Results The ASL-micelles prepared with DSPE-PEG 2000 and TPGS (1:1, w /w) exhibited small size (~18.5 nm), higher EE (~94.12%), better sustained in vitro drug release with lower CMC which may be ascribed to the interaction between drug and carriers. Compared to free ASL, ASL-micelles showed better MCTS penetration capacity and more potent cytotoxicity. Pharmacokinetic studies demonstrated that the half-life and AUC values of ASL-micelles were approximately 1.37-fold and 3.49-fold greater than that of free ASL. Conclusions The optimized DSPE-PEG 2000 /TPGS micelles could serve as a promising vehicle to improve drug retention and penetration in tumor.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 21
·1-13
·
IF 2.8
Su Congxue,Tao Wenlong,Chen Lianchun,Che Haiyan,Wang Ruijuan,Fan Jun,Qin Xingliu,Chen Zhilin,Fang Liang
Orthorhombic olivine-structured LiTmRO 4 (R = Si, Ge) ceramics were synthesized using a solid-state reaction. Promising microwave dielectric properties of ε r = 8.18, τ f = 13.7 ppm/°C and a high-quality factor ( Q × f ) of 24,274 GHz for LiTmSiO 4 were obtained at 1130 °C, and ε r = 8.67, τ f = − 24.4 ppm/°C and Q × f = 19,231 GHz for LiTmGeO 4 were achieved at 1090 °C. According to the bond valence results, Tm 3+ and Ge 4+ presented a compressed state, but Li + exhibited a strong rattling state in LiTmGeO 4 , which led to a higher ε r than ε theo . The integrated effect of the rattling cations (Li + and Si 4+ ) and a compressed cation (Tm 3+ ) in LiTmSiO 4 resulted in a smaller positive deviation ∆ ε r . The larger packing fraction of LiTmSiO 4 contributed to a higher Q × f than that of LiTmGeO 4 . The R–O bond in both ceramics played a leading role in influencing Q × f according to the Phillips–Van Vechten–Levine chemical bond theory.
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