JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2018
·Vol. 135
·期 4
·2297-2308
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IF 2.209
Chen Qinpei,Wang Xuehui,Zhou Tiannian,Ding Chao,Wang Jian
In this study, a series of ethanol–water mixture and Chinese liquor combustion experiments were conducted using an ISO5660-1 cone calorimeter and an automatic flash point tester. The main purpose was to obtain key fire parameter data, including the burning duration, mass loss rate, mass loss rate per unit area, heat release rate per unit area, CO and CO 2 volume fraction, CO 2 /CO ratio and closed-cup flash point. At the same time, the experimental differences between Chinese liquor and ethanol–water mixture were analyzed. Also, the fire risk classification was discussed based on the code of GB 50016-2014. When the ethanol volume fraction of Chinese liquor is greater than 34.8 vol%, the fire risk is the most dangerous level, Class I. While the critical ethanol volume fraction of ethanol–water mixture is 38.9 vol%, it needs to pay more attention to the fire safety of Chinese liquor storage and usage when the ethanol volume fraction is generally from 30 to 65 vol%.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 411
·期 2
·537-544
·
IF 3.307
Ran Hui,Lin Zheng-Zhong,Yao Qiu-Hong,Hong Cheng-Yi,Huang Zhi-Yong
A facile and practical ratiometric fluorescence probe based on two CdTe quantum dots (QDs) coated with molecularly imprinted polymers (MIPs) was prepared for the detection of trace malachite green (MG) in fish. Two CdTe QDs coated with MIPs were fabricated by a one-pot method using MG, (3-aminopropyl) triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) as template, functional monomer, and cross-linker, respectively. CdTe QDs with λ em 530 nm (gQDs) and 630 nm (rQDs) were used as the referential fluorophore and target sensitive fluorophore, respectively. The fluorescence intensity of gQDs remained unchanged in the presence of MG, while the fluorescence of rQDs could be quantitatively quenched by MG based on the strategy of fluorescence resonance energy transfer. The ratiometric fluorescence probe (MIPs@gQDs&rQDs) was characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The linear range of MG detection was 0.1–32 μmol L −1 with a detection limit of 8.8 μg kg −1 . The constructed probe has been successfully applied to the detection of MG in fish with the recoveries of 92.3–109.1%, which were validated by the method of HPLC. The result indicated that the probe possessed rapid response, wide linear range, high sensitivity, and relatively high selectivity, and was low-cost and easy in operation in the detection of MG in fish samples.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 26
·期 2
·1445-1454
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IF 2.8
Wang Daiyao,Zou Jing,Cai Huahua,Huang Yixin,Li Fei,Cheng Qingfeng
Advanced oxidation processes offer effective solutions in treating wastewater from various industries. The process of alkali-activated hydrogen peroxide (H 2 O 2 ) was superior for the treatment of alkaline dye wastewater because no additional reagents were required except H 2 O 2 . However, an important and interesting phenomenon had been observed that the primary reactive species were found different for degrading organic pollutants with the process of alkali-activated H 2 O 2 . Azo dye of Orange G (OG) and triphenylmethane dye of Rhodamine B (RhB) were chosen as the target organic pollutants. The influences of various parameters on OG and RhB degradation by alkali-activated H 2 O 2 were evaluated. Furthermore, different scavengers, including ascorbic acid, methanol, t -butanol, isopropyl alcohol, furfuryl alcohol, and nitro blue tetrazolium, have been tested to identify the active species involved in dye degradation, and it was found that O 2 ·− was mainly responsible for degrading OG, while HO 2 − anion was the primary oxidant for degrading RhB.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 1
·855-861
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IF 2.324
Yu Binglong,Wen Yu,Yang Xiaoxin,Cai Xiulan
The growth of metal mixed semiconductor particles was known to enhance their photocatalytic properties. In this study, a brand-new and simple one-pot polyol method was successfully used to synthesize metal gold embedded in ZnO nanoparticles (NPs), termed ZnO–Au microspheres. The physicochemical properties of ZnO–Au microspheres were analyzed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy measurements, UV–Vis absorption espectroscopy and Fourier transform infrared espectroscopy. Applied to degradation of methylene blue under visible light, the ZnO–Au microspheres photocatalyst showed better photocatalytic activity than pure ZnO NPs. The reusability of ZnO–Au microspheres was also examined.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 103
·期 2
·793-806
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IF 3.34
Yang Haiquan,Hu Jinyuan,Lu Xiao,Wang Fuxiang,Shen Wei,Hu Wei,Wang Lingling,Chen Xianzhong,Liu Long
Most recombinant proteins in Escherichia coli are not efficiently secreted to the extracellular space. Structural stabilisation of the cell wall is essential for extracellular protein production in E. coli , for which D,D-carboxypeptidases are essential. Herein, we perturbed the peptidoglycan structure of the E. coli cell wall by overexpressing D,D-carboxypeptidase genes dacA or dacB , and investigated the effect on extracellular protein production. Overexpression of dacA or dacB promoted the accumulation of intracellular soluble peptidoglycan, altered cell morphology (shape and size) and led to the formation of transparent globular structures in E. coli cells. Compared with controls (CK), extracellular production of recombinant green fluorescent protein (GFP) was increased by 1.7- and 2.3-fold upon overexpression of dacA and dacB , respectively. Similarly, extracellular production of recombinant amylase and α-galactosidase was increased by 4.5- and 2.8-fold, respectively, upon overexpression of dacA , and by 11.9- and 2.5-fold, respectively, upon overexpression of dacB . Overexpression of dacA or dacB enhanced both the outer and inner membrane permeability of E. coli . This cell wall engineering strategy opens up a new direction for enhancing extracellular protein and chemical production in E. coli .
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-10
·
IF 5.705
Yang Haimei,Jie Xu,Wang Lu,Zhang Yue,Wang Min,Wei Weili
A fluorescent array based on the use of saccharide-functionalized multicolored quantum dots (s-QDs) and of 4-mercaptophenylboronic acid-functionalized MoS 2 nanosheets (PBA-MoS 2 ) was constructed for multiple identification and quantitation of lectins and bacteria. In this array, the fluorescence of the s-QDs is quenched by the PBA-MoS 2 nanosheets. In the presence of multiple lectins, s-QDs differentially detach from the surface of PBA-MoS 2 nanosheets, producing distinct fluorescence response patterns due to both quenching and enhancement of fluorescence. By analyzing the fluorescence responses with linear discriminant analysis, multiple lectins and bacteria were accurately identified with 100% accuracy. The limits of detection of Concanavalin A , Pisum sativum agglutinin, Peanut agglutinin, and Ricius communis I agglutinin are as low as 3.7, 8.3, 4.2 and 3.9 nM, respectively. The array has further been evidenced to be potent for distinguishing and quantifying different bacterial species by recognizing their surface lectins. The detection limits of Escherichia coli and Enterococcus faecium are 87 and 66 cfu mL −1 , respectively.
Schematic of a fluorometric array based on the use of saccharides-functionalized quantum dots (s-QDs) and 4-mercaptophenylboronic acid-functionalized MoS 2 (PBA- MoS 2 ) nanosheets. This array was successfully applied to simultaneously analysis of lectins, bacteria in real samples with high sensitivity and accuracy.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2093-2101
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IF 2.993
Wu Yanzi,Ma Yujie,Xu Guanhong,Xia Tianyi,Liu Wenxuan,Dong Zezhong,Yuan Qing,Zhang Cong,Hu Qin
Two novel porous metal–organic frameworks (MOFs) Cu(TCPBDA) and Cd(TCPBDA) based on a new ligand, namely N,N,N′,N′-tetrakis(4-carboxyphenyl)biphenyl-4,4′-diamine (H 4 TCPBDA), were synthesized by solvent thermal method and characterized with scanning electron microscopy, powder X-ray diffraction, BET analysis and spectrofluorometry. The static adsorption of the two MOFs for lead ions (Pb 2+ ) was investigated. Cu(TCPBDA) showed a higher adsorption capacity for Pb 2+ compared with Cd(TCPBDA), and its maximum adsorption capacity was 300 mg/g. The adsorption performance of Cu(TCPBDA) was then further studied. It was found that the adsorption of Cu(TCPBDA) for Pb 2+ fitted the Freundlich model and pseudo-second-order equation very well. The adsorption ability of Cu(TCPBDA) was applied to fast and efficient adsorption for Pb 2+ in toner. The results indicates that Cu(TCPBDA) is a promising material in adsorption and removal of heavy metal ions.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 87
·期 2
·455-463
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IF 1.745
Jiang Chi,Liu Weiqu,Yang Maiping,He Sha,Xie Yankun,Wang Zhengfang
Abstract Superhydrophobic coatings were successfully fabricated on cotton textiles through a simple one-step sol–gel process. A fluorinated copolymer (PHFA-MPS), as a precursor in the sol–gel reaction, was prepared by copolymerization of hexafluorobutyl methacrylate (HFA) and 3-methacryloxypropyltrimethoxysilane (MPS) as monomers. Then, the fluoro-containing silica sols were formed by alkaline hydrolysis of tetraethylorthosilicate (TEOS) and PHFA-MPS solution in an ethanol solution, which was used to impart the cotton textiles with excellent superhydrophobicity via a facile dip-coating method. The effects of ammonium hydroxide solution (NH 4 OH) and PHFA-MPS concentration on the structure of the fluoro-containing silica sols, as well as the wetting behavior, surface morphology, and surface composition of the as-prepared cotton textiles were characterized. The results show that the resultant cotton textiles exhibited excellent superhydrophobicity with a WCA of 153.4° and satisfied stability, which offers a simple procedure to generate the superhydrophobicity on cotton textiles for use in a wide range of fields.
A series of fluoro-containing silica sols were prepared through ammonium hydroxide catalyzed sol–gel reaction with tetraethylorthosilicate and a fluorinated copolymer as precursors. The fluoro-containing silica nanocomposites imparted excellent superhydrophobicity to the cotton textile.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 25
·6529-6538
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IF 3.307
Han Zhizhong,Luo Min,Weng Qinghua,Chen Li,Chen Jinghua,Li Chunyan,Zhou Ying,Wang Long
A highly sensitive and selective photoelectrochemical (PEC) aptasensor was constructed for carcinoembryonic antigen (CEA) detection based on ZnO flower-rods (ZnO FRs) modified with g-C 3 N 4 -Au nanoparticle (AuNP) nanohybrids. The nanohybrids of g-C 3 N 4 -AuNPs can improve the visible light absorbance of ZnO FRs and enhance the PEC property. We designed a sandwichlike structure formed with DNA hybridization of NH 2 -probe1, CEA aptamer, and CuS-NH 2 -probe2 to detect CEA. The p -type semiconductor CuS nanocrystals (NCs) at the terminational part of sandwichlike structure work as electron traps to capture photogenerated electrons and consequently lead to a magnified photocurrent change. The results indicate that the photocurrent is increased when CEA antigen (Ag) is introduced. Since the sandwichlike structure is destroyed, CuS NCs are restricted to capture photogenerated electron. The PEC aptasensor for CEA determination is ranged from 0.01 ng·mL −1 to 2.5 ng·mL −1 with a detection of 1.9 pg·mL −1 . The proposed aptasensor exhibits satisfactory PEC performances with rapid detection, great sensitivity and specificity. Specially, this PEC aptasensor shows a reliable result for the determination of CEA in invalid human serum compared with the ELISA method. The designed aptasensor may provide a new idea for a versatile PEC platform to determine various molecules.
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INVESTIGATIONAL NEW DRUGS
·
2018
·Vol. 36
·期 6
·1147-1157
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IF 3.502
Guo Shewei,Zhen Yingwei,Guo Mengguo,Zhang Longzhou,Zhou Guosheng
Microtubule as an important target in the cancer therapy was used to design novel tubulin polymerization inhibitors. Sulfanilamide-1,2,3-triazole hybrids were designed by a molecular hybridization strategy and their antiproliferative activity against three selected cancer cell lines (BGC-823, MGC-803 and SGC-7901) were evaluated. All sulfanilamide-1,2,3-triazole hybrids displayed potent inhibitory activity against all cell lines. In particular, compound 10b showed the most excellent inhibitory effect against MGC-803 cells, with an IC 50 value of 0.4 μM. Cellular mechanism studies elucidated that 10b induced apoptosis by decreasing the expression level of Bcl-2 and Parp and increasing the expression level of BAX. 10b inhibited the epithelial-mesenchymal transition process by up-regulating E-cadherin and down-regulating N-cadherin. Furthermore, the tubulin polymerization inhibitory activity in vitro of 10b was 2.4 μM. In vivo anticancer assay, 10b effectively inhibited MGC-803 xenograft tumor growth without causing significant loss of body weight. These sulfanilamide-1,2,3-triazole hybrids as potent tubulin polymerization inhibitors might be used as promising candidates for cancer therapy.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 21
·14907-14921
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IF 2.993
Pang Jiafeng,Li Zhixian,Li Shaomin,Lin Shuying,Wang Hongdi,Xie Qiuling,Jiang Yanbin
Integrating various functional components into a single nano-platform is an ideal but challenging strategy for cancer therapy. Herein, a facile approach to fabricating multi-targeted nano-drug delivery systems which can be monitored is reported. Superparamagnetic iron oxide nanoparticles (SPIONs) and gefitinib (GEF) were encapsulated into folic acid-conjugated zein (Fa–zein) nanocomplexes (GEF-FSZs) with good dispersity, high GEF loading efficiency and pH-dependent release profile. The uptake of water-insoluble GEF was facilitated by encapsulating GEF into a zein-based nanocomplex, the magnetic responsive property endowed by SPIONs and the conjugation of Fa, which resulted in enhanced toxicity to A549 cells. The endocytosis study indicated that macropinocytosis and clathrin/caveolae-independent endocytosis exerted great influence on the internalization of GEF-FSZs. These results implied that GEF-FSZs could be a promising candidate for controlled and targeted drug delivery.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 21
·14998-15008
·
IF 2.993
Zuo Yong,Liu Yu,He Qiong-Ping,Song Ji-Ming,Niu He-Lin,Mao Chang-Jie
CuAgSe is a promising thermoelectric (TE) material for its superior carrier mobility and ultralow lattice thermal conductivity. Herein, we present a scalable colloidal method to prepare monodisperse CuAgSe nanocrystals with high yield. The collected powder sample was washed by a sulfur-free reagent of NaNH 2 to remove the surface organic ligands (CuAgSe-W) and then annealed (CuAgSe-W-A). Both kinds of ligand-free samples were then hot pressed into dense pellets to measure the TE property. The results revealed that the crystal structure of both samples changed from low-temperature β-phase to high-temperature α-phase at around 465 K. Sample CuAgSe-W shows interesting temperature-dependent transition from N -type to P -type, which could be potentially used as thermal control transistor. Sample CuAgSe-W-A does not display this transition state but it exhibits potential for intermediate temperature TE applications with a figure-of-merit zT reaching 0.68 at 566 K.
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