JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 11
·4780-4791
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IF 3.553
Zeng Zhaowei,Yi Lei,He Jianwei,Hu Qian,Liao Yucong,Wang Yadong,Luo Wenbin,Pan Mu
Highly dispersed electrocatalysts and single-atom catalysts receive extensive attention in the field of multiple reactions involving water spitting, oxygen reduction, and CO 2 reduction. Herein, we develop a Fe/N co-doped hierarchically structured porous carbon (Fe/N/C-DT) by the dual-templating approach, involving the incorporation of ferrocenecarboxaldehyde (Fc–CHO) into the polyimide, followed by carbonization at 900 °C and etching. A steric hindrance offered by the ferrocene and the porosity of the obtained nanostructure prevent the aggregation of Fe atoms, resulting in the maximization of catalytic efficiency of iron-based sites. FeCl 2 /N/C-DT and FeSO 4 /N/C-DT using FeCl 2 and FeSO 4 as iron sources, respectively, are prepared for comparison, to further confirm the potential positive effect of Fc–CHO and explore the synergistic effect of the pentagon defects and Fe–N 4 on the catalytic performance in oxygen reduction reaction (ORR). The prepared Fe/N/C-DT exhibits outstanding electrochemical activity toward ORR ( E 1/2 = 0.902 V vs RHE) and impressive OER activity ( E j =10 = 1.66 V) in alkaline conditions. The rechargeable Zn–air battery using Fe/N/C-DT as a cathode catalyst shows a peak power density of 220 mW cm −2 and a high open–circuit voltage of 1.451 V in the all-solid-state Zn–air battery.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 6
·1343-1351
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IF 3.637
Zhang Lei,Wang Junping,Deng Jiankang,Wang Shuo
In this study, a novel fluorescent “turn-on” aptasensor was developed for sensitive and rapid detection of tetracycline (TC) in animal-derived food. It is based on aptamer-functionalized nitrogen-doped graphene quantum dots (N-GQDs-aptamer) coupled with cobalt oxyhydroxide (CoOOH) nanoflakes. The CoOOH nanoflakes are efficient fluorescence quenchers in homogeneous solutions, and this is due to their advantages of excellent optical properties, superior flexibility, and water dispersibility. The proposed method’s mechanism is driven by quenching based on the fluorescence resonance energy transfer (FRET) between the donor (N-GQDs) and the acceptor (CoOOH nanoflakes). On the other hand, fluorescence recovery is caused by the structure switching behavior of the aptamer. Compared with previous methods, our developed method exhibits better behavior in terms of being easy to fabricate and being simple in detection procedure and maintains the detection limit low enough in TC determination: a linear range from 1 to 100 ng mL −1 and a detection limit of 0.95 ng mL −1 (S/N = 3). Furthermore, the proposed method was applied to five animal-derived food samples (milk, honey, fish, eggs, and chicken muscle) and demonstrated practical applicability. As well, the method has the advantages of simplicity in pre-treatment and convenience in instruments, saves times, and is cost-effective. Finally, the proposed method demonstrates significant potential for sensitive and rapid detection of specific components in real samples.
Graphical abstract
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2019
·Vol. 26
·期 4
·273-282
·
IF 0
Liu Qing,Pu Yuan,Zhao Zhijian,Wang Jiexin,Wang Dan
We developed the high-gravity coupled liquid–liquid interface reaction technique on the basis of the rotating packed bed (RPB) reactor for the continuous and ultrafast synthesis of silver sulfide (Ag 2 S) quantum dots (QDs) with near-infrared (NIR) luminescence. The formation of Ag 2 S QDs occurs at the interface of microdroplets, and the average size of Ag 2 S QDs was 4.5 nm with a narrow size distribution. Ag 2 S QDs can disperse well in various organic solvents and exhibit NIR luminescence with a peak wavelength at 1270 nm under 980-nm laser excitation. The mechanism of the process intensification was revealed by both the computational fluid dynamics simulation and fluorescence imaging, and the mechanism is attributed to the small and uniform droplet formation in the RPB reactor. This study provides a novel approach for the continuous and ultrafast synthesis of NIR Ag 2 S QDs for potential scale-up.
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CELLULOSE
·
2019
·Vol. 27
·期 1
·469-480
·
IF 3.917
Zhang Kangmin,Wang Miaomiao,Wu Mingyuan,Wu Qingyun,Liu Jiuyi,Yang Jianjun,Zhang Jianan
Abstract Effective separation of oil and water has always been a long-term challenge. Here we introduce a facile and fluorine-free method to fabricate superhydrophobic and superoleophilic filter paper without the decoration of solid particles for robust oil/water separation. After chemically bonding octadecanoyl and α-bromoisobutyryl groups on the surface of filter paper through simultaneous esterification with stearoyl chloride and α-bromoisobutyryl bromide (BiBB) to obtain C18-FP-g-Br, superhydrophobic poly(styrene-co-acrylonitrile) (SAN) grafted filter paper (C18-FP-g-SAN) was fabricated via surface-initiated atom transfer radical polymerization. The obtained C18-FP-g-SAN showed a water contact angle of 153° and achieved a separation efficiency exceeding 98.5% after ten different typical oil/water separation processes due to the synergistically combined contributions of bonded octadecanoyl chain and grafted SAN. C18-FP-g-SAN remained high separation efficiency after 10 cycles of use and treatment with strong acidic or basic solution. The excellent reusability and chemical stability of C18-FP-g-SAN promise its practical applications of continuous oil/water separation and oil spillage cleanup. Graphic abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 126
·期 1
·1-14
·
IF 1.784
Zhou Haikun,Gao Pingping,wang Pan,Xie Zhiyong,Wu Xiaobo
Titanium nitride (TiN) nanoparticles (NPs) were added into polytetrafluoroethylene (PTFE) emulsion for the hydrophobic treatment of carbon papers (CPs). The addition of the nano-sized conducting nanoparticles in impregnation solution could improve the corrosion resistance, electrical conductivity, hydrophobicity and durability of the treated CPs. It is found that the corrosion resistance and electrical conductivity of the as-treated CPs increased gradually as the increment of TiN content. CPs impregnated with PTFE emulsion containing 8 wt% TiN NPs displayed the optimal improved corrosion resistance with corrosion potential and corrosion current density at 0.16 V and 0.056 μA/cm 2 , respectively. Characterizations by SEM, Raman and XPS demonstrate that this improvement is associated with the formation of TiN coating and the improved distribution of PTFE on CPs.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 1
·1-9
·
IF 6.232
Duo Huixiao,Li Yijing,Liang Xiaojing,Wang Shuai,Wang Licheng,Guo Yong
Magnetic hierarchical nickel/nickel oxide/carbon nanorods (Ni/NiO@C) were prepared via the pyrolysis of a metal-organic framework containing nickel(II) nickel (Ni-MOF; Ni 3 (BTC) 2 ) under argon atmosphere. In this material, magnetic Ni/NiO@C nanoparticles are embedded in porous carbon nanorods, and the morphology is similar to that of the original Ni-MOF precursor. The synthesized nanorods were applied as magnetic sorbents in the solid-phase extraction of five benzoylurea insecticides (flufenoxuron, chlorbenzuron, teflubenzuron, diflubenzuron and triflumuron), and their performance was evaluated under optimized conditions. The results show that the material exhibits high extraction recoveries from spiked samples (82.9%–107.6%) and linear response in the range of 0.2–450 μg·L −1 . It is also characterized by relatively low limits of detection (50–100 ng·mL −1 ) at a signal-to-noise ratio of 3. The sorbent is chemically stable and can be repeatedly recycled, with little decline in extraction capacity after 20 cycles of reuse. The method was successfully applied to the quantification of benzoylureas in tea, wolfberry, millet, and oat samples, and it showed high extraction efficiency.
Schematic representation of the synthesis of magnetic hierarchical nickel/nickel oxide/carbon nanorods derived from Ni-MOF. The material is employed as a sorbent for the magnetic solid-phase extraction of benzoylurea insecticides.
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Nano Research
·
2020
·Vol. 13
·期 1
·160-172
·
IF 8.183
Zhang Amin,Zhang Qian,Alfranca Gabriel,Pan Shaojun,Huang Zhicheng,Cheng Jin,Ma Qiang,Song Jie,Pan Yunxiang,Ni Jian,Ma Lijun,Cui Daxiang
Distinctively different metabolism between tumor cells and normal cells endows tumor tissues unique microenvironment. In this regard, we have successfully prepared a sequential catalytic platform based on Au/Pt star for tumor theragnostic. The multifunctional probes consisted of a gold/platinum star-shaped core (Au/Pt star) conjugated with a GSH-sensitive disulfide bond (S–S), a targeting ligand (rHSA-FA), a near-infrared fluorophore (IR780) and glucose oxidase (GO x ). When systemically administered in a xenografted murine model, the probes specifically targeted the tumor sites. As the disulfide linker was cleaved by intracellular GSH, the IR780 molecules could be released for photo-thermal therapy & photodynamic therapy (PTT&PDT) and imaging. Subsequently, the Pt nanolayer of the Au/Pt star and the GO x formed a sequential catalytic system: GO x effectively catalyzed intracellular glucose by consuming oxygen to generate H 2 O 2 and enhance the local acidity, and the Pt layer exhibited peroxidase-like property to catalyze H 2 O 2 producing toxic ·OH for tumor oxidative damage. Here we demonstrated that our probes simultaneously possessed a GSH-sensitive release, real-time imaging ability, and synergetic cancer starving-like therapy/enzyme oxidative therapy/PTT/PDT features, which provides a potential strategy for effective tumor theragnostic.
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Frontiers of Environmental Science & Engineering
·
2019
·Vol. 14
·期 1
·1-10
·
IF 3.883
Wang Jian,Wang Qun,Gao Xueli,Tian Xinxia,Wei Yangyang,Cao Zhen,Guo Chungang,Zhang Huifeng,Ma Zhun,Zhang Yushan
Mesoporous silica nanoparticles (MSN), with higher water permeability than NaA zeolite, were used to fabricate thin-film nanocomposite (TFN) reverse osmosis (RO) membranes. However, only aminoalkyl-modified MSN and low-pressure (less than 2.1 MPa) RO membrane were investigated. In this study, aminophenyl-modified MSN (AMSN) were synthesized and used to fabricate high-pressure (5.52 MPa) RO membranes. With the increasing of AMSN dosage, the crosslinking degree of the aromatic polyamide decreased, while the hydrophilicity of the membranes increased. The membrane morphology was maintained to show a ridge-and-valley structure, with only a slight increase in membrane surface roughness. At the optimum conditions (AMSN dosage of 0.25 g/L), when compared with the pure polyamide RO membrane, the water flux of the TFN RO membrane (55.67 L/m 2 /h) was increased by about 21.6%, while NaCl rejection (98.97%) was slightly decreased by only 0.29%. However, the water flux of the membranes was much lower than expected. We considered that the enhancement of RO membrane permeability is attributed to the reduction of the effective thickness of the PA layer.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 2
·1547-1553
·
IF 2.195
Jiang Wenya,Peng Cong,Yuan Yanyu,Yang Shibo,Li Xifeng
In this paper, the indium gallium zinc oxide (IGZO) thin-film transistors (TFTs) with chitosan (CS) gate dielectric are prepared by the conventional photolithography technique on a pilot line. As-prepared devices on 200 × 200 mm substrate is very uniform, and have good performance of high on/off drain current ratio ~ 10 −6 , low subthreshold swing ~ 0.24, low-threshold voltage ~ 0.20 V and high-visible light transmittance > 90%. The glucose oxidase is drop-cased on the CS gate dielectric surfaces to make fully transparent CS-based IGZO TFTs with sensitivity to glucose. It is found that the current noticeably changes with increasing glucose concentrations. Herein, the glucose detection range from 0.5 to 30 mM covers the normal range of human blood glucose concentration. Moreover, the response time for glucose sensing is < 10 s, which is effective in detecting glucose. The results suggest that the CS-based IGZO TFTs can be used to detect glucose and provides a simple process to achieve low-cost- and larger-area fabrication of biosensors.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 1
·111-122
·
IF 1.986
Wang Yinfeng,Li Zhi,Huber Lukas,Wu Xiaoxu,Huang Siqi,Zhang Yan,Huang Rui,Liu Qiong
Reducing organic groups on hydrophobic silica aerogels (SA) is worth exploring for lowering their thermal hazard risk. In this work, we used dimethyldichlorosilane (DMDCS) to modify silica alcogels, investigated the effects of DMDCS concentration and focused on the thermal hazard assessment of the DMDCS modified SA (DSA). It was turned out that the DSA had less −CH 3 content in spite of the thermal stability close to the trimethylchlorosilane modified SA (TSA), about 240 °C. The kinetics study suggested the apparent activation energy ( E a ) could be divided into two segments, corresponding to the two processes in the pyrolysis. The positive enthalpy and entropy changes indicated that the thermal oxidation of the DSA was an exothermic reaction, which could not occur without external energy supply. The average E a of the DSA was far larger than that of the TSA and the gross calorific value of the DSA decreased by about 12% compared with that of the TSA. All these results drew a conclusion that the DMDCS modified SA reduced the thermal hazard to some degree, which provided one possible solution to further lower the thermal hazard of hydrophobic SA.
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INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2019
·Vol. 40
·期 11
·1-11
·
IF 0.853
He Yijian,Cao Chao,Xu Jiachen,Sun Yue,Chen Zepeng,Chen Guangming
Aqueous LiCl solutions are typical desiccants. Specific thermal capacity data, covering the temperatures range from 233.15 K to 343.15 K and salt mass fractions ranging from 0.15 to 0.45, have been obtained experimentally. The correlating equation proposed reproduces these experimental data with an average absolute deviation of 0.35 %, and a maximum absolute deviation of 1.15 %. Experimental data from the literature, and theory-based calculations, are reproduced by the new equation with a maximum deviation of 16.13 %, and 10.77 %, respectively.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Yi Jiecan,Wu Pian,Li Guiyin,Xiao Wen,Li Lei,He Yayuan,He Yafei,Ding Ping,Chen Cuimei
An aptamer-based assay is described for the determination of Salmonella typhimurium ( S. typh ). Carboxymethyl chitosan was loaded with amino-modified aptamer against S. typh , and then adsorbed on gold nanoparticles by electrostatic interaction to form a composite that acts as the molecular recognition element. In the presence of S. typh , it will be bound by the aptamer, and this changes the structure of the recognition element. On addition of salt solution, the gold nanoparticles agglomerate so that the color of the solution changes from red to blue. S. typh can be detected via measurement of the absorbance at 550 nm. Absorbance increases linearly with the logarithm of the S. typh concentration in the range from 100 to 10 9 cfu·mL −1 . The limit of detection is 16 cfu·mL −1 . The specificity and practicability of the assay were evaluated. The recoveries of S. typh from spiked milk samples are between 92.4 and 97.2%. The analytical results are basically consistent with those of a plate counting method.
Schematic representation of the colorimetric assay for Salmonella typhimuium ( S . typh ) using carboxymethyl chitosan (CMCS)-aptamer (Apt)-gold nanoparticles (AuNPs) composites.
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