ANALYTICA CHIMICA ACTA
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2021
·
IF 6.558
Biying Zhao,Ping Miao,Ziheng Hu,Xinying Zhang,Xue Geng,Yingying Chen,Lingyan Feng
Prostate specific antigen (PSA) has become a potential biomarker for detecting prostate cancer (PCa) in the early stage. Herein, we report a target-induced resolution for the detection of PSA sensitively and specifically by amperometric electrochemical measurements. To meet a satisfactory performance, three conformations of pre-design DNA aptamers including two stem-loop structures and a double strand structure have been investigated and compared. All of them are immobilized on gold electrode as capture probes with redox-active molecular. The mechanism of signal transduction depends on molecular recognition events involving aptamer conformational changes, thus influencing the charge transfer. A short, single-stranded DNA (ssDNA) pseudoknot forming two stem-loop structural aptamers with labeled MB at the 3′ -terminus was found to posse the highest signal variation than other structure when induced by PSA due to the strong conformational change. With the optimized capture strand, the aptasensor showed the peak current increase of MB by the binding relationship between PSA and the sensor over a wide concentration range of 4 magnitude orders. The proposed aptasensor exhibited a wide detection range from 10 pg/mL to 500 ng/mL with a low detection limit of 1.24 pg/mL (S/N = 3). Moreover, the electrochemical aptasensor demonstrated good reproducibility, sensitivity, selectivity , and reliability for the detection of PSA. We also found the aptasensor had a good response in the human serum samples, making this device easy to operate for the detection of the PSA physiological concentration.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 20
·6108
·
IF 4.412
Xiaoli Wang,Xinyu Zhao,Yin Wang
There is an ever-increasing trend toward bendable and high-energy-density electrochemical storage devices with high strength to fulfil the rapid development of flexible electronics, but they remain a great challenge to be realised by the traditional slurry-casting fabrication processes. To overcome these issues, herein, a facile strategy was proposed to design integrating an electrode with flexible, high capacity, and high tensile strength nanosheets with interconnected copper micro-fibre as a collector, loaded with a novel hierarchical SnO2nanoarchitecture, which were assembled into core–shell architecture, with a 1D micro-fibre core and 2D nanosheets shell. When applied as anode materials for LIBs, the resultant novel electrode delivers a large reversible specific capacity of 637.2 mAh g−1at a high rate of 1C. Such superior capacity may benefit from rational design based on structural engineering to boost synergistic effects of the integrated electrode. The outer shell with the ultrathin 2D nanoarchitecture blocks can provide favourable Li+lateral intercalation lengths and more beneficial transport routes for electrolyte ions, with sufficient void space among the nanosheets to buffer the volume expansion. Furthermore, the interconnected 1D micro-fibre core with outstanding metallic conductivity can offer an efficient electron transport pathway along axial orientation to shorten electron transport. More importantly, the metal’s remarkable flexibility and high tensile strength provide the hybrid integrated electrode with strong bending and stretchability relative to sintered carbon or graphene hosts. The presented strategy demonstrates that this rational nanoarchitecture design based on integrated engineering is an effective route to maintain the structural stability of electrodes in flexible LIBs.Keywords:anode;flexible electronics;nanosheets;SnO2
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 52
·33036-33047
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IF 3.361
Ying Li,Fei Lu,Qing-zhi Li,Yi-hua Zhou,Jun Qian,Sheng Cao,Chen-yu Wang
Copper ion (Cu2+) plays an important role in the human body because it is beneficial for metabolism. However, an excessive or slight amount of Cu2+ can cause various symptoms. Therefore, it is necessary for human health to realize the trace and visual detection of Cu2+. Referring to traditional fluorescence test papers, the qualitative and semi-quantitative detection of Cu2+ could be realized by a dual-carbon dots (CDs) ratiometric fluorescent paper-based sensor with the advantages of environmental protection, portability and low cost. In this paper, the inkjet-printed test paper with the best mixing ratio of the two CDs has been researched to maximize the spectral energy transfer of ion detection (maximum color gamut expansion). Among them, the preparation method of b-CDs has been improved, increasing the photoluminescence quantum yield (PLQY) to 88.9%. The sensitivity detection limit of the double emission ratio sensor was 0.15 nM in solution, and the human eye can distinguish at least 3 μmol L−1 Cu2+ in the paper-based sensor. Compared with the traditional single-emission sensor, the human eye was more sensitive to the color change of the emission ratio sensor. The results indicate that we not only realized the micro detection of Cu2+ with convenient methods, but also provided a promising strategy for the visual detection of Cu2+.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yunrui Han,Lin Han,Limin He,Shipeng Wang,Xiaoming Luo
The initial motion of micro-oil droplets on substrates immersed in water is of great significance to study droplet motion. Here, microscopic experiments and mechanism analysis are used to establish a universal criterion and a mathematical model describing the critical conditions for the initial motion of droplets adhered on surfaces with different wettability in the laminar flow. We demonstrate a surface modification technique and analysis method in a microtest. Based on the force’s analysis on the three-phase contact points of two-dimensional oil droplets on the surfaces, the movement mechanism is also obtained when the oil droplets start to move. In addition, this work focuses on the coupling effects of oil droplet’s height, surface properties, and water flow velocity on the initial motion behaviors of oil droplets and obtains the critical shear water flow velocity required for the critical movement of oil droplets from different surfaces. We achieve a universal criterion and model for different application scenarios, which are of great scientific significance to improve theoretical systems of multiphase separation and guide the design and optimization of surface properties and flow field velocity.
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OPTICAL FIBER TECHNOLOGY
·
2021
·
IF 2.53
Zhenglan Bian,Chunpeng Zhao,Shi Feng,Liang Xue,Anduo Hu,Hui Yang,Fenghong Chu
This paper proposes a dissolved oxygen sensing system based on PMMA plastic optical fiber covered at one end with biocompatible PEGDA (Polyethylene glycol diacrylate) hydrogel film. PEGDA, 2-hydroxy-2-methyl-propiophenone and DI water mixture was used as hydrogel precursors, and a certain concentration of oxygen-sensitive fluorescent indicator was incorporated into it. Fluorescence quenching method was used to detect dissolved oxygen in water, the doping concentration of fluorescent indicator in the hydrogel film was optimized. The experimental results indicate that the plastic optical fiber coated with hydrogel sensing film has good reproducibility, and the response time is within 10 s. The sensing characteristics of dissolved oxygen at 30 °C, 35 °C, and 40 °C were tested respectively, and the results showed that the linearity of the system is best at 35 °C. Within the range of pH 2–12, the fluorescence intensity of the fluorescent indicator is very stable. The sensor with biocompatible material is expected to be applied to the monitor of dissolved oxygen in the domain of biomedicine.
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POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 12
·1717-1724
·
IF 2.99
Lei Wang,Yifan Huang,Binjie Xin,Tingxiao Li
Electrospun core–shell nanofibers have aroused attention in drug delivery systems and tissue engineering because of the latent structures which can encapsulate various drugs and obtain tailored release profiles. Here, poly( l -lactide- co -ε-caprolactone) (PLCL) with gelatin (GE) blends were employed to electrospin the shell of core–shell nanofibers which could act as a protection layer for the controlled released behavior of the model drug doxorubicin hydrochloride (DOX). Core–shell nanofiber membranes with different drug loaded amounts were fabricated and the corresponding drug release behaviors were researched. The surface morphology of the obtained nanofibers was assessed by SEM and the structure of the core–shell nanofibers were observed by inverted fluorescence microscopy and TEM. The hydrophilicity was evaluated by water contact angle testing and the results indicated that the obtained fibers all possess good hydrophilicity. The mechanical properties of the fiber membranes were evaluated by tensile testing. Exploring the composition of the fiber membranes by Fourier transform infrared spectroscopy proved that DOX existed in the drug-loaded fiber membranes. In vitro release was evaluated by UV–visible spectroscopy and the accumulative release curves of DOX showed that increasing drug rates would lead to increasing cumulative release amounts but decreasing cumulative drug release rates. The results indicated that drugs encapsulated in PLCL/GE core–shell nanofiber material would be efficient and a potential material for drug delivery systems. © 2021 Society of Chemical Industry
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DALTON TRANSACTIONS
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2021
·Vol. 50
·期 25
·8917-8926
·
IF 4.39
Xingyu Chen,Yifu Zhang,Chen Wang,Xueying Dong,Changgong Meng
The design and preparation of electrode materials with excellent performance is particularly important due to the current global scarcity of energy supplies, especially those using sustainable and renewable materials. In this work, it is first proposed to apply iron silicate (FeSi), which is synthesized using environmentally friendly biomass as a raw material, as an electrode material for supercapacitors (SCs). FeSi is derived from the calcination of reed leaves (RLs) in combination with a hydrothermal method, and spherical FeSi retains the porosity of the RL precursors and shows remarkable electrochemical performance. The specific capacitance of FeSi as a SC electrode can reach 575 F g−1 at 0.5 A g−1 in the voltage window from −1 to −0.5 V. Simultaneously, the FeSi electrode exhibits favorable cycling stability with 76% capacitance retention after 10 000 cycles and outstanding electrical conductivity. This finding provides a novel method of preparing a kind of untapped electrode material, porous FeSi nanoparticles derived from RLs, and the resulting FeSi material shows enormous potential for energy storage via high-performance SCs.
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高影响因子
Solar RRL
·
2021
·Vol. 5
·期 7
·2100067
·
IF 8.582
Congcong Liu,Haijun Su,Keyu Xie,Hongqiang Wang,Peng Zhai,Ninghui Chang,Shan Zhang,Qingfu Ban,Min Guo,Jun Zhang,Lin Liu
SnO 2 aqueous colloids as electron transport layers (ETLs) have been widely employed in planar perovskite solar cells (PSCs). However, the surface defects and energy level mismatch at the SnO 2 ETL/perovskite interface are still great challenges for the power conversion efficiency (PCE) improvement. Herein, a natural and nontoxic phytic acid (PA) compound is introduced into the SnO 2 aqueous colloids to prepare the ETL to depress its defects, and systematically study the influence of different PA complexation on the photovoltaic performance of PSCs. The results demonstrate that PA complexation can assemble unique coordination complexes between PA and SnO 2 nanocrystals (NCs) in a new bonding of Sn O P, which can passivate SnO 2 inherent surface defects and tune the electronic properties of SnO 2 ETLs. PA complexation can significantly disaggregate the SnO 2 oligomers and reduce the cluster size distribution from 98.37 to 15.87 nm. Meanwhile, the reduction of surface trap states inhibits the potential barriers, thus the electrical conductivity is about two times as high as compared with the pristine SnO 2 ETLs. Consequently, a high PCE of 21.43% in PA-SnO 2 -based PSCs is obtained, which presents an improvement of 10.9% over that of the pristine SnO 2 -based PSCs.
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WEAR
·
2021
·
IF 3.892
Zheng Zhang,Yanbao Guo,Fei Han,Deguo Wang,Siwei Zhang
Two dimensional (2d) lubricant materials further explore their application in oil and gas field with the research direction of reducing friction and wear. In this study, we added multilayer graphene into water-based sand cleaning liquid to reduce friction and wear of the CT80 coiled tubing . The results showed that the addition of multilayer graphene significantly improved the anti-friction and wear resistance. Adding 0.5% multilayer graphene effectively reduced COF and wear by 75%. Additionally, the higher multilayer graphene concentration, the greater CT80 material withstood the load of severe wear. Multilayer graphene can be adsorbed on the wear debris or form a lubrication film on both worn surfaces, which facilitated the transportation of the debris. Moreover, the wear analysis indicated the main wear form of the CT80 material was abrasive wear and fatigue wear.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yuanyi Zhu,Xiuxiang Liao,Hengrui Qiu,Shengli An,Yongqiang Zhang,Wenxiu He
The mixed metal oxides with high conductivity and multi-metal centers could easily meet the growing needs of high performance energy-storage materials. Herein, ternary phase aluminum-nickel-cobalt oxide (AlNiCo-O) is facilely prepared by a hot-air oven-based method with a subsequent calcination . The as-obtained AlNiCo-O flower-like network makes fully use of the synergistic effects among the transition metals, and exploits more electro-active surface sites, thereby allowing to undergo the redox reactions more efficient. The AlNiCo-O electrode exhibits better charge storage performances with a remarkable specific capacity of 1008.5 C g −1 at 1 A g −1 . Furthermore, the hybrid supercapacitor based on AlNiCo-O electrode exhibits a high energy density of 63.3 W h kg −1 at the power density of 881.4 W kg −1 , good rate capability (41.6 W h kg −1 at 13.3 kW kg −1 ) and a satisfying cycling performance of 84.27% after 5000 cycles. This work proposes a feasible design of high-efficiency metal oxides for application in hybrid supercapacitors.
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FUEL
·
2021
·
IF 6.609
Hualin Lin,Suya Yin,Baoting Su,Yuan Xue,Sheng Han
The combined-pour point depressants (PPDs) have shown potential for the improvement of the cold flow properties of diesel. In this study, free radical polymerization was used to polymerize methacrylate (RMC) and acrylamide (AM) in different molar ratios (1:1, 3:1, 6:1, 9:1, 12:1, 15:1). Methacrylate-acrylamide copolymers (RMC-AM) were synthesized and analyzed through Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance ( 1 H NMR), and thermogravimetric analysis (TGA) to characterize the copolymers. Through exploring the effect of different chain lengths and different monomer molar ratios on the solid point (SP) and cold filter-plugging point (CFPP) of diesel, C 14 MC-AM (9:1) showed relatively good performance (ΔSP = 25 °C, ΔCFPP = 10 °C). Then, ethylene–vinyl acetate copolymer (EVA) materials with different VA content were introduced in this study. Diesel treated with 1000 ppm of EVA-2 (VA = 28%) showed relatively good performance (ΔSP = 18 °C, ΔCFPP = 10 °C). C 14 MC-AM (9:1) was mixed with EVA −2 in different ratios (1:0, 4:1, 2:1, 1:1, 1:2, 1:4, and 0:1, namely, PPDC-1 ~ 7) to produce synergy and improve the cold flow properties of diesel. The ΔSP and ΔCFPP of diesel fuel treated with only 500 ppm PPDC-5 can reach 28 °C and 23 °C, respectively. In addition, the crystallization behavior and crystal morphology of the treated diesel fuel were discussed through differential scanning calorimeter, polarized optical microscope and rheological analysis. The results showed that the combined-PPD made the wax crystals dissolve in the diesel system. The wax crystals became more uniform and denser under the action of AM polar groups.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Guochao Yang,Jingrui Cai,Yaru Geng,Bingbing Xu,Qiuhui Zhang
After the flame-retardant treatment, a pulp fiber has the problems of high smoke production and high smoke toxicity. To solve the above problems, a ZSM zeolite after copper modification was added to the ammonium polyphosphate (APP) flame-retardant pulp, and the effects of the modified ZSM zeolite on flame retardance, smoke suppression, and toxicity reduction were investigated. The content of Cu in the ZSM zeolite modified by ion exchange and calcination (500Cu-Z) was 1.73%, and its existing forms were free Cu2+, combined Cu2+, and Cu+. After modification, the strength of the weak and medium strong acids in the zeolite decreased, and the total acid content decreased by 10.90%. However, in the high-temperature range, a new strong acid site appeared. Compared with the APP-treated pulp fiber, the addition of 500Cu-Z could reduce the carbonization length, and the amount of smoke released decreased by 63.28% at the same time. The analysis of the gas composition indicates that the 500Cu-Z zeolite can reduce the relative concentration of CO to decrease the toxicity of smoke in the combustion process. A stronger flame-retardant layer was formed on the surface of the pulp fiber after adding zeolite and APP. There were chemical bonds such as P═O, C═C, C–O, Si–O–Si on the surface of the flame-retardant layer of 500Cu-Z/A/Pulp2.0. The 500Cu-Z zeolite had a synergistic flame-retardant effect with APP on the pulp fiber. After combustion, it was shown that a phosphoric acid layer existed on the surface of the fiber. The addition of zeolites can form a mosaic mechanism between the zeolite and the phosphoric acid layer to strengthen the flame-retardant layer. To conclude, the flame-retardant layer may reduce the generation of smoke and 500Cu-Z zeolites in layer catalytic CO to CO2 in smoke to reduce toxicity.
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