MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-10
·
IF 5.7
Yue Yao,Ouyang Hezhong,Ma Mingyi,Yang Yaping,Zhang Haoda,He Aolin,Liu Ruijiang
A “turn-on” aptasensor for label-free and cell-free EpCAM detection was constructed by employing magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites as a matrix for signal amplification and double-stranded complex (SH-DNA/Apt probes) immobilization through Au-S binding. α-Fe 2 O 3 /Fe 3 O 4 @Au could be efficiently assembled into uniform and stable self-assembly films via magnetic-induced self-assembly technique on a magnetic glassy carbon electrode (MGCE). The effectiveness of the platform for EpCAM detection was confirmed through differential pulse voltammetry (DPV). Under optimized conditions, the platform exhibited excellent specificity for EpCAM, and a strong linear correlation was observed between the current and the logarithm of EpCAM protein concentration in the range 1 pg/mL–1000 pg/mL ( R 2 = 0.9964), with a limit of detection (LOD) of 0.27 pg/mL. Furthermore, the developed platform demonstrated good stability during a 14-day storage test, with fluctuations remaining below 93.33% of the initial current value. Promising results were obtained when detecting EpCAM in spiked serum samples, suggesting its potential as a point-of-care (POC) testing. Graphical Abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-10
·
IF 5.833
Hou Xiudan,Wu Wei,Zhao Fangyuan,Xie Wancui,Yang Qingli
A simple, fast and sensitive method for the detection of luteolin is proposed based on the chitosan/reduced graphene oxide aerogel with dispersed ZrO 2 nanoparticles modified glassy carbon electrode (ZrO 2 /CS/rGOA-GCE) as an electrochemical sensor. The ZrO 2 /CS/rGOA composite was prepared by one pot synthesis from a mixture of GO, CS and zirconyl chloride octahydrate, and subsequently be freeze-dried. Scanning electron microscope images showed a typical thin, wrinkled and fluctuant morphology of graphene nanosheets and the polymerized CS and ZrO 2 nanoparticles deposited on the surface of rGOA. Cyclic voltammetry and differential pulse voltammetry were used to measure the electrochemical response of ZrO 2 /CS/rGOA composite-based biosensor towards luteolin at the working potential window (−0.8–0.8 V). The improved performance of this biosensor was attributed to efficient electron transfer and large surface area of 3D rGOA, and high specific activity of Zr towards adjacent hydroxyl groups. Under optimized conditions, the analytical performance of this method towards luteolin was investigated with a detection limit of 1 nM and a linear range from 5 nM to 1000 nM.. Finally, the ZrO 2 /CS/rGOA-GCE electrochemical method coupled with solid phase extraction was used for the detection of luteolin in real samples. Recoveries of spiked samples with different concentrations were in the range 78.6–103.3% with a relative RSD lower than 12.0%.
Schematic representation of the preparation of the ZrO 2 nanoparticles and chitosan doped graphene aerogel modified electrode. The electrode was employed for the detection of luteolin coupled with the solid-phase extraction technique.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 15
·9344-9355
·
IF 4.22
Fang Dan,Yan Bin,Agarwal Seema,Xu Wenhui,Zhang Qian,He Shuijian,Hou Haoqing
The separator is an important component for energy storage devices. At present, the membranes for supercapacitors are rare, especially the ones that work with an alkaline electrolyte. Herein, a type of flexible and highly porous polymer hybrid nanofiber membrane was prepared via a facile electrospinning process and served as a separator for supercapacitor’s work with strong alkaline electrolyte. As obtained, poly[poly(2,5-benzophenone)]bibenzopyrrolone/polyimide (PBPY/PI) membrane showed good thermal stability, high mechanical strength, large electrolyte uptake (452%), and fast ion conductivity (0.68 mS/cm). Moreover, PBPY/PI membrane exhibited excellent alkali resistance. The supercapacitor assembled with PBPY/PI membrane showed much better performance than those assembled with a commercial polypropylene membrane and electrospun polyimide nanofiber membrane and was found without capacitance loss after charge/discharge at 30 A/g for 10,000 cycles at 80 °C. The PBPY/PI membrane is a good candidate with temperature resistance and alkali resistance for high-performance supercapacitors.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-16
·
IF 4.38
Chen Zhiqiang,Wang Yanhong,Luo Liqun,Peng Tiefeng,Guo Feng,Zheng Mingyu
Separation effects of sodium polyacrylate (PAAS) and gum Arabic (GA) on flotation of chalcopyrite and magnesium silicate minerals using potassium butyl xanthate (PBX) as collector were investigated by micro-flotation experiments, zeta potential, Infrared spectral (IR), SEM–EDS, XPS analysis and copper sulphide ore beneficiation test. The micro-flotation experiments and zeta potential measurements showed that combined depressant consisting of PAAS and GA could efficiently reduce the recoveries of mixed minerals of serpentine and talc more than 25%, while that of chalcopyrite remained above 70% at pH 9.2. Infrared spectral (IR), SEM–EDS and XPS analysis showed that PAAS chemically reacted with Mg on the surface of serpentine, while GA adsorbed on talc surface mainly via physical interaction and hydrogen bond may also play a role. Surface synergism between PAAS and GA was investigated by turbidity test and its depression mechanism was proposed. The technology feasibility of using PAAS and GA to improve the copper sulphide ore flotation performance was verified through artificial mixed ore flotation and laboratory closed-flotation operation.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 6
·4323-4337
·
IF 2.87
Cao Mengjing,Cai Qiang,Guo Guangfan,Guo Hong,Chen Yingchao,Zhang Yuping
Polymer microsphere profile control is a promising approach for the profile control of heterogeneous reservoirs. Matching between polymer microspheres after swelling in water and the reservoir pore throat is crucial for profile control. Hydration equilibrium time and swelling ratio are key properties that are a direct result of water shutoff efficacy. In this paper, a hollow structure microsphere with swelling–deswelling properties is synthesized and its physical properties including morphology, particle size distribution, water swelling property and deswelling property are thoroughly examined. Meanwhile, the displacement performances are studied. The results demonstrate that the hollow structure microspheres have good swelling–deswelling properties at different salt concentrations. Compared with two kinds of polymer microspheres with the same material, the hydration equilibrium time of hollow structure microspheres is longer than that of nonhollow polymer microspheres. Moreover, the hollow structure microspheres have an effect on deep plugging. With the hydration time increasing, the tertiary recovery of the hollow structure microspheres solution is higher than that of nonhollow polymer microspheres solution, whether in a homogeneous medium or in a heterogeneous medium.
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Nano Research
·
2021
·Vol. 15
·期 1
·255-263
·
IF 8.897
Xue Shuqing,Wu Guanhong,Li Mingzhong,Liu Zihan,Deng Yuwei,Han Wenqian,Lv Xuanyu,Wan Siyu,Xi Xiangyun,Yang Dong,Dong Angang
Heterostructures composed of two-dimensional (2D) nanosheets and zero-dimensional (0D) nanoparticles (NPs) have attracted increasing attention because of the synergy arising from the coupling interactions between the two mixed-dimensional components. Despite recent advances, it remains a challenge to fabricate 2D/0D heterostructures with clean and accessible surfaces, which is highly desirable for the diversity of catalytic, sensing, and energy storage applications. Herein, we report a generalized methodology that enables the facile assembly of sandwich-like 0D/2D/0D heterostructures with facilitated mass-transport channels and exposed surface active sites. A ligand-exchange strategy with HBF 4 is employed to strip off the surface-coating ligands of colloidal NPs, rendering them positively charged and dispersible in polar solvents. This allows subsequent electrostatic assembly of NPs with oppositely charged 2D nanosheets to afford sandwich-like 0D/2D/0D heterostructures. The barely covered surfaces and the advantageous architectures of such sandwich-like 0D/2D/0D heterostructures induce the desired synergistic effect, making them particularly suitable for electrochemical energy storage and conversion. We demonstrate this by employing MXene/NiFe 2 O 4 and MXene/Fe 3 O 4 heterostructures for high-performance electrocatalytic oxygen evolution and supercapacitors, respectively.
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POLYMER JOURNAL
·
2021
·Vol. 53
·期 8
·923-935
·
IF 3.08
Yu Li-Ming,Luo Zhen,Gong Cui-Ran,Zheng Yang-Qing,Zhou Zhao-Xi,Zhao Hui,Xu Ying
A new binder, poly(2-propenoic acid, 2-methyl-, 3-[(2-aminoethyl) amino]-2-hydroxypropyl ester) (P-HAEAPMA), is synthesized and applied to silicon/graphite (Si/graphite) anodes in lithium-ion batteries. The Si/graphite anode with the binder exhibits good electrochemical stability. Furthermore, the materials on the discarded Si/graphite/P-HAEAPMA electrode can be recycled for use based on water because the P-HAEAPMA binder is easily soluble in water. The discharge capacity and capacity retention rate of the electrode with reused materials are slightly lower than those of the original Si/graphite/P-HAEAPMA electrode. The binder is rich in polar amino and hydroxyl groups, which not only helps to form strong adhesion between the electrode active material and copper foil but also promotes the transport of Li ions. The electrochemical performance of the electrode with the P-HAEAPMA binder is significantly enhanced compared with that of the electrode with the traditional PVDF binder or water-based LA133 binder. After 305 cycles, a specific capacity of 485.0 mA h g −1 and a capacity retention rate of 74.8% are achieved for the Si/graphite/P-HAEAPMA electrode.
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IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 7
·685-695
·
IF 1.899
Zeng Lelin,Zhou Feixiang,Zhan Xuehui,Zhang Yusheng,Xie Wanyun,Wang Guoxiang,Liang Enxiang
Heavy metal pollution is a serious environmental problem, and adsorption is regarded as an effective technology for metal ions removal. A new absorbent triethylene tetramine (TETA)-modified crosslinked polyacrylonitrile (TETA-modified XL-PAN) was prepared by photo-induced precipitation polymerization of acrylonitrile in water at room temperature using FeC 2 O 4 as photoinitiator and N , N′ -methylenebisacrylamide as crosslinking agent. The TETA provided amidogens, to bond Cu(II) ions and the crosslinking agent was used to improve the stability of adsorbent. FTIR, SEM, BET, and TG were used to characterize the TETA-modified XL-PAN. The FTIR results demonstrate that the XL-PAN was successfully modified by TETA. The SEM images show that TETA-modified XL-PAN powders were agglomerated from 100 to 200 nm spherical particles. TETA-modified XL-PAN was used as an adsorbent to remove Cu(II) ion from wastewater. The effects of contact time, pH, Cu(II) concentration, temperature, and reuse cycles on adsorption were investigated, respectively. Experimental results showed that the adsorption isotherms agreed well with the Langmuir model and a chemical adsorption between TETA-modified XL-PAN and Cu(II) was inferred. After optimizing the experimental conditions, the maximum adsorption capacity of TETA-modified XL-PAN for Cu(II) was 46.6 mg/g with an adsorption time of 8 h. Furthermore, the TETA-modified XL-PAN adsorbent can be well regenerated by acid solutions. After eight regeneration and adsorption processes, the adsorption capacity still reached more than 90% of the first adsorption capacity. These results demonstrated the potential use of TETA-modified XL-PAN as an effective adsorbent for Cu(II) ions removal from wastewater.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Wang Dongwei,Wang Jiasheng
The potential of functionalized polypyrrole nanowires (PPyNWs) are demonstrated as a platform for lable-free miRNA detection using electrochemical impedance spectroscopy (EIS). MicroRNAs (miRNAs) detection methods and sensors are mainly challenged by very low concentrations in physiological samples and high similarity among family members. Herein, a sensitive and selective miRNA biosensor was constructed based on electrochemically synthesized PPyNWs, which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method. The prepared PPyNWs/PAMAM hybrid combines the excellent electrical conductivity of conducting polymer PPyNWs with high surface to volume ratio of PAMAM. DNA probes were immobilized onto the PPyNWs/PAMAM hybrid for the construction of the miRNA biosensor. Using the sensitive EIS technique to monitor DNA/miRNA hybridization, the developed biosensor demonstrated excellent sensing performances, such as wide linear range (10 −14 M-10 −8 M) and low detection limit (0.34 × 10 −14 M). Even more encouraging, the response sensitivity of the biosensor was 3.12 times higher than that of the bulk PPy-modified sensor, which proved that the microstructure of the PPy nanowires array can greatly improve the performance of the biosensor. Graphical abstract
An ultrasensitive and selective miRNA biosensor was constructed based on electrochemically synthesized polypyrrole nanowires array (PPyNWs), which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-8
·
IF 5.833
Zhang Bing,Hu Xing,Jia Yejing,Li Jing,Zhao Zhihuan
A photothermal immunoassay using a thermometer as readout based on polyaniline@Au organic-inorganic nanohybrids was built. Temperature output is acquired due to the photothermal effect of the photothermal nanomaterial. Polyaniline@Au organic-inorganic nanohybrids were synthesized by interfacial reactions with high photothermal conversion efficiency. A sandwich structure of the immunocomplex was prepared on a microplate for determination of carcinoembryonic antigen (CEA) by polyaniline@Au organic-inorganic nanohybrids as nanolabel. The released heat based on light-to-heat conversion from the photothermal nanolabel under NIR irradiation is detectable using the thermometer. The increased temperature is directly proportional to CEA concentration. The linear range of the photothermal immunoassay is 0.20 to 25 ng mL −1 with determination limit of 0.17 ng mL −1 . Graphical abstract
Polyaniline@Au organic-inorganic nanohybrids with high photothermal conversion efficiency was synthesized as labels to construct photothermal immunosensor. The sandwich-type immunoassay was built on 96 hole plate based on specific binding of antigen and antibody. Carcinoembryonic antigen in sample was detected quantitatively by thermometer readout.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 3
·1251-1258
·
IF 1.371
Fu Xuan,Zhang Fang,Wu Qiang,Li Yang,Huang Qing-Gang,Yan Ze-Yi
In this study, extraction and separation of thorium(IV) and a few representative rare earths in HNO 3 media was evaluated using trioctylmethylammonium nitrate ([A336][NO 3 ]) ionic liquid. An unexpected novel extraction mechanism was identified based on the studies in the slope analysis and ESI–MS spectrum. The trimer of [A336][NO 3 ] was confirmed to dominate the extraction reaction by ESI–MS spectrum before and after the extraction. The extraction efficiency of La(III), Eu(III) and Lu(III) by [A336][NO 3 ] are much lower than Th(IV) in acid medium, which means that it is possible to separate thorium from rare earths or the rare earth ores by using [A336][NO 3 ].
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 6
·3867-3889
·
IF 2.87
Lin Xing,Chen Yuying,Jiang Jingzhe,Li Jianping,Jiang Yan,Zhang Hongwen,Liu Hongbo
A kind of polyurethane rubber (PU)/n-octadecane (n-OD)@silicon dioxide (SiO 2 )-polymethyl acrylate (PHEMA) form-stable phase change material (PCM) was fabricated in this paper. n-OD@SiO 2 -PHEMA microcapsules were prepared in one-pot, through interfacial hydrolysis polycondensation of alkoxy silanes and radical polymerization of HEMA. Then, n-OD@SiO 2 -PHEMA microcapsules were added into PU matrix to obtain PU/n-OD@SiO 2 -PHEMA composites. SiO 2 -PHEMA hybrid shell not only provides a shelter for core material, but also increases interfacial bonding between microcapsules with PU and effectively improves the mechanical properties of composites. The morphologies, chemical compositions and crystal structures of microcapsules and composites were characterized by SEM, TEM, FT-IR and XRD methods. The thermal and mechanical properties of the microcapsules and composites were characterized by differential scanning calorimetry and mechanical performance tests. The results show that the thermal and mechanical properties of PU/n-OD@SiO 2 -PHEMA composites were better than those of neat PU. The PU/n-OD@SiO 2 -PHEMA composites endow the microcapsules with improved thermal reliability and leakage proof property. The composites were found as form-stable PCM with low leakage rate. The phase change latent heat of the PU/n-OD@SiO 2 -PHEMA composites was up to 85.1 J/g and the composites can be used for thermal energy storage.
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