PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 10
·104004
·
IF 1.7
Qijun DUAN,Yanze SONG,Shuai SHAO,Guohua YIN,Haoou RUAN,Qing XIE
The surface flashover of epoxy resin (EP) composites is a pivotal problem in the field of high-voltage insulation. The regulation of the interface between the filler and matrix is an effective means to suppress flashover. In this work, nano ZnO was fluorinated and grafted using low-temperature plasma technology, and the fluorinated filler was doped into EP to study the DC surface flashover performance of the composite. The results show that plasma fluorination can effectively inhibit the agglomeration by grafting –CFx groups onto the surface of nano-ZnO particles. The fluorine-containing groups at the interface provide higher charge binding traps and enhance the insulation strength at the interface. At the same time, the interface bond cooperation caused by plasma treatment also promoted the accelerating effect of nano ZnO on charge dissipation. The two effects synergistically improve the surface flashover performance of epoxy composites. When the concentration of fluorinated ZnO filler is 20%, the flashover voltage has the highest increase, which is 31.52% higher than that of pure EP. In addition, fluorinated ZnO can effectively reduce the dielectric constant and dielectric loss of epoxy composites. The interface interaction mechanism was further analyzed using molecular dynamics simulation and density functional theory simulation.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Rui Liu,Ru Li,Lei Yang,Rong-Xu Wang,Han-Yang Chen,Nan Wang,Zhi Li,You-Qiang Chen,Seeram Ramakrishna,Yun-Ze Long
Herein, FeOOH quantum dots and a Z-scheme BiVO4/g-C3N4 catalyst were coupled to obtain a Z-scheme heterojunction for photo-Fenton reactions to facilitate the transport of electrons and the generation of radicals. The obtained materials exhibited better visible light-driven photo-Fenton degradation of Rhodamine B, which is 22.06 times as high as pure BiVO4, 18.65 times as high as pure g-C3N4, and 3.44 times as high as BiVO4/g-C3N4, showing great potential in photo-Fenton degradation of pollutants. Moreover, the performance tests, radical capture experiments, and time-resolved fluorescence spectroscopy revealed that electron migration exists between the BiVO4/g-C3N4 and FeOOH-QDs. This composite system accelerates the cycling of Fe3+/Fe2+ during the photo-Fenton process, thus continuously generating reactive species (hydroxyl radicals (−OH) and superoxide radicals (−O2–)), leading to the rapid degradation of organic pollutants.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 45
·2304718
·
IF 19
Xin-Yu Huang,Keyu Chen,Wenhe Xie,Yanyan Li,Fan Yang,Yu Deng,Jichun Li,Fengluan Jiang,Yan Shu,Limin Wu,Wan-Feng Xie,Yonghui Deng
Acetic acid (CH 3 COOH) detection with high selectivity at low temperatures is significant due to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas sensors based on metal oxide semiconductors (MOSs) are widely used in detecting various gases, but it is necessary to develop MOSs with novel nanostructures to enhance gas-sensing performance. Herein, a series of bismuth subcarbonate (Bi 2 O 2 CO 3 , abbreviated as BCO) microspheres with highly permeable lamellar structure and tunable Sn-doping ratios (0–5 at%) is synthesized by controlling kinetics equilibrium of the hydrothermal reaction. The sensor based on 3 at% Sn-doped BCO microspheres exhibits excellent gas-sensing performances toward acetic acid (10 ppm), including high sensitivity ( S = 8.3), fast recovery speed (10 s), long-term stability (over 30 days), and good selectivity at a low temperature (150 °C). The unique permeable lamellar structure assembled from 2D Sn-doped BCO nanosheets and rich Sn 4+ doping-induced active sites is mainly responsible for the enhanced gas-sensing performances. Moreover, a new acetic acid reaction process is revealed via in situ diffuse reflectance infrared transform spectroscopy. Density functional theory calculations indicate that Sn-doped BCO has a higher acetic acid adsorption energy and a larger charge transfer than pristine BCO.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Jiajun Wei,Lingxiao Yi,Wang Yuxin,Erkang Li,Zhen Yujie,Fangyu Zhang,Xinlei Niu,Jinshan Wang,Deming Zhao,Yingmin Yu
Liquid–liquid equilibrium (LLE) measurements were conducted at a temperature of 298.2 K and a pressure of 101.3 kPa for the ternary system consisting of 1,3-propanediol, 2-propyl-1-heptanol, and various extractants (n-hexane, vinyl acetate, ethyl benzene, and water). By calculating the distribution constant (D) and selectivity (S) in each system, the ability of four extractants to separate the mixture of 1,3-propanediol and 2-propyl-1-heptanol was compared. Furthermore, the LLE data underwent regression using thermodynamic models NRTL and UNIQUAC. The degree of deviation between the experimental data and regression data was assessed using the root mean square deviation (RMSD) and the average absolute deviation (AAD). The RMSD values for the NRTL and UNIQUAC models were below 0.74 and 0.76%, respectively, with corresponding AAD values below 0.39 and 0.60%. These results indicate a robust concurrence between the experimental data and the outcomes of the regression analysis. Finally, the GUI-MATLAB tool was employed to validate the coherence of the experimental data with the regression parameters. σ-Profiles are used to discuss the interactions of substances in this work. The results showed that the D and S of all four systems were greater than 1, indicating that all four extractants were effective in separating 1,3-propanediol and 2-propyl-1-heptanol. The order of their extraction capacity was water ≥ hexane ≥ ethyl benzene ≥ vinyl acetate.
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Micromachines
·
2023
·Vol. 14
·期 7
·1302
·
IF 3.4
Chuang Wu,Jiju Sun,Binfeng Yin
Microfluidic chips have the advantages of miniaturization, integration, and portability, and are widely used in the early diagnosis of major diseases, personalized medical treatment, environmental detection, health quarantine, and other fields. The existing microfluidic chip manufacturing process is difficult to operate because of complex three-dimensional channels, complicated manufacturing steps, limited printing materials, the difficulty of operating the bonding process, and the need to purchase expensive new equipment. In this paper, an integrated molding method for microfluidic chips that integrates 3D printing and polymer dissolution technology is proposed. First, the channel mold of poly(vinyl alcohol) (PVA) or high impact polystyrene (HIPS) is dissolved to complete the manufacturing of the microfluidic chip channel. The integrated 3D-forming method of microfluidic chips proposed in this paper can manufacture microchannels inside the microfluidic chip, avoid the bonding process, and eliminate the need for rapid alignment of microchannels, material modification, and other operations, thus improving the stability of the process. Finally, by comparing the microchannels made by PVA and HIPS, it is concluded that the quality of the microchannels made by HIPS is obviously better than that made by PVA. This paper provides a new idea for the fabrication of microfluidic chips and the application of HIPS.Keywords:microfluidic;3D printing;bonding method;HIPS;PDMS
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiao Wang,Si Chen,Rui Ding,Nan Zhou,Yan Zheng,Hai-bin Yu,Bin-jun Li,Tai-jiang Gui,Wei-hua Li
Gallic acid-based epoxy resin monomer was synthesized by the natural extract of gallnut for the efficient dispersion of graphene in epoxy resin. The graphene zinc-rich anticorrosion coatings were further prepared on the basis of the graphene / gallic acid-based epoxy resin monomer dispersion system. Electrochemical experiments and spectral characterization were carried out to study the effect of graphene on zinc-rich coatings and its mechanism. Experiments showed that graphene enhanced the cathodic protection currents of the zinc-rich coatings and prolonged the cathodic protection time. Simultaneously, graphene slowed down the penetration of corrosive media into the coatings. The conductivity of graphene improved electrical contact between zinc particles as well as zinc and iron, and transformed un-activated zinc particles into activated zinc particles. The dispersed and layered structure of the graphene extended the permeation path of the corrosive medium, which resulted in reduced permeation rate and decreased water content of the coatings. It was demonstrated by the tracking of zinc corrosion products by micro-area Raman spectroscopy.
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FUEL
·
2023
·
IF 7.4
Qipeng Ma,Weiyao Zhu,Zhiyong Song,Jie Zhang,Bingbing Li,Wengang Bu,Bin Pan
Interfacial tension (IFT) and wettability are two key parameters determining pore-scale oil/water distributions and reservoir-scale hydrocarbon production performances. However, how ionic liquid (IL, a green, stable, and efficient chemical) will manipulate IFT and wettability for EOR in sandstone reservoirs has not been sufficiently investigated yet, and the underlying mechanisms at the micro-level are still unknown. In this study, the influences of two typical ILs at various concentrations (i.e., 0.01, 0.1, 1, and 5 mmol/L) on oil–water IFT and alpha-quartz (α-quartz) wettability were investigated. This study shows that low concentrations of ILs can greatly reduce alkane-water IFT, and gemini IL has higher interfacial activity than mono-cationic IL, which is due to the fact that gemini IL with longer alkyl chains is more likely to form conglomerates at lower concentrations. Both the advancing and receding contact angles increase continuously with concentration in ILs solution, which can be given responsibility for the decrease in IFT and the solid–liquid interaction resulting in an increased capacity of alkane droplets to migrate on the α-quartz surface. Additionally, the molecular dynamic simulations examined the micro-wetting process and interaction energy of the IL-alkane-quartz system, and revealed that ILs can effectively reduce interaction energy between octane droplets and α-quartz surface. These insights have promising applications to enhanced oil recovery and oil contamination removal at subsurface.
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BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Jienan Shen,Zhi Chen,Ruibin Xie,Jingfeng Li,Chunyan Liu,Yaqing He,Xiaopeng Ma,Hui Yang,Zhongjian Xie
Respiratory viruses have long been a major cause of a global pandemic, emphasizing the urgent need for high-sensitivity diagnostic tools. Typical PCR technology can only determine the type of virus in the sample, which is unable to detect different variants of the same virus without costly and time-consuming gene sequencing. Here, we introduce a simple, fully enclosed, and highly integrated microfluidic system based on CRISPR/Cas12a and isothermal amplification techniques (LOC-CRISPR) that can specifically identify multiple common respiratory viruses and their variants. The LOC-CRISPR chip integrates viral nucleic acid extraction, recombinant polymerase amplification, and CRISPR/Cas12a cleavage reaction-based detection, contamination-free detection. In addition, the LOC-CRISPR chip was designed for multiplexed detection (two-sample input and ten-result outputs), which can not only detect the presence of SARS-CoV-2, H 1 N 1 , H 3 N 2 , IVB and HRSV but also differentiate the BA.1, BA.2, and BA.5 variants of SARS-COV-2. For clinical validation, the LOC-CRISPR chip was used to analyze 50 nasopharyngeal swab samples (44 positive and 6 negative) and achieved excellent sensitivity (97.8%) and specificity (100%). This innovative LOC-CRISPR system has the ability to quickly, sensitively, and accurately detect multiple target nucleic acid sequences with single-base mutations, which will further improve the rapid identification and traceability of respiratory viruses infectious diseases.
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Advanced Materials Interfaces
·
2023
·Vol. 10
·期 33
·2300350
·
IF 5.4
Zuozhu Yin,Xiaoxiang Chen,Zongbao Chen,Huaitong Song,Pengyu Lv,Mingshan Xue,Hongyuan Li
Nanocellulose-based strain sensor (NBSS) have been a subject of growing interest for wearable electronics. However, these electronic devices are susceptible to damage when they come into contact with water and organic contaminants. Recently, researchers have developed a superhydrophobic NBSS. Unfortunately, it does not treat organic pollutants in water when used in an underwater environment. In this paper, a new solution: a superhydrophobic photocatalytic self-cleaning NBSS created through scrape coating and dip coating methods is proposed. This new method shows outstanding self-cleaning capabilities against water and organic contaminants due to the synergistic effects of the superhydrophobicity and photocatalysis of MnO 2 nanoparticles. Furthermore, the superhydrophobic photocatalytic self-cleaning NBSS has an exceptional response time of 0.66 s, a fast recovery time of 0.81 s, a sensitivity ≈66.53 at a strain of 0.5%. It is expect that the superhydrophobic photocatalytic self-cleaning NBSS can monitor human movements, including finger twists, wrist movements, elbow bends, and knee movements. Not only is the fabrication method cost-effective and scalable, but the new NBSS holds great promise in a wide range of fields, including human-machine interactive systems, smart systems, and human-body monitoring. Overall, the study provides significant guidance for future designs for wearable strain sensors.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Cunmin Wang,Xinyi Song,Tian Li,Xuanjin Zhu,Shugui Yang,Jintuo Zhu,Xinjian He,Jiefeng Gao,Huan Xu
The concept of triboelectric nanogenerator (TENG)-based fibrous air filters, in which the electroactive fibers are ready to enhance the electrostatic adsorption by sustainable energy harvesting, is appealing for long-term respiratory protection and in vivo real-time monitoring. This effort discloses a self-reinforcing electroactivity strategy to confer extreme alignment and refinement of the electrospun poly(lactic acid) (PLA) nanofibers, significantly facilitating formation of electroactive phases (i.e., β-phase and highly aligned chains and dipoles) and promotion of polarization and electret properties. It endowed the PLA nanofibrous membranes (NFMs) with largely increased surface potential and filtration performance, as exemplified by efficient removal of PM0.3 and PM2.5 (90.68 and 99.82%, respectively) even at the highest airflow capacity of 85 L/min. With high electroactivity and a well-controlled morphology, the PLA NFMs exhibited superior TENG properties triggered by regular respiratory vibrations, enabling 9.21-fold increase of surface potential (−1.43 kV) and nearly 68% increase of PM0.3 capturing (94.3%) compared to those of conventional PLA membranes. The remarkable TENG mechanisms were examined to elaborately monitor the personal respiration characteristics, particularly those triggered large and rapid variations of output voltages like coughing and tachypnea. Featuring desirable biocompatibility and degradability, the self-powered PLA NFMs permit promising applications in the fabrication of ecofriendly air filters toward high-performance purification and intelligent monitoring.
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MOLECULES
·
2023
·Vol. 28
·期 15
·5620
·
IF 4.6
Huan Wang,Qian Ma,Fengmin Sun,Yachuan Shao,Di Zhang,Huilan Sun,Zhaojin Li,Qiujun Wang,Jian Qi,Bo Wang
Metal–organic frameworks (MOFs) with special morphologies provide the geometric morphology and composition basis for the construction of platforms with excellent catalytic activity. In this work, cobalt–cerium composite oxide hollow dodecahedrons (Co/Cex-COHDs) with controllable morphology and tunable composition are successfully prepared via a high-temperature pyrolysis strategy using Co/Ce-MOFs as self-sacrificial templates. The construction of the hollow structure can expose a larger surface area to provide abundant active sites and pores to facilitate the diffusion of substances. The formation and optimization of phase interface between Co3O4and CeO2regulate the electronic structure of the catalytic site and form a fast channel favorable to electron transport, thereby enhancing the electrocatalytic oxygen evolution activity. Based on the above advantages, the optimized Co/Ce0.2-COHDs obtained an enhanced oxygen evolution reaction (OER) performance.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Min Xie,Yuxin Luo,Tingting Gao,Rongye Li
Waste plant resource provides a new sustainable feedstock for the biolubricant, and purification of the effective components in biomass oil is vital to improve the performance of biolubricant. In this work, the crude extract of the aerial part of Codonopsis pilosula was divided into four different parts by petroleum ether, ethyl acetate, n-butanol and water, respectively. Their thermal stability, lubricating performances and mechanisms have been systematically investigated. In the four extracts, the petroleum ether extract displays the best thermal stability and lubricating performance over the entire test conditions, and other three extracts are confronted with lubrication failure at high loads and elevated temperatures. Triterpenoid saponin, typical for n-butanol extract exhibit the best lubricity at room temperature, followed by the fatty acid derivatives as phosphatidylcholine; flavonoid, and sugar exhibit poor lubricity. At high temperature, only the petroleum ether extract retains the good lubricity.
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