CHINESE CHEMICAL LETTERS
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2021
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IF 6.779
Decai Yang,Yachao Xu,Kai Pan,Chuanxin Yu,Jiaxing Wu,Mingxia Li,Fan Yang,Yang Qu,Wei Zhou
Surface oxygen vacancy defects of mesoporous CeO 2 nanosheets assembled microspheres (D-CeO 2 ) are engineered by polymer precipitation, hydrothermal and surface hydrogenation strategies. The resultant D-CeO 2 with a main pore diameter of 9.3 nm has a large specific surface area (~102.3 m 2 /g) and high thermal stability. The mesoporous nanosheets assembled microsphere structure prevents the nanosheets from aggregation, which is beneficial to effective mass transfer and shortens the migration distance of charge carriers. After surface hydrogenation, the photoresponse extends to long wavelength region, combing with the band gap from 2.63 eV reduced to 2.39 eV. Under AM 1.5 G radiation, the photocatalytic degradation rate of tetracycline (TC) can be up to 99.99%, which is three times as high as that of pristine CeO 2 microspheres . The excellent solar-driven photocatalytic performance can be attributed to the efficient surface oxygen vacancy engineering and the mesoporous nanosheets assembled microsphere structure, which narrows the band gap, shortens the migration distance of carriers, promotes the spatial separation of photogenerated electron-hole pairs and favors mass transfer. The strategy provides new insights for fabricating other high-efficient oxide photocatalysts .
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高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 12
·1717-1724
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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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高影响因子
CARBON
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2021
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IF 9.594
Hongsheng Liang,Hui Xing,Zhenhui Ma,Hongjing Wu
The development of electromagnetic wave (EMW) shielding and absorbing materials for flexible devices with carbon cloth and cotton cloth as the substrate has been widely reported. However, the utilization of incorrect test methods in recent reports led to the test data erroneously exhibits the actual absorption performance of the flexible absorber, which confuses the cognition of shielding and the absorbent. Moreover, previous studies are mostly based on semi-empirical rules and lack data relationships between absorption and characterization. The dominant dissipation mechanism in EMW absorbent materials demands to be resolved. Hence, we compared the EMW absorption capacity of the hierarchical carbon cloth@NiCo 2 O 4 /NiO hybrid via the waveguide method and the coaxial method. Specifically, the flexible absorber with integrated structure is unfavorable for incident waves to enter its interior due to its skin depth and extremely high conductivity. However, the absorbers made into a paraffin ring showed obvious optimization. Enhanced interfacial polarization is confirmed as the dominant mechanism of EMW dissipation via various characterization and analysis of electromagnetic (EM) parameters. This work provides an insight into the misunderstanding of the rational design of flexible absorbent materials for the first time, which is of great significance to the research of flexible electronic countermeasure materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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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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高影响因子
FUEL
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2021
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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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Advanced Materials Interfaces
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2020
·Vol. 7
·期 21
·2000997
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IF 4.948
Jiangyou Long,Peiyang Zhou,Yajun Huang,Xiaozhu Xie
Achieving sustainable dropwise condensation is still a challenge for the industrial applications of bio-inspired superhydrophobic surfaces in the field of phase-change heat transfer. In this work, 3D conical microtextures covered by various nanostructures are prepared by utilizing femtosecond laser micromachining and solid–liquid reactions, where the introduction of 3D conical microtextures affected both the early distribution and the subsequent coalescence and departure of condensed droplets. Due to the growth and coalescence of condensed droplets, some merged droplets cannot depart from the surfaces due to the pinning effect caused by the localized micro-defects of imperfect nanoscale morphology or chemical heterogeneity, thus resulting in the generation of large pinned droplets. The introduction of 3D conical microtextures helps with the departure of these pinned droplets due to the enhanced Laplace expulsion of conical morphology, which inhibits the increase of large droplets and maintains stable dropwise condensation. The results provide an engineering feasible approach to enhance the long-term robustness of dropwise condensation on superhydrophobic surfaces, thus benefiting the optimal design of practical bio-inspired superhydrophobic surfaces.
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高影响因子
Nanoscale
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2020
·Vol. 12
·期 42
·21770-21779
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IF 6.895
Bohan An,Jiacheng Li,Xiaochao Wu,Wanqing Li,Yongliang Li,Lingna Sun,Hongwei Mi,Qianling Zhang,Chuanxin He,Xiangzhong Ren
To improve the high reversibility of lithium–air batteries, an air electrode needs to have excellent electrochemical performance and spatial structure. Ni3S2 nanoparticles are loaded onto an N,S-doped pearl chain tube (N,S-PCT) by a method called quasi-chemical vapor deposition (Q-CVD). Additionally, N and S are doped during the synthesis process, thereby forming an ideal pipe rack-like structure. The large amount of space in the tube rack can provide sufficient storage to act as a buffer for the discharge products, and the interconnected tubes can effectively promote the dispersion of O2 and electrolyte. The addition of Ni3S2 nanoparticles effectively reduces the charge transfer resistance, thereby increasing the electron mobility of the cathode. Ni3S2@N,S-PCT cathodes effectively improve the cycling and high-rate performance of lithium–air batteries, demonstrating an ultrahigh discharge capacity of 16 733.7 mA h g−1 at a current density of 400 mA g−1 and an ultrahigh discharge capacity of 5088.1 mA h g−1 at a current density of 1000 mA g−1. When the cut-off capacity is 1000 mA h g−1, the battery with the Ni3S2@N,S-PCT-800 electrode can achieve cycling stability for 148 cycles. This research provides a new solution for the design of lithium–air batteries with high electrocatalytic performance.
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PubMed
高影响因子
WEAR
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2021
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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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高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Fan Xie,Yafang Wang,Longhai Zhuo,Fengfeng Jia,Doudou Ning,Zhaoqing Lu
Benefiting from its superior thermal stability, polyimide (PI) fiber-based composites have attracted wide attention in the field of high-temperature filtration and separation. However, the trade-off between filtration efficiency and pressure drop of traditional PI filters with single morphology and structure still remains challenging. Herein, the electrospun PI high-temperature-resistant air filter was fabricated via thermal-induced phase separation (TIPS), employing polyacrylonitrile (PAN) as a template. The PI nanofibers exhibited special wrinkled porous structure, and the filter possessed a high specific surface area of 304.77 m2/g. The removal of PAN changed the chemical composition of the fiber and induced PI molecules to form complex folds on the surface of the fiber, thus forming the wrinkled porous structure. Additionally, the wrinkled porous PI nanofiber filter displayed a high PM0.3 removal efficiency of 99.99% with a low pressure drop of 43.35 Pa at room temperature, and the filtration efficiency was still over 97% after being used for long time. Moreover, the efficiency of the filter could even reach 95.55% at a high temperature of 280 °C. The excellent filtration performance was attributed to the special wrinkled porous surface, which could limit the Brownian motion of PMs and reinforce the mechanical interception effect to capture the particulate matters (PMs) on the surface of the filter. Therefore, this work provided a novel strategy for the fabrication of filters with special morphology to cope with increasingly serious air pollution in the industrial field.
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高影响因子
Materials
·
2020
·Vol. 13
·期 20
·4611
·
IF 3.057
Wen Ding,Xiaozhong Wu,Yanyan Li,Shuo Wang,Shuping Zhuo
The biomass-based carbons anode materials have drawn significant attention because of admirable electrochemical performance on account of their nontoxicity and abundance resources. Herein, a novel type of nickel-embedded carbon material (nickel@carbon) is prepared by carbonizing the dough which is synthesized by mixing wheat flour and nickel nitrate as anode material in lithium-ion batteries. In the course of the carbonization process, the wheat flour is employed as a carbon precursor, while the nickel nitrate is introduced as both a graphitization catalyst and a pore-forming agent. The in situ formed Ni nanoparticles play a crucial role in catalyzing graphitization and regulating the carbon nanocrystalline structure. Mainly owing to the graphite-like carbon microcrystalline structure and the microporosity structure, the NC-600 sample exhibits a favorable reversible capacity (700.8 mAh g−1at 0.1 A g−1after 200 cycles), good rate performance (51.3 mAh g−1at 20 A g−1), and long-cycling durability (257.25 mAh g−1at 1 A g−1after 800 cycles). Hence, this work proposes a promising inexpensive and highly sustainable biomass-based carbon anode material with superior electrochemical properties in LIBs.Keywords:biomass-based carbon;nickel nanoparticles;lithium-ion batteries;anode material
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高影响因子
Membranes
·
2021
·Vol. 11
·期 2
·130
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IF 4.106
Chabi Noël Worou,Jing Kang,Jimin Shen,Pengwei Yan,Weiqiang Wang,Yingxu Gong,Zhonglin Chen
A defect-free, loose, and strong layer consisting of zirconium (Zr) nanoparticles (NPs) has been successfully established on a polyacrylonitrile (PAN) ultrafiltration substrate by an in-situ formation process. The resulting organic–inorganic nanofiltration (NF) membrane, NF-PANZr, has been accurately characterized not only with regard to its properties but also its structure by the atomic force microscopy, field emission scanning electron microscopy, and energy dispersive spectroscopy. A sophisticated computing model consisting of the Runge–Kutta method followed by Richardson extrapolation was applied in this investigation to solve the extended Nernst–Planck equations, which govern the solute particles’ transport across the active layer of NF-PANZr. A smart, adaptive step-size routine is chosen for this simple and robust method, also known as RK4 (fourth-order Runge–Kutta). The NF-PANZr membrane was less performant toward monovalent ions, and its rejection rate for multivalent ions reached 99.3%. The water flux of the NF-PANZr membrane was as high as 58 L · m−2· h−1. Richardson’s extrapolation was then used to get a better approximation of Cl−and Mg2+rejection, the relative errors were, respectively, 0.09% and 0.01% for Cl−and Mg2+. While waiting for the rise and expansion of machine learning in the prediction of rejection performance, we strongly recommend the development of better NF models and further validation of existing ones.Keywords:zirconium nanoparticles;soft computing;salt rejection;nanofiltration membrane;Runge–Kutta numerical method;Richardson’s extrapolation
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高影响因子
ANALYTICA CHIMICA ACTA
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2021
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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
危险品化学品经营许可证（带存储）