WEAR
·
2021
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IF 3.892
Tiancheng Ouyang,Wenwu Lei,Wentao Tang,Yudong Shen,Chunlan Mo
The development of eco-friendly lubricant is the requirement of the times. In this paper, the modified IF-WS 2 nanoparticles are added to castor oil as additives to prepare mixed lubricant. The lubrication performances of the mixed oil are investigated by ball-on-disc rotary friction tester, and then the surface scratches are characterized by depth of field digital microscope, scanning electron microscope and Raman spectrometer. Experiments reveal that compared with the base oil, the friction coefficient and worn volume decrease by 27.4% and 47.2% after adding modified IF-WS 2 as additives under 300 rpm and 5 N conditions, respectively. From mechanism analysis, this improvement in lubrication performance is attributed to the polarity of castor oil and the unique pressure bearing structure and dispersion stability of modified IF-WS 2 , which makes that the castor oil molecules can better adsorb around the modified IF-WS 2 to form heavy loading bearing friction oil film so as to reduce friction and wear. In summary, results indicate the mixture of modified IF-WS 2 nanoparticles and vegetable lubricating oil has an attractive prospect in the field of environmentally-friendly products.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 20
·6108
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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
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 38
·21695-21702
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IF 12.732
Xiaojie Shen,Guangyu Zhao,Xianbo Yu,Huihuang Huang,Ming Wang,Naiqing Zhang
Undesirable lithium dendrite growth limits the application of lithium metal anodes in high-energy storage batteries. Here, multifunctional SnSe–C composite modified 3D scaffolds are constructed to achieve dendrite-free lithium deposition. During the initial lithiation stage, the porous SnSe–C composite converts into a Li–Sn alloy and Li2Se by lithium reduction. The lithiophilic Li–Sn alloy exhibits a low nucleation barrier and realizes homogeneous lithium nucleation. The reductive product Li2Se with a high ionic conductivity facilitates lithium ion transport, which helps realizing the homogeneous lithium ion flux and reducing concentration polarization. Benefitting from the synergistic effect of the Li–Sn alloy and Li2Se, the Li/SnSe–C anode exhibits an ultralong lifespan over 1100 h with a low overpotential of 18 mV. In full-cell configurations with LiFePO4 cathodes, the Li/SnSe–C anode demonstrates enhanced rate capability and cycle stability with a high-capacity retention of 85% over 750 cycles. This work prepares multifunctional SnSe–C composite modified 3D scaffolds to regulate lithium nucleation and transport, which offers new insights and opportunities for developing dendrite-free lithium metal battery technology.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
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IF 3.178
Yuqi Su,Songtao Cao,Taotao Zhan,Maogang He,Ying Zhang
The mutual diffusion coefficients of dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary systems were measured at temperatures from 288.15 K to 318.15 K with the mass fraction of dimethyl carbonate from 0.05 to 0.95 under atmospheric pressure. All the mutual diffusion coefficients we reported are Fick diffusion coefficients, which were measured by the digital holographic interferometry. The expanded relative uncertainty for the measured mutual diffusion coefficients is estimated to 2.4% with the level of confidence of 0.95 (coverage factor k = 2). Moreover, a theoretical model (UNIDIF) of mutual diffusion coefficients for dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary mixtures was given by fitting the experimental results, and the adjustable parameters and infinite dilution diffusion coefficients of these two solutions were given. The influences of temperature and composition on the mutual diffusion coefficients were discussed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yongqian Cui,Zipeng Xing,Meijun Guo,Yalu Qiu,Bin Fang,Zhenzi Li,Shilin Yang,Wei Zhou
A hollow core–shell potassium phosphomolybdate (KMoP)@cadmium sulfide (CdS)@bismuth sulfide (Bi 2 S 3 ) Z-scheme tandem heterojunction is fabricated by a simple hydrothermal strategy and kept in a water bath to continue the reaction. At the same time, the ternary structure combined Keggin-type polyoxometalate with two photosensitive sulfide semiconductors to form a stable hollow core–shell heterojunction. KMoP@CdS@Bi 2 S 3 with a narrow band gap of ∼ 1.2 eV also has excellent photothermal performance, which may further promote photocatalytic efficiency. The hollow core–shell KMoP@CdS@Bi 2 S 3 tandem heterojunction shows excellent H 2 production performance, Cr VI reduction ability and photocatalytic degradation performance of highly toxic tetracycline (TC). Under visible light irradiation , the photocatalytic H 2 generation rate of the KMoP@CdS@Bi 2 S 3 tandem heterojunction reaches 831 μmol h −1 , which is 103 times higher than that of pristine KMoP. The photocatalytic reduction efficiency of Cr VI and degradation efficiency of TC are as high as 95.5 and 97.51%, ∼4 times higher than that of KMoP. The boosted photocatalytic performance can be ascribed to the formation of core–shell Z-scheme tandem heterojunctions favoring spatial charge separation and the narrow band gap, which extends the photoresponse to visible light/NIR regions. When TC and Cr VI exist at the same time, the reduction efficiency of Cr VI can be as high as 99.64% because the intermediate of TC degradation can promote the reduction of Cr VI . In addition, the photocatalytic performance of the KMoP@CdS@Bi 2 S 3 heterojunction remains nearly constant after 4 recycles, which indicates high stability. The design strategy may provide new insights for preparing other high-performance core–shell tandem heterojunction photocatalysts for solar energy conversion .
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高影响因子
Foods
·
2021
·Vol. 10
·期 11
·2857
·
IF 4.35
Wenfei Tian,Jingyang Tong,Xiaoyue Zhu,Philipp Fritschi Martin,Yonghui Li,Zhonghu He,Yan Zhang
The health benefits from consumption of whole wheat products are widely recognized. This study investigated the effects of different pilot-scale milling methods on physicochemical properties, bioactive components, Chinese steamed bread (CSB), and Chinese leavened pancakes (CLP) qualities of whole wheat flour (WWF). The results indicated that WWF-1 from the reconstitution of brans processed by a hammer mill had the best CSB and CLP quality overall. WWF from entire grain grinding by a jet mill (65 Hz) contained the highest concentration of bioactive components including dietary fibers (DF) and phenolic acids. A finer particle size did not necessarily result in a higher content of phenolic antioxidants in WWF. DF contents and damaged starch were negatively correlated with CSB and CLP quality. Compromised reduced quality observed in CLP made from WWF indicated its potentially higher acceptance as a whole-grain product.Keywords:milling methods;dietary fiber;phenolic acid;steamed bread;leavened pancake
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ACS Sustainable Chemistry & Engineering
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2021
·
IF 8.198
Xiaomin Qiu,Yajuan Qu,Mengjing Zhou,Yangyang Liu,Zhaoyou Zhu,Yinglong Wang,Jingwei Yang
Extractive distillation is often used to separate difficult separation systems so as to realize the recovery and utilization of resources in industry. Based on the separation of ethylene glycol (EG), isoamyl alcohol, and water, the separation of ternary azeotropic mixtures by extractive distillation was studied. The study of extraction mechanism is very important for solvent screening and molecular design. To compare the selectivity of solvents, the interaction energies between solvent–water, solvent–EG, and solvent–isoamyl alcohol were calculated by the quantum chemical method. Atoms in molecules, reduced density gradient, and electrostatic potential were used to study the microextraction mechanism of solvents in the water–EG–isoamyl alcohol system. In extractive distillation, vapor–liquid equilibrium (VLE) data is used as the basic data for designing and optimizing the process. In order to solve the problem of lack of VLE data between N,N-dimethylformamide, dimethyl sulfoxide, choline-based deep eutectic solvents, and azeotropes, the VLE experiment of the solvent and azeotrope system was carried out. In this work, the selectivity of different solvents was compared by the quantum chemical method, the microextraction mechanism of solvents was explored, and the lack of VLE experimental data was supplemented, which provided theoretical guidance for the selection and design of solvent molecules with excellent performance.
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OPTICAL FIBER TECHNOLOGY
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2021
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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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FOOD CHEMISTRY
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2021
·
IF 7.514
Saili Zhang,Xiangjun Fang,Weijie Wu,Chuan Tong,Hangjun Chen,Hailong Yang,Haiyan Gao
Fresh shiitake ( Lentinus edodes ) is prone to brown, pileus-opening and flavor-loss during storage. Therefore, it is important to find an effective preservation method for fresh shiitake. Negative air ions (NAI) are negatively-charged molecules or atoms in the air, and can affect the physiological metabolism of live cells and be conveniently used with low cost. In this study, NAI treatment was performed at different times and the physico-chemical characteristics, microstructure, membrane potential and energy metabolism of shiitake were determined during storage. Results showed that NAI treatment for 40 min could reduce 29% of browning index and maintain the hardness of shiitake. NAI treatment groups had higher content of sweetness amino acids, umami amino acids, 5′-IMP, eight-carbon alcohols compounds and cyclic sulfides compounds than the control, and comprehensive quality of the group being treated for 40 min was the best. The mitochondria of shiitake swelled and the membrane potential decreased after being treated by NAI. However, NAI treatment for 40 min could improve the contents of ATP and ADP, maintain a relatively stable energy charge level, and promote energy utilization of shiitake during storage. The results demonstrated that NAI treatment had the potential to improve the quality shiitake during storage.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Pengchao Si,Mengqi Li,Xiang Wang,Feifei Sun,Jingjing Liu,Qinhuan Wang,Fuqiang Ren,Haoran Kong,Yu Wang
The energy conversion process caused by relative motion of droplets and nanofilms has aroused widespread attention. However, the mechanism is still unclear, especially regarding the modification of the nanomaterial itself. In this study, we found that by annealing TiO2 in a H2 atmosphere at different temperatures, the Magnéli phase titanium suboxide can be prepared with a lot of oxygen vacancies. Oxygen vacancies not only form negative charge centers inside the film, which enhance the attraction of Na+, but also increase the carrier concentration. By increasing the oxygen vacancy concentration, the measured VOC value was increased by ∼5 times and ISC by ∼30 times. Furthermore, a universal film preparation process was developed for the large-scale production of flexible energy conversion units based on the simple sol–gel method. Experimental results show that the prepared energy conversion unit has excellent performance of collecting rainwater energy and show a stable and continuous VOC output of ∼600 mV, combined with the surface hydrophobic treatment technology.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yuxuan Zhao,Lingzhi Nie,Hongli Yang,Kai Song,Huilin Hou
In present work, we report the fabrication of mesoporous TiO 2 /In 2 O 3 nanofibers photocatalyst via the combination of electrospinning and hydrothermal method , in which In 2 O 3 were uniformly grown on electrospun TiO2 nanofibers. The mass loading of In 2 O 3 nanostructures and mesoporous nanostructure could be easily controlled by adjusting raw materials weight of In 2 O 3 within the hydrothermal solutions. The as-prepared photocatalyst were also employed to study their photocatalytic performance for organic decomposition. It is found that TiO 2 /In 2 O 3 composites showed significantly enhanced photocatalytic efficiency as compared to that of pristine TiO 2 and In 2 O 3 photocatalysts for RhB degradation. The enhanced performance could be attributed to the combined effects of the extended visible-light response range, efficient separation of photo-excited charge carriers and increased reaction active sites.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Chun Pei,Pi-yu Chen,Si-Cheng Kong,Junlin Wu,Ji-Hua Zhu,Feng Xing
Chemical swelling and electrochemical oxidation are combined to realize the separation and recovery of carbon fibers from carbon fiber-reinforced plastic (CFRP) in dimethyl sulfoxide (DMSO) at normal temperature and pressure. The results showed that the depolymerization rate of epoxy resin in CFRP increased with increasing ammonium acetate concentration and current density, and the influence of the current density was more significant than that of the concentration. Microscopic analysis showed that the recycled carbon fibers had few residual resin on their surfaces and mild electrochemical oxidation etching, and recycled carbon fiber monofilament achieved a tensile strength and an interfacial shear strength that were 93.55% and 118.76% those of the original fibers.
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