JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9181-9195
·
IF 4.5
Yu Jiaqi,Li Yuqi,Qin Feng,Lu Shaorong,Yang Chao,Li Yang,Zhou Wei
In this work, 1-aminoethyl-3-methylimidazolium bromide ionic liquid was used to modify the surface of graphene nanosheets (GNs) through “π–π” interaction to achieve good dispersion and conductivity. By introducing ionic liquid-modified graphene nanosheets (IGNs) into the PI matrix, the ultra-lightweight and multifunctional IGNs/PI aerogels were prepared via freeze-drying and thermal imidization. Benefiting from the porous structure and the introduction of conductive IGNs, the IGNs/PI aerogels exhibit excellent electromagnetic wave (EMW) absorption properties, compression properties, thermal insulation properties and thermal stability. Notably, when the volume content of IGNs is 10%, the IGNs/PI-10 aerogels show the best EMW absorption performance with a minimum reflection loss (RL min ) of −24.8 dB at 2.44 mm and an effective absorption bandwidth (EAB) of 3.6 GHz at 3.00 mm. These promising characteristics including excellent EMW absorption, compression properties and thermal insulation endow IGNs/PI aerogels great application prospects as multifunctional EMW absorbers.
Graphical Abstract
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Weijie Jia,Yuqi Su,Songtao Cao,Ao Dong,Ying Zhang,Maogang He
Mutual diffusion coefficients of three alkanes (n-heptane, n-octane and isooctane) in cyclohexane were measured by digital holographic interferometry under atmospheric pressure. The measured temperature points were 288.15 K, 298.15 K and 308.15 K, respectively and the mass fraction of the measured solution range was from 0.05 to 0.95. The extended relative uncertainty of the measurement system was estimated to be less than 2.4%. The dependence of mutual diffusion coefficient on temperature and solution concentration was studied. The mutual diffusion coefficients of these three binary mixtures increase with the increase of temperature and have a nearly linear relationship with the solution concentration. And the image processing process of holographic interference image is introduced in detail. Zhang et al .’s model, Darken model and Vignes model were used to predict the mutual diffusion coefficients of the three binary mixtures, the absolute average of relative deviations (AARDs) are 2.97%, 3.89% and 6.18%, respectively and Zhang et al .’s model is the one with the best agreement among the three models.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yuxin Wang,Gaofeng Zhang,Zhen He,Jiahuan Chen,Wei Gao,Peng Cao
This study investigated the electrodeposition of a three-dimensional nanocone-shaped surface structure on SUS304 stainless steel substrates. Different electrodeposition parameters were adopted to generate nanocone-shaped Ni coatings. A detailed description of the coating microstructure and composition is proposed to understand how Ni nanocones develop throughout electrodeposition. A series of wetting tests compared the superhydrophobicity of the Ni nanocone coating. Wear tests were used to verify their mechanical stability. The best superhydrophobic and mechanical performance is achieved after 25 min electrodeposition, where the newly formed Ni nanocones grow to provide additional air cushion to support surface water droplets and promote wear resistance. The superhydrophobic Ni coating also has good anti-icing properties. Water droplets begin to freeze from the contact points between the water and the sample surface. Surface damage, such as scratches and holes, reduces superhydrophobic samples' anti-icing properties.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Junzhi Liao,Mengyao Xue,Yuankang Bao,Zhengtao Wu,Hao Zhang,Ping Li,Xun Xu,Shuwang Duo
The practical application of NiFe-based materials as high-performance water splitting electrocatalysts is severity restricted by their inferior hydrogen evolution reaction (HER) activity and long-term stability under large current density. Herein, we report a three-dimensional core–shell Ni/NiFe-layered double hydroxide (LDH) Schottky heterojunction on iron foam (Ni/NiFe-LDH/IF) electrode, in which a Ni metal nano-layer was directly deposited on the NiFe-LDH support grown in situ on commercial IF. Such an assembly enhanced the interfacial strength of the Ni/NiFe-LDH/IF electrode, promoted electron transfer and increased the adsorption energy of OH– as proved by density functional theory calculations. Consequently, the ultralow overpotentials (η) of 56 and 277 mV for HER and 140 and 330 mV for the oxygen evolution reaction (OER) resulted in the current densities of 10 and 1000 mA cm–2, respectively. The fabricated Ni/NiFe-LDH/IF two-electrode electrolyzer exhibited excellent water splitting characteristics, which produced the current densities of 10 and 1000 mA cm–2 at cell voltage of only 1.49 and 1.87 V, versus a reversible hydrogen electrode, respectively, which exceeded that of a commercial Pt/C||RuO2 catalyst. Moreover, the Ni/NiFe-LDH/IF electrolyzer demonstrated extremely high stability at 1000 mA cm–2 without a significant decay for more than 1500 h in a 1 M KOH solution and for 250 h at 60 °C in a 6 M KOH solution. This study proposes a scalable and extendable strategy for designing highly efficient and ultrastable electrocatalysts for hydrogen production at an ampere-level current density.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Lei Wang,Ce Xu,Kai Zhang,Xiaojing Liu,Xiao Zhang,Jingde Li
Improving the conversion efficiency of lithium polysulfides (LiPSs) within the interlayer plays a significant role in inhibiting the shuttle effect of polysulfides for lithium-sulfur (Li-S) batteries, and this can be addressed by constructing highly exposed catalytic active sites. Herein, a feather-like interlayer material featured with highly exposed active sites is prepared by combining electrospinning technology and chemical vapor deposition . In the interlayer design, the growth of carbon nanotubes (CNTs) on the nitrogen-doped carbon fiber (N CF) surface greatly exposes the active Co and N-dopant adsorption-catalytic sites and forms a feather-like Co/CNT@N CF composite. The feather-like structure design endows the interlayer with good blockage effect for LiPSs shuttling. Meanwhile, the abundant active catalytic sites can effectively promote the conversion of polysulfides, and thus further suppress the shuttle of LiPSs. The cell with Co/CNT@N CF interlayer achieves excellent discharge performance (901.5 mAh g −1 ) with low capacity decay (0.025% per cycle) after 500 cycles at 1 C. Moreover, the cell exhibits a discharge capacity of 809 mAh g −1 at 5 C and an areal capacity of 5.05 mAh cm −2 under a sulfur loading of 6.9 mg cm −2 . This work offers a facile interlayer design from the perspective of high active sites exposure in Li-S cells.
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ACS Sustainable Chemistry & Engineering
·
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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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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PubMed
高影响因子
Biomedical Optics Express
·
2021
·Vol. 12
·期 12
·7673-7688
·
IF 3.732
Ning Chen,Yanbing Yuan,Ping Lu,Luyao Wang,Xuedian Zhang,Xuedian Zhang,Hui Chen,Pei Ma
Carbamazepine (CBZ) is a commonly used drug for the treatment of
epilepsy. Due to the narrow effective range, CBZ concentration was
usually monitored with blood draw from patients. Frequent blood draw
is inconvenient and causes physical and psychological pain. Therefore,
highly-sensitive, rapid, label-free, and non-invasive drug detection
methods can be alternatives to bring a relief. In this work, we have
proposed a method for the non-invasive detection of CBZ using
surface-enhanced Raman spectroscopy (SERS). Gold-silver core-shell
nanomaterial substrates were prepared and optimized. Salivary CBZ
concentration was measured with SERS as a non-invasive alternative to
blood draw. The results showed that there was a linear relationship
between SERS response and CBZ concentration in the entire measured
range of 10−1 ∼ 10−8 mol/L.
The detection limit of this method was 1.26 ×
10−9 mol/L. Satisfactory repeatability and stability
were also demonstrated. Due to its high sensitivity and ease of
operation, the proposed method can serve as an alternative to blood
draw for non-invasively monitoring CBZ concentration. It also has
great potentials in many other applications of biomedical
sciences.© 2021 Optical Society of America under the
terms of the OSA Open
Access Publishing Agreement
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Green Energy & Environment
·
2021
·
IF 8.207
Ruichang Xue,Mengwei Guo,Zhuoming Wei,Qibo Zhang
Ni–Fe bimetallic electrodes are currently recognized as a kind of benchmark transition metal-based oxygen evolution reaction (OER) electrocatalysts. Facile synthesis of Ni–Fe bimetallic electrode materials with excellent catalytic activity and satisfied stability by a simple and low-cost route is still a big challenge. Herein, well-defined Ni–Fe nanoparticles in-situ developed on a planar Fe substrate (Ni–Fe NPs/Fe) is fabricated via a facile one-step galvanic replacement reaction (GRR) carried out in an Ethaline-based deep eutectic solvent (DES). The prepared Ni–Fe NPs/Fe exhibits outstanding OER performance, which needs an overpotential of only 319 mV to drive a current density of 10 mA cm −2 , with a small Tafel slope of 41.2 mV dec −1 in 1.0 mol L −1 KOH, high mass activity (up to 319.78 A g −1 at an overpotential of 300 mV) and robust durability for 200 h. Impressively, the Ni–Fe bimetallic oxygen-evolution electrode obtained from the Ethaline-based DES is catalytically more active and durable than that of its counterpart derived from the 4.2 mol L −1 NaCl aqueous solution. The reason for this is mainly related to the different morphology and surface state of the Ni–Fe catalysts obtained from these different solvent environments, particularly for the differences in phy–chemical properties, active species formed and deposition kinetics, offered by the Ethaline-based DES.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mengwei Guo,Zhuoming Wei,Qibo Zhang
The rational design and synthesis of highly efficient, precious metal-free electrocatalysts in the promotion of electrochemical water oxidation is essential for the sustainable use of renewable energy. Herein, an integrated, S-doped MnO x /Mn film developed on carbon paper (CP) formed by a two-step transformation approach that includes template-free electrodeposition and in-situ electrochemical oxidation is employed as an efficient oxygen evolution reaction (OER) electrocatalyst. The doping of S and in-situ electro-oxidation lead to a tailored electronic structure and phase composition , which endow the composite electrode with a significantly enhanced OER catalytic performance. This S-doped integrated electrode perfectly combines highly active MnO x outer layers with conductive metallic Mn inner layers to offer abundant catalytic interfaces and electronic paths, leading to favorable reaction kinetics. As a result, the optimal S-doped MnO x /Mn/CP offers a low overpotential of 435 mV at 10 mA cm −2 with a Tafel slope of 89.97 mV dec −1 as well as improved stability. Impressively, a highly intrinsic catalytic activity with a turnover frequency of 0.0112 s −1 is obtained for S-doped MnO x /Mn/CP, which is 4.2-fold higher than that of MnO x /Mn/CP. S doping plays a critical role in stabilizing the Mn III O x active phase and is ultimately responsible for the enhanced catalytic performance. This work provides an integrated design concept and S doping approach suitable for boosting the OER catalytic performance of MnO x .
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Yue-ming Hu,Su-zhen Lu,Ya-si Li,Hui Wang,Yan Shi,Lu Zhang,Zong-cai Tu
The protective effect of antioxidant peptides from grass carp scale gelatin on hydrogen peroxide (H 2 O 2 ) - mediated oxidative injured HepG2 cells was investigated, and the protective mechanism as well as peptide structure were studied. Pretreated with grass carp scale gelatin hydrolysates (GSGH) for 24 h significantly increased the survival rates and decreased the apoptosis rates of H 2 O 2 - mediated oxidative injured HepG2 cells. The increase in SOD, CAT and GPX activities, reduce in ROS level and MDA content, and weaken in damage on cell membrane and DNA could be responsible for the protective effect of GSGH on H 2 O 2 -mediated oxidative injured HepG2 cells. Peptide sequences of GSGH were analyzed by LC-ESI-Q-Orbitrap-MS/MS, and results showed that most of them were low molecular weight peptide at 358–986 Da. Synergistic effect existed among antioxidant peptides and contributed to the strong antioxidant activities of GSGH.
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Sustainable Energy & Fuels
·
2021
·Vol. 6
·期 3
·693-699
·
IF 6.367
Chao Chang,Xiaoyu He,Zhaoyang Han,Lilin Pei,Zongyu Wang,Yulong Ji
Developing energy harvesting and conversion technology is of great significance to mitigate the energy crisis and realize the sustainable development of human society. In this work, we designed and fabricated a thermal energy harvesting and conversion device by integrating a tube-based triboelectric nanogenerator (TENG) into a copper oscillating heat pipe (OHP). The tube-based TENG was composed of two copper electrodes uniformly distributed along a polytetrafluoroethylene (PTFE) tube. The copper OHP with an inner diameter of 2 mm had 6 turns and deionized water (DI) was chosen as the working fluid. When thermal energy was added to the OHP, liquid plugs in the OHP were thermally excited and flowed into the PTFE tube, resulting in the generation of an alternating flow of electrons between the two electrodes. This TENG-OHP system successfully generated more than 7.0 V of open-circuit voltage and more than 0.32 μW of output power. The generated electrical energy can be used to power many small electronics, such as capacitors and light-emitting diodes (LEDs). Therefore, these findings will offer an alternative approach to harvest and convert thermal energy heat in many devices or systems that involve the heat generation and heat transfer process.
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