JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 4
·759-765
·
IF 1.6
Zhao Dongsheng,Jing Qiang,Sun Jianwei,Zhang Jinyong
The Si 3 N 4 /SiC gradient material with a gradient composition structure was prepared by a hot pressing sintering. The sinterability, distribution of residual stress and the effect of residual stress on mechanical properties of Si 3 N 4 /SiC gradient materials were studied. The research results show that, at 1 750 °C, Si 3 N 4 /SiC gradient materials with different ratios can achieve co-sintering, and the overall relative density of the sample reaches 98.5%. Interestingly, the flexural strength of Si 3 N 4 /SiC gradient material is related to its loading surface. The flexural strength of SiC as the loading surface is about 35% higher than that of Si 3 N 4 as the loading surface. The analysis of the residual stress of the material in the gradient structure shows that the gradient stress distribution between the two phases is a vital factor affecting the mechanical properties of the material. With the increase of SiC content in the gradient direction, the fracture toughness of each layer of Si 3 N 4 /SiC gradient materials gradually decreases. The surface hardness of the pure SiC side is lower than that reported in other literature.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 10
·728
·
IF 2.5
Xue Lisha,Gao Zhan,Wang Yuan,Mao Qianhui,Yan Zhanheng
The prototype phonon-liquid electron-crystal β-Cu 2 Se has been recognized as one of the top-performing thermoelectric materials due to its ultralow lattice thermal conductivity (κ ). This paper reports the synthesis of Telluride-doped Bi 0.001 Cu 2 Se through the combination of ball milling and spark plasma sintering. The thermoelectric properties of the materials, encompassing electrical resistivity, Seebeck coefficient, and thermal conductivity within the temperature range of 300 K to 873 K, have been evaluated. The Bi 0.001 Cu 2 Se 0.90 Te 0.10 sample exhibited a peak Seebeck coefficient of 192.6 μV/K, which is approximately 23.5% higher than that of the bulk Bi 0.001 Cu 2 Se alloy. Both Bi 0.001 Cu 2 Se and Bi 0.001 Cu 2 Se 0.90 Te 0.10 demonstrated comparable high power factors of 1221.9 μWm − 1 K − 2 and 1223.6 μWm − 1 K − 2 , attributed to their moderate electronic conductivity and Seebeck coefficient. The porous Bi 0.001 Cu 2 Se 0.80 Te 0.20 samples exhibited a minimum thermal conductivity of 0.61 − 1 K − 1 at 873 K, representing a reduction of up to 21.8% compared to the bulk Bi 0.001 Cu 2 Se alloy. This decrease in thermal conductivity can be attributed to the boundaries and defects formed during the spark plasma sintering process, as well as the porous nature of the samples. The figure of merit for the Bi 0.001 Cu 2 Se 0.80 Te 0.20 was found to have a maximum value of approximately 1.49 at 873 K, primarily due to its significantly lower thermal conductivity.
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BMC MICROBIOLOGY
·
2015
·Vol. 15
·期 1
·171
·
IF 2.729
Wan Lei,Luo Gang,Lu Haibin,Xuan Dongying,Cao Hong,Zhang Jincai
Background Hemolysins are crucial virulence factors which help pathogens to survive and persist in the host. This study investigated whether common electrolytes will affect the hemolysins of Candida species. The hemolysins from 25 Candida isolates were investigated using a plate specially designed for Candida species in the presence of three electrolytes, CaCl 2 , NaCl and KCl, at different concentrations. The hemolytic activity was determined after 48 h and the hemolytic index was calculated. Results All three electrolytes caused a decrease in the hemolytic activity. Significant differences existed between varying concentrations of NaCl, while no significant differences existed for the CaCl 2 and KCl groups. Additionally, the peripheral hemolytic index was highly correlated with the hemolytic index ( r = 0.656, p < 0.001). Conclusions Our findings indicate that electrolytes reduce hemolysis by Candida species and a correlation exists between the peripheral hemolytic index and the translucent hemolytic index.
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Alzheimers Research & Therapy
·
2024
·Vol. 16
·期 1
·167
·
IF 7.9
Knapskog Anne-Brita,Edwin Trine Holt,Ueland Per Magne,Ulvik Arve,Fang Evandro Fei,Eldholm Rannveig Sakshaug,Halaas Nathalie Bodd,Giil Lasse M.,Saltvedt Ingvild,Watne Leiv Otto,Aksnes Mari
Background Sex differences in neuroinflammation could contribute to women’s increased risk of Alzheimer’s disease (AD), providing rationale for exploring sex-specific AD biomarkers. In AD, dysregulation of the kynurenine pathway (KP) contributes to neuroinflammation and there is some evidence of sex differences in KP metabolism. However, the sex-specific associations between KP metabolism and biomarkers of AD and neuroinflammation need to be explored further. Methods Here we investigate sex differences in cerebrospinal fluid concentrations of seven KP metabolites and sex-specific associations with established AD biomarkers and neopterin, an indicator of neuroinflammation. This study included 311 patients with symptomatic AD and 105 age-matched cognitively unimpaired (CU) controls, followed for up to 5 years. Results We found sex differences in KP metabolites in the AD group, with higher levels of most metabolites in men, while there were no sex differences in the CU group. In line with this, more KP metabolites were significantly altered in AD men compared to CU men, and there was a trend in the same direction in AD women. Furthermore, we found sex-specific associations between kynurenic acid and the kynurenic acid/quinolinic acid ratio with neopterin, but no sex differences in the associations between KP metabolites and clinical progression. Discussion In our cohort, sex differences in KP metabolites were restricted to AD patients. Our results suggest that dysregulation of the KP due to increased inflammation could contribute to higher AD risk in women.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2015
·Vol. 122
·期 1
·329-338
·
IF 2.042
Bu Jiang,Liang Hongbo,Zhang Dandan,Xiong Lei,Huang Shengmei
N , N′ -bis(2,4-di(acryloyloxyethyl)-[1,3,5]-triazin-2-yl)-hexane-1,6-diamine(BDAETH) and 2,2-dimethyl-1,3-propanediol glycerol-methacrylate phosphate (PGMH) were synthesized from cyanuric chloride and phosphorus oxychloride. BDAETH and PGMH were further blended in different ratios to prepare UV-curable intumescent flame-retardant coatings. The thermal behaviors of their cured films were studied by thermal gravimetric analysis, and the results showed that degradation process of cured blend films could be divided into three degradation regions. The degradation mechanism was further investigated by in situ Fourier transform infrared spectra. The flame-retardant properties and the expansion process of the intumescent flame-retardant coatings were further monitored by limiting oxygen index and a self-made equipment, which indicated the synthetic effect between BDAETH and PGMH.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14274-14285
·
IF 2.478
Gao Qianqian,Dai Yuqiang,Wei Xile,Zhou Changping,Gong Wenfeng,Song Haixiang,Guo Zhanhu,Li Chengbo
The Aurivillius compound Pb x Bi 6− x Fe 0.5 Co 0.5 Ti 4 O 18 thin films were prepared via chemical solution deposition method and the influence of Pb 2+ ions doping on the structure, ferroelectric and leakage properties were studied. With the increasing concentration of Pb 2+ ions, the lattice distortion is increased and the growth of the films along ab plane is promoted. The calculation results show that the internal stress of the films increases with the increase of Pb 2+ concentration. For the samples with low Pb 2+ doping concentration ( x < 0.6), the leakage current densities are also decreased, which can be attributed to the decrease in oxygen vacancy concentration. Due to the enhanced lattice distortion and decreased leakage current densities, the ferroelectric properties are improved. The film with x = 0.2 has a high saturation polarization of 42.3 µC/cm 2 . According to the fitting results, the leakage conduction mechanism is attributed to the combined effect of space-charge-limited conduction mechanism and ionic conduction mechanisms.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
铁电学
·
薄膜制备
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 13
·1096
·
IF 2.8
Gu Wen,Liu Bingguo,Li Shunzi,Hu Baofu,Xu Jian,Wang Jian,Du Baoli
Cu 2 SnS 3 (CTS), as a potential thermoelectric (TE) material, the electrical and thermal transport properties are heavily determined by its original phase structure and the following phase evolution upon heating. Unlike previous studies that induced CTS phase transition by doping, this study used mechanical alloying powder as the precursor and successfully prepared phase-pure cubic (c-) and monoclinic (m-) CTS samples, as well as two-phase mixed samples with different percentage composition of c-CTS and m-CTS, by simply adjusting the hot pressing temperature. Firstly, phase structures of hot-pressed specimens were determined and confirmed by XRD refinement, SEM, TEM, and Raman spectroscopy. Secondly, thermodynamic property was analysis by DSC analysis, and phase evolution was detailed by analyzing specimens quenched at various temperatures. Then, the electrical and thermal transport properties were measured up to 500 °C, and were correlated with phase evolution analyzed above. Benefiting from cationic disorder, a maximum zT of 0.42 at 500 °C was achieved in c-CTS samples hot-pressed at 575 °C. The phase evolution of CTS was comprehensively investigated by using high-quality samples. The results indicate that phase transition is the potential mechanism for the doping effect in most studies, providing some guidance for improving the performance of environmentally friendly TE sulfides.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
能源材料
·
热电转换
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IONICS
·
2016
·Vol. 22
·期 11
·2225-2233
·
IF 2.119
Lu Juanjuan,Liu Yuelin,Liu Xinhe,Lu Xiaoquan,Liu Xiuhui
In this article, we constructed an electrochemical sensor for highly sensitive determination of β-nicotinamide adenine dinucleotide (NADH) using the poly(diallyldimethylammonium chloride)-functionalized reduced graphene oxide nanocomposite modified electrode (PDDA-rGO/GCE). The nanocomposite was characterized by transmission electron microscopy, Fourier transform-infrared spectrometry, ultraviolet-visible absorption spectrometry, cyclic voltammetry, and electrochemical impedance spectroscopy. The experimental results demonstrated that the fabricated sensor exhibited excellent electrocatalytic activity on the oxidation of NADH with a decreased about 200 mV in overpotential and 5.0-fold increment in the oxidation peak current compared to a bare GCE. Applying cyclic voltammetry, a wide linear range from 1.0 × 10 −7 to 2.9 × 10 −3 M with low limit of detection (LOD) of 3.4 × 10 −8 M and high sensitivity of 463.3 μA mM −1 cm −2 were obtained, which was superior to other NADH electrochemical sensors reported previously. Furthermore, the fabricated NADH sensor possessed excellent selectivity, reproducibility, and stability. The oxidation mechanism of NADH at the PDDA-rGO/GCE was also discussed in detail.
A simple NADH sensing platform based on PDDA-rGO composite is constructed, which exhibits an ultra-low detection limit ( 3.4×10-8 M) towards the oxidation of NADH, and the electrochemical reaction mechanism of NADH is discussed in detail.
研究领域:
生物电化学
·
生物传感器
·
纳米生物技术
·
分子诊断
·
转化医学
·
电分析化学
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IONICS
·
2018
·Vol. 25
·期 1
·241-251
·
IF 2.347
Wen Xinge,Dong Tao,Liu Ao,Zheng Shuohang,Chen Shimou,Han Yifan,Zhang Suojiang
As a polymer host, one polymeric ionic liquid poly(methyl methacrylate-1-vinyl-3-ethyl-imidazolium bis(trifluoromethylsulfonyl) imide) (abbr. P(MMA-co-VEImTFSI)) was successfully synthesized and characterized. Four poly(vinylidene fluoride-co-hexafluoropropylene) (abbr. PVDF-HFP)-based polymer electrolytes were prepared by blending 0, 5,15, and 25 wt% P(MMA-co-VEImTFSI). The electrochemical performances of the prepared electrolytes were studied carefully. The results revealed that increasing the polymeric ionic liquid content, the ionic conductivity of the polymer electrolytes could be enhanced and it obeyed the Arrhenius rule. The highest ionic conductivity of the polymer electrolytes was up to 2.09 × 10 −3 S cm −1 at room temperature. The polymer with 25 wt% polymeric ionic liquid showed an excellent electrochemical performance for supercapacitor electrolyte. After 2000 cycles, the retention of capacitance in P(MMA-co-VEImTFSI)-based polymer electrolyte was above 80%. It implied that the present P(MMA-co-VEImTFSI) polymeric ionic liquid was a decent component candidate in the high-performance polymer electrolytes.
研究领域:
材料科学
·
电化学
·
高分子化学
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能源存储
·
功能材料
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Science China-Materials
·
2021
·Vol. 65
·期 1
·43-50
·
IF 8.273
Xu Jingyi,Lai Chenling,Duan LiPing,Zhang Yuxuan,Xu Yifan,Bao Jianchun,Zhou Xiaosi
Transition-metal compounds have received extensive attention from researchers due to their high reversible capacity and suitable voltage platform as potassium-ion battery anodes. However, these materials commonly feature a poor conductivity and a large volume expansion, thus leading to underdeveloped rate capability and cyclic stability. Herein, we successfully encapsulated ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers (NCFs) via electrospinning, carbonization, and phosphorization (antimonization). The N-doped carbon fiber prevents the aggregation of nanoparticles, buffers the volume expansion of CoP and CoSb during charging and discharging, and improves the conductivity of the composite material. As a result, the CoP/NCF anode exhibits excellent potassium-ion storage performance, including an outstanding reversible capacity of 335 mA h g −1 , a decent capacity retention of 79.3% after 1000 cycles at 1 A g −1 and a superior rate capability of 148 mA h g −1 at 5 A g −1 , superior to most of the reported transition-metalbased potassium-ion battery anode materials.
研究领域:
材料科学
·
电化学储能
·
纳米材料
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能源化学
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功能纤维材料
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先进电池技术
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2022
·Vol. 44
·期 11
·4191-4200
·
IF 4.898
Kamran Muhammad Aqeel,Bibi Sadia,Chen Baoliang,Jiang Jun,Xu Ren-Kou
The consortium of minerals and organic matter notably alters and affects minerals' surface characteristics and nutrients providence. Organic matter such as biochar can modify the availability status of macronutrients like phosphorus (P). Despite some investigation, the adsorption/desorption of P with pure iron (hydr)oxides and the probable mechanisms involved are still unknown. In the present study, the goethite/hematite or goethite–biochar/hematite–biochar complexes were prepared, and a batch experiment with different P concentrations, time spell, pH, and ionic strength is performed to evaluate the sorption characteristics of P. The results of our study suggest that the P adsorption on mineral surface decreased with the increasing pH. Furthermore, the coexistence of biochar and minerals significantly inhibits P adsorption on the minerals surface. The results of Languimner and Freundlich's equations signify that the biochar–minerals complexes have heterogeneous adsorption sites and the presence of biochar reduces P adsorption on minerals surface. Among four biochars including peanut straw biochar (PC (B1)), rice straw biochar (RC (B2)), canola straw biochar (CC (B3)), and soybean straw biochar (SC (B4)), PC was more effective than other biochars to inhibit P adsorption on minerals surfaces. Graphical abstract
研究领域:
土壤化学
·
环境地球化学
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农业环境科学
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生物地球化学
·
固相界面过程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 5
·67
·
IF 2.325
Li Wenyan,Huo Mengmeng,Sen Chaudhuri Arka,Yang Chen,Cao Dazhong,Wu Zhenghong,Qi Xiaole
Currently, polysaccharide-based hydrogels are widely studied macromolecular networks to modify drug dissolution from controlled-releasing matrix tablets. Among them, polyelectrolyte complexes (PEC) films consisted of chitosan (CS) and sodium alginate (SA) could be obtained via spontaneously assembling under physiological gastrointestinal environment. Here, we utilized these self-assembled PEC films as an efficient coating materials to develop controlled-released matrix tablets through compression coating process, with paracetamol (APAP) as model drug. The constitutive and morphology characteristic studies on these PEC films illustrated that the mixture of CS and SA with the weight ratio of 1:1 would be an promising outer layer for compression-coating tablets. In addition, the in vitro drug releasing behavior experiments demonstrated that the optimized compression coating tablets displayed satisfied zero-order drug releasing profits. Furthermore, the in vivo pharmacokinetic studies of these APAP loaded compression-coated tablets in New Zealand rabbits gave that the T max (12.32 ± 1.05 h) was significantly prolonged ( p < 0.01), compared to that (0.89 ± 0.26 h) of common APAP tablets (Jinfuning ® ) after oral administration. These studies suggest that the compression-coated tablets with self-assembled PEC film as coating outer layer may be a promising strategy for peroral controlled release delivery system of water soluble drugs. Graphical
研究领域:
药剂学
·
生物材料
·
药物递送系统
·
药代动力学
·
胃肠药理学
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危险品化学品经营许可证（带存储）