JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 30
·12221-12235
·
IF 4.5
Lin Huaizhi,Zhang Biao,Xie Wenqi,Wei Zhilei,He Kai,Xia Hongyan,Shi Zhongqi
SiC-B 4 C ceramic skeleton reinforced graphite composites (MCMB/SiC-B 4 C) with extraordinary mechanical performance were fabricated by SPS method. The influence of sintering temperature and volume ratio of B 4 C/SiC on the microstructure and mechanical performance of the composites was studied. With the introduction of B 4 C in the composites, the B atom diffusion at the B 4 C/graphite interface can be activated when the sintering temperature exceeded 1700 °C, which can significantly improve the interfacial combination of the skeleton reinforcement and graphite matrix. Therefore, the relative density and mechanical properties of the composites can be improved. While the sintering temperature reached 1800 °C and the volume ratio of B 4 C/SiC was 4:6 (the total amount of ceramic reinforcement phase was 40 vol%), the composite exhibited the optimal comprehensive performance with bending strength of 202 MPa and fracture toughness of 3.29 MPa·m 1/2 . These values were 146% and 58% higher, respectively, than those of the composite without B 4 C. The developed graphite matrix composites are expected to be applied to extreme conditions such as high load, high temperature and oxidation environments.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2023
·Vol. 17
·期 5
·5344-5351
·
IF 3.4
Wu Hui
The antioxidative capacity of food is a crucial functional indicator. Conventional methods for measuring antioxidative capacity involve complicated reagents and tedious procedures. In this study, an electrochemical gas-generating technique was proposed for the rapid evaluation of antioxidative activity in liquid food. Dopamine-modified graphene was utilized for surface modification of the battery. DNA damage was employed to evaluate the differences in antioxidative capacity among various samples. Three different varieties of wine were compared for their antioxidative activity. The proposed electrochemical sensing strategy was highly effective in testing the antioxidative activity of the three types of wine. The results demonstrated that the antioxidative activity of the three types of wine was ranked as follows: Cabernet Gernischt > Cabernet Sauvignon > Syrah. Additionally, the proposed electrochemical sensor exhibited excellent stability and reproducibility.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Hua Bingyan,Wei Hongliang,Hu Chunwang,Zhang Yaqi,Yang Shuai,Wang Gang,Guo Tao,Li Jingjing
Herein, a semi-interpenetrating network (semi-IPN) hydrogel (SH/PNA) was prepared by simple free radical polymerization using N-isopropylacrylamide and 2-acrylamide-2-methylpropanesulfonic acid as monomers, poly(ethylene glycol) dimethacrylate as a crosslinking agent, and sodium alginate and humic acid as filled biomolecules. Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and rheometer were used to characterize the structure and properties of the samples. The effect of feeding ratios on the gel mass fraction and swelling properties of the SH/PNA hydrogel was explored to optimize its preparation conditions. The swelling behavior under different pH and temperatures was investigated. The experimental result showed that the SH/PNA hydrogel had excellent water absorption capacity and pH/temperature dual responsiveness. Moreover, SH/PNA hydrogel was used as a carrier of urea to prepare slow-release and water-retention fertilizer by in situ loading method, and slow-release properties of urea in water and soil were measured. Taking into account its good ability for controlled release and water retention, the WSRF was expected to be a promising low-cost, environmentally friendly fertilizer that can be used in agriculture and horticulture.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Gu Zhenhua,Zhang Jingli,Zhang Zijun,Mu Qingxue,Yu Liangchong,Sun Taolei,Shen Lei,Gao Guanbin
The impact of interfacial charge on catalytic performance of supported-metal-cluster (SMC) heterostructures remains unclear, hindering efforts to develop high-performance SMC catalysts. Herein we systematically investigated interfacial charge effects of SMCs using a model system of graphene-supported gold-nanoclusters (AuNCs/rGO) for azo hydrogenation. Three types of SMCs with different interfacial charges were synthesized by anchoring electropositive 2-aminoethanethiol (CSH), amphoteric cysteine (Cys), and electronegative 3-mercaptopropionic-acid (MPA) onto AuNCs/rGO, respectively. All three SMCs exhibited high and selective catalytic activity to azo-hydrogenation in four representative azo dyes. The catalytic activity of Cys@AuNCs/rGO was lower than that of CSH@AuNCs/rGO but higher than that of MPA@AuNCs/rGO. However, the cyclic stability of Cys@AuNCs/rGO was inferior to that of both CSH@AuNCs/rGO and MPA@AuNCs/rGO. Further mechanistic studies revealed that amino ligands modified CSH@AuNCs and Cys@AuNCs agglomerated into large-size gold nanoparticles on rGO surface during catalytic reaction under NaBH 4 action, leading to reduced efficiency and cyclic stability. Conversely, non-amino ligand modified MPA@AuNCs only partially detached from rGO surface without agglomeration, resulting in better cyclic stability. Protection of amino groups in ligands such as modifying -NH 3 + group in Cys into imine to form N-isobutyryl-L-cysteine (NIBC) substantially improved the cyclic stability while maintaining the high activity in the NIBC@AuNCs/rGO catalyst system. Our work provides an approach for developing a highly-active and stable SMC heterostructure catalyst via manipulating interfacial charges in SMC.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Xue Yanrong,Zhao Jiwu,Huang Liang,Lu Ying-Rui,Malek Abdul,Gao Ge,Zhuang Zhongbin,Wang Dingsheng,Yavuz Cafer T.,Lu Xu
Ruthenium dioxide is the most promising alternative to the prevailing but expensive iridium-based catalysts for the oxygen evolution reaction in proton-exchange membrane water electrolyzers. However, the under-coordinated lattice oxygen of ruthenium dioxide is prone to over-oxidation, and oxygen vacancies are formed at high oxidation potentials under acidic corrosive conditions. Consequently, ruthenium atoms adjacent to oxygen vacancies are oxidized into soluble high-valence derivatives, causing the collapse of the ruthenium dioxide crystal structure and leading to its poor stability. Here, we report an oxyanion protection strategy to prevent the formation of oxygen vacancies on the ruthenium dioxide surface by forming coordination-saturated lattice oxygen. Combining density functional theory calculations, electrochemical measurements, and a suite of operando spectroscopies, we showcase that barium-anchored sulfate can greatly impede ruthenium loss and extend the lifetime of ruthenium-based catalysts during acidic oxygen evolution, while maintaining the activity. This work paves a new way for designing stable and active anode catalysts toward acidic water splitting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-10
·
IF 5.7
Nie Qingling,Zhang Bohan,Li Rong,Yang Yixuan,Ren Junjie,Qiu Liting,Lu Yudong,Zhu Lanjin,Shen Huiying,Liu Yunzhen,You Ruiyun
A highly sensitive tumor necrosis factor α (TNF-α) detection method based on a surface-enhanced Raman scattering (SERS) magnetic patch sensor is reported. Magnetic beads (MNPs) and core shells were used as the capture matrix and signaling probe, respectively. For this purpose, antibodies were immobilized on the surface of magnetic beads, and then Au@4-MBN@Ag core–shell structures coupled with aptamers and TNF-α antigen were added sequentially to form a sandwich immune complex. Quantitative analysis was performed by monitoring changes in the characteristic SERS signal intensity of the Raman reporter molecule 4-MBN. The results showed that the limit of detection (LOD) of the proposed method was 4.37 × 10 −15 mg·mL −1 with good linearity ( R 2 = 0.9918) over the concentration range 10 −12 to 10 −5 mg·mL −1 . Excellent assay accuracy was also demonstrated, with recoveries in the range 102% to 114%. Since all reactions occur in solution and are separated by magnetic adsorption of magnetic beads, this SERS-based immunoassay technique solves the kinetic problems of limited diffusion and difficult separation on solid substrates. The method is therefore expected to be a good clinical tool for the diagnosis of the inflammatory biomarker THF-α and in vivo inflammation screening. Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biochar
·
2023
·Vol. 5
·期 1
·1-14
·
IF 12.7
Chen Chao,Sun Kang,Huang Chen,Yang Mengmei,Fan Mengmeng,Wang Ao,Zhang Gaoyue,Li Bei,Jiang Jianchun,Xu Wei,Liu Junli
The structural reconstruction mechanism of lignin and cellulose-derived biochars during direct graphitization under ultra-high temperatures was intensively investigated. It was demonstrated that cellulose-derived char was almost composed of carbon microcrystallites, whereas lignin-derived char reserved some of its skeleton structures, and such structural difference played a vital role in the morphology of formed graphitic layers. The results illustrated that the graphitized lignin-derived sample under 2800 ℃ had graphitic degree of 89.53%, interlayer spacing of 0.3363 nm and electronic conductivity of 104.6 S cm −1 , while cellulose-derived sample had graphitic degree of 76.74%, layer distance of 0.3374 nm, and electronic conductivity of only 48.8 S cm −1 . Combined with the results of structural analysis of the chars derived from lignin and cellulose, it was inferred that the stable and aromatic ring containing skeleton structure in lignin was beneficial to the ring-enlarging reconstruction and the formation of large areas of continuous graphitic layers during graphitizing process, leading to high electronic conductivity. Meanwhile, the interwoven microcrystallites in cellulose-derived char strongly restricted the expanding of continuous lamellar graphitic areas even at such ultra-high temperature, causing the formation of turbostratic structure with numerous structural defects as well, and finally resulting in relatively lower electronic conductivity. This work is expected to provide theoretical guidance for preparing high-performance functional carbon materials from lignocellulosic biomass. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 44
·99830-99841
·
IF 5.8
Chen Yanzhu,Zeng Zheng,Liu Dongyang,Zhang Jing,Guo Yang,Zou Jianwu,Guan Juan,Xu Xiang,Li Liqing
Abstract The controllable preparation of efficient non-crystalline solid solution catalysts is a great challenge in the catalytic oxidation of volatile organic compounds. In this work, series non-crystalline solid solution structured Ce-Mn co-oxide nanofibers were creatively prepared by adjusting Ce/Mn molar ratios using electrospinning. 0.20CeMnO x (the ratio of Ce to Mn was 0.2) displayed an outstanding low-temperature toluene oxidation activity ( T 90 = 233 °C). The formation of the amorphous solid solution and the unique nanofiber structure both contributed to a large specific surface area ( S = 173 m 2 g -1 ) and high adsorbed oxygen content (O ads /O = 41.3%), which enhanced the number of active oxygen vacancies. The synergies between non-crystalline structure and active oxygen species markedly improved oxygen migration rate as well as redox ability of the catalysts. Additionally, in situ diffuse reflectance infrared Fourier transform spectra showed that the absorbed toluene could be completely oxidized to CO 2 and H 2 O with benzyl alcohol, benzaldehyde, benzoic acid, and maleic anhydride as intermediates. In summary, this study provided an alternative route for the synthesis of non-crystalline metal co-oxide nanofibers. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-16
·
IF 26.6
Wu Fushuo,Hu Peiying,Hu Feiyue,Tian Zhihua,Tang Jingwen,Zhang Peigen,Pan Long,Barsoum Michel W.,Cai Longzhu,Sun ZhengMing
Curving 2D MXene into 1D nanofibers can effectively stop the restacking of MXene flakes, and then the nanofibers are used to construct a lightweight and multifunctional MXene/C aerogel.
The MXene/C aerogels achieved an RL min of − 53.02 dB and EAB of 5.3 GHz. The radar cross-sectional reduction value of MXene/C aerogels can reach 12.02 dB m 2 .
Integrating multiple functions such as thermal insulation, sensing, and microwave absorption into one material—MXene/C aerogel.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 9
·1-10
·
IF 2.8
Shi Han,Hu Chuanzhi,Li Aoqi,Lin Xuewei,Deng Mingyu,Jiang Bo,Xiao Bo
Carboxymethylchitosan (CMCS) was prepared in a strong alkaline mixture system of isopropyl alcohol and water, and the substitution degrees of carboxymethylation on -OH and –NH 2 groups of chitosan were 58% and 5%, respectively. A series of hydrogels were obtained by mixing 1 wt%-5 wt% aqueous solution of CMCS with aldehyde-4-arm polyethylene glycol (4r-PEG-CHO) and ZnCl 2 at room temperature at pH=6. The presence of a chemical and physical cross linker in the same time, 4r-PEG-CHO and ZnCl 2 , enhanced the mechanical properties of hydrogels and the storage modulus of the gels reached up to 1562 Pa. This may be due to a synergistic effect of imine bonds, metal coordination and hydrogen bonding. The hydrogels exhibited good injectability, pH sensitivity and rapid self-healing ability. Macroscopic observation and dynamic rheological results showed that the hydrogels could self-heal within 1 min after being damaged. This novel rapid self-healing injectable hydrogel has potential applications in the field of biomedicine.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Yang,Ma Hairun,Li Qianwei,Yan Guangxu,Guo Shaohui
Ti/SnO 2 -Sb electrodes possess high catalytic activity and efficiently degrade nitrobenzene (NB); however, their low service life limits their wide application. In this study, we used one-step hydrothermal synthesis to successfully prepare Pt-Nd co-doped Ti/SnO 2 -Sb nanosphere electrodes. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were applied to characterize the surface morphology, microstructure, and chemical composition of the electrodes, respectively. The electrochemical activity and stability of the electrodes were characterized via linear sweep and cyclic voltammetry, electrochemical impedance spectroscopy, and an accelerated service life test; their performance for NB degradation was also studied. An appropriate amount of Pt-Nd co-doping refined the average grain size of SnO 2 and formed a uniform and compact coating on the electrode surface. The oxygen evolution potential, total voltammetric charge, and electron transfer resistance of the Ti/SnO 2 -Sb-Nd-Pt electrodes were 1.88 V, 3.77 mC/cm 2 , and 11.50 Ω, respectively. Hydroxy radical was the main active radical species during the electrolytic degradation of nitrobenzene with Ti/SnO 2 -Sb-Nd-Pt. After Pt-Nd co-doping, the accelerated service life of the electrodes was extended from 8.0 min to 78.2 h (500 mA/cm 2 ); although the NB degradation rate decreased from 94.1 to 80.6%, the total amount of theoretical catalytic degradation of NB in the effective working time increased from 17.4 to 8754.1 mg/cm 2 . These findings reveal good application potential for the electrodes and provide a reference for developing efficient and stable electrode materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-20
·
IF 10.2
Dong Lanlan,Huang Can,Zhao Baohua,Hu Guangyun,Huang Yong,Zhang Xiaorong,Hu Xiaohong,Wang Ying,XiaoyanSun,Qian Wei,Luo Gaoxing
Suppressing persistent multidrug-resistant (MDR) bacterial infections and excessive inflammation is the key for treating chronic wounds. Therefore, developing a microenvironment-responsive material with good biodegradability, drug-loading, anti-infection, and anti-inflammatory properties is desired to boost the chronic wounds healing process; however, using ordinary assembly remains a defect. Herein, we propose a pH/enzyme dual-responsive polymyxin B (PMB) spatiotemporal-release hydrogel (GelMA/OSSA/PMB), namely, the amount of OSSA and PMB released from GelMA/OSSA/PMB was closely related the wound pH and the enzyme concentration changing. The GelMA/OSSA/PMB showed better biosafety than equivalent free PMB, owing to the controlled release of PMB, which helped kill planktonic bacteria and inhibit biofilm activity in vitro. In addition, the GelMA/OSSA/PMB exhibited excellent antibacterial and anti-inflammatory properties. A MDR Pseudomonas aeruginosa caused infection was effectively resolved by the GelMA/OSSA/PMB hydrogel in vivo, thereby significantly boosting wound closure during the inflammatory phase. Furthermore, GelMA/OSSA/PMB accelerated the sequential phases of wound repair.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）