International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·645-656
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IF 7.2
Wang Long,Liu Jiurong,Xie Shenghui,Deng Yanli,Wang Zhou,Hou Shanyue,Yue Shengying,Wang Gang,Wu Na,Zeng Zhihui
W-type barium–nickel ferrite (BaNi 2 Fe 16 O 27 ) is a highly promising material for electromagnetic wave (EMW) absorption because of its magnetic loss capability for EMW, low cost, large-scale production potential, high-temperature resistance, and excellent chemical stability. However, the poor dielectric loss of magnetic ferrites hampers their utilization, hindering enhancement in their EMW-absorption performance. Developing efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but remains challenging. Here, an efficient strategy substituting Ba 2+ with rare earth La 3+ in W-type ferrite was proposed for the preparation of novel La-substituted ferrites (Ba 1− x La x Ni 2 Fe 15.4 O 27 ). The influences of La 3+ substitution on ferrites’ EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and discussed. La 3+ efficiently induced lattice defects, enhanced defect-induced polarization, and slightly reduced the ferrites’ bandgap, enhancing the dielectric properties of the ferrites. La 3+ also enhanced the ferromagnetic resonance loss and strengthened magnetic properties. These effects considerably improved the EMW-absorption performance of Ba 1− x La x Ni 2 Fe 15.4 O 27 compared with pure W-type ferrites. When x = 0.2, the best EMW-absorption performance was achieved with a minimum reflection loss of −55.6 dB and effective absorption bandwidth (EAB) of 3.44 GHz.
研究领域:
材料科学
·
电磁学
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2023
·
IF 6.4
He Zhang,Guo-Hua Zhang
In this paper, using the ultrafine W-27.5 wt%Cu-2wt.%Mo-1.75 wt%Ni-0.75 wt%Fe-(0–1)wt.%CeO 2 alloy powders as raw materials, W–Cu–Mo–Ni–Fe–CeO 2 alloys with excellent performances were prepared by low temperature sintering . Two-step reduction method consisting of carbothermic pre-reduction and hydrogen deep deoxidation was used to produce ultrafine W–Cu–Mo–Ni–Fe–CeO 2 alloy powders with uniform distributed composition. All sintered blocks obtained relatively high densification degree (97.1 %∼99.2 %) to ensure the excellent comprehensive properties. Moreover, the existences of γ-(Cu, Ni, Fe) and W–Mo solid solutions ensured the alloy possessed a high mechanical strength . More importantly, the introduction of CeO 2 inhibited the growth of W–Mo grains. With increasing CeO 2 content from 0 wt% to 1 wt%, the W–Mo grain size decreased from 1.76 μm to 1.44 μm. Especially, alloy sample with the highest tensile and compressive strengths was obtained by adding 0.5 wt% CeO 2 , which were 602 MPa and 3187 MPa, respectively. Furthermore, owing to finer W–Mo grain size, this sample also possessed the maximum micro-hardness and bending strength of 482 H V and 1685 MPa, respectively. Nevertheless, the existences of Ni, Fe and CeO 2 also destroyed the electrical conductivities of the samples to some extent. Specifically, with increasing CeO 2 content from 0 wt% to 1 wt%, the electrical conductivity of the sample decreases from 32.56 %IACS to 30.16 %IACS.
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ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Kaibo Xu,Liqin Cao,Zhouyu Wang,Liu-ping Chen
Hemoperfusion (HP) is one of the most prominent therapies for treating uremia, hyperbilirubinemia, and acute drug toxicity. The comprehensive performance of currently used porous HP adsorbents needs to be improved due to the impediment to their synthesis strategy. Herein, green carbon dioxide-in-water high internal phase emulsions (C/W HIPEs) were utilized and emulsified with poly(vinyl alcohol) (PVA) for the formation of a heparin-mimetic chitosan oligosaccharides/poly(acrylamide-co-sodium 4-styrenesulfonate) [COS/P(AM-co-SSS)] monolith, which exhibited good mechanical properties, stable swelling performance, hydrophilic properties, anticoagulant effect, and low hemolysis. It showed a strong toxin adsorption capacity (415.2 mg/g for creatinine, 199.3 mg/g for urea, 279.5 mg/g for bilirubin, and 160 mg/g for tetracycline). The adsorption process of porous COS/P(AM-co-SSS) followed the pseudo-second-order kinetic and Langmuir isotherm models. Moreover, the porous materials had a strong electrostatic force on creatinine. The removal of creatinine by simulated in vitro blood perfusion was 80.2% within 30 min. This work provides a green preparation strategy for developing novel HP materials, highlighting their potential application value in blood and environmental purification.
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PubMed
高影响因子
Foods
·
2023
·Vol. 12
·期 5
·1068
·
IF 5.2
Meixiang Yao,Xin Qi,Jiahui Zhang,Chengyuan Wang,Jianhua Xie
Mesona chinensispolysaccharide (MCP), a common thickener, stabilizer and gelling agent in food and pharmaceuticals, also has antioxidant, immunomodulatory and hypoglycemic properties. Whey protein isolate (WPI)-MCP conjugate was prepared and used as a stabilizer for O/W emulsion in this study. FT-IR and surface hydrophobicity results showed there could exist interactions between -COO- in MCP and -NH3+in WPI, and hydrogen bonding may be involved in the covalent binding process. The red-shifted peaks in the FT-IR spectra suggested the formation of WPI-MCP conjugate, and MCP may be bound to the hydrophobic area of WPI with decreasing surface hydrophobicity. According to chemical bond measurement, hydrophobic interaction, hydrogen bond and disulfide bond played the main role in the formation process of WPI-MCP conjugate. According to morphological analysis, the O/W emulsion formed by WPI-MCP had a larger size than the emulsion formed by WPI. The conjugation of MCP with WPI improved the apparent viscosity and gel structure of emulsions, which was concentration-dependent. The oxidative stability of the WPI-MCP emulsion was higher than that of the WPI emulsion. However, the protection effect of WPI-MCP emulsion on β-carotene still needs to be further improved.Keywords:Mesona chinensispolysaccharide;whey protein isolate;conjugate;emulsion
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Qin Geng,David Julian McClements,Zhihua Wu,Ti Li,Xuemei He,Xixiang Shuai,Chengmei Liu,Taotao Dai
Procyanidins are bioactive polyphenols that have a strong affinity to proteins. Beta-lactoglobulin (BLG) is widely used as an emulsifier in the food and other industries. This study evaluated the interaction between BLG and A-type procyanidin dimer (PA2) using the spectroscopic, thermodynamic, and molecular simulation. PA2 decreased the transmissivity and quenched the intrinsic fluorescence of BLG, suggesting that the two molecules formed a complex. The binding of PA2 reduced the surface hydrophobicity and altered the conformation of BLG with increasing the random coil regions. Thermodynamic and isothermal titration calorimetry analyses suggested that the main driving force of PA2-BLG interaction was hydrophobic attraction. Molecular docking simulations were used to identify the main interaction sites and forces in the BLG-PA2 complexes, which again indicated that hydrophobic interactions dominated. In addition, the influence of PA2 on the ability of BLG to form and stabilize O/W emulsions was analyzed. Emulsions formulated using BLG-PA2 complexes contained relatively small droplets (D 4,3 ≈ 0.7 μm) and high surface potentials (absolute value >50 mV). Compared to BLG alone, BLG-PA2 complexes improved the storage stability of the emulsions. This study provides valuable new insights into the formation, properties, and application of protein-polyphenol complexes as functional ingredients in foods.
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PubMed
高影响因子
Metals
·
2023
·Vol. 13
·期 5
·937
·
IF 2.9
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Ronghan Wei,Guoqiang Luo
W-Si-C composites with high relative densities and good mechanical and wear properties were successfully prepared by spark plasma sintering. The influence of SiC content on the relative density, microstructure, mechanical properties and wear characteristics was investigated. The results indicated that the reaction between SiC and W at their interface produced W2C and W5Si3. SiC also reacted with oxygen impurities at the W grain boundary to form SiO2. The purification of the grain boundaries of W was carried out by SiO2synthesis. Reactive sintering reduces the free energy of the system and facilitates the densification process of W-Si-C composites. This results in a significant increase in the relative density of W-Si-C composites, which reaches a maximum of 98.12%, higher than the 94.32% of pure tungsten. The hardness significantly increases from 4.33 GPa to 8.40 GPa when the SiC content is 2 wt% compared to pure tungsten due to the generation of the hard ceramic phase and the increase in relative density. The wear resistance of the W-Si-C composites was significantly improved with little SiC addition. The wear rate significantly decreased from 313.27 × 10−3mm3/N·m of pure tungsten to 5.71 × 10−3mm3/N·m of W-0.5 wt% SiC. SEM analyses revealed that the dominant wear mechanism of pure tungsten was attributed to fatigue wear, while that of W-Si-C composites was due to abrasive wear.Keywords:W-Si-C composites;spark plasma sintering;interface reaction;mechanical properties;wear characteristics
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 9
·1-10
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IF 2.8
Dong Shijun,Li Runqiu,Wu Junpeng,Zhong Wenxia,Zhao Ye,Ji Xinran,Zheng Hui,Zheng Peng,He Hong,Zheng Liang
With the development of 5G electronic products, solving electromagnetic pollution becomes an urgent issue for human health. In this work, the electromagnetic performance of W-type hexagonal barium ferrite (BaZn 2 Fe 16−x Ta x O 27 ) was improved by doping with high-valence Tantalum (Ta 5+ ) ions. The dependence of the concentrations of Ta 5+ ions on the microstructure, crystal structure and electromagnetic properties was studied in detail. Structural characterizations confirm that the doping Ta 5+ prefers the 4f2 site, increasing the lattice values and grain size, promoting more Fe 3+ translation into Fe 2+ , which effectively improves the electromagnetic properties including saturation magnetization, complex permittivity and permeability. However, some Ta 2 O 5 was also formed at the doping concentration of x = 0.2 which deteriorates the electromagnetic properties. The BaZn 2 Fe 16−x Ta x O 27 ferrite at x = 0.15 obtains the highest value of saturation magnetization of 92 emu/g, the highest intensity of complex permittivity and permeability, showing a potential application in absorbing material.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2023
·
IF 3.6
Xiao-Chun Deng,Xin Lan,Ya-Long Wang,Guo-Hua Zhang
Mo 2 C doped WC-10Co alloys were prepared via an in - situ synthesis method composed of steps of spray drying, roasting, carbothermal pre-reduction and carbonization-vacuum sintering. The effects of Mo 2 C content on the microstructure and mechanical properties of cemented carbides were studied in detail. The results showed that WC and Mo 2 C formed a complete solid solution by the current method. With the increase of Mo 2 C content from 0 wt% to 0.5 wt%, the effects of solution strengthening and fine grain strengthening were obvious, and the grain size was decreased from 0.72 ± 0.32 μm to 0.62 ± 0.27 μm, while the hardness was improved from 1316 ± 20 HV 30 to 1549 ± 14 HV 30 . However, the (W, Mo)C solid solution would deteriorate the fracture toughness of the alloys. With the further increase of Mo 2 C content to 9 wt%, the lattice distortion in the solid solution became more serious. Meanwhile, the dissolution of more Mo 2 C in the liquid Co further weakened the dissolution-precipitation process of the solid solution, thus inhibiting the growth of grains and increasing the hardness of the alloys. In addition, with the increase of Mo 2 C content, the dominant fracture mode of the alloy changed from transgranular fracture to intergranular fracture .
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 10
·e53590
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IF 3
Sisi Yuan,Yongjun Wang,Xiujun Wang,Donghua Liao,Ming Duan,Shenwen Fang
The block polyether demulsifier prepared by ring-opening polymerization of ethylene oxide and propylene oxide under high temperature and high pressure is the most widely used demulsifier for water in crude oil emulsion. It has the high synthesis risk and cost. Therefore, the development of non-block polyether demulsifier has attracted more and more attention. In this article, a new type of demulsifier was sythesized by radical polymerization of acrylate and cationic monomer. It was found that the copolymer PMA-co-PDBC of methyl acrylate (MA) and benzyldimethyl [2-[(1-oxoallyl)oxy] ethyl] ammonium chloride (DBC) synthesized in the mixed solvent of dipropylene glycol methyl ether and water had a good performance. When dosage of PMA-co-PDBC was 200 mg/L, the dehydration rate of water in crude oil emulsion with 50% water content can reach 80% at 80°C within 4 h. Structural and interface properties analysis presented that PMA-co-PDBC had a microblock structure similar with block polyether and it can effectively reduce the strength of W/O interfacial film to realize the demulsification. Although the demulsification performance of PMA-co-PDBC was not better than block polyether, its preparation safety and cost are much better. The results of this article can provide a new option for the development of crude oil demulsifier.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 10
·e53594
·
IF 3
Zejun Zhang,Fan Ye,Guosheng Ai,Huanyu Liu,Guanxin Zeng,Liwei Shen,Ying Yang,Huaikui Yuan,Xuening Feng,Yuanzhu Mi
A highly branched PNDC demulsifier with 2,6-naphthalenedicarboxylate as centronucleus was prepared by an efficient “one-pot” strategy. The product was characterized by FT-IR, 1 H-NMR, and TGA. The bottle test was performed to explore the effect of temperature, settling time, pH value, and concentration on the demulsification efficiency (DE). The DE reached an optimal value of 94.63% when the concentration of PNDC, settling time and operated temperature were 100 mg/L, 60 min and 70°C, respectively. Also, the DE could reach 91.58% when the concentration was only 20 mg/L at the same conditions. It showed that PNDC had an excellent performance in W/O emulsions with an extremely low concentration. Especially, PNDC could be used over a wide pH range (4–12) and high salinities, indicating that it had a good salt, acid and alkaline tolerance. In addition, the interfacial tension (IFT), surface tension (SFT), elastic modulus and micrograph analysis were carried out to investigate the possible mechanism. This work provides a highly branched demulsifier with high DE for the demulsification of stable W/O emulsions.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Xiangping Dai,Guoqiang Luo
Tungsten (W)-based composites with 1 wt% SiC were consolidated via field assisted sintering (FAST). FAST was conducted at temperatures ranging from 1000 °C to 1700 °C with holding times of 1–10 min under a pressure of 50 MPa. The densification and grain growth mechanisms were investigated using a creep deformation model and the grain growth power law. Various densification and grain growth mechanisms corresponded to different effective stress exponents ( n ) and grain growth exponents ( p ). n is the stress exponent associated with the densification mechanism, and p is the grain growth exponent related to the grain growth mechanism. The densification process mainly occurred at 1000 °C–1400 °C, whereas grain growth mainly occurred at 1500 °C–1700 °C. The W-Si-C composites were densified primarily through particle rearrangement (when n is ∼1), intergranular diffusion (when n is ∼2), and the dislocation-climb mechanism (when n is 3.62). The activation energies were estimated to be 153.80 and 541.17 kJ/mol at the effective stress exponents ( n ) of 1 and 2, respectively. Furthermore, intergranular diffusion is speculated to cause grain growth. The sintering temperature considerably affected the microstructure of W-Si-C composites. The silicide formed at sintering temperatures of <1100 °C was WSi 2 , and it transformed into W 5 Si 3 with increasing sintering temperature.
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FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Zhiming Gao,Chen Gao,Wenxin Jiang,Longquan Xu,Bing Hu,Xiaolin Yao,Yanlei Li,Yuehan Wu
It has been a great challenge of using natural polysaccharides to stabilize food emulsions , due to their poor amphiphilicity. In this study, a novel strategy of using polysaccharide to stabilize O/W emulsions was developed, through in situ crosslinking of sodium alginate on oil-water interface. During the emulsifying process, the acetic acid migrated across the interface, and induced the released of calcium ions , which immediately crosslinked the sodium alginate on interface. Results showed that the oil droplets were encapsulated in the integral polysaccharide shells. The droplet size of the emulsions located in the range from 20 to 200 μm. The concentration of sodium alginate and HAc, as well as the mixing rates were showed to be positively related with the thickness of the shell. However, excess calcium ions would disintegrate the shell structure. Additionally, the interfacial crosslinked sodium alginate stabilized emulsions exhibited excellent physical stability under centrifugating and freeze-thawing.
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高影响因子
危险品化学品经营许可证（带存储）