SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xuyang Li,Yingke Zhang,Shuyi Li,Xiaojing Xing,Xinfeng Cheng,Lin Wang,Xianchao Du,Shuai Li,Dongfang Qiu,Meng Guo
Mixed-matrix membranes (MMMs) show great potential for application in hydrogen separation study. However, the MMMs prepared by the traditional strategy have the imperfect compatibility of the matrix and fillers, and the non-ideal microstructure, undergoing a trade-off between permeability and selectivity. Herein, we report a new in-situ limited filling method to improve the H 2 /CH 4 separation performance of the maleic anhydride grafted polypropylene (MAPP) membranes medicated by a series of cyclodextrins (CDs). The introduction of CDs can better loosen the MAPP microstructure and ensure that the nanocomposite membranes have excellent H 2 permeabilities. The two-time limited filling can further compensate for the microvoids or defects in the membrane microstructure, thereby improving the H 2 /CH 4 separation stability of the nanocomposite membranes. The H 2 /CH 4 selectivities of the α-CD/MAPP, β-CD/MAPP, MEDβCD/MAPP, and γ-CD/MAPP are 7.1, 5.7, 6.3, and 5.1 times higher than that of pure MAPP membrane, respectively. This work provides a straightforward and effective strategy to fabricate homogeneous MMMs for gas separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 11
·6308-6318
·
IF 3.502
Aditya Jain,Yingang Wang,Hao Guo,Neng Wang
Novel lead-free diphasic (1- x )Ba 0.9 Sr 0.1 Ti 0.9 Hf 0.1 O 3 - x Na 0.5 Bi 0.5 TiO 3 (BSTH-NBT) ceramic nanocomposites were synthesized via an economically viable modified mechano-chemical activation technique. In the present investigation, we have developed an energy storage composite material by systematically optimizing the charge transport behavior and charge storage characteristics between the ferroelectric BSTH and piezoelectric NBT phase. The composite with x = 0.09 NBT concentration has shown the best energy storage properties with 1.61 J/cm 3 discharge energy density along with 80.1% energy efficiency. The BSTH and NBT had a synergetic effect on the ferroelectric properties of the composites. The improvement in ferroelectric and piezoelectric properties along with excellent aging characteristics in composite materials is mainly attributed to enhancement in microstructural density, grain boundary interface, and stress effects. The improved dispersibility and excellent compatibility between BSTH and NBT phase have resulted in approximately 20% enhancement in breakdown strength of composite compared to pure BSTH ceramic.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
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IF 2.3
Binbin Fan,Wei Sun,Zunlan Hu,Dengke Zhao,Bohan Wang,Shuo Zhao,Shijia Zhang,Fei Li,Zhipeng Xie,Kexin Chen,Guanghua Liu
Si 3 N 4 ceramics with enhanced thermal conductivity and mechanical properties were prepared by using nitride sintering additives of YN and MgSiN 2 . In addition to the conventional oxide sintering additives such as Y 2 O 3 and MgO, the use of nitride sintering additives offered more possibilities for the optimization of the microstructure and properties of Si 3 N 4 ceramics. The Si 3 N 4 sample with binary nitride additives of YN‒MgSiN 2 showed a coarse-grained microstructure and the maximum thermal conductivity of 112 W m −1 K −1 after heat treatment. However, the binary nitride additives were insufficient to supply sufficient liquid phase during the sintering of Si 3 N 4 ceramics, which caused porosity and impaired the mechanical properties. A good balance between thermal conductivity and mechanical properties was achieved by using nitride-oxide hybrid sintering additives of YN‒MgO, where the Si 3 N 4 sample showed both high thermal conductivity of 109 W m⁻ 1 K⁻ 1 and good mechanical properties with flexural strength of 707 ± 7 MPa, fracture toughness of 9.5 ± 0.2 MPa m 1/2 , and Vickers hardness of 14.9 ± 1 GPa.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Wei Zhao,Rui-feng Liu,Jie Yan,Xian Wang,Hong-wei Zhang,Wen-xian Wang
The microstructure evolution and mechanical properties of 5 wt% SiC/7075Al composites processed with a combination of three-step spark plasma sintering (SPS), hot rolling (HR), and high-frequency electric pulse assisted treatment (HEAT) processing were investigated herein. It was found that the HEAT tremendously promoted the recrystallization behavior after the hot rolling, leading to grain refinement and residual stress weakening. It can be attributed to the combination of the electrical (Electron wind) and thermal effects (Joule heat) of pulse current. Electron wind promotes the expansion of the movement of dislocations, providing the material basis for recrystallization. Joule heat and residual stress within the matrix provide the substance conditions. There was a remarkable improvement in strength and ductility, among which the increase in strength was mainly due to the combined effect of phase precipitation strengthening and grain refinement, while the increase in elongation was mainly attributed to grain refinement and residual stress weakening. Compared to those of the untreated samples, the average grain size decreased by 18.3%, residual stresses reduced by 70%, and tensile strength improved by 37.3%. High-frequency assisted treatment has a comprehensive improvement on the microstructure and mechanical properties of SiC/7075Al composites.
研究领域:
材料科学
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力学工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yuyu Liu,Wei Jiang,Zheng Chen,Quan Xu,Zhiliang Zhang,Jianying He
Due to the intrinsically ultrahigh cooling rate and thermal gradient during laser melting deposition (LMD), columnar-to-equiaxed transition (CET) of grains has been a significant challenge in titanium-based alloys. In this study, two strategies, including the optimization of processing parameters and the addition of ceramics particles, were utilized to promote the CET of Ti6Al4V. The optimal processing parameters of Ti6Al4V were confirmed by response surface methodology (RSM). The width of prior β grains effectively decreases under the minimum dilution of single track. Besides, different contents of TiB 2 and La 2 O 3 were added to Ti6Al4V powder and the in situ (TiB + La 2 O 3 )/Ti6Al4V composites were manufactured using the identified optimal processing parameters. In situ TiB whiskers segregating at the grain boundaries tailor the coarse columnar to equiaxed grains with La 2 O 3 particles dispersed in the composites. With increasing formation of the reinforcements, equiaxed grain size decreases from 23.3 to 11.9 μm. The ultimate tensile strength of the components was improved by 19.6% and 26.4% compared to that of Ti6Al4V. This work provides systematic solutions to suppress the coarse columnar grains and refine the microstructure for titanium-based alloys.
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
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2022
·
IF 12.781
Wei-Shi Sun,Ming-Jie Yin,Wen-Hai Zhang,Shuo Li,Naixin Wang,Quan-Fu An
Emerging excessive greenhouse gas emissions pose great threats to the ecosystem, which thus requires efficient CO 2 capture to mitigate the disastrous issue. In this report, large molecular size bisphenol A ethoxylate diacrylate (BPA) was employed to crosslink poly (ethylene glycol) methyl ether acrylate (PEGMEA) via the green and rapid UV polymerization strategy. The microstructure of such-prepared membrane could be conveniently tailored by tuning the ratio of the two prepolymers, aiming at obtaining the optimized microstructures with suitable mesh size and PEO sol content, which was approved by a novel low-field nuclear magnetic resonance technique. The optimum membrane overcomes the trade-off challenge: dense microstructures lower the gas permeability while loose microstructures lower high-pressure-resistance capacity, realizing a high CO 2 permeability of 1711 Barrer and 100-h long-term running stability under 15 atm. The proposed membrane fabrication approach, hence, opens a novel gate for developing high-performance robust membranes for CO 2 capture.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 4
·790-808
·
IF 6.707
Nie Guanglin,Li Yehua,Sheng Pengfei,Zuo Fei,Wu Haolin,Liu Leiren,Deng Xin,Bao Yiwang,Wu Shanghua
In this study, the chemical precipitation coating (CP) process was creatively integrated with DLP-stereolithography based 3D printing for refining and homogenizing the microstructure of 3D printed Al 2 O 3 ceramic. Based on this novel approach, Al 2 O 3 powder was coated with a homogeneous layer of amorphous Y 2 O 3 , with the coated Al 2 O 3 powder found to make the microstructure of 3D printed Al 2 O 3 ceramic more uniform and refined, as compared with the conventional mechanical mixing (MM) of Al 2 O 3 and Y 2 O 3 powders. The grain size of Al 2 O 3 in Sample CP is 64.44% and 51.43% lower than those in the monolithic Al 2 O 3 ceramic and Sample MM, respectively. Sample CP has the highest flexural strength of 455.37±32.17 MPa, which is 14.85% and 25.45% higher than those of Samples MM and AL, respectively; also Sample CP has the highest Weibull modulus of 16.88 among the three kinds of samples. Moreover, the fine grained Sample CP has a close thermal conductivity to the coarse grained Sample MM because of the changes in morphology of Y 3 Al 5 O 12 phase from semi-connected (Sample MM) to isolated (Sample CP). Finally, specially designed fin-type Al 2 O 3 ceramic heat sinks were successfully fabricated via the novel integrated process, which has been proven to be an effective method for fabricating complex-shaped Al 2 O 3 ceramic components with enhanced flexural strength and reliability.
研究领域:
材料科学
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陶瓷工程
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增材制造
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产品关联
DOI
高影响因子
Nanoscale
·
2025
·Vol. 17
·期 27
·16515-16522
·
IF 5.1
Zhengwei Li,Zixuan Fang,Jiajun Zhu,Wenxi Yang,Yubing Guo,Fan Wang,Jiyang Li,Mengqiang Wu
NCA (LiNixCoyAl1−x−yO2, x ≥ 0.8) cathode materials have become some of the leading candidates for lithium-ion batteries due to their superior specific discharge capacity and more cost-effective production. Yet, NCA materials are facing significant challenges such as surface reconstruction and micro-cracks, which adversely impact their electrochemical performance and practical application. Herein, a simple doping modification strategy using high-valence Mo6+ cations is proposed to address these issues. The experimental analysis results demonstrate the following: (1) the high-valence Mo6+ cations provide additional positive charge and reduce the migration barrier for Li+, thereby improving the Li+ transport kinetics of NCA; (2) Mo6+ doping not only refines the primary particle size, which compacts the stacking of particles, but also optimizes the microstructure of NCA, which prevents the development of micro-cracks and thus enhances the interfacial and bulk-phase stability of NCA; (3) acting as lattice pillars in the TM layers, the high-valence Mo6+ cations increase the thermodynamic barrier for Ni2+ migration from TM sites to lithium sites as well as strengthen the binding with oxygen atoms, thereby suppressing surface reconstruction and oxygen release. Based on the results of electrochemical testing, the prepared Li(Ni0.80Co0.15Al0.05)0.995Mo0.005O2 (NCAM-1) demonstrates a remarkable capacity retention rate of 89.3% after 100 cycles within the voltage range of 3.0–4.3 V and at a rate of 1C, which is significantly higher than the 79.1% retention observed for Li(Ni0.80Co0.15Al0.05)O2 (NCA). Additionally, NCAM-1 delivers a specific discharge capacity of 153.5 mA h g−1 at a high rate of 10C, which is substantially elevated compared to that of NCA (113.5 mA h g−1).
研究领域:
电化学
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材料科学
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能源存储
·
固态化学
·
电池技术
✓ 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）