JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Aolin Xie,Bei Zhang,Yicheng Ge,Ke Peng,Ping Xu,Xiaodong Wang,Zhirong Feng,Maozhong Yi,Zhe Zhou
To maintain the thermal stability of SiC nanowires during SiC coating fabrication process, carbon and SiC double protective layers were covered on the surface of nanowires. And SiC nanowires with double protective layers toughened SiC coating were prepared by pack cementation. The results showed that after introducing the SiC nanowires with double protective layers, the fracture toughness of the SiC coating was increased by 88.4 %. The coating protected C/C for 175 h with a mass loss of 3.67 %, and after 51 thermal shock cycles, the mass losses of the oxidized coating were 3.96 %. The double protective layers are beneficial to improve the thermal stability of nanowires, leading to good fracture toughness and thermal shock resistance of SiC coating. SiC nanowires consume the energy of crack propagation by fracture, pullout and bridging, leading to an increase in fracture toughness.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yang Lei,Yongjing Liu,Qiang Liu,Zhengbin Xu,Bo You,Xiaoliang Mo,Limin Wu,Heng Man,Wenxia Ma,Haitao Wang
The service life of metal and other infrastructure requires extending through eco-friendly, low-carbon technology. Here, a nacre-mimetic γ-Fe2O3/reduced graphene oxide (FrGO)/zinc-containing epoxy coating (FrGO/Zn/epoxy coating) was fabricated by spraying a mixture of waterborne epoxy resin, zinc flakes, and magnetic conductive FrGO under a magnetic field. The FrGO, which was synthesized by in situ redox and precipitation, was aligned in the zinc-containing coatings (ZCC), and it oriented the zinc flakes in the direction of the magnetic field to mimic the lamellar structure of nacre. The obtained anti-corrosion coating showed enhanced barrier protection and cathodic protection, which was confirmed by the electrochemical tests and salt spray test results. The waterborne coatings less than 50 μm thick with parallelly aligned FrGO and 30 wt % zinc flakes exhibited a long cathodic period lasting more than 99 days and excellent barrier performance with a high initial coating resistance of 5.31 × 109 Ω·cm2, which was superior to that of the conventional zinc-rich coating containing 80 wt % zinc (80 days, 3.74 × 103 Ω·cm2). The dual anti-corrosion mechanism of the waterborne FrGO/Zn/epoxy coating was investigated. The integrity and long-term cathodic protection of the coatings were derived from the compactness achieved by the nacre-mimetic structure and the interface chemical and hydrogen bonding crosslinking interactions and the high, uniform zinc utilization achieved by the aligned FrGO-Zn charge transmission network. This work provides a feasible nacre-inspired strategy to fabricate a lightweight anti-corrosion waterborne ZCC that is resource-efficient and promising in creating compact materials with other functional properties, such as electromagnetic shielding and conductive networks.
研究领域:
材料科学
·
腐蚀与防护
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 11
·2324-2334
·
IF 1.353
Xu Qingbo,Duan Panpan,Zhang Yanyan,Fu Feiya,Liu Xiangdong
In this work, we developed a new method that can achieve immobilization and protection of the Cu NPs coating on the cotton fabrics by a simple two-step impregnation method. Firstly, L-cysteine (Cys) was grafted onto cotton fabric via esterification with the hydroxyl groups of cellulose, then Cu NPs were introduced on the fabric surface in the presence of a protective reagent, citric acid. Due to the doubled stabilization acts of Cys and citric acid, the Cu NPs immobilized on the fabric surface showed an excellent antibacterial effect and outstanding laundering durability. As a result, the mean size of the Cu NPs coating on the cotton fabric is about 62.4 nm, and the modified cotton fabrics showed satisfactory antibacterial ability against both S. aureus and E. coli , which the bacterial reduction rates are all higher than 98 % even withstand 50 washing cycles. Therefore, this method to prepare antibacterial cotton fabrics showed great potential applications in socks, cosmetic, and medical textiles.
研究领域:
材料科学
·
纺织化学
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纳米医学
·
表面功能化
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抗菌材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yiting Bu,Jiaxi Liu,Dan Cai,Pengru Huang,Sheng Wei,Xiaoshuang Luo,Zhaoyu Liu,Fen Xu,Lixian Sun,Xueying Wei
NaBH 4 (10.8 wt% theoretical hydrogen storage capacity) is an ideal hydrogen carrier, but its hydrolysis reaction at room temperature requires high-efficiency catalysts for activation and acceleration. Structured catalysts can effectively inhibit metal particle agglomeration . However, metal particles fall off the surface of the support during testing. Therefore, we report a magnetic recyclable hollow shell material H-Co/N/C-Ru@C-T. The dual protection of carbonized ZIF-67 as a framework and surface-coated carbon film makes it show good catalytic activity and durability in NaBH 4 hydrolysis reaction. The hydrogen generation rate (HGR) is as high as 9815.82 mL H2 min −1 g −1 , and the activation energy ( E a ) is reduced to 26.9 kJ mol −1 . Moreover, it retains 81.3% of its initial catalytic activity even after 25 hydrolysis cycles. Through a series of characterization, such as electron scanning spectroscopy and inductively coupled plasma atomic emission, the improvement effect of using hollow Co/N/C as framework and coating carbon film on surface on the catalytic activity and durability of H-Co/N/C-Ru@C-650 is systematically revealed. We believe this work is of unusual significance on exploring novel hydrogen storage material catalysts, especially providing opportunities for the improvement of catalytic activity and durability of catalysts.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 49
·2412605
·
IF 27.4
Ze-Yu Wang,Zhao-Chen Li,Bo Li,An-Feng Shi,Long Zhang,Yin-Bo Zhu,Fang Ye,Shu-Hong Yu
Electromagnetic (EM) wave pollution and thermal damage pose serious hazards to delicate instruments. Functional aerogels offer a promising solution by mitigating EM interference and isolating heat. However, most of these materials struggle to balance thermal protection with microwave absorption (MA) efficiency due to a previously unidentified conflict between the optimizing strategies of the two properties. Herein, this study reports a solution involving the design of a carbon-based aerogel called functional carbon spring (FCS). Its unique long-range lamellar multi-arch microstructure enables tunable MA performance and excellent thermal insulation capability. Adjusting compression strain from 0% to 50%, the adjustable effective absorption bandwidth ( EAB ) spans up to 13.4 GHz, covering 84% of the measured frequency spectrum. Notably, at 75% strain, the EAB drops to 0 GHz, demonstrating a novel “on-off” switchability for MA performance. Its ultralow vertical thermal conductivity (12.7 mW m −1 K −1 ) and unique anisotropic heat transfer mechanism endow FCS with superior thermal protection effectiveness. Numerical simulations demonstrate that FCS outperforms common honeycomb structures and isotropic porous aerogels in thermal management. Furthermore, an “electromagnetic-thermal” dual-protection material database is established, which intuitively demonstrates the superiority of the solution. This work contributes to the advancement of multifunctional MA materials with significant potential for practical applications.
研究领域:
材料科学
·
电磁学
·
热工学
·
纳米技术
·
微波技术
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）