ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yukun Zhang,Chong Chen,Zhengfei Chen,Tongtong Zhang,Yunlong Wang,Shuiyan Cao,Jun Ma
MXene-reinforced composite coatings have recently shown promise for metal anticorrosion due to their large aspect ratio and antipermeability; however, the challenges of the poor dispersion, oxidation, and sedimentation of MXene nanofillers in a resin matrix that are often encountered in the existing curing methods have greatly limited practical applications. Herein, we reported an efficient, ambient, and solvent-free electron beam (EB) curing technology to fabricate PDMS@MXene filled acrylate-polyurethane (APU) coatings for anticorrosion of 2024 Al alloy, a common aerospace structural material. We showed that the dispersion of MXene nanoflakes modified by PDMS-OH was dramatically improved in EB-cured resin and enhanced the water resistance through the additional water-repellent groups of PDMS-OH. Moreover, the controllable irradiation-induced polymerization enabled a unique high-density cross-linked network, presenting a large physical barrier against corrosive media. The newly developed APU-PDMS@MX1 coatings achieved excellent corrosion-resistance with the highest protection efficiency of 99.9957%. The coating filled with uniformly distributed PDMS@MXene promoted the corrosion potential, corrosion current density, and corrosion rate to be −0.14 V, 1.49 × 10–9 A/cm2, and 0.0004 mm/year, respectively, and the impedance modulus was increased by 1–2 orders of magnitude compared to that of APU-PDMS coating. This work combining 2D material with EB curing technology broadens the avenue for designing and fabricating composite coatings for metal corrosion protection.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guoying Liu,Junyue Shan,Lijun Cao,Hangqi Zhao,Ce Sun,Haiyan Tan,Yanhua Zhang
The low strength and high hygroscopicity of natural bamboo limit its use in structural building materials. Herein, lignin and hemicellulose were partially removed from natural bamboo in order to create bamboo frameworks featuring well-aligned bamboo fibers. Subsequently, these bamboo frameworks (BF) are infused with epoxy resin (EP) modified with PDMS and subjected to hot-pressing to fabricate bamboo-epoxy composites (PDMS-EP/BF). The incorporation of flexible PDMS chains facilitated intermolecular chain entanglement, which inhibited crack propagation and improved the bonding between bamboo and EP. The findings of the research indicated that the PDMS-EP/BF composites exhibited a significant enhancement in flexural strength by 98%, modulus of elasticity by 129%, toughness by 399%, and tensile strength by 177% when compared to natural bamboo. Additionally, the modification led to a decrease in the surface energy of the composites, resulting in increased hydrostatic contact angle and imparting water repellency to the material. Compared to natural bamboo, PDMS-EP/BF has 309% higher water contact angle and 143% lower surface energy. In addition, large composites have been prepared and their interface strength was tested. The findings of the study offer insights into the potential enhancement of bamboo composites to achieve increased flexural strength, modulus, and toughness. This could expand the utilization and significance of bamboo in the realm of construction materials.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Muhammad Rahim,Zhiqiang Zou,Zhuoyang Du,Lingmei Dai,Dehua Liu,Wei Du
Macroporous metal–organic frameworks (MOFs) exhibit immense promise as carriers for immobilizing macromolecules, notably lipases. Nevertheless, their minute particle dimensions pose challenges in the recycling process, thereby significantly constraining their widespread practical utilization. To address this limitation, this study explores the potential of incorporating magnetic substances during the carbonization process, especially focusing on the use of magnetically carbonized Macro-MIL-88A for lipase immobilization and biodiesel production. The effects of different carbonation temperatures on macroporous MIL-88A and microporous MIL-88A were investigated. Our findings revealed that the carbonization temperature influenced the preservation of the 3D structure and the generation of magnetite. Carbonized Macro-MIL-88A (Macro-Fe3O4-C) at 500 °C exhibited superior specific activity and enhanced activity recovery. Lipase immobilized on Macro-Fe3O4-C (Macro-Fe3O4-C-TLL) demonstrated higher methanol tolerance during the biodiesel production process compared to Micro-Fe3O4-C. The reduced reusability of Macro-Fe3O4-C-TLL was attributed to the adsorption of the by-product glycerol. We further investigated pre- and posthydrophobic modifications on Macro-Fe3O4-C and found that post-PDMS modification maintained both high enzyme loading and good reusability of the immobilized lipase during biodiesel production. This study presents a promising method to enhance the reusability of immobilized large molecules by incorporating magnetite via a straightforward carbonization process.
研究领域:
生物化学
·
材料科学
·
化学工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3535-3551
·
IF 2.1
Wei Liu,Baobao Zeng,Gao Yang
In this study, we adopted the novel strategies of the soot template method to construct SiO 2 ceramic micro-nano structure surface and polydimethylsiloxane (PDMS) modification to reduce the surface energy. We fabricated a superhydrophobic/superoleophilic NS-PDMS oil–water separation screen by depositing coarse nano-SiO 2 ceramic on the surface of 100-mesh stainless-steel screen used as a substrate under the soot template method, which reduced the surface energy with PDMS. The fabricated NS-PDMS screen exhibited excellent superhydrophobic and self-cleaning properties. In particular, the superhydrophobic properties were stably maintained under various harsh conditions. Overall, the screen manifested self-cleaning ability for various water-containing stains, for example, coffee, milk, beer, and soy sauce. The mechanically damaged screen surface still retained its high roughness, and re-modification with PDMS could recover the superhydrophobic surface and oil–water separation performance. This suggests the re-use potential of the damaged NS-PDMS screen, which is vital for cost reduction and resource recycling. We believe that our study makes a significant contribution to the literature, because the fabricated NS-PDMS screen is superhydrophobic, superoleophilic, resistant toward several water-based solutions, chemically and mechanically stable under certain conditions, and can be reused with modification and repair after damage. Therefore, this screen can be broadly used as an oil–water separator.
研究领域:
材料科学
·
化学工程
·
环境科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）