Journal of Coatings Technology and Research
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2024
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IF 2.3
Xu Feifei,Dong Xin,Jia Qian,Chen Ruoyu
Mechanical strength is an important factor that affects and limits the life of surface antireflective (ARC) coatings such as optical lenses, photovoltaic panels, and liquid crystal displays. In this work, a network-structured silica sol was prepared using tetraethyl orthosilicate (TEOS) and methyltriethoxysilane as silicon sources. Triethoxy(1H,1H,2H,2H-nonafluorohexyl)silane (C 4 FTES) was used to modify the acid-catalyzed silica sol. Finally, the mixed sol was plated on the surface of polymethyl methacrylate by impregnation-pulling method. The coating obtained after drying at 100°C showed a maximum transmittance of 97.98% in the visible wavelength range (400–800 nm). The coating still maintained good optical properties after undergoing various wear-resistant tests such as sandpaper abrasion and cotton ball friction. Moreover, the pencil hardness test of the coating improved from 5B to 3H after it was modified by short-chain perfluoroalkyl groups (C 4 FTES). This work required only low-temperature treatment without calcination to prepare a silicon-based ARC coating formed by copolymerization of C 4 FTES and TEOS, and the mechanical properties of the coating meet actual needs. This easy-to-operate preparation method greatly expands the application scope of silicon-based ARC coatings in the field of heat-sensitive materials. Graphical abstract The polymethyl methacrylate (PMMA) substrate is coated with a fluorine-containing coating with a network structure, which greatly improves the transmittance and surface hardness of the substrate.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hao Zhang,Yufei Tang,Xuan Zhou,Yani Sun,Qian Liang,Kang Zhao,Zixiang Wu
The primary component of natural bone minerals, hydroxyapatite (HA), has been the subject of research on materials for bone implants . Sintered HA scaffolds, on the other hand, degrade slowly after implantation and exhibit a high degree of crystallization at high temperatures, making it challenging to match the rate at which new bone grows. In this study, the benefit of self-curing calcium phosphate bone cement was employed to create porous apatite scaffolds without sintering. The lamellar pore structure was created by directional freeze-casting, and the enhanced specific surface area aided the in-situ hydration process . The crystallinity of sinterless porous apatite scaffolds diminishes when the TTCP and DCPD molar ratios drop. When the molar ratio is adjusted to 1:2.25, the crystallinity of the fabricated scaffold is reduced to 63.99 %, and 10.21 % can be degraded in 30 days. The degradation of porous scaffolds in simulated body fluids mainly depends on the rapid dissolution and transformation of solid phase powders in the early hydration reaction and the slow diffusion of the apatite in the later stage. The compressive strength of the porous scaffold is 5.3 MPa and its elastic modulus is 0.68 GPa. After 14 days of degradation, the compressive strength was 4.0 MPa and the elastic modulus was 0.64 GPa, which was still within the applicable range of cancellous bone repair. It has a promising application prospect as a substitute scaffold for absorbable cancellous bone.
研究领域:
生物材料学
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医学工程
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 6
·2768-2774
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IF 5.503
Qinghai Yang,Congquan Zhou,Jihong Ni,Xiaofei Guan
We present a liquid catalytic system comprising a liquid Ni–Bi alloy and a molten K2CO3 salt, which completely resolves the coking and sintering issues for dry reforming. The conversions of CH4 and CO2 reach 60% and 70%, respectively, in a 30 cm bubble column comprising 15 cm Ni0.27Bi0.73 and 15 cm K2CO3 at 1050 °C. The CO selectivity is near 100% throughout the temperature range of 950–1050 °C. A 120 hour stability test at 1000 °C shows no performance degradation, suggesting a stable and effective dry reforming process for syngas production. The catalytic performance and durability demonstrated highlight the potential of dry reforming for commercial applications.
研究领域:
化学工程
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催化
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能源转换
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DOI
高影响因子
Advanced Composites and Hybrid Materials
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2025
·Vol. 8
·期 3
·1-14
·
IF 21.8
Lu Jinyang,Ma Biao,Chen Gangsheng,Chen Yi,Gao Yakun,Chen Yanjie,Deng Haoran,Lu Bo,Liu Hong
Stretchable conductive composites show promising applications ranging from wearable electronics to soft robotics. Gallium-based liquid metals (LMs) characterized by both high metallic conductivity and fluidity are ideal deformable fillers for stretchable conductive composites. However, high loading of LM and post-sintering are required to create conductive pathways, leading to high metal consumption, high density of composites, and increased fabrication complexity. Herein, we report a phase transition and mechanochemistry-enabled lightweight three-dimensional LM skeleton with a low density of 0.2 g/cm 3 using a salt sacrificial template strategy. The initially conductive skeleton allows the capillary filling of various polymer precursors for sintering-free and on-demand formation of various functional composites. The resulting LM-Ecoflex composite exhibits low metal loading (3.7 vol%), high conductivity (1.3 × 10 3 S/m) and stretchability (774% strain), and good durability (Δ R = 1.2% over 10,000 cycles at 100% strain). Moreover, we show the monolithic fabrication of soft robotic actuators, which can be achieved by integrating the LM skeleton with thermally responsive polymers. We also demonstrate potential applications of LM-Ecoflex composites in enhanced electromagnetic shielding and heat transfer. This work provides a versatile way to on-demand create lightweight and multifunctional LM-based soft devices. Graphical A phase transition and mechanochemistry-enabled lightweight three-dimensional liquid metal (LM) skeleton is created using a salt sacrificial template strategy. The initially conductive skeleton allows the capillary filling of various polymer precursors for the sintering-free and on-demand formation of various functional composites. Such lightweight and conductive LM composites have advantages in robotic actuators, electromagnetic shielding, and thermal management.
研究领域:
材料科学
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纳米技术
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软体机器人
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导电复合材料
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柔性电子器件
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热管理
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电磁干扰屏蔽
✓ 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）