Ziyu Chen,Yixin Xiao,Yuancheng Li,Haizhong Zheng,Guifa Li,Yongxiang Geng,Peifeng Zhou,Xin Wang
Hydrophobic surfaces are pivotal for self-cleaning, anti-icing, and corrosion resistance. Developing hydrophobic LaYbZrCeO 7 thermal barrier coating (TBC) offers an effective strategy to mitigate adhesion and corrosion induced by molten CMAS. In this paper, a periodic tip array with an average diameter of 100 μm and height of 45 μm was fabricated on LaYbZrCeO 7 TBC using femtosecond laser processing. Compared to the original coating, the periodic tip array increased non-polar C C bonds by 14.35 % and decreased polar C-O-C, O-C=O, and -OH bonds by 7.26 %, 7.09 %, and 19.66 %, respectively, thereby reducing the surface polarity. Additionally, droplets form a “solid-gas-liquid” three-phase contact with the periodic tip array, reducing solid-liquid interaction and enhancing hydrophobicity. The average contact angles on the LaYbZrCeO 7 tip array and original coating were 145.2° and 58.4°, respectively, demonstrating the array's hydrophobicity. In addition, the contact angle between the periodic tip array and molten CMAS is 59.6°, which is significantly higher than the original coating's 19.6°.These results offer novel insights into enhancing the resistance of LaYbZrCeO 7 TBC against adhesion and corrosion from molten CMAS.
Black coatings benefit from low reflectance or high light absorption are utilized in multifarious optical applications. Due to their unique three-dimensional nanostructure and π-band optical transitions, vertical graphene (VG) has drawn great attention to the field of black coatings. However, how the morphology of VGs affects reflectance has not been comprehensively disclosed yet. In addition, the morphology of the substrate for VG growth also affects the absorption properties. Here, we report a nano-and micro-engineered VG/Ni structure based on VG and laser-modified nickel foil, which possesses omnidirectional low reflectance of ∼0.25% over the visible range. A larger spacing of graphene nanowalls is more conducive to the formation of light traps and improves the absorption property. Besides, the surface of nickel substrate by laser irradiation presents a “cauliflower-like” microstructure, which further enhances light-trapping ability.
Bone tissue defects caused by trauma, aging, or tumors necessitate advanced regenerative strategies. This study investigates silica-doped hydroxyapatite (HAp) scaffolds with Gyroid triply periodic minimal surface (TPMS) structures fabricated via digital light processing (DLP), combined with femtosecond laser (FS) surface modification to enhance mechanical, bioactive, and antibacterial properties. Finite element analysis (FEA) and computational fluid dynamics (CFD) revealed that the Gyroid structure exhibited superior mechanical isotropy (Zener ratio ≈ 1) and permeability (34.52×10 -9 m 2 ) compared to Schwarz and Fluorite lattices, facilitating efficient nutrient transport and cell migration. FS ablation induced hierarchical micro/nanostructures on silica-doped HAp (FSH), increasing surface area (121 ± 1.03 μm 2 ) and hydrophilicity (contact angle: 27.7°), which enhanced protein adsorption (88.0 ± 20.3 μg/mL) and osteoblast adhesion/proliferation. In vitro tests demonstrated FSH’s antibacterial efficacy against E. coli (82.83% inhibition) and robust bioactivity via hydroxyapatite layer formation in simulated body fluid. These findings highlight the potential of DLP-printed Gyroid scaffolds with FS-modified surfaces as a promising platform for bone tissue engineering, offering tailored mechanical properties, enhanced mass transfer, and multifunctional biological responses.
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