Thermoplastic Forming of a Hydrophilic Surface with a Nanostructure Array on Zr-Cu-Ni-Al-Y Bulk Metallic Glass

Abstract

The poor thermoplastic formability of reactive Zr-based bulk metallic glass becomes the main limiting factor for replacing the noble-metal-based and Be-rich bulk metallic glasses in nanostructure fabrication. In our work, a (Zr50.7Cu28Ni9Al12.3)98.5Y1.5 bulk metallic glass with good thermoplastic formability has been developed by alloying, where Y addition enlarges the processing window and decreases the viscous resistance of supercooled liquid caused by the high free volume density. The prepared Zr-Cu-Ni-Al-Y bulk metallic glass nanostructure retains the amorphous characteristic and generates the complex oxidization products in the surface layer. The enhanced hydrophilicity of the as-embossed surface follows a Wenzel-impregnating wetting regime, and it can be attributed to the large roughness coefficient induced by the capillary effect. This study provides a low-cost and environmentally friendly bulk metallic glass system to manufacture the nanostructure with a broad prospect in the field of electrocatalysis.

Controllable Fabrication of Hydrophilic Surface Micro/Nanostructures of CFRP by Femtosecond Laser

“…In addition, the wettability of CFRP controlled by femtosecond laser processing can not only achieve hydrophilicity but also achieve hydrophobicity. − This may be attributed to the different laser processing parameters, as well as the different resin composition, resin-fiber composition ratio, carbon fiber arrangement structure, fiber layer spacing, etc., which will affect the results of femtosecond laser processing. The excellent hydrophilicity of the laser-processed CFRP can be speculatively attributed to the intrinsic hydrophilicity of exposed carbon fibers, , the transformation of sp 2 orbitals to sp 3 orbitals of carbons, which can lead to more elevated free energy, , and the carbon fiber-epoxy resin fused micro/nanostructures, which may be beneficial to the capillary effect of water droplets. − The excellent hydrophilicity of laser-processed CFRP should be conducive to enhancing the bonding strength of CFRP used in combination with other materials or reducing the friction resistance of CFRP in close contact with human tissue, hence better meeting the usage requirements of CFRP.…”

“…The excellent hydrophilicity of the laser-processed CFRP can be speculatively attributed to the intrinsic hydrophilicity of exposed carbon fibers, 73 , 74 the transformation of sp 2 orbitals to sp 3 orbitals of carbons, which can lead to more elevated free energy, 75 , 76 and the carbon fiber-epoxy resin fused micro/nanostructures, which may be beneficial to the capillary effect of water droplets. 77 − 79 The excellent hydrophilicity of laser-processed CFRP should be conducive to enhancing the bonding strength of CFRP used in combination with other materials or reducing the friction resistance of CFRP in close contact with human tissue, hence better meeting the usage requirements of CFRP.…”

Influence of Oxidation on Structure, Performance, and Application of Metallic Glasses

“…[ 36 ] Because elements such as Y, Be, Al, and Si can preferentially form dense and uniform surface oxide scales, further O anion inward diffusion is suppressed, and oxidation resistance can be improved. [ 37 ] Decreasing the Cu content in Cu–Zr binary metallic glass similarly hinders O anion inward diffusion. [ 38 ] Meanwhile, adding other elements such as P, Hf, and Ti accelerates oxidation, thus reducing oxidation resistance.…”