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[IEEE 2018 7th Electronic System-Integration Technology Conference (ESTC) - Dresden, Germany (2018.9.18-2018.9.21)] 2018 7th Electronic System-Integration Technology Conference (ESTC) - Control for Au-Ag Nanoporous Structure by Electrodeposition and Dealloying
摘要： We investigated the composition, morphology, and dissolution behavior of an Au-Ag nanoporous structure formed by electrodeposition and dealloying. Formation of the films was carried out by changing the bath composition and the annealing temperature. The amount of Ag decreased from 70 wt. % to 45–50 wt. % after dealloying. As seen from analysis by a glow discharge optical emission spectrometer (GDOES), not only the amount of Ag, but also that of Au was decreased after dealloying, and a highly concentrated Ag layer was generated at the surface. When the Ag dissolves, an underpotential deposition (UPD) might be introduced, followed by the generation of a high concentration of Ag. From the anodic polarization measurement, the anodic current densities of the samples under 1.5 V were larger than those of the samples under 1.0 V, resulting in the generation of many nanopores. It was confirmed that dealloying involved three processes: whole film dissolution (includes Au dissolution), defects dissolution at the grain boundary, and Ag-selective dissolution.
关键词： dealloying,composition,morphology,electrodeposition,dissolution behavior,Au-Ag nanoporous structure
更新于2025-09-04 15:30:14
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Biomimetic Hierarchical TiO <sub/>2</sub> @CuO Nanowire Arrays-Coated Copper Meshes with Superwetting and Self-Cleaning Properties for Efficient Oil/Water Separation
摘要： Creating a practical and energy-efficient method with high efficiency to separate oil–water mixtures and emulsions is essential for sustainable aquatic ecosystem and waste oil recycling. Herein, we reported a completely inorganic hierarchical TiO2@CuO nanowire array-coated copper mesh membrane fabricated using chemical oxidation and hydrothermal recrystallization. The biomimetic hierarchical nano-/micro-structure can form a lotus-leaf-like interface with fine surface roughness and hydration ability, thus endows the membrane superhydrophilic and underwater superoleophobic nature. Thus, the as-synthesized TiO2@CuO nanowire array-coated copper mesh membrane demonstrated promising water flux of 87.6 kL·h-1·m-2 and ultrahigh separation efficiency with oil residue of only 12.4 mg·L-1 in the permeate. Moreover, the uniformly immobilized TiO2 nanoparticles exhibit UV-irradiated photocatalytic ability, which can be effectively regenerate the contaminated membrane after exposure to UV irradiations for 60 min. Therefore, this high efficiency, reusable, and easy-scalable membrane fabrication strategy may possess practical potential for next-generation oil/water separation application.
关键词： Biomimetic morphology,self-cleaning,nano-/micro- hierarchical structure,oil/water separation
更新于2025-09-04 15:30:14