Fundamental characteristics of biomimetic superhydrophobic surface of nitinol alloy fabricated via laser cauterization and FAS modification

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 688; p. 133690
• Main Authors: Weng, Lingtao, Zhang, He, Yang, Chengjuan, Wang, Meng, Hammad, Farid A., Lu, Zhilai, Yang, Zhen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05-05-2024
• Subjects: Biomimetic superhydrophobic surface; Chemical stability; Fluorosilane surface modification; Laser irradiation; Mechanical stability; Fluorosilane surface modification; Laser irradiation; Mechanical stability; Biomimetic superhydrophobic surface; Chemical stability
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2024.133690

Biomimetic superhydrophobic surfaces draw inspiration from the biological realm, seeking to replicate and refine their superhydrophobic properties. Fabricating super-hydrophobic surface on nitinol has significant application value in medicine, biomedical science, industry, and micro electric system due to the special performance of this material with super-hydrophobicity. In this study, we achieved a super-hydrophobic surface on a laser-processed rough nitinol surface through FAS modification, and its corrosion resistance in salt electrolytes was evaluated using potentiodyjnamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) measurements. The resulting indicated that the fabricated super-hydrophobic surface exhibited superior corrosion resistance performance. Besides, the mechanical properties of the material were also evaluated, revealing a reduction in contact angle by 2.04 and 2.82 times as well as enhanced wear its resistance. Furthermore, the promoting mechanism of chemical and abrasion stability were systematically elucidated based on scanning electron spectroscopy (SEM-EDS), 3D optical profiling, and X-ray photoelectron spectroscopy (XPS). These findings are anticipated to provide a deeper understanding of the fabrication of super-hydrophobic surfaces on nitinol alloys, thereby strengthening their potential for practical industrial and biomedical applications.
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•We elaborate on the formation mechanism of the superhydrophobic layer.•We detail the mechanisms of corrosion resistance.•We elucidate the formation mechanism of physical stability.