Surface Nano-texturing of Stainless Steel for Biocompatibility Enhancement of Implantable Medical Devices
Stainless steel (SUS) has been used in many industrial fields such as bio and medical parts. Especially, implanted medical device (IMD) has been widely researched for enhancing a human life from biological treatment using those devices. These medical devices require some essential requirements, such as biocompatible, non-toxic and human safety. For these reason, many researchers have been suggest a method of surface treatment to decrease a biological damages due to implanted in vivo. However, these proposed methods were had some disadvantages such as semi-permanent and require additional processes. To overcome these disadvantages, our research proposes a surface texturing method that is anodic oxidation based on electro-chemical reaction. Firstly, 1μm aluminum thin layer was deposited on the 4inch SUS-316L wafer. At this point, for the comparison of SUS-316L wafer with different surface roughness conditions, we have prepared polished and unpolished surface wafer. Using suggested method, porous aluminum oxide layer was formed and then we have removed oxide layer using alumina chemical etchant. Finally, we have fabricated various shapes of irregular nano/micro dimple structures with 100nm to 50μm according to surface roughness conditions.
KeywordsStainless steel-316L Surface texturing Micro/nano dimple structure Biocompatibility aluminum anodic oxidation Dielectric breakdown
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