Development of newly antibacterial material with LIPSS

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05107
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26030:Composite materials and interfaces-related
• Research Institution: Fukui National College of Technology
• Principal Investigator: Sentoku Eisuke 福井工業高等専門学校, 機械工学科, 准教授 (10436834)
• Co-Investigator(Kenkyū-buntansha): 安丸 尚樹 福井工業高等専門学校, 機械工学科, 嘱託教授 (90158006)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: フェムト秒レーザー / 抗菌 / DLC / LIPSS

Outline of Final Research Achievements

In this study, our aim was to develop newly antibacterial materials with Laser Induced Periodic Surface Structure (LIPSS). The antibacterial effect of the nanostructured surfaces was evaluated by an antibacterial test using Escherichia coli. As a result, it was confirmed that the nanostructures add antibacterial properties on DLC (diamond-like carbon) films surface. The same effect was also obtained with SUS304 and titanium. The antibacterial effect appeared at a spacing of 100 to 200 nm between the nanostructures, and the effect was found to be dependent on the shape of the nanostructures. In addition, ball-on-disk tests between DLC and joint prosthesis materials with antibacterial nanostructures showed low friction with a coefficient of friction of less than 0.1.

Free Research Field

レーザ加工

Academic Significance and Societal Importance of the Research Achievements

フェムト秒レーザ照射によって形成したナノ構造によって高硬度な先端材料であるDLCに抗菌性を付与できることを明らかにした．また，その抗菌効果はナノ構造の形状に依存することを示した．これらの成果から，本手法は，様々な材料に対応し，クリーンかつ環境負荷が小さな新しい抗菌性付与加工として広範な分野に適応できる．