Antibacterial Performance on Microscale Roughness Formed by Fine Particle Bombarding

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  • 微粒子投射によって形成された微細凹凸の抗菌性能
  • ビリュウシ トウシャ ニ ヨッテ ケイセイ サレタ ビサイ オウトツ ノ コウキン セイノウ

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Abstract

<p>Fine particle bombarding（FPB）is typically used to modify metal surfaces by bombardment with fine particles at high speed. After bombardment with particles ranging in diameter from several to tens of micrometers, fine microscale concavities and convexities are formed on a surface. We have reported that SUS304 stainless steel with such a microscale rough surface formed by FPB shows antibacterial activity. However, SUS304 includes some metal ions such as Co and Ni, which are known as antibacterial metals. To demonstrate that microscale roughness only expresses the antibacterial property, we coated diamond-like carbon（DLC）onto the FPB treated surface of SUS304 substrate, and used it for antibacterial property tests against Escherichia coli and Staphylococcus aureus. Consequently, we also confirmed that the DLC-coated FPB surface has antibacterial performance. This finding indicates that the antibacterial performance is not dependent on the material properties, but rather on the surface roughness.</p>

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