Laser polarization induced surface structuring of 316L stainless steel and influence on biocompatibility and antibacterial performance

Le résumé fourni par la source

The paper details the biocompatibility and antifouling investigations on polarization-dependent laser-induced periodic surface structures (LIPSS) generated on 316L stainless steel using circularly-polarized and linearly-polarized femtosecond (fs) laser pulses. Both LIPSS structures were self-sterilizing to control bacterial adhesion and colonization. LIPSS from the linearly-polarized fs laser had an antifouling rate of 92 ± 6% and 97 ± 3% against Staphylococcus aureus ( S. aureus), and Escherichia coli ( E. coli), respectively, compared to the polished stainless-steel sample kept as control. LIPSS from circularly-polarized fs laser had an antifouling rate of 41 ± 8% and 85 ± 6% against S. aureus and E. coli, respectively, compared to the polished stainless-steel sample kept as control. Further, the nanoripples generated using linearly-polarized fs-laser favored mammalian cell adhesion, proliferation, and alignment along the nanoripples. Based on the study, the LIPSS from circularly-polarized laser beam possesses antibacterial properties, while the LIPSS from linearly-polarized laser beam possesses both antibacterial and osseointegration properties.

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