Radially arrayed nanopillar formation on metallic stent wire surface via radio-frequency plasma

Acta Biomaterialia
Mariana C LoyaSungho Jin

Abstract

MP35N (Co-Ni-Cr-Mo alloy) is an important stent implant material for which many aspects, that include nanostructured surfaces, are yet to be understood. The present study provides the first creation of radially emanating metallic nanopillar structures on the surface of MP35N stent alloy wires; a novel textured surface structuring derived via controlled RF processing technique. The goal of this study was to characterize the newly found structures, identify evolution stages of nanopillar formations, as well as optimize RF process parameters for controlled surface texturing technique for stent wire materials. The exposure of a stent alloy wire, 250 microm diameter Co-Ni-Cr-Mo alloy (MP35N), to parameter-controlled RF environment resulted in dense surface nanostructures consisting of high-aspect-ratio dendritic nanopillars/nanowires. Extensive surface characterization and local compositional analyses by Transmission Electron Microscopy (TEM), Energy Dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS) show increased values of Mo contents on the outer edges of protruding nanopillars, indicating a possibility of the higher Mo content phase contributing to the differential plasma sputter etching on the MP35N surf...Continue Reading

Citations

Jun 25, 2014·Journal of Controlled Release : Official Journal of the Controlled Release Society·Ammar ArsiwalaVandana Patravale
Feb 5, 2013·Journal of Biotechnology·Aaron TanAlexander M Seifalian
Apr 5, 2011·Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology·Adam W Martinez, Elliot L Chaikof
Jan 5, 2014·Acta Biomaterialia·Calvin J GardnerSungho Jin
Jun 10, 2021·APL Bioengineering·Aleena Mary CherianDeepthy Menon

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