Coatings by plasmas of pyrrole on nitinol and stainless steel substrates

Authors

  • C. De Jesús Departamento de Física, Instituto Nacional de Investigaciones Nucleares. Instituto Tecnológico de Toluca
  • G. J. Cruz Departamento de Física, Instituto Nacional de Investigaciones Nucleares
  • L. M. Gómez Departamento de Física, Instituto Nacional de Investigaciones Nucleares. Posgrado en Ciencia de Materiales, Facultad de Química, Universidad Autónoma del Estado de México
  • O. G. López García Departamento de Física, Instituto Nacional de Investigaciones Nucleares
  • G. García Rosales Instituto Tecnológico de Toluca
  • A. Ramírez Santiago Departamento de Sistemas Biológicos, Universidad Autónoma Metropolitana Xochimilco
  • L. C. Ríos Departamento de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía

Keywords:

Stents, nitinol, polypyrrole, plasma

Abstract

Plasma polypyrrole was synthesized on stainless steel and Nitinol (Ni-Ti alloy) substrates in order to obtain polymer-metal compounds with high adhesion. The work has the objective to cover metal surfaces with polymers to reduce the contact of metallic surfaces with biological tissues in human body implants. The metal samples were subjected to RF glow discharges with water vapor and argon to clean, oxidize and erode before the polymer coatings. After that, the synthesis of polymers was carried out by glow discharges during 10 min at 13.56 MHz, 10-1 mbar and 20 W. The results showed that the coating is carried out in consecutive thin layers with the morphology of the metal at the interface. The coated samples were immersed in phosphate solutions (PBS) pH = 7.4 to simulate the conditions of salt concentration in human arteries and veins. The PPy coated metal substrates have rough morphology with resistance to PBS solutions. However, Nitinol samples needed Ar besides water discharges to clean, oxidize and erode.

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Published

2012-09-15

Issue

Vol. 25 No. 3 (2012)

Section

Research Papers

License

©2025 by the authors; licensee SMCTSM, Mexico. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/). 

How to Cite

Coatings by plasmas of pyrrole on nitinol and stainless steel substrates. (2012). Superficies Y Vacío, 25(3), 157-160. https://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/197