The influence of KrF excimer laser irradiation on the surface of collagen and collagen-PVP filmsReport as inadecuate




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International Journal of Photoenergy - Volume 2006 2006, Article ID 35126, 7 pages



Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7, Toruń 87-100, Poland

Laboratoire de Physicochimie Moléculaire LPCM, UMR 5803 du CNRS, Université de Bordeaux 1, 351 Cours de la Libération, Talence 33405, France

Received 19 February 2006; Revised 16 June 2006; Accepted 18 June 2006

Copyright © 2006 M. Wisniewski et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The surface properties of collagen and collagen-polyvinyl pyrrolidone PVP films after KrF excimer laser irradiation λ=248nm were investigated by means of the technique of scanning electron microscopy SEM and optical microscopy OM. The laser irradiation of the used specimens caused an expansion of materials above their surface with pronounced sings of its melting. The height of the ablated volume in a case of collagen film at a fluence of 1.1J-cm

was approximately 5μm. A white damage appears on the treated surfaces at a threshold of 0.5J-cm

with a single pulse and becomes more visible for a higher fluence. It is also noteworthy that along with increasing fluences beginning from the fluence of 1.7J-cm

, the characteristic filaments at the spot edges are observed. The local heat and pressure generated by the laser radiation were able to induce bubble formation on the surface. Further bubble colliding and bursting produce a three-dimensional polymer “microfoam” structure with interconnected pores. These results can be of interest for some new applications.





Author: M. Wisniewski, A. Sionkowska, H. Kaczmarek, J. Skopinska, S. Lazare, and V. Tokarev

Source: https://www.hindawi.com/



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