Münster 1997 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CP: Chemische Physik
CP 11: Poster zur Sitzung CP1
CP 11.23: Poster
Montag, 17. März 1997, 18:30–21:15, FBH
Scanning Force Microscopy of Laser-Irradiated Cartilage — •M. Mertig1, E. Sobol2, and W. Pompe1 — 1Max-Planck-Arbeitsgruppe, ”Mechanik heterogener Festk"orper” an der Technischen Universit"at Dresden, Hallwachsstr. 3, D-01069 Dresden — 2Research Center for Technological Lasers, Russian Academy of Sciences, Troitsk, 142092, Russia
Laser induced stress relaxation and shape forming of cartilages [1] will open new possibilities for the application of cartilage as transplantation material. At moderate laser treatment reshaping of cartilage without notable alterations of the cartilage structure has been demonstrated by light and scanning electron microscopy [2]. The goal of this work is to study laser-induced structural alterations in the cartilage matrix using scanning force microscopy. Samples of porcine nasal septum cartilage were irradiated with a CO2 laser with 50W/cm2, for 3s and 30s. Short time reshaping treatment modifies the cartilage matrix only little. In comparison with non-radiated cartilage, small holes of 100-300nm in size appear. In contrary, 30s laser treatment results in melting and denaturation of the cartilaginous matrix. Investigating section cuts of laser-treated samples, formation of small crystals up to 800nm in size has been observed at a depth close to the denaturation front.
[1] E. Helidonis, E. Sobol, Am. J. Otolaryngology 14, 410 (1993)
[2] E.N. Sobol, Phase Transformations and Ablation in Laser-Treated Solids, Wiley ans Sons, NewYork, (1995)