KrF laser ablation of a polyethersulfone film: Effect of pulse duration on structure formation

Laser surface modification of polyethersulfone films: effect of laser wavelength on biocompatibility

“…PES films were prepared as described elsewhere [16][17][18][19][20][21]. They were cut into pieces of 80 100 m in thickness and 30mm 10mm in dimension and were washed with ethanol before irradiation.…”

“…The number of adhered platelets was determined by LDH (lactate dehydrogenase) method [16,17]; and cell culture studies were done using L929 mouse cells for investigation of the surface toxicity [16,19]. …”

“…In the case of KrF micro ripples at low ( below the ablation threshold) and micro cones and columns appear on the surface at moderate and high fluences respectively.The number of cones increases withthe number of pulses and their height with the irradiation fluence;until well-defined columns are formed on the surface at a fluence of 200 mJ/cm 2 [17].…”

“…At the same fluence, the cone morphology and the roughness degree attained are more pronounced in the fs as compared to the ps case. Experiments performed at a different number of pulses for each pulseduration and fluence [17] indicate that the most probable mechanism behind microcones formation is the laser beam shielding by local inhomogeneities or surface instabilities induced by the laser irradiation process.…”

“…In our last papers [16][17][18][19][20][21] we investigated the effect of KrF, XeCl and ArF laser irradiation on the surface chemical,morphological and wettability of the polyethersulfone surface, individually. In this paper a brief comparison review between different wavelengths is done.…”