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The presented study highlights the efficiency of employing a KrF excimerlaser to create diverse types of periodic nanostructures (LIPSS - laser inducedperiodic surface structures) on polyether ether ketone (PEEK) and polyethylenenaphthalate (PEN) substrates. By exposing the polymer films below theirablation threshold to laser fluence ranging from 4 to 16 mJcm-2 at 6,000pulses, we studied both single-phase exposure at beam incidence angles of 0degand 45deg, and two-phase exposure. Atomic force microscopy analysis revealedthat the laser-treated samples contained distinctive periodic patterns such aswaves, globules, and pod-like structures each exhibiting unique surfaceroughness. Moreover, using analytical methods like EDS and XPS shed light onthe changes in the atomic composition, specifically focusing on the C and Oelements, as a result of laser exposure. Notably, in almost all cases, weobserved an increase in oxygen percentage on the sample surfaces. This increasenot only led to a decrease in the contact angle with water but also lowered thezeta potential value, thus showing that the modified samples have enhancedhydrophilicity of the surface and altered electrostatic properties. Last butnot least, the samples were assessed for biocompatibility; we studied theinteraction of the prepared replicates with mouse myoblasts (C2C12). The impactof globular/dot structures on the cell growth in comparison to pristine orlinear LIPSS-patterned surfaces was determined. The linear pattern (LIPSS)induced the myoblast cell alignment along the pattern direction, whiledot/globular pattern even enhanced the cytocompatibility compared to LIPSSsamples.

LIPSS pattern induced by polymer surface instability for myoblast cell guidance