Abstract: An article having an antibacterial surface having an antibacterial surface having the nano scale flakes or platelets arranged essentially aligned to each other and extending out from said surface with a length in the range of 0.5-30 microns. The antibacterial surface is produced by processing a mixture of a polymer matrix material and a filler material comprising the nanoscale flakes or platelets by pressing the mixture through a die while heated to a temperature above a melting temperature of the polymer matrix material. Hereby, the nano scale flakes or platelets become aligned, with their longitudinal directions being oriented in substantially the same direction. A surface of the processed mixture which is oriented essentially perpendicularly to the longitudinal directions of the nano scale flakes or platelets is then etched or ablated to partly expose the nano scale flakes or platelets, thereby making the surface antibacterial.