Tribological tests had been performed employing a ball-on-disc T-11 tester. The balls ended up made from steel, whereas the discs were being crafted from steel, aluminium oxide, zirconium oxide, polyamide and poly(methyl methacrylate). The description on the machine along with the approaches is given within the literature (Szczerek and Tuszyński https://anionic-cationic06284.blogsvila.com/32141015/the-best-side-of-anionic-cationic