Nanostructured surfaces

Correlation between structure of self-assembled monolayers and their physicochemical properties on Ti incorporated carbon coatings
Zhylinski H.1, Prowizor M.1, Cichomski M.1
1 University of Lodz, Faculty of Chemistry, Department of Materials Technology and Chemistry, Pomorska 163, Lodz 90-236, Poland Transfer Technology 
E-mail: henadzi.zhylinski@chemia.uni.lodz.pl

The development of MEMS and NEMS production, modern biomedical applications and new techniques of biochemical analysis require materials with appropriate properties in micro- and nanoscale. An interest in modern materials that have enjoyed a growing interest in last years are titanium-incorporated diamond like carbon coatings (Ti-DLC) [1]. High friction coefficient and low wear resistance of Ti-DLC are limiting factors in the production of medical devices and implants.
One of the ways to improve physicochemical properties of surfaces in micro- and nanoscale is to create one- or two-component organosilane self-assembled monolayers by vapor phase deposition [2].
Surface morphology of two-component organosilane films was characterized using atomic force microscopy operating in air under ambient conditions. The hydrophobicity of modified substrates was determined by static and dynamic contact angle measurements. For more precise determination of hydrophobic properties, surface free energy (SFE) was calculated by van Oss-Good method. Tribological properties of obtained surfaces in the milinewton load range were characterized using ball-on-flat microtribometer T-23. The wear tracks after tribological tests were examined by a scanning electron microscope. 
In summary, the vapor phase deposition method was successfully used for modification Ti-DLC substrates. Modification by two organosilane compounds with methyl and trifluoromethyl terminal groups improved hydrophobic and tribological characteristics in comparison with of Ti-DLC substrates and one-component analogs.

1.	Cichomski M. et al. Tribological and corrosive investigations of perfluoro and alkylophosphonic self-assembled monolayers on Ti incorporated carbon coatings // Tribology International.-2019.-130.-P. 359-365.
2.	Kosla K., Grobelny J., Cichomski M., Preparation and frictional investigation of the two-component silanes deposited on alumina surface Applied Surface Science.-2014.-314.-P. 500-504.