Adsorption of alcohols and fatty acids onto hydrogenated (a-C:H) DLC coatings
ID Simič, Rok (Author), ID Kalin, Mitjan (Author), ID Kovač, Janez (Author), ID Jakša, Gregor (Author)

.pdfPDF - Presentation file, Download (584,94 KB)
MD5: 4A618961CB9AABB3D141D7AA69FC717D
URLURL - Source URL, Visit https://www.sciencedirect.com/science/article/pii/S0169433215030718?via%3Dihub This link opens in a new window

Information about the interactions between lubricants and DLC coatings is scarce, despite there having been many studies over the years. In this investigation we used ToF-SIMS, XPS and contact-angle analyses to examine the adsorption ability and mechanisms with respect to two oiliness additives, i.e., hexadecanol and hexadecanoic acid, on an a-C:H coating. In addition, we analyzed the resistance of the adsorbed films to external influences like solvent cleaning. The results show that both molecules adsorb onto surface oxides and hydroxides present on the initial DLC surface and shield these structures with their hydrocarbon tails. This makes the surfaces less polar, which is manifested in a smaller polar component of the surface energy. We also showed that ultrasonic cleaning in heptane has no significant effect on the quantity of adsorbed molecules or on their chemical state. This not only shows the relatively strong adsorption of these molecules, but also provides useful information for future experimental work. Of the two examined molecules, the acid showed a greater adsorption ability than the alcohol, which explains some of the previously reported better tribological properties in the case of the acid with respect to the alcohol.

Keywords:DLC coatings, adsorption, alcohols, fatty acids, ToF-SIMS, XPS, wetting
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Author Accepted Manuscript
Number of pages:Str. 466-476
Numbering:Vol. 363
PID:20.500.12556/RUL-106734 This link opens in a new window
ISSN on article:0169-4332
DOI:10.1016/j.apsusc.2015.12.066 This link opens in a new window
COBISS.SI-ID:14399003 This link opens in a new window
Publication date in RUL:14.03.2019
Copy citation
Share:Bookmark and Share

Record is a part of a journal

Title:Applied surface science
Shortened title:Appl. surf. sci.
COBISS.SI-ID:3283215 This link opens in a new window

Secondary language

Keywords:mazanje, alkohol, adsorpcija, DLC prevleke


Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0231

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections: