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

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Abstract
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.

Language:English
Keywords:DLC coatings, adsorption, alcohols, fatty acids, ToF-SIMS, XPS, wetting
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2016
Number of pages:str. 466-476
Numbering:Vol. 363
UDC:539.92(045)
ISSN on article:0169-4332
DOI:10.1016/j.apsusc.2015.12.066 Link is opened in a new window
COBISS.SI-ID:14399003 Link is opened in a new window
Views:102
Downloads:53
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Record is a part of a journal

Title:Applied Surface Science
Shortened title:Appl. surf. sci.
Publisher:North-Holland
ISSN:0169-4332
COBISS.SI-ID:3283215 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0231
Name:Tribologija

Secondary language

Language:Slovenian
Keywords:mazanje, alkohol, adsorpcija, DLC prevleke

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