Adsorption of alcohols and fatty acids onto hydrogenated (a-C:H) DLC coatings

Simič, Rok (avtor), Kalin, Mitjan (avtor), Kovač, Janez (avtor), Jakša, Gregor (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: DLC coatings, adsorption, alcohols, fatty acids, ToF-SIMS, XPS, wetting
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2016
• Št. strani: Str. 466-476
• Številčenje: Vol. 363
• PID: 20.500.12556/RUL-106734
• UDK: 539.92(045)
• ISSN pri članku: 0169-4332
• DOI: 10.1016/j.apsusc.2015.12.066
• COBISS.SI-ID: 14399003
• Datum objave v RUL: 14.03.2019

Gradivo je del revije

• Naslov: Applied surface science
• Skrajšan naslov: Appl. surf. sci.
• Založnik: Elsevier
• ISSN: 0169-4332
• COBISS.SI-ID: 3283215

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: mazanje, alkohol, adsorpcija, DLC prevleke

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0231
• Naslov: Tribologija