Journal article
Water nanodroplet on a hydrocarbon “Carpet”—The mechanism of water contact angle stabilization by airborne contaminations on Graphene, Au, and PTFE surfaces
Langmuir, Vol.35(2), pp.420-427
2019
Abstract
Wetting is very common phenomenon, and it is well documented that the wettability of a solid depends on the surface density of adsorbed airborne hydrocarbons. This “hydrocarbon hypothesis” has been experimentally confirmed for different surfaces, for example, graphene, TiO2, and SiO2; however, there are no scientific reports describing the influence of airborne contaminants on the water contact angle (WCA) value measured on the polytetrafluoroethylene (PTFE) surface. Using experimental data showing the influence of airborne hydrocarbons on the wettability of graphene, gold and PTFE by water, together with Molecular Dynamics simulation results we prove that the relation between the WCA and the surface concentration of hydrocarbons (n-decane, n-tridecane, and n-tetracosane) is more complex than has been assumed up until now. We show, in contrast to commonly approved opinion, that adsorbed hydrocarbons can increase (graphene, Au) or decrease (PTFE) the WCA of a nanodroplet sitting on a surface. Using classical thermodynamics, a simple theoretical approach is developed. It is based on two adsorbed hydrocarbon states, namely, “carpet” and “dimple”. In the “carpet” state a uniform layer of alkane molecules covers the entire substrate. In contrast, in the “dimple” state, the preadsorbed layer of alkane molecules covers only the open surface. Simple thermodynamic balance between the two states explains observed experimental and simulation results, forming a good starting point for future studies.
Details
- Title
- Water nanodroplet on a hydrocarbon “Carpet”—The mechanism of water contact angle stabilization by airborne contaminations on Graphene, Au, and PTFE surfaces
- Authors/Creators
- A.P. Terzyk (Author/Creator)P. Bryk (Author/Creator)E. Korczeniewski (Author/Creator)P. Kowalczyk (Author/Creator)A. Zawadzka (Author/Creator)P. Płóciennik (Author/Creator)M. Wiśniewski (Author/Creator)R.P. Wesołowski (Author/Creator)
- Publication Details
- Langmuir, Vol.35(2), pp.420-427
- Publisher
- American Chemical Society
- Identifiers
- 991005542558807891
- Copyright
- © 2018 American Chemical Society
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 2 Chemistry
- 2.160 Microfluidic Devices & Superhydrophobicity
- 2.160.365 Superhydrophobic
- Web Of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- ESI research areas
- Chemistry