Nanoscale condensation of water on self-assembled monolayers

Simple item page
dc.contributor.authorJames, Men_AU
dc.contributor.authorDarwish, TAen_AU
dc.contributor.authorCiampi, Sen_AU
dc.contributor.authorSylvester, SOen_AU
dc.contributor.authorZhang, Zen_AU
dc.contributor.authorNg, Aen_AU
dc.contributor.authorGooding, JJen_AU
dc.contributor.authorHanley, TLen_AU
dc.date.accessioned2011-09-15T00:47:51Zen_AU
dc.date.available2011-09-15T00:47:51Zen_AU
dc.date.issued2011-06-07en_AU
dc.date.statistics2011-09-15en_AU
dc.description.abstractWe demonstrate that water is almost universally present on apparently dry self-assembled monolayers, even on those considered almost hydrophobic by conventional methods such as water contact goniometry. The structure and kinetics of nanoscale water adsorption onto these surfaces were investigated using X-ray and neutron reflectometry, as well as atomic force microscopy. Condensation of water on hydrophilic surfaces under ambient conditions formed a dense sub-nanometre surface layer; the thickness of which increased with exponentially limiting kinetics. Tapping mode AFM measurements show the presence of nanosized droplets that covered a small percentage ([similar]2%) of the total surface area, and which became fewer in number and larger in size with time. While low vacuum pressures ([similar]10-8 bar) at room temperature did nothing to remove the adsorbed water from these monolayers, heating to temperatures above 65 [degree]C under atmospheric conditions did lead to evaporation from the surface. We demonstrate that water contact angle measurements are not necessarily sensitive to the presence of nanoscale adsorbed water and do not vary with time. For the most part they are a poor indicator of the kinetics and the amount of water condensation onto these surfaces at the molecular level. In summary, this study reveals the need to exclude air containing even trace amounts of water vapor from such surfaces when characterizing using techniques such as X-ray reflectometry.© 2011, Royal Society of Chemistryen_AU
dc.identifier.citationJames, M., Darwish, T.A., Ciampi, S., Sylvester, S.O., Zhang, Z.M., Ng, A., Gooding, J.J., & Hanley, T.L. (2011). Nanoscale condensation of water on self-assembled monolayers. Soft Matter, 7(11), 5309-5318. doi:10.1039/c1sm05096fen_AU
dc.identifier.govdoc3402en_AU
dc.identifier.issn1744-683Xen_AU
dc.identifier.issue11en_AU
dc.identifier.journaltitleSoft Matteren_AU
dc.identifier.pagination5309-5318en_AU
dc.identifier.urihttp://dx.doi.org/10.1039/c1sm05096fen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3736en_AU
dc.identifier.volume7en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectWateren_AU
dc.subjectVapor condensationen_AU
dc.subjectNeutron reflectorsen_AU
dc.subjectAtomic force microscopyen_AU
dc.subjectLayersen_AU
dc.subjectMolecular structureen_AU
dc.titleNanoscale condensation of water on self-assembled monolayersen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles