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Interfacial forces at layered surfaces: substrate electrical double-layer forces acting through ultrathin polymer coatings

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dc.contributor.authorWang, H.
dc.contributor.authorEvans, D.
dc.contributor.authorVoelcker, N.H.
dc.contributor.authorGriesser, H.J.
dc.contributor.authorMeagher, L.
dc.date.issued2019
dc.descriptionData source: Supporting information, https://doi.org/10.1021/acs.langmuir.9b02176
dc.description.abstractManipulating the surface properties of materials via the application of coatings is a widely used strategy to achieve desired interfacial interactions, implicitly assuming that the interfacial forces of coated samples are determined exclusively by the surface properties of the coatings. However, interfacial interactions between materials and their environments operate over finite length scales. Thus, the question addressed in this study is whether interactions associated with bulk substrate materials could act through thin coatings or, conversely, how thick a coating needs to be to completely screen subsurface forces contributed by underlying substrates. Plasma polymer layers were deposited on silicon wafer substrates from ethanol vapor, with identical chemical composition, ultrasmooth surfaces, and varying thicknesses. Using colloid-probe atomic force microscopy, electrical double-layer forces were determined in solutions of various ionic strengths and fitted using the Derjaguin-Landau-Verwey-Overbeek theory. For the thicker ethanol plasma polymers, the fitted surface potentials reflected the presence of surface carboxylate groups and were invariant with thickness. In contrast, for coatings <18 nm thick, the surface potentials increased steadily with decreasing film thickness; the measured electrical double-layer forces contained contributions from both the coating and the substrate. Theoretical calculations were in agreement with this model. Thus, our observations indicate that the higher surface potential of the underlying SiO2 surface can influence the interactions between a colloid particle and the multilayer structure if coatings are sufficiently thin. Such superposition needs to be factored into the design of coatings aimed at the control of material interactions via surface forces.
dc.identifier.citationLangmuir, 2019; 35(36):11679-11689
dc.identifier.doi10.1021/acs.langmuir.9b02176
dc.identifier.issn0743-7463
dc.identifier.issn1520-5827
dc.identifier.orcidEvans, D. [0000-0002-1525-2249]
dc.identifier.urihttps://hdl.handle.net/11541.2/140069
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.fundingARC DP160105001
dc.relation.fundingARC FT160100300
dc.rightsCopyright 2019 American Chemical Society Access Condition Notes: Accepted manuscript available open access
dc.source.urihttps://doi.org/10.1021/acs.langmuir.9b02176
dc.subjectinterfacial forces
dc.subjectpolymer coatings
dc.subjectsubstrates
dc.titleInterfacial forces at layered surfaces: substrate electrical double-layer forces acting through ultrathin polymer coatings
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12249119540001831 13305618430001831 9916307811001831_
ror.mmsid9916307811001831

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