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- W1994667746 abstract "Water-dispersed silica nanoparticles (NPs) do not adsorb to the interface between immiscible bulks of water and hexane. Adding, however, a surfactant (cetyltrimethylammonium bromide, CTAB) to water induces the formation of a NP monolayer (ML) at this model liquid–liquid interface. We determined the ML's structure in situ at deeply buried planar water–hexane interfaces with sub-nanometer resolution by high energy X-ray reflectivity. Detailed modeling of the data yields the NPs' interfacial concentration and water immersion depth, allowing calculation of the NP average contact angle Θ. At a CTAB concentration ϕc = 0.75 mM, comparable to the critical micelle concentration, a dilute NP monolayer is found with Θ ∼ 128°. At lower surfactant concentration (ϕc = 0.05 mM) we find a dense ML of close-packed NPs with an unexpectedly high Θ ∼ 146°. The structure and adsorption scenarios of the NPs at the interface are discussed, highlighting the relevance of the present method for quantitative studies of a broad range of systems and applications." @default.
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- W1994667746 date "2012-01-01" @default.
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- W1994667746 title "Nanoscale structure of surfactant-induced nanoparticle monolayers at the oil–water interface" @default.
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- W1994667746 doi "https://doi.org/10.1039/c2sm26520f" @default.
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