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    Influence of Perfluorohexane-Enriched Atmosphere on Viscoelasticity and Structural Order of Self-Assembled Semifluorinated Alkanes at the Air-Water Interface

    Year: 2019

    Journal: ChemPhysChem, Volume 20, 1-Jul, page 1698–1705

    Authors: Mielke, Salome; Abuillan, Wasim; Veschgini, Mariam; Liu, Xianhe; Konovalov, Oleg; Krafft, Marie Pierre; Tanaka, Motomu

    Organizations: French Research AgencyFrench National Research Agency (ANR) [ANR-14-CE35-0028-01]; German Science FoundationGerman Research Foundation (DFG) [DFG Ta259/12]; INTERREG V Upper Rhine Program ("Transcending borders with every project"); Swiss Confederation; Swiss canton of Aargau; Swiss canton of Basel-Landschaft; Swiss canton of Basel-Stadt (NANOTRANSMED ); Konrad-Adenauer Foundation; Alexander von Humboldt FoundationAlexander von Humboldt Foundation; Nakatani Foundation

    Keywords: GISAXS; microbubbles; perfluorohexane; rheology; semifluorinated alkanes

    Semifluorinated alkanes FnHm self-assemble into nanometer-sized surface micelles at the air-water interface. In this study, we investigated how an atmosphere enriched with perfluorohexane (PFH) influences the interfacial viscoelasticity and structural order of a monolayer of FnHm by the combination of dilational rheology and grazing-incidence small-angle X-ray scattering (GISAXS). The monolayers behaved predominantly elastic which can be attributed to the strong dipole repulsions of the surface domains. Enrichment of the atmosphere with PFH lead to an increase of the compressibility and a decrease of the elastic modulus without altering the structural ordering of the FnHm molecules into highly correlated nanodomains, suggesting the adsorption of PFH molecules to the free spaces between the domains. The capability of FnHm domains to retain the structural integrity in the presence of PFH gas is promising for the fabrication of stable microbubbles for sonographic imaging.
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