Effect of the molecular structure on the hierarchical self-assembly of semifluorinated alkanes at the air/water interface

Semifluorinated alkanes (C(n)F(2n+1)C(m)H(2m+1)), short FnHm display local phase separation of mutually incompatible hydrocarbon and fluorocarbon chain moieties, which has been utilized as a structure-forming motif in supramolecular architectures. The packing of semifluorinated alkanes, nominally ba...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 27(2011), 14 vom: 19. Juli, Seite 8776-86
1. Verfasser: de Viguerie, Laurence (VerfasserIn)
Weitere Verfasser: Keller, Rabea, Jonas, Ulrich, Berger, Rüdiger, Clark, Christopher G Jr, Klein, Christopher O, Geue, Thomas, Müllen, Klaus, Butt, Hans-Jürgen, Vlassopoulos, Dimitris
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2011
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Alkanes Water 059QF0KO0R
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100 1 |a de Viguerie, Laurence  |e verfasserin  |4 aut 
245 1 0 |a Effect of the molecular structure on the hierarchical self-assembly of semifluorinated alkanes at the air/water interface 
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520 |a Semifluorinated alkanes (C(n)F(2n+1)C(m)H(2m+1)), short FnHm display local phase separation of mutually incompatible hydrocarbon and fluorocarbon chain moieties, which has been utilized as a structure-forming motif in supramolecular architectures. The packing of semifluorinated alkanes, nominally based on dodecyl subunits, such as perfluoro(dodecyl)dodecane (F12H12) and perfluoro(dodecyl)eicosane (F12H20), as well as a core extended analogue, 1,4-dibromo-2-((perfluoroundecyl)methoxy)-5-(dodecyloxy)benzene) (F11H1-core-H12), was studied at the air/water interface. Langmuir monolayers were investigated by means of neutron reflectivity directly at the air/water interface and scanning force microscopy after transfer to silicon wafers. Narrowly disperse surface micelles formed in all three cases; however, they were found to bear different morphologies with respect to molecular orientation and assembly dimensionality, which gives rise to different hierarchical aggregate topologies. For F12H12, micelles of ca. 30 nm in diameter, composed of several circular or "spherical cap" substructures, were observed and a monolayer model with the fluorocarbon block oriented toward air is proposed. F12H20 molecules formed larger (ca. 50 nm diameter) hexagonally shaped surface micelles that were hexagonally, densely packed, besides more elongated but tightly interlocked wormlike structures. Conversely, F11H1-core-H12 films organized into linear rows of elongated surface micelles with comparable width, but an average length of ca. 400 nm, apparently formed by antiparallel molecular packing 
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650 4 |a Research Support, Non-U.S. Gov't 
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700 1 |a Keller, Rabea  |e verfasserin  |4 aut 
700 1 |a Jonas, Ulrich  |e verfasserin  |4 aut 
700 1 |a Berger, Rüdiger  |e verfasserin  |4 aut 
700 1 |a Clark, Christopher G  |c Jr  |e verfasserin  |4 aut 
700 1 |a Klein, Christopher O  |e verfasserin  |4 aut 
700 1 |a Geue, Thomas  |e verfasserin  |4 aut 
700 1 |a Müllen, Klaus  |e verfasserin  |4 aut 
700 1 |a Butt, Hans-Jürgen  |e verfasserin  |4 aut 
700 1 |a Vlassopoulos, Dimitris  |e verfasserin  |4 aut 
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