title: Sticking polydisperse hydrophobic magnetite nanoparticles to lipid membranes.
abstract: The formation of a layer of hydrophobic magnetite (Fe(3)O(4)) nanoparticles stabilized by lauric acid is analyzed by in situ X-ray reflectivity measurements. The data analysis shows that the nanoparticles partially disperse their hydrophobic coating. Consequently, a Langmuir layer was formed by lauric acid molecules that can be compressed into an untilted condensed phase. A majority of the nanoparticles are attached to the Langmuir film integrating lauric acid residue on their surface into the Langmuir film. Hence, the particles at the liquid-gas interface can be identified as so-called Janus beads, which are amphiphilic solids having two sides with different functionality.
authors.affiliation: TU Dortmund, Fakultät Physik/DELTA, Maria Goeppert Mayer Strasse 2, 44227 Dortmund, Germany. michael.paulus@uni-dortmund.de
authors.forename: Michael
authors.initials: M
authors.lastname: Paulus
authors.forename: Patrick
authors.initials: P
authors.lastname: Degen
authors.forename: Thorsten
authors.initials: T
authors.lastname: Brenner
authors.forename: Sebastian
authors.initials: S
authors.lastname: Tiemeyer
authors.forename: Bernd
authors.initials: B
authors.lastname: Struth
authors.forename: Metin
authors.initials: M
authors.lastname: Tolan
authors.forename: Heinz
authors.initials: H
authors.lastname: Rehage
mesh_terms: D000327:Adsorption; D002462:Cell Membrane / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D007850:Lauric Acids / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D005740:Gases; D007850:Lauric Acids; D058185:Magnetite Nanoparticles; D014867:Water; C030358:lauric acid