title: Layer with reduced viscosity at water-oil interfaces probed by fluorescence correlation spectroscopy.
abstract: The two-dimensional diffusion of isolated molecular tracers at the water-n-alkane interface was studied with fluorescence correlation spectroscopy. The interfacial diffusion coefficients of larger tracers with a hydrodynamic radius of 4.0 nm agreed well with the values calculated from the macroscopic viscosities of the two bulk phases. However, for small molecule tracers with hydrodynamic radii of only 1.0 and 0.6 nm, notable deviations were observed, indicating the existence of an interfacial region with reduced effective viscosity and increased mobility.
authors: Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors: Dapeng
authors: D
authors: Wang
authors: Leonid
authors: L
authors: Pevzner
authors: Chen
authors: C
authors: Li
authors: Kalina
authors: K
authors: Peneva
authors: Christopher Y
authors: CY
authors: Li
authors: Derek Y C
authors: DY
authors: Chan
authors: Klaus
authors: K
authors: Müllen
authors: Markus
authors: M
authors: Mezger
authors: Kaloian
authors: K
authors: Koynov
authors: Hans-Jürgen
authors: HJ
authors: Butt
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D004058:Diffusion; D009821:Oils / Q000737:chemistry*; D010316:Particle Size; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013499:Surface Properties; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D000473:Alkanes; D009821:Oils; D014867:Water