title: Probing diffusion of single nanoparticles at water-oil interfaces.
abstract: The diffusion of nanoparticles at a water-alkane interface is studied using fluorescence correlation spectroscopy. Hydrophilic and hydrophobic quantum dots of 5, 8, and 11 nm radius are used. A slow-down of nanoparticle diffusion at the liquid-liquid interface is observed. The effect is most evident when the viscosities of both liquid phases are similar, here, at the water-decane interface. In this case, the interfacial diffusion coefficients of the hydrophilic particles are 1.5 times and those of the hydrophobic particles 2 times lower than the corresponding bulk values.
authors.affiliation: Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Wang
authors.forename: Stoyan
authors.initials: S
authors.lastname: Yordanov
authors.forename: Harsha Mohan
authors.initials: HM
authors.lastname: Paroor
authors.forename: Ashis
authors.initials: A
authors.lastname: Mukhopadhyay
authors.forename: Christopher Y
authors.initials: CY
authors.lastname: Li
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt
authors.forename: Kaloian
authors.initials: K
authors.lastname: Koynov
mesh_terms: D000473:Alkanes / Q000737:chemistry; D004058:Diffusion; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry*; D009821:Oils / Q000737:chemistry*; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D000473:Alkanes; D009821:Oils; D014867:Water