https://doi.org/10.1140/epjst/e2009-00948-1
In situ observation of maghemite nanoparticle adsorption at the water/gas interface
1
Fakultät Physik/DELTA, Technische Universität Dortmund, Maria-Goeppert-Mayer Str. 2, 44227 Dortmund, Germany
2
Fakultät Chemie, Technische Universität Dortmund, Otto Hahn Str. 6, 44227 Dortmund, Germany
3
Deutsches Elektronen Synchrotron (HASYLAB), Notkestraße 85, 22607 Hamburg, Germany
Corresponding author: michael.paulus@uni-dortmund.de
The adsorption of 
(maghemite) nanoparticles at the aqueous solution/gas interface was investigated by x-ray reflectivity. Two different concentrations (0.07 g/L and 0.7 g/L) were probed. The x-ray reflectivities indicate the adsorption of nanoparticles at the liquid surface for the highly concentrated solution, while no nanoparticle adsorption could be detected at the surface of the low concentrated solution within several hours. The vertical electron density profile of the high concentration solution/gas interface indicates the formation of a low ordered monolayer of nanoparticles occupying only 6% of the interfacial region.
© EDP Sciences, Springer-Verlag, 2009
