Publikationen

SAXS studies on silica nanoparticle aggregation in a humid atmosphere

Autor(en)
Ewa Partyka-Jankowska, Sabine Leroch, Johanna Akbarzadeh, Silvia Pabisch, Martin Wendland, Herwig Peterlik
Abstrakt

The influence of varying moisture conditions on the properties of amorphous silica nanoparticles was investigated. 10 nm silica particles in powder form were measured by small-angle X-ray scattering at different relative humidities ranging from 20 to 84 % at 45 °C. The data were analyzed using the generalized inverse Fourier transform method which enables separation of intra- and interparticle contribution to the scattering intensities. The former accounts for shape, size, homogeneity, and polydispersity of scattered nanoscaled objects, the latter describes the forces acting between the particles in the system. Formation of a water layer, of a thickness depending on the water content, covering the silica spheres has been detected. The pair correlation function derived from the structure factor shows a higher degree of structural order with increasing relative humidity. A model of ordering of silica nanoparticles is proposed.

Organisation(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
Universität für Bodenkultur Wien, Max-Planck-Institut für Kolloid- und Grenzflächenforschung
Journal
Journal of Nanoparticle Research: an interdisciplinary forum for nanoscale science and technology
Band
16
Anzahl der Seiten
9
ISSN
1388-0764
DOI
https://doi.org/10.1007/s11051-014-2642-5
Publikationsdatum
2014
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie, 104017 Physikalische Chemie, 210006 Nanotechnologie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/saxs-studies-on-silica-nanoparticle-aggregation-in-a-humid-atmosphere(2d92daf0-8038-49f9-a2df-7a133f46393e).html