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

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Bioengineering, Chemistry(all), Atomic and Molecular Physics, and Optics, Materials Science(all), Modelling and Simulation

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