Original scientific paper

Effect of Charge Distribution on the Stability of Nano-dispersions

Nikola Kallay ; Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
Tajana Preočanin ; Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
Davor Kovačević ; Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia

Abstract

In the course of aggregation of very small colloid particles, i.e. nano-particles, the overlap of the diffuse layers is almost complete, so that one cannot apply the common DLVO theory. Since nano-particles are small compared to the extent of the diffuse layer, the process is considered in the same way as for two interacting ions. Therefore, the Brønsted concept based on the Transition State Theory was applied. In this work the effect of charge distribution among nano-particles was examined. Results of numerical simulation show that wider charge distribution causes substantial decrease in the stability of nano-dispersions.

Keywords

nano-dispersions; colloid stability; charge distribution

Hrčak ID:

39699

URI

https://hrcak.srce.hr/39699

Publication date:

15.7.2009.

Visits: 1.527 *