Inorganic Particles as Colloidal Models. Effects of Size and Shape on the Electrokinetics of Hematite (α-Fe_2O-3)

摘要

This paper deals with the electrokinetics of α-Fe_2O-3 (hematite) particles with the aim of checking their possible use as colloidal models. The key idea is that, since hematite can be prepared, in a controlled and reproducible way, as colloidal particles homogene- ous in size and shape, these could be considered as model colloids to which theories developed for systems of given geometry might be applied. In this contribution, we first describe the electropho- retic mobility, μ_e, of pseudospherical hematite samples with very different diameters as a function of NaCl and CaCl_2 concentra- tions.