IEP as a parameter characterizing the pH-dependent surface charging of materials other than metal oxides

2012 ◽  
Vol 171-172 ◽  
pp. 77-86 ◽  
Author(s):  
Marek Kosmulski
Keyword(s):  
Metal Oxides ◽  
Surface Charging ◽  
Ph Dependent

scholarly journals The Isoelectric Point of an Exotic Oxide: Tellurium (IV) Oxide

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3136
Author(s):  
Marek Kosmulski ◽  
Edward Mączka
Keyword(s):  
Zeta Potential ◽  
Metal Oxides ◽  
Isoelectric Point ◽  
Inorganic Ions ◽  
Ionic Surfactants ◽  
Surface Charging ◽  
Ph Dependent ◽  
Ph Range

The pH-dependent surface charging of tellurium (IV) oxide has been studied. The isoelectric point (IEP) of tellurium (IV) oxide was determined by microelectrophoresis in various 1-1 electrolytes over a concentration range of 0.001–0.1 M. In all electrolytes studied and irrespective of their concentration the zeta potential of TeO2 was negative over the pH range 3–12. In other words the IEP of TeO2 is at pH below 3 (if any). TeO2 specifically adsorbs ionic surfactants, and their presence strongly affects the zeta potential. In contrast the effect of multivalent inorganic ions on the zeta potential of TeO2 is rather insignificant (no shift in the IEP). In this respect TeO2 is very different from metal oxides.

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