I have gama-Fe2O3/carbon nanotube nanohybride and I need to know the pH at which the surface charge is zero. This can be achieved using zeta potential but I wanted to know if there is any chemical procedure like acid-base titration to measure that pH?
You can use the Isoelectric focusing (IEF) technique "gel electrophoresis": (pH of your focused protein and for more accurate results you can use reference IEF markers)
Goodluck
Maliheh, you might check the 2002 thesis of Magnus Gunnarsson from U. Goteborg. It is available on the web and it is titled "Surface Complexation at the Iron Oxide/Water Interface". Magnus studied colloidal hematite and goethite by potentiometric titration and acoustophoretic measurement. Number and type of functional sites assumptions have to be made to get IEP from titration and perhaps your carbon may have some oxidation/nitrogen defects(?) that might confound it, but if bulk of behavior is iron oxide like then maybe Magnus's work describes how you might do it via titration.
Dear Ms. Pashai;
Enclosed I have attached a file for measurement and application of Zeta potential which it maybe useful for your works. However I have the same idea with comments of Mike. Regards, HH
Thank you very much.I read the thesis and I found it great. it was of great help Mike Bender.
That is so kind of you Mr Haghi for helping me through this problem
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