i want to determine the pHpzc of supported or unsupported metal oxides. anyone know please guide me in this regard. Thanks
Dear Shahzad Afzal,
The pzc is typically obtained by acid-base titrations of colloidal dispersions while monitoring the electrophoretic mobility of the particles and the pH of the suspension. Several titrations are required to distinguish pzc from iep, using different electrolytes (including varying the electrolyte ionic strength). Once satisfactory graphs are obtained (acid/base amount—pH, and pH—zeta potential), the pzc is established as the common intersection point (cip) of the lines. Therefore, pzc is also sometimes referred to as cip.
For more on this topic, please see the following links:
http://www.electrochemsci.org/papers/vol7/7076142.pdf
http://www.calpoly.edu/~Cappel/pdf%20files/Geoderma%20PZC.pdf
Hoping this will be helpful,
Rafik
Bundle of thanks Professor Rafik for your fruitful comments. in our lab we have zeta sizer instrument through which we can measure zeta potential at a range of pHs but i want to ask, as compared to titration is that machine can give me accurate value? Your suggestion will be highly appreciated in this regard
Keep the ionische strength constant and use a reference standard to calibrate yor machine.
Article Functionalized polymer colloids bearing primary amino groups
We had used Babic et al. pH drift method for pHzpc analysis of solid materials which gives good results. This needs a good pH meter for pH monitoring.
Dear Shahzad,
To my opinion using Zetasizer Nano ZS can give accurate results.
The following link contains a publication which may be helpful in taking a decision (see pages 46-51.
http://ir.uiowa.edu/cgi/viewcontent.cgi?article=2643&context=etd
Rafik
Thanks Dr Ghosh and Dr Rafik for your valuable guideline. you are quite right.
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