I am studying anodic oxidation of Ti and devoting to coat hydroxyapatite (Ca10(PO4)6OH2) on Ti. During anodic oxidation, Ti was set as anode and a Ti oxide formed on the Ti surface. I would like to make hydroxyapatite powder incorporating into Ti oxide film during anodic oxidation. Ti is anode and therefore making hydroxyapatite be negative charged is helpful to increase the amounts of hydroxyapatite on Ti oxide. The electrolyte I used is aqueous solution containing 10 % (v/v) phosphoric acid. I am searching for some materials can bond or chelate with hydroxyapatite particle to make hydroxyapatite be negative charged in the aqueous solution.
You may have to adjust the pH. With out significant modification, the surface charge of the particle will be a function of the PZC of the material and the pH relative to that value. Of course that will change the electrochemical aspects as well.
Stoichiometric TiO2 surfaces are usually weakly acidic with a wide range of pKa's. The surface will become more negatively charged the higher the pH.
The reference below has a nice summary of the acid/base properties of TiO2:
K. Tanabe, M. Misono, Y. Ono, and H. Hattori, New Solid Acids and Bases. Kodansha Ltd., 1989.
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