Electrokinetic properties of colloid calcium phosphate

Electrokinetic properties of colloid calcium phosphates, i. e. dicalcium phosphate dihydrate (brushite), tricalcium phosphate, hydroxyapatite, have been determined in different media. Obtained Z-values ranging from -29 to +21 mV indicate the ability of calcium phosphate particles to adsorb both cations (Mg²⁺, Ca²⁺) and anions (OH^-, NO₃^-, CO₃^2-, HPO₄²). Dicalcium phosphate dihydrate ζ -potential values are positively shifted by 2-9 mV as compared to that of hydroxyapatite, and ζ -potentials of tricalcium phosphate and hydroxyapatite differ slightly by 1-3 mV owing to its apatitic nature. During the maturation of hydroxyapatite, its absolute Z-potential values are gradually increased from +6 to +22 mV and from -19 до -27 mV due to the lowering of Ca²⁺ content in mother solution rather than an increase of Ca/P molar ratio of dispersed phase. According to the data obtained, the electrokinetic properties of calcium phosphate particles are rather determined by their crystal structure than by Ca/P molar ratio.

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