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Coreño, J. et al.

Coreño, Martínez, Bolarín, Sánchez,

Apatite nucleation on silica surface: a zeta potential approach.

Zeta potential measurements on pure silica, prepared by the sol-gel method from tetraethoxysilane under acidic conditions, are reported in different suspensions. Water suspensions and suspensions containing calcium or phosphate ions with and without NaCl were tested. zeta potential measurements were carried out as a function of the pH and ion concentration. Also, calcium and phosphate adsorption on silica was determined experimentally. The results of zeta potential and adsorption measurements suggest that both calcium and phosphate ions can be adsorbed on the silica surface; however, calcium adsorption is stronger than phosphate adsorption. When calcium and sodium ions are present in the suspension, calcium adsorption decreases. It seems that certain sites on the silica surface are specific for calcium adsorption.[1]

References

Apatite nucleation on silica surface: a zeta potential approach. Coreño, J., Martínez, A., Bolarín, A., Sánchez, F. J. Biomed. Mater. Res. (2001) [Pubmed]

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