Kinetics of Heterogeneous Nucleation of Calcium Phosphates on Anatase and Rutile Surfaces

The heterogeneous nucleation of calcium phosphates including octacalcium phosphate (Ca4H(PO4)3·2.5H2O), hydroxyapatite (Ca5(PO4)3OH, HAP), and fluorapatite ((Ca5(PO4)3F, FAP) on anatase and rutile surfaces has been studied in solutions supersaturated with respect to each phase. Induction periods pre...

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Bibliographic Details
Published in:Journal of colloid and interface science 1998-03, Vol.199 (2), p.206-211
Main Authors: Wu, Wenju, Nancollas, George H.
Format: Article
Language:English
Subjects:
anatase
calcium phosphates
Chemistry
contact angle
crystal growth kinetics
Exact sciences and technology
General and physical chemistry
interfacial tension
rutile
Solid-liquid interface
surface free energy
Surface physical chemistry
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Summary:The heterogeneous nucleation of calcium phosphates including octacalcium phosphate (Ca4H(PO4)3·2.5H2O), hydroxyapatite (Ca5(PO4)3OH, HAP), and fluorapatite ((Ca5(PO4)3F, FAP) on anatase and rutile surfaces has been studied in solutions supersaturated with respect to each phase. Induction periods preceding the initial crystal growth of the calcium phosphate phases varied markedly with relative supersaturation. At the same relative supersaturation, the induction time for calcium phosphate nucleation on anatase surfaces was much shorter than that on rutile surfaces. The surface properties of these titanium oxides were characterized by ζ-potential measurements and by contact angle measurements involving a thin layer wicking technique. The major difference between the surfaces was in the Lewis base surface tension parameters, γ−S, 48 and 16 mJ m−2for anatase and for rutile, respectively.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1997.5329