Abstract
Hydroxyapatite (HAp) deposition onto positively charged surfaces (i.e., self‐assembled monolayers (SAMs) terminated with NH2 head groups) and negatively charged surfaces (i.e., OH‐SAMs (weak) and COOH‐SAMs (strong)) soaked at 50°C in aqueous supersaturated solutions (1.5 SBF, pH 7.0–7.6; SBF = simulated body fluid) was investigated using a quartz‐crystal microbalance. The results revealed that the solution conditions greatly influenced the formation of HAp on the charged surfaces. In a stable supersaturated solution of simulated body fluid (1.5 SBF, pH <7.4), more strongly negative surfaces had a more powerful induction capability for the heterogeneous nucleation of HAp (COOH > OH), whereas nucleation was obviously prohibited on a positive surface (NH2‐SAM). On the other hand, after the calcium phosphate particles had nucleated homogeneously in an unstable soaking solution (1.5 SBF, pH ≧7.4), adhesion of the HAp microparticles to the NH2‐SAM was observed. A two‐step interaction is conceivable to describe the formation of HAp on the positive NH2‐SAM: At the first stage, electrostatic interaction dominates the adhesion of HAp microparticles; at the second stage, hydrogen bonds possibly form between the HAp microparticles and the amino head groups of the NH2‐SAM, for a firm bonding with the substrate, and the microparticles grow progressively into a thin film. The electrophoretic behaviors of the HAp microparticles confirmed this hypothesis.
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Dates
Type | When |
---|---|
Created | 16 years, 1 month ago (July 18, 2009, 12:27 a.m.) |
Deposited | 1 year, 9 months ago (Nov. 22, 2023, 8:55 p.m.) |
Indexed | 3 weeks, 5 days ago (Aug. 7, 2025, 4:59 p.m.) |
Issued | 22 years, 4 months ago (May 1, 2003) |
Published | 22 years, 4 months ago (May 1, 2003) |
Published Online | 20 years, 8 months ago (Dec. 20, 2004) |
Published Print | 22 years, 4 months ago (May 1, 2003) |
@article{Zhu_2003, title={Investigation of Apatite Deposition onto Charged Surfaces in Aqueous Solutions Using a Quartz‐Crystal Microbalance}, volume={86}, ISSN={1551-2916}, url={http://dx.doi.org/10.1111/j.1151-2916.2003.tb03375.x}, DOI={10.1111/j.1151-2916.2003.tb03375.x}, number={5}, journal={Journal of the American Ceramic Society}, publisher={Wiley}, author={Zhu, Peixin and Masuda, Yoshitake and Yonezawa, Tetsu and Koumoto, Kunihito}, year={2003}, month=may, pages={782–790} }