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Surface Potential of Poly(lactic acid) Composites Containing Calcium Carbonates in Simulated Body Fluid
Author(s) -
Maeda Hirotaka,
Kasuga Toshihiro,
Nogami Masayuki
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00228.x
Subject(s) - simulated body fluid , apatite , calcium , raman spectroscopy , phosphate , adsorption , chemical engineering , lactic acid , chemistry , calcium carbonate , biomineralization , carbonate , ion , materials science , mineralogy , geology , organic chemistry , paleontology , physics , bacteria , optics , engineering
The surface of a poly(lactic acid) composite (CCPC) containing calcium carbonate was reported to show apatite formation in simulated body fluid (SBF) within 24 h at 37°C. In the present work, ζ potentials of CCPC were examined to determine the rapid apatite formation mechanism at an early stage after soaking in SBF. The ζ potentials of CCPC showed negatively charged values in SBF. The potential decreased immediately after soaking, and subsequently increased during 1–6 h of soaking. After 6–9 h of soaking, no change in ζ potentials was observed. Laser Raman spectroscopy results suggested that the change in the ζ potential is closely related to the amount of Ca 2+ ‐coordinated carboxy groups on the CCPC surface. The concentration of phosphate ion in SBF decreased after 6 h. Apatite formation was suggested to begin after 6–9 h of soaking via Ca 2+ coordination to carboxy groups and the subsequent adsorption of phosphate ions.