PMID: 15348653Sep 7, 2004Paper

Structural analysis of Si-substituted hydroxyapatite: zeta potential and X-ray photoelectron spectroscopy

Journal of Materials Science. Materials in Medicine
Claudia M BotelhoJ D Santos

Abstract

The aim of this study was to determine the effect of the incorporation of silicon on the surface charge of hydroxyapatite (HA) and to assess surface structural changes of HA and Si-HA induced by dissolution in both static and dynamic systems. X-ray photoelectron spectroscopy (XPS) analysis showed that SiO(4)(4-) groups were substituted for PO(4)(3-) groups in the silicon-hydroxyapatite (Si-HA) lattice according to a previously proposed substitution mechanism without the formation of other crystalline phases, such as tricalcium phosphate or calcium oxide. The substituted silicon induced a decrease in the net surface charge and the isoelectric point of HA as determined by zeta potential (ZP) measurements. At physiological pH=7.4 the surface charge of Si-HA was significantly lowered compared to unmodified HA, i.e. -50+/-5 to -71+/-5 eV, caused by the presence of silicate groups in the HA lattice, which may account for a faster in vitro apatite formation using SBF testing. XPS results indicated that silicon seems to be preferentially leached out from Si-HA surface compared to other ionic species after dissolution studies in tris-buffer using a dynamic system.

Citations

Dec 21, 2006·Journal of Materials Science. Materials in Medicine·H F Chappell, P D Bristowe
Apr 5, 2013·Journal of Biomedical Materials Research. Part a·Ming-You ShieShinn-Jyh Ding
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Sep 29, 2011·Journal of Biomedical Materials Research. Part B, Applied Biomaterials· Aniket, Ahmed El-Ghannam
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Mar 11, 2017·Journal of Biomedical Materials Research. Part a·Xianfeng ZhouNita Sahai
Jul 3, 2021·Nanomaterials·Zully Matamoros-VelozaBenjamin Moreno-Perez

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