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  FTIR and electron microscopy observed consequences of HCl and CO2 interfacial interactions with synthetic and biological apatites: Influence of hydroxyapatite maturity

Mekhemer, G. A. H., Bongard, H., Shahin, A. A. B., & Zaki, M. I. (2019). FTIR and electron microscopy observed consequences of HCl and CO2 interfacial interactions with synthetic and biological apatites: Influence of hydroxyapatite maturity. Materials Chemistry and Physics, 221(1), 332-341. doi:10.1016/j.matchemphys.2018.09.007.

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 Creators:
Mekhemer, Gamal A. H.1, Author
Bongard, Hans2, Author              
Shahin, Adel A. B.3, Author
Zaki, Mohamed I., Author
Affiliations:
1Chemistry Department, Faculty of Science, Minia University, El-Minia, 61519 Egypt, ou_persistent22              
2Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              
3Zoology Department, Faculty of Science, Minia University, El-Minia, 61519 Egypt, ou_persistent22              

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Free keywords: Synthetic apatites; Boplogical apatites; HCl-acidification; Co2-carbonation; Hydroxyapatite maturity; Compositional/morphological consequences
 Abstract: HCl and CO2 are active participant molecules in the re-modeling phase of bone materials of vertebrates, wherein old bone is dissolved (resorbed) by osteoclast cells (HCl acid and collagenase secreting cells) and new bone becomes deposited (mineralized) by osteoblast cells. The mineralization process results in the deposition of mature (i.e., non-carbonated) or immature (i.e., partially carbonated) hydroxyapatite (HAP), which may involve CO2-carbonation, depending on the function of the perceived bone (e.g., non-dissolvable tooth enamel bone or dissolvable skeletal bone). The present investigation adopted a surface chemical approach to examine impacts of interfacial interactions of wet HCl vapor (at 673 K) and CO2 gas molecules (at 298 K) on the chemical composition and particle morphology of synthetic and biological apatite (AP) materials of varied contents of mature HAP. Studies employing X-ray powder diffractometry, Fourier-transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray micro-probing were carried out. Accordingly, high relative crystallinity, extent of hydroxylation and Ca/P atomic ratio were found to discern synthetic from biological APs. Furthermore, results obtained helped revealing that (i) compositional (atomic ratios, and extents of hydroxylation and carbonation) and morphological (particle shape and agglomeration) parameters are more diagnostic to the HAP maturity than the geometric structural (crystallization and crystallinity) parameters, (ii) the higher the maturity of the contained HAP, the higher is the resistance of chemical integrity and morphology of the AP material particles to the HCl-acidification, and (iii) a preceding CO2-carbonation lessens HAP-maturity of the AP materials thus rendering them more vulnerable to retrogressive chemical and morphological consequences of the acidification.

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Language(s): eng - English
 Dates: 2018-02-102018-09-012018-09-132019-01-01
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.matchemphys.2018.09.007
 Degree: -

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Title: Materials Chemistry and Physics
  Abbreviation : Mater. Chem. Phys.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier
Pages: - Volume / Issue: 221 (1) Sequence Number: - Start / End Page: 332 - 341 Identifier: ISSN: 0254-0584
CoNE: https://pure.mpg.de/cone/journals/resource/954928577762