Working Paper Review Version 1 This version is not peer-reviewed

Structural Changes of Hydroxylapatite During Plasma Spraying: Raman and NMR Spectroscopy Results

Version 1 : Received: 4 August 2021 / Approved: 5 August 2021 / Online: 5 August 2021 (11:06:47 CEST)

How to cite: Heimann, R.B. Structural Changes of Hydroxylapatite During Plasma Spraying: Raman and NMR Spectroscopy Results. Preprints 2021, 2021080142 Heimann, R.B. Structural Changes of Hydroxylapatite During Plasma Spraying: Raman and NMR Spectroscopy Results. Preprints 2021, 2021080142

Abstract

Functional osseoconductive coatings based on hydroxylapatite (HAp) and applied preferentially by atmospheric plasma spraying to medical implant surfaces are a mainstay of modern implantology. During contact with the hot plasma jet, HAp particles melt incongruently and undergo complex dehydration and decomposition reactions that alter their phase composition and crystallographic symmetry, and thus, the physical and biological properties of the coatings. Surface analytical methods such as laser-Raman and nuclear magnetic resonance (NMR) spectroscopies are useful tools to assess the structural changes of HAp imposed by heat treatment during their flight along the hot plasma jet. In this contribution, the controversial information on the existence or non-existence of oxyapatite, i.e. fully dehydrated HAp as a thermodynamically stable compound is highlighted.

Keywords

hydroxylapatite, oxyhydroxylapatite, oxyapatite, tricalcium phosphate, tetracalcium phosphate, Raman spectroscopy, MAS-CP NMR spectroscopy, 2D-HETCOR NMR spectroscopy.

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