Comprehensive structural studies of ultra-fine nanocrystalline calcium hydroxyapatite using MAS NMR and FT-IR spectroscopic methods

The Assessment of Bone Deterioration with Nuclear Magnetic Resonance Spectroscopy in a Multidisciplinary Context: The Case of the UNESCO World Heritage Site of Sedlec, Czechia

“…The higher intensity of this resonance has been observed in samples 1, 4, 5 and 7. Figure 2 illustrates an example of 31 P NMR signal deconvolution into a sharp, more intense, component, attributed to the crystalline apatite core, and a less intense but broader component, attributed to the amorphous hydrated surface layer of the mineral platelets (Pajchel et al 2013). The broad component always showed a pure Gaussian shape.…”

“…The quantitative assessment of the relative fractions of P in both compartments can be obtained through the fit of the NMR spectrum (Pajchel et al . ; Kaflak et al . ).…”

“…Useful information could be also conveyed by the analysis of the 31 P NMR spectrum. The 31 P NMR signal, which is a broad peak centred at~3 ppm, has been described as being composed of two components; a narrow line, due to the crystalline apatite core of the mineral platelets, and a broad line, due to their amorphous hydrated surface layer (Pajchel et al 2013). The quantitative assessment of the relative fractions of P in both compartments can be obtained through the fit of the NMR spectrum (Pajchel et al 2013;Kaflak et al 2016).…”

“…The 31 P NMR signal, which is a broad peak centred at~3 ppm, has been described as being composed of two components; a narrow line, due to the crystalline apatite core of the mineral platelets, and a broad line, due to their amorphous hydrated surface layer (Pajchel et al 2013). The quantitative assessment of the relative fractions of P in both compartments can be obtained through the fit of the NMR spectrum (Pajchel et al 2013;Kaflak et al 2016). This information is of relevance with respect to the bone quality, because of the preferential degradation of the amorphous hydrated layer as a consequence of the diagenetic processes (Rollin-Martinet et al 2013).…”

SYNTHESIS OF ULTRAFINE HYDROXYAPATITE IN A Ca(OH)2-H3PO4-H2O REACTION SYSTEM USING ULTRASOUND IRRADIATION

“…In addition, there are many reports on the synthesis of fine HAp, most of which synthesized the HAp by adding organic matter [6][7][8] . Furthermore, fine HAp has also been synthesized using powder jet deposition or microwave solvothermal synthesis 9,10 . To our knowledge, the highest reported specific surface area of HAp is 256 m 2 /g 10 .…”