Raman spectroscopy).19 Figure 7. 19F MAS NMR spectra of (a) FAP samplesRaman spectroscopy).19 Figure 7.

Raman spectroscopy).19 Figure 7. 19F MAS NMR spectra of (a) FAP samples
Raman spectroscopy).19 Figure 7. 19F MAS NMR spectra of (a) FAP samples and (b)(b) curve fitting FAP-800 samples (1. WZ8040 Epigenetics crystalline phase, two. apaFigure 7. F MAS NMR spectra of (a) FAP samples and curve fitting of of FAP-800 samples (1. crystalline phase, 2. apatite-like boundary layer from FOHAP, three. amorphous phase). tite-like boundary layer from FOHAP, 3. amorphous phase).As expected, Diversity Library medchemexpress inside the fluoridated samples spectra, no signal from hydroxyl the conven31P MAS NMR spectra have been recorded by three diverse experiments: groups was observed at 0.0 ppm, while (BlochdifferentBD) and had been cross-polarization experiments: tional single pulse-acquire three decay, signals two observed: stronger at 1.5 ppm, weaker at 1.0 ppm, in addition to a weak blur at 7.0 ppm. The 1.5 ppm line possibly originated from protons to phosphorus-31 nuclei and from fluorine-19 to phoshorus-31 nuclei (CP, – ions getting into the columns [7,30]. Ren et al. [7] from 31 19 from OH- 1H protons 31P). Each of the groups close to F P, F spectra showed the principle signal at around three ppm. recommended that the 0.0 ppm signal in HAP is assigned for the OH group, carrying the–O The 31P BD experiment (Figure 8a) showed the total content and distribution of phosO O O –motif within the HAP structure [7]. When OH- is replaced with F- ions in phorus-31 nuclei. All spectra (except HAP-1200) contained one particular signal using a position of your FAP, an–O O O F–motif is formed, resulting in a 1.five ppm signal. It has also 3.1 ppm for HAPs and 3.5 ppm for fluoridated samples. The signal at around three.1 been observed in HAP samples that as the heating temperature increases, the 1.5 ppm ppm was characteristic for pure, unsubstituted HAP. In turn, the signal at 3.five ppm (presignal decreases. The presence of this signal (and its loss at greater temperatures) confirmed sent in F-substituted apatites spectra) was composed of two lines: at three.1 ppm and at three.five ppm. We assumed that the signal at 3.five ppm may well be the result on the presence of F- ions within the channel along c-axis (see Figure S4 in Supplementary Components). The look of an added signal at six.7 ppm for HAP-1200 confirmed previously observed decomposition of the sample and formation on the second phase (-TCP).Materials 2021, 14, x FOR PEER REVIEW11 ofMaterials 2021, 14,for both uncomplicated varieties and was a great deal weaker for fluoridated apatite signals than for HAPs. This was resulting from the reduced intensity of your OH groups in substituted apatites and their loss 10 of 13 because the temperature improved. These experiments unequivocally confirmed the FOHAP nature of synthesized fluoride-substituted apatite supplies. The cross-polarization (CP, 19F31P) experiment (shown in Figure 8c) revealed phosthat the obtained fluoride-substituted environment. FOHAP. OH ions remained in them phorus nuclei with fluorides in their apatites have been and lowered with increasing temperature. In turn,of 13P MAS signal spectra) experiments The CP, 19F31P (normalized towards the intensity the broad NMR (about 7 ppm) was 1 from surface HPO4 2- [31]. no signal for HAPs, asin the surface layer, this signal for all F(for all samples) showed Owing for the disorder expected, in addition to a single H line shape was incredibly broad. decreasing with escalating heating temperature. substituted apatites,Figure eight. NMR spectra of (a) 31 P BD MAS NMR; (b) 1 H31 P CP MAS NMR; and (c) 19 F31 P CP MAS NMR. Figure eight. NMR spectra of (a) 31P BD MAS NMR; (b) 1H31P CP MAS NMR; and (c) 19F31P CP MAS NMR.MAS NMR spectra for fluoridated sampl.