Polarized Raman scattering and low frequency infrared study of hydroxyapatite

In Situ Bone‐Like Apatite Formation From a Bioeutectic® Ceramic in SBF Dynamic Flow

“…The strong peak observed in Fig. 6 at 962 cm −1 is assigned to symmetric stretching PO 4 3− modes, and the bands observed in the frequency regions 400–500, 570–625, and 1020–1095 cm −1 are assigned, respectively, to ν 2 − , ν 4 − , and ν 3 − ‐type internal PO 4 3− modes, in agreement with the bibliographic databases 52–57 . The O–H stretching mode produces an intense Raman peak at 3576 cm −1 , which is absent from TCP.…”

“…6) that the calcium phosphate phase corresponds to an apatite of low crystallinity well differentiated from the original α‐TCP. It is important to emphasize that this technique allows the differentiation between the original α‐TCP phase in the samples and apatite reaction products 52–57 . Consequently, a selective solution of the wollastonite in the SBF is observed, leaving a residual phase of apatite, pseudomorphic with the original α‐TCP phase.…”

Bioeutectic® Ceramics for Biomedical Application Obtained by Laser Floating Zone Method. In vivo Evaluation

“…It is important to emphasize that this technique allowed on differentiation between the original α-TCP phase in the pellets and HA-like reaction products [15–17]. The strong peak observed in Figure 9 at 962 cm −1 is assigned to symmetric stretching PO 4 3− modes, and the bands observed in the frequency regions 400–500, 570–625, 1020–1095 cm −1 are assigned respectively to ν 2 − , ν 4 − , and ν 3 − type internal PO 4 3− modes, in agreement with the bibliographic data bases [15–17]. The O–H stretching mode produces an intense Raman peak at 3576 cm −1 wich is absent from TCP.…”

Multiwalled Carbon Nanotubes Reinforced Hydroxyapatite‐Chitosan Composite Coating on Ti Metal: Corrosion and Mechanical Properties

“…Figure compares the Raman spectra of composite HAp‐chitosan‐MWCNT coating with pristine MWCNT. The composite coating shows several bands at 430, 590, 962, 1047, 1074 cm −1 , corresponds to HAp (several stretching modes of tetrahedron PO 4 3− ) . It also shows three characteristic peaks D, G, and D' band of MWCNT at 1344, 1574, and 2700 cm −1 , respectively .…”

“…). 35 It also shows three characteristic peaks D, G, and D' band of MWCNT at 1344, 1574, and 2700 cm À1 , respectively. 36 It can be seen that compared to pristine MWCNT spectra, intensity of D band increases slightly (D/ G = 0.1 for pristine MWCNT, 0.2 for MWCNT incorporated in the matrix).…”