Hydrothermal Synthesis of Hydroxyapatite Fibers Precipitated by Propionmide

doi:10.3724/SP.J.1077.2013.12254

Abstract

Abstract:

Fibrous hydroxyapatite (HA) powder was successfully synthesized through hydrothermal method. Calcium nitrate tetrahydrate and diammonium hydrogen phosphate were added as precursors and propionamide (PA) as precipitant was used to control the degree of supersaturation of the reaction solution. XRD, FTIR, SEM and TEM were used to characterize the product. The synthesized HA powder was found to possess high crystallinity and regular morphology, as well as good dispersion. The effects of starting pH value and the concentration of precursors on the morphology, constitution, crystallinity and the growth characteristics of HA were investigated. The results show that the starting pH and concentration significantly affect the morphology at different extents, but not on the constitution and crystallinity. In fact, low starting pH controls orientation of fibrous HA while low concentration widens HA fibers.

Key words: hydroxyapatite, propionamide, fiber, hydrothermal synthesis

CLC Number:

TB321

HAO Li-Jing, YANG Hui, ZHAO Na-Ru, WANG Ying-Jun. Hydrothermal Synthesis of Hydroxyapatite Fibers Precipitated by Propionmide[J]. Journal of Inorganic Materials, 2013, 28(1): 63-68.

Figures/Tables 8

Table 1 Formulation and reactional condition of hydrothermal synthesis

[Ca] /(mmol·L^-1)	Initial pH	Final pH
60	1	5.03
60	2	5.46
60	3	5.53
60	4	5.50
60	5	5.58
20	3	5.85
40	3	5.55
80	3	5.33
100	3	5.22

Fig. 1 SEM images of fibrous HA products under various starting pH values (a) pH=1; (b) pH=2; (c) pH=3; (d) pH=4; (e) pH=5

Fig. 2 SEM images of fibrous HA products under various [Ca2+]

Fig. 3 XRD patterns of fibrous HA products under various starting pH value

Fig. 4 XRD patterns of fibrous HA under various [Ca]

Fig. 5 FTIR spectra of fibrous HA under various staring pH values

Fig. 6 FTIR spectra of fibrous HA under various [Ca2+]

Fig. 7 TEM image (a) and SAED pattern (b) of synthesized fibrous HA

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