Synthesis and Orientation of Fe-doped Hydroxyapatite in High Magnetic Field

doi:10.15541/jim20170137

Abstract

Abstract:

The surface nanostructure of bioceramics can affect osteoblast proliferation and differentiation, therefore the control of the surface microstructure of bioceramics, especially grain orientation before the ceramic sintering, is one of key to design and develop bioactive ceramics for bone regeneration. This study aimed to investigate the crystal orientation of Fe-doped hydroxyapatite in high magnetic field. Pure hydroxyapatite (HA) and Fe-doped hydroxyapatite (Fe-HA) powders were prepared by co-precipitation method and co-precipitation-hydrothermal method, and their phase composition, microstructure, magnetic property, and elementary composition were analyzed by XRD, SEM, TEM, PPMS, and ICP. The results showed that the phase of Fe-HA is the same as HA with no impurity phase. HA is diamagnetic originally, while Fe-HA becomes paramagnetic. The microstructure of samples prepared by co-precipitation method is needle cluster-like but that prepared by co-precipitation-hydrothermal method is rod-like. It is the rad-like but not the needle cluster-like Fe-HA can be orientated in high magnetic field. Therefore, the orientation of rod-like Fe-HA can be regulated by high magnetic field. Furthermore, pure HA cannot be uniaxial orientated in single-directed high magnetic field. while Fe-HA can be oriented along c axis in certain degree in single- directed high magnetic field.

Key words: Fe-HA, high magnetic field, paramagnetic, orientate

CLC Number:

TQ174

WANG Xiao-Long, REN Zhong-Ming, CHANG Jiang. Synthesis and Orientation of Fe-doped Hydroxyapatite in High Magnetic Field[J]. Journal of Inorganic Materials, 2018, 33(1): 75-80.

Figures/Tables 8

Fig. 1 XRD patterns of the samples doped with 1mol%, 2mol%, 5mol% Fe ion^(a) Co-precipitation; (b) Coprecipitation-hydrothermal

Fig. 2 B-H curves of sample

Table 1 Elemental composition of four kinds of samples

Sample	Fe/Ca	Ca/P	(Ca+Fe)/P
S1	0.050	1.561	1.639
S2	0.052	1.580	1.663
S3	0.052	1.583	1.665
S4	0.051	1.589	1.669

Fig. 3 SEM images of Fe-HA and HA^(a) Co-precipitation Fe-HA; (b) Coprecipitation-hydrothermal Fe-HA; (c) Coprecipitation-hydrothermal HA

Fig. 4 TEM images of Fe-HA and HA prepared with different methods^(a) Co-precipitation HA; (b) Co-precipitation Fe-HA; (c) Coprecipitation-hydrothermal HA; (d) Coprecipitation-hydrothermal Fe-HA

Fig. 5 XRD patterns of the samples with different dispersant casting in high magnetic field

Fig. 6 XRD patterns of Fe-HA and HA samples casting in high magnetic field^(a) Coprecipitation-hydrothermal Fe-HA; (b) Coprecipitation-hydrothermal HA; (c) Co-precipitation Fe-HA

Fig. 7 Orientation principle of HA/Fe-HA in high magnetic field^(a) Effect of dispersant on HA orientation; (b) Effect of Fe ions on the orientation of HA

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