Effects of Adding Carbon Nanotubes/Hydroxyapatite Composites on the Properties and Structure of Calcium Phosphate Cement

doi:10.3724/SP.J.1077.2013.12226

Abstract

Abstract:

The multi-walled carbon nanotubes (MWNTs)/ hydroxyapatite (HA) composites were synthesized by three different methods, namely physical blending (PB), chemical coprecipitation (CC) and bionic immersion (BI), and used as one of solid phase powders for the preparation of calcium phosphate cement (CPC). For the addition of MWNTs/HA composites, CPC had an increasing hydrophilicity and a decreasing initial and final setting time. However, the initial setting time and final of CPC made of MWNTs/HA powders still met the clinical requirements for the biomedical applications. The addition of MWNTs/HA composites synthesized by different methods had great effect on the compressive properties of CPC and HA crystallinity in CPC, but had no effect on the phase composition of CPC. Compared with blank CPC, CPC-CC and CPC-BI, CPC-PB had the best compressive mechanical properties and the highest HA conversion and content. Compared with blank CPC, the compressive strength and elastic modulus of CPC synthesized by PB method increased 48.23% and 41.87%, respectively.

Key words: calcium phosphate cement, carbon nanotubes, hydroxyapatite, physical blending, chemical coprecipit-

CLC Number:

TB321

QIU Tian, HUANG Jing-Jing, ZHANG Miao, WANG Xian-Fu, LI Chen, LU Xiao-Ying, WENG Jie. Effects of Adding Carbon Nanotubes/Hydroxyapatite Composites on the Properties and Structure of Calcium Phosphate Cement[J]. Journal of Inorganic Materials, 2013, 28(1): 91-96.

Figures/Tables 9

Table 1 Constituents and liquid-solid ratio of CPC

Cements	Constituents				Liquid- solid ratio /(mL·g^-1)
Cements	8.5wt%	58wt%	25wt%	8.5wt%	Liquid- solid ratio /(mL·g^-1)
CPC-Blank	HA	β-TCP	DCPA	CaCO₃	0.35
CPC-PB CPC-CC CPC-BI	MWNTs/HA	β-TCP	DCPA	CaCO₃	0.47

Fig. 1 Initial and final setting time of different CPC samples

Fig. 2 Contact angle and surface energy of different CPC samples

Fig. 3 Stress-strain curves of different CPC samples

Fig. 4 Compressive strength and elastic modulus of different CPC samples

Fig. 5 FTIR spectra of MWNTs/HA powder synthesized by different methods

Fig. 6 SEM photographs of the fracture surface of different CPC samples(arrows: holes among the particles of CPC)

Table 2 Crystal size and content of HA in CPC samples

CPC	CPC-Blank	CPC-PB	CPC-CC	CPC-BI
Crystal size/nm	50.6	63.3	69.2	42.2
Content/wt%	33.97	37.52	31.84	33.57

Fig. 7 XRD patterns of different CPC samples

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