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Journal Article 
Surface Modification of Nano-Hydroxyapatite with Stearic Acid 
Liao Jian-Guo; Zhang Li; Zuo Yi; Wang Yu-Li; Li Yu-Ban 
Chinese Journal of Inorganic Chemistry / Wu Ji Hua Xue Xue Bao
ISSN: 1001-4861 
In this paper, nano-hydroxyapatite(n-HA) was modified using stearic acid(C17H35COOH), and the interfacial interactions between n-HA and C17H35COOH was also studied. Transmission electron microscopy (TEM), Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectra (XPS) analyses showed that the stearic acid molecular binded strongly to n-HA surface. Ionic bond was formed by the reaction between Ca2+ and C17H35COO-group. Surface modification of HA particles could improve the mechanical strengths of the n-HA/polycarbonate(n-HA/PC) composites dramatically. SEM observation slowed that HA particles uniformly distributed in the PC matrix, both unifies closely, the not obvious interphase boundary, the composite materials break showed the obvious to ductile fracture, increases along with the n-HA inorganic granule content, composite materials break also gradually to ductile and brittle fracture coexistence transformation, indicating that the interfacial interaction between surface-modified inorganic particles and polymer matrix is crucial for the increase of the mechanical strength of the composite. 
nano-hydroxyapatite; stearic acid; polycarbonate; composites