Kinetic Studies on the Synthesis of Hydroxyapatite Nanowires by Solvothermal Methods

Shiying Zhang; Chen Lai; Kun Wei; Yingjun Wang

doi:10.1071/CH06117

RESEARCH ARTICLE

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Kinetic Studies on the Synthesis of Hydroxyapatite Nanowires by Solvothermal Methods

Shiying Zhang ^A , Chen Lai ^B ^D , Kun Wei ^B ^C and Yingjun Wang ^B

+ Author Affiliations

- Author Affiliations

^A College of Materials Science and Engineering, Changsha University, Changsha 410082, China.

^B Key Laboratory of Specialty Functional Materials and Advanced Manufacturing Technology of Ministry of Education, College of Materials Science and Engineering, South China University of Technology , Guangzhou 510641, China.

^C Key Laboratory of Advanced Materials and Rheological Properties, Xiangtan University, Xiangtan 411105, China.

^D Corresponding author. Email: laichen1110@msn.com

Australian Journal of Chemistry 60(2) 99-104 https://doi.org/10.1071/CH06117
Submitted: 8 April 2006 Accepted: 2 July 2006 Published: 13 February 2007

Abstract

Hydroxyapatite nanowires with a high axial ratio have been synthesized in reverse micelle solutions that consist of cetyltrimethylammonium bromide (CTAB), n-pentanol, cyclohexane, and the reactant solution by solvothermal methods. This paper focusses on the kinetic studies of the solvothermal reaction and the linear growth of hydroxyapatite nanowires. When the reaction was carried out at low temperatures (65°C), the experimental results showed that the reaction rate was of zero order since the whole reaction was diffusion controlled with constant diffusion coefficients. In the middle to high temperature range (130–200°C), the kinetics were characterized by second order reaction kinetics. Since the controlling factor was activation energy and the apparent activation energy was large, the reaction rate was more sensitive to the temperature. Therefore, the exponent of the reaction rate constant increased by two when the temperature was increased from 130 to 200°C. By calculating the yields of products and the specific surface areas at different times, the linear and overall growth rate equations of the hydroxyapatite nanowires could be obtained. The experimental effective growth order of the crystals was 11. The larger growth order indicated that the crystal could grow more effectively in one direction because of the induction of the surfactant in the experiment system.

Acknowledgments

This study was supported by the National Nature Science Foundation of China (59932050, 50272021) and the Open Project Program of Key Laboratory of Advanced Materials and Rheological Properties (Xiangtan University), Ministry of Education, China (no. 10kz/kz07019).

References

Kinetic Studies on the Synthesis of Hydroxyapatite Nanowires by Solvothermal Methods

Abstract

Acknowledgments

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