Fabrications of Boron-Containing Apatite Ceramics via Ultrasonic Spray-Pyrolysis Route and their Surface Properties

Abstract:

Boron-containing hydroxyapatite (BAp) powders with Ca/(P+B) molar ratio of 1.67 (x=0.4, 0.5, and 0.6) were prepared by an ultrasonic spray-pyrolysis (USSP) technique. The resulting BAp powders were uniaxially compressed to fabricate the green compacts. The BAp ceramics were fabricated by firing the compacts at 1200 °C for 5 h. The crystalline phases of the BAp (x=0.4) ceramics were bipahses of apatite and small amounts of α-tricalcium phosphate (a-Ca₃(PO₄)₂; α-TCP). Meanwhile, HAp and BAp (x=0.5 and 0.6) ceramics were apatite single phase. The dense BAp ceramics with relative density of 90% over were fabricated from the powder of x=0.5 and 0.6. The static contact angles of the BAp ceramics (x=0.5 and 0.6) increased with an increase of pH; meanwhile, the surface potential decreased with an increase of pH. These changes in surface properties may be due to the increase of OH group in B(OH)₃ formed via dissociation of BO₂ group in BAp.

• Periodical: Key Engineering Materials (Volumes 529-530)
• Pages: 109-113
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.529-530.109
• Online since: November 2012
• Authors: Mariko Nakamura, Zhi Zhuang, Mamoru Aizawa
• Keywords: Apatite Microsphere, Boron-Containing Apatite, Ultrasonic Spray-Pyrolysis

References

[1] M. Nakamura, W. Hiraoka and M. Aizawa, 9th Word Biomaterials Congress (9th WBC), Chengdu, China 1st-5th, June (2012), 111-2747.

[2] H. Miyazaki, T. ikeya, K. Kataoka, T. Okano and Y. Sakurai, Int. J. Artif. Organs, 23, 978-981 (1994).

[3] A. Ito, H. Aoki, M. Akao, Na. Miura, R. Otsuka and S. Tsutsumi, J. Ceram. Soc. Jpn., 96, 707-09.

[4] M. Aizawa, K. Itatani, and I. Okada, Phosphorus Res. Bull., 20, 61-78(2006).