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Whisker-like hydroxyapatite(HAp) was synthesized by an aqueous ammonia neutralization method using nitrogen carrier. Acidic-aqueous solutions containing 0.167 mol•Edm-3 Ca(NO3)2 and 0.1 mol•E.dm-3 (NH4)2HPO4 were heated at three different temperatures (70•Ž, 75•Ž and 80•Ž) for 24h and then at 95•Ž for 24h; during this process the solutions were neutralized with nitrogen-carrier gases saturated with various concentrations of aqueous ammonia. The flow rate of nitrogen carrier was 0.1 dm3•Emin-1. The obtained whisker-like HAp had Ca/P ratios of 1.59 to 1.62, which were non-stoichiometric compositions. The products were whisker-like and/or tape-like and/or acicular crystals. In the above three conditions, the mean values of long-axis size distribution and aspect ratio of whisker-like HAp were 14.5ƒÊm and 14.2 at 70•Ž, 18.1ƒÊm and 19.3 at 75•Ž, and 12.9‚•m and 13.2 at 80•Ž, respectively.

SYNTHESIS OF WHISKER-LIKE HYDROXYAPATITE BY AQUEOUS AMMONIA NEUTRALIZATION USING NITROGEN CARRIER