アルギン酸ナトリウムを用いた繊維状水酸アパタイトの合成(<小特集>セラミック材料小特集)

概要

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In this paper, fibrous hydroxyapatite (HAp), which is expected to be used as an implant material to periodontal bone defects, was prepared by using sodium alginate (Na-Alg.). The starting materials were prepared by dissolving Na_4P_2O_7 into 5% Na-Alg. solution: Na-Alg. /Na_4P_2O_7 (weight ratio) = 2.4, 2.6, 2.8, 3.0, 3.2, while the mixed solution of 0.15 mol Ca(CH_3COO)_2 and 0.1 mol CaCl_2 was used as the spinning solution; pH=6.0, 6.5, 7.0, 7.5. The starting materials were spun through a nozzle of 0.1^φ mm into the spinning solution in a vessel of 16 ml capacity. Gelatinous fibers obtained were aged, dried and calcined at 900℃ for 1 hour. The thermal transformation of the calcined fibers and their compositions were examined by using X-ray diffraction, DTA, and chemical analysis. From these results, the optimum condition for preparing fibrous HAp was found to be as follows; Na-Alg. /Na_4P_2O_7=3.0, pH=6.5. In order to remove pores appearing during the heating process, the dried fibers formed under the optimum condition were heat-treated under reduced pressure (at 133 Pa and 900℃ for 3 hours). The resulting HAp fibers were about 30-40 μm in diameter. It was also confirmed that the HAp phase in the fibers was maintained even after heat-treated at 1300℃ for 1 hour in air.
社団法人日本材料学会の論文
1988-01-15