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We synthesized hydroxyapatite (HAp) by the sol-gel method based on reaction of phosphoric acid and the calcium acetate obtained by dissolving scallop shells in acetic acid. The synthesized HAp was the crystal that is flat and elliptical shape (50–100 nm). On the other hand, HAp from the commercial calcium acetate is large crystal of irregular shape. Mg2+, K+ and Na+ ions were contained in HAp from scallop shell. Effective utilization of waste scallop shell as a high value-added product such as adsorbent or artificial biomaterial can be expected.

Shape Specificity of Crystal of Hydroxyapatite Synthesized by Sol-Gel Method from Scallop Shell