Conversion of hydroxyapatite contained in fish scales to needle-like crystals

摘要

Hydroxyapatite (HAp) contained in fish scales was dissolved in citric acid solution and needle4ike HAp crystals were synthesized hydrothermally. In this case, heating for a period of more than 4 hours at 200°C was necessary to obtain the needle4ike crystals. Size of the crystals was 1.6-3.1μm long, 0.07-0.2μm thickness and 10-41 aspect ratio. These crystals gathered mutually and formed fan-shaped lump.