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Preparation of Nanohydroxyapatite by a Sol–Gel Method Using Alginic Acid as a Complexing Agent
Author(s) -
Velu Geetha,
Gopal Buvaneswari
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03221.x
Subject(s) - alginic acid , sol gel , calcium nitrate , chelation , materials science , thermal treatment , phase (matter) , nanoparticle , particle size , chemical engineering , calcium , nuclear chemistry , chemistry , inorganic chemistry , nanotechnology , organic chemistry , biochemistry , engineering , composite material , metallurgy
Single‐phase calcium hydroxyapatite (HAP) was synthesized by a sol–gel route using calcium nitrate solution and ammonium dihydrogen phosphate solution as Ca and P sources and alginic acid as a chelating agent. The dried gel was heat‐treated at different temperatures in the range of 110°–900°C. Structural evolution from sol to gel and from the gel to HAP was studied by the powder X‐ray diffraction method, Infrared spectroscopy, and thermal analyses. The formation temperature of HAP was confirmed to be ∼300°C. Examination of the product obtained at 300°C under TEM suggested the development of hexagonal‐shaped nanoparticles, with the average particle size in the range of 50–100 nm.