title: Effect of Ca/P ratio and milling material on the mechanochemical preparation of hydroxyapaptite.
abstract: The mechanochemical transformation of Ca(OH)(2)-(NH(4))(2)HPO(4) with different Ca/P ratios 1; 1.5; 1.67 and 1.75 was carried out for different periods of time from 10 min to 24 h in a horizontal vibration mill using steel and agate vials and balls. The phase transformations obtained at each milling stage were characterized by X-ray diffraction, infrared spectroscopy and transmission electron microscopy. Complete transformation to hydroxyapatite took place during the first 5 h of milling, for Ca/P ratios 1.5 to 1.7, when milling was carried out with steel vials and balls. The contamination was not significant for the periods of milling studied for both milling media.
authors: Centro de Química, Instituto Venezolano de Investigaciones Científicas, IVIC, Apdo. Postal 21827, Caracas 1020, Venezuela. jsalas@ivic.ve
authors: Janeth
authors: J
authors: Salas
authors: Zully
authors: Z
authors: Benzo
authors: Gema
authors: G
authors: Gonzalez
authors: Eunice
authors: E
authors: Marcano
authors: Clara
authors: C
authors: Gómez
mesh_terms: D000268:Adhesiveness; D001842:Bone and Bones / Q000473:pathology; D002130:Calcium Phosphates / Q000737:chemistry*; D002516:Ceramics; D003460:Crystallization; D017886:Durapatite / Q000737:chemistry*; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles; D009985:Orthopedics / Q000379:methods; D011208:Powders; D011312:Pressure; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates; D011208:Powders; C485817:beta-tricalcium phosphate; D017886:Durapatite; C020243:calcium phosphate