The HA powder obtained was observed to have a white color with good flow properties. By adjusting to the required pH, temperature and reflux conditions, the conversion of calcium phosphate to hydroxyapatite took place. It is believed that nano structured calcium phosphate ceramics can improve the sintering kinetics due to the presence of large surface area and subsequently lead to significant improvement in mechanical properties. Journal of the American Ceramic Society. Influence of monosaccharides and related molecules on the morphology of hydroxyapatite.
The particles after calcination are not hollow, rather spherical shaped nano pores are observed, which are presumably formed due to evolution of gases during processing.
Journal of Materials Science.
A cationic surfactant is used as regulator of nucleation and crystal growth. The HA nano particles have a rod-shaped morphology with diameters of about 50 nm and lengths of nm. Advanced Materials. HA is processed into dense bodies by sintering and sintering temperature, stoichiometry, phase purity, particle grain size, And porosity are important processing parameters. Nature of deficiency in nonstoichiometric hydroxyapatites. The HA nano particles were composed of tiny crystals of about 5 nm size.
Thermal analysis on hydroxyapatite synthesis through mechanochemical method. The current research focuses on identification of mechanism of the formation of HA nano-crystals during its preparation when surfactant nano reactors are used for their nucleation and growth. Despite the success of HA derived implants one of the major drawbacks of this material is its poor tensile strength and fracture toughness compared to natural bone. In: German RM.
Sodium hydroxide NaOH was used to maintain pH of the solution at required levels.
Surfactant solution with a concentration of 0. In: German RM. Calcination of synthesized HA powders would then release the organic surfactant molecules presumably leaving pure, cylindrical shaped HA particles. Intermediate Stage Processes: Solution - Reprecipitation.
Nanosized particles made in colloidal assemblies. In powder form, the nano particles of HA are clustered into large agglomerates of irregular shapes. Adsorption of phosphate onto the micelle surfaces during the surface treatment of micelles occurs due to electrostatic force of attractions of the oppositely charged ions. The broad bands at cm—1 and cm—1 are related to the absorbed water and OH—1, respectively, while the weak peak at cm—1 corresponds to the stretching vibration of OH—1 ions in the HA lattice The size of these crystallites is between nm.
The instrument was operated at 40 kV with a current of 40 mA.