Abstract Hydroxyapatite is a calcium phospHAte tHAt is similar in morphology and composition to human HArd tissues. One of the important features of hydroxyapatite is its stability compared to other calcium phospHAtes. Thermodynamically, hydroxyapatite is the most stable calcium phospHAte compound under physiological conditions such as temperature, pH, and composition of body fluids. Nano hydroxyapatite HAs been considered as a biological material for use in body imPLAnts due to its similarity in size, crystallography and chemical composition with human HArd tissue. The purpose of this research is to process HA:Eu 3+ ceramics by combustion synthesis method and to investigate the optical properties of these materials and to produce PLA/HA composite for biomaterial applications. Hydroxyapatite nanoparticles were prepared by combustion synthesis method using calcium nitrate, ammonium phospHAte, urea and nitric acid raw materials. The effect of calcination time and temperature on the pHAse composition and the effect of improved properties by doping with europium oxide and the results of composites of this ceramic with polylactic acid were measured. X-ray diffraction (XRD) technique was investigated in order to confirm the presence of desired pHAses in the synthesized composition. Hydroxyapatite nano powder obtained from synthesis with polylactic acid was produced as a composite in different percentages. FESEM analysis, which is a member of the scanning electron microscope family, was used to investigate the surface cHAracteristics and morphology of different samples. Finally, different samples were used to eva‎luate biocompatibility properties and compare it with biological hydroxyapatite powder, in a body simulating solution (SBF) for twenty And he was submerged for eight days. Checking the pH of the solution and inductively coupled PLAsma (ICP) spectroscopy, which is used to detect and measure elements in the analysis of samples, were other analyzes of the project. The results of the investigations showed tHAt hydroxyapatite with dimensions of 64 to 85 nm was produced and the particles were spherical in sHApe. In order to check the bioactivity properties, the composites were PLAced in SBF solution for twenty eight days. The amount of calcium and phosphorus was measured every four weeks, the sample of 10% hydroxyapatite by melting method in the third week HAs the highest amount of calcium and pure polylactic acid in the third week HAs the lowest amount of calcium and the sample of 10% by dissolution method in the fourth week HAs the lowest amount of phosphorus. HAd the The test of the mecHAnical properties of the composites prepared with different percentages showed tHAt the 10% composite sample is the optimal sample and HAs the highest tensile strength.

مهدي رفيعائي