Nanosized particles of hydroxyapatite (HAP) were synthesized by reacting Ca(H_2PO_4)_2·H_2O solution complex with equimolar Ca(OH)_2 saturated solution in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane w...Nanosized particles of hydroxyapatite (HAP) were synthesized by reacting Ca(H_2PO_4)_2·H_2O solution complex with equimolar Ca(OH)_2 saturated solution in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane water-in-oil microemulsion.The formation of microemulsion strongly depended on water content w (w=[H_2O]/[AOT] molar ratio) and concentration of surfactant and cosurfactant (1-octanol).By the variety of conductivity with w and the partial ternary phase diagram derived from a series of demarcation points,we set the basic component of microemulsions:[AOT]=0.1M(mol/dm^3),[1-octanol]=0.1M and w=3-9.Dynamic light scattering (DLS),UV-visible absorbance,TEM analysis and X-ray diffraction were used to characterize the microemulsion,formation of particles and resulting HAP particles.At low water content(w<9),the water pool radius of the droplet in the Ca(H_2PO_4)_2·H_2O microemulsion lineally depended on w.The size of final HAP particles was strongly affected by water content w and reactant concentration.With increasing water content w from 3 to 9,the size of HAP particles increased from 10-20nm to 40-50 nm at reactant concentration [Ca(H_2PO_4)2·H_2O]=12×10^(-3) mol/dm^3.The resulting HAP particles were poorly crystallized and spherical in morphology.展开更多
文摘Nanosized particles of hydroxyapatite (HAP) were synthesized by reacting Ca(H_2PO_4)_2·H_2O solution complex with equimolar Ca(OH)_2 saturated solution in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/isooctane water-in-oil microemulsion.The formation of microemulsion strongly depended on water content w (w=[H_2O]/[AOT] molar ratio) and concentration of surfactant and cosurfactant (1-octanol).By the variety of conductivity with w and the partial ternary phase diagram derived from a series of demarcation points,we set the basic component of microemulsions:[AOT]=0.1M(mol/dm^3),[1-octanol]=0.1M and w=3-9.Dynamic light scattering (DLS),UV-visible absorbance,TEM analysis and X-ray diffraction were used to characterize the microemulsion,formation of particles and resulting HAP particles.At low water content(w<9),the water pool radius of the droplet in the Ca(H_2PO_4)_2·H_2O microemulsion lineally depended on w.The size of final HAP particles was strongly affected by water content w and reactant concentration.With increasing water content w from 3 to 9,the size of HAP particles increased from 10-20nm to 40-50 nm at reactant concentration [Ca(H_2PO_4)2·H_2O]=12×10^(-3) mol/dm^3.The resulting HAP particles were poorly crystallized and spherical in morphology.
