论文部分内容阅读
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.
Nanosized particles of hydroxyapatite (HAP) were synthesized by reacting Ca (H_2PO_4) _2 · H_2O solution 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 2 O] / [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 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 (H2PO4) _2 · H_2O microemulsion lineally depended on w. Size of final HAP particles was greatly affected by water content w and rea ctant concentration. Increasing water content w from 3 to 9, the size of HAP particles increased from 10-20 nm to 40-50 nm at reactant concentration [Ca (H 2 PO 4) 2 .H 2 O] = 12 × 10 -3 mol /dm~3. The resulting HAP particles were poorly crystallized and spherical in morphology.