Figure 7.

(A) SEM image of amorphous calcium phosphate particles synthesized by using CaCl₂∙2H₂O as the calcium source and ATP as both the phosphorous source and stabilizer by microwave-assisted hydrothermal method at 120 °C for 10 min. Reproduced with permission from [168]. Wiley Publishing Groups, 2013; (B) TEM images of calcium phosphate precipitates. Reproduced with permission from [177]. Bulletin of the Chemical Society of Japan, 2008; (C) TEM image of hollow calcium phosphate particles prepared using soybean lecithin, Na₂ATP and CaCl₂ by the microware-assisted hydrothermal method at 120 °C. Reproduced with permission from [171]. Royal Society of Chemistry, 2015; (D) TEM image of hollow calcium phosphate nanospheres. Reproduced with permission from [172]. Royal Society of Chemistry, 2012; (E) Transmission electron microscopy (TEM) image of calcium phosphate nanoshells synthesized with templates of DOPA. Reproduced with permission from [173]. Elsevier, 2012; (F) TEM image of calcium phosphate spheres. Reproduced with permission from [176]. IOPscience, 2009.