Fig. 3From: Organic Phosphorous and Calcium Source Induce the Synthesis of Yolk-Shell Structured Microspheres of Calcium Phosphate with High-Specific Surface Area: Application in HEL AdsorptionSEM and TEM images of ATP-CG microspheres synthesized with various of Ca/P. a, b Ca/P = 0.8. c, d Ca/P = 1.67. e, f Ca/P = 2.5. g, h Ca/P = 3.3. i HRTEM, j EDS-mapping, k EDS spectra, l XPS spectra of ATP-CG microspheres with Ca/P = 3.3Back to article page