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Micrographs of Ca-phosphate nanoparticles (Ca-phosphate-NP) and of Ca-polyP microparticles (Ca-polyP-MP); (A,B) optical microscopy; (C–F) Scanning electron microscopy (SEM) (A,C,D) The Ca-phosphate-NP appear as homogeneous material and as spherical particles of a size around 35 nm at high magnification; (B,E,F) The Ca-polyP-MP particles are a likewise homogenous powder at lower magnification and spherical particles at high power scanning electron microscopy (SEM).
