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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Mater Sci Eng C Mater Biol Appl. 2014 Jan 10;37:210–222. doi: 10.1016/j.msec.2014.01.008

Fig. 1.

Fig. 1

Scanning electron micrographs of spherical and monodisperse HAP nanoparticles (a), forming compact microscopic blocks and capturing the adsorbed drug upon desiccation (b). (c) A transmission electron micrograph of a single nanoscopic particle of HAP with denoted defect-laden crystalline particle core and the largely amorphous, disorder surface atomic layers thereof. DCPA (d) and ACP (e) powders display similar nanoparticle size and shape characteristics.