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. 2016 May 19;17(5):713. doi: 10.3390/ijms17050713

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Field Emission Scanning Electron Microscope (FESEM) micrograph showing the pore structure of the micron-size cockle shells calcium carbonate powder, scale bar = 1 µm (a); and Transmission Electron Microscopy (TEM) micrographs showing nanoscale spherical-shaped cockle shells calcium carbonate (aragonite) nanoparticles (b).