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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/).
SEM micrographs of different hierarchical structures resulting from freezing samples with different CS/CaP ratios. CSCaP1 (upper line), CSCaP2 (middle line) and CSCaP3 (bottom line). From left to right, bars are 200, 50 and 20 µm, respectively.