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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 (https://creativecommons.org/licenses/by/4.0/).
SEM images of the composite fibres: (a) PCL-10-CP-Ce-8 and (b) PCL-15-CP-Ce-8. First column represents SEM images based on backscattered electrons; the second and third columns represent SEM images based on secondary electrons, at different magnifications.