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. 2015 Jan 20;5(1):90–114. doi: 10.3390/nano5010090

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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Structural features of (a) Monolithic Al₂O₃ showing large grains with inter-granular fracture; (b) CNTs/Al₂O₃ nanocomposites with fine grains; (c) Trans-granular fracture mode in CNTs/Al₂O₃ nanocomposites; and (d) Single-walled (SW)CNTs at grain boundary of Al₂O₃ matrix. TEM images exhibiting the CNT–ceramic interactions (e) Multi-walled (MW)CNTs (black arrow) showing their morphology in nanocomposite; (f) A single MWCNT existing at grain boundary; (g) in porosity and (h) Embedded within a single ceramic grain. Adapted from References [32] and [66] with permissions. Copyright 2010, Elsevier Ltd.