Carbon nanotube-based bioceramic grafts for electrotherapy of bone
authors Mata, D; Horovistiz, AL; Branco, I; Ferro, M; Ferreira, NM; Belmonte, M; Lopes, MA; Silva, RF; Oliveira, FJ
nationality International
journal MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
author keywords Carbon nanotubes; Bone grafts; Stimuli-responsive materials; Electrotherapy of bone
keywords GLASS-REINFORCED-HYDROXYAPATITE; CORTICAL BONE; COMPOSITES; DEPENDENCE; NANOCOMPOSITES; OSTEOBLASTS; PERCOLATION; POROSITY; GROWTH; MWCNT
abstract Bone complexity demands the engineering of new scaffolding solutions for its reconstructive surgery. Emerging bone grafts should offer not only mechanical support but also functional properties to explore innovative bone therapies. Following this, ceramic bone grafts of Glass/hydroxyapatite (HA) reinforced with conductive carbon nanotubes (CNTs) - CNT/Glass/HA - were prepared for bone electrotherapy purposes. Computer-aided 3D microstructural reconstructions and TEM analysis of CNT/Glass/HA composites provided details on the CNT 3D network and further correlation to their functional properties. CNTs are arranged as sub-micrometric sized ropes bridging homogenously distributed ellipsoid-shaped agglomerates. This arrangement yielded composites with a percolation threshold of p(c) = 1.5 vol.%. At 4.4 vol.% of CNTs, thermal and electrical conductivities of 1.5 W.m(-1).K-1 and 55 S.m(-1), respectively, were obtained, matching relevant requisites in electrical stimulation protocols. While the former avoids bone damaging from Joule's heat generation, the latter might allow the confinement of external electrical fields through the conductive material if used for in vivo electrical stimulation. Moreover, the electrically conductive bone grafts have better mechanical properties than those of the natural cortical bone. Overall, these highly conductive materials with controlled size CNT agglomerates might accelerate bone bonding and maximize the delivery of electrical stimulation during electrotherapy practices. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0928-4931
year published 2014
volume 34
beginning page 360
ending page 368
digital object identifier (doi) 10.1016/j.msec.2013.09.028
web of science category Materials Science, Biomaterials
subject category Materials Science
unique article identifier WOS:000330489500045
link 24268270

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