Carbon nanotube-based bioceramic grafts for electrotherapy of bone
| Autor: | I. Branco, Manuel Belmonte, Maria A. Lopes, A.L. Horovistiz, Marta C. Ferro, Nuno M. F. Ferreira, Rui F. Silva, Filipe J. Oliveira, D. Mata |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Ceramics
PERCOLATION Materials science CORTICAL BONE Biocompatible Materials Electric Stimulation Therapy Bioengineering Bioceramic Carbon nanotube law.invention Biomaterials X-Ray Diffraction DEPENDENCE OSTEOBLASTS law COMPOSITES medicine Humans Ceramic Composite material Electrical conductor Bone Transplantation Nanotubes Carbon MWCNT Electric Conductivity GLASS-REINFORCED-HYDROXYAPATITE POROSITY Thermal Conductivity Percolation threshold NANOCOMPOSITES Durapatite medicine.anatomical_structure Mechanics of Materials Agglomerate visual_art Heat generation visual_art.visual_art_medium GROWTH Cortical bone Glass |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 0928-4931 |
| DOI: | 10.1016/j.msec.2013.09.028 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect