Journal
COMPOSITES PART B-ENGINEERING
Volume 40, Issue 3, Pages 212-217Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2008.11.003
Keywords
Nano-structures; Mechanical properties; Micromechanics
Funding
- Air Force Research Laboratory
- NSF IUCRC Program
- Florida State University Cornerstone Research Program
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The potential capability of improving overall elastic modulus of nanotube-reinforced composites is a fundamental concern in nanotechnology applications. Based on geometric analysis and micromechanics estimation, this study reports that the ratio of surface-to-surface distance of adjacent carbon nanotubes (CNTs) to the CNT diameter plays a key role in improving the overall elastic modulus of the CNT-reinforced composites when the tubes are perfectly aligned, completely separated from other tubes, and ideally bonded with the composite matrix. With the decrease of this ratio, that is, decrease of the surface-to-surface distance of adjacent CNTs and/or increase CNT diameter, the improvement capability increases. However, theoretical and experimental results show that an increase of the CNT diameters degrades the elastic moduli of CNTs. This paper discusses the criterion of choosing CNTs with larger diameter and addresses the factors influencing the surface-to-surface distance of adjacent CNTs. (C) 2009 Elsevier Ltd. All rights reserved.
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