Biomedical Engineering Reference
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straightness, diameter and aspect ratio. The selection of SWCNTs,
DWCNTs or MWCNTs for reinforcement in glass/glass-ceramic matrices
may have a strong influence on phenomenology, particularly on toughening
mechanisms. The lateral flexibility of CNTs and their high axial stiffness are
contrasting characteristics. It remains to be seen whether thin flexible
SWNTs or stiff, straight MWNTs are most effective; most likely this
diameter range will span a transition from conventional fiber theory to new
mechanisms requiring new understanding. The development of in-situ CNT
composite synthesis methods is another area for further research; in-situ
CNT processing could lead to defect-free CNTs without catalysts and
carbon by-products and without affecting the surface properties of CNTs.
A useful increase in functional properties, moderate increase in
mechanical characteristics and improved technological properties suggest
the potential use of CNT-glass/glass-ceramic matrix composites in
numerous industrial sectors. Although the extent of improvement in these
composites (especially fracture toughness) is not as significant as that
obtained with continuous/chopped carbon fiber reinforced glass/glass-
ceramic matrix composites, the possibility of tailoring the functional
properties and the simplicity of production (in comparison with continuous
fiber reinforced composites) justifies continued R&D efforts in this field.
Combinations of CNT fillers with conventional fiber reinforcements may
prove particularly beneficial in the near term, as has begun to be
demonstrated in polymer matrix systems (Qian et al., 2010).
7.9 References
Ahmad, I., Kennedy, A. and Zhu, Y. Q. 2010. Wear resistant properties of multi-
walled carbon nanotubes reinforced Al 2 O 3 nanocomposites. Wear, 269, 71-78.
Ajayan, P. M., Redlich, P. and Ruhle, M. 1997. Balance of graphite deposition and
multishell carbon nanotube growth in the carbon arc discharge. Journal of
Materials Research, 12, 244-252.
An, J. W., You, D. H. and Lim, D. S. 2003. Tribological properties of hot-pressed
alumina-CNT composites. Wear, 255, 677-681.
Arnold, M., Boccaccini, A. R. and Ondracek, G. 1996. Theoretical and experimental
considerations on the thermal shock resistance of sintered glasses and ceramics
using modelled microstructure-property correlations. Journal of Materials
Science, 31, 463-469.
Arvanitelis, C., Jayaseelan, D. D., Cho, J. and Boccaccini, A. R. 2008. Carbon
nanotube-SiO2 composites by colloidal processing. Advances
￿ ￿ ￿ ￿ ￿ ￿
in Applied
Ceramics, 107, 155-158.
Aveston, J. 1971. Strength and toughness in fiber reinforced ceramics. In: Conference
on Properties of Fiber Composites, 1971. IPC Science and Technology Press.
Babooram, K. and Narain, R. 2009. Fabrication of SWNT/silica composites by the
sol-gel process. ACS Applied Materials & Interfaces, 1, 181-186.
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