首页|High resolution electron microscopy: a powerful tool to characterize nanotubes
High resolution electron microscopy: a powerful tool to characterize nanotubes
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Trans Tech Publications Ltd
HREM is a powerful tool for elucidating the local structure of solids, which is a crucial aspect for understanding their properties. The evolution of microcopy has been parallel to the new discoveries in material science prompted by the need of going deeper on the solid behaviour. Among the most recent discoveries CNTs (1) have supposed a great revolution on the carbon chemistry development and, in general, in materials chemistry due to their unique physical and chemical features. They are hollow nanostructures with high specific surface. Plan-view HREM images evidence the strong (0002) fringes with d spacing characteristic of graphite interlaminar distance. SWCNTs generally appear in form of bundles and can be easily observed either in plan or end views. The hollow interior makes possible the introduction of substances but it is also possible to functionalize their external and internal surface. These features have attracted an enormous interest for biomedical applications because of their intrinsic ability of transporting and delivery of fluids and molecular species as well as their use as nanoscale containers or building blocks. HREM imaging linked with processing techniques has been proved to be a successful tool to identify and characterize crystalline substances inside the tubes. In spite of the initial consideration of toxicity of CNT, it has been shown that the biocompatibility is determined by surface funcionalization rather than by size and shape (52, 53).
M. L. Ruiz-Gonzalez、J. M. Gonzalez-Calbet
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Departamento de Quimica Inorganica, Facultad de Quimicas, Universidad Complutense, 28040-Madrid, Spain
NETL
NSTL
Trans Tech Publications Ltd
