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Journal of Electron Microscopy 2008 57(5):159-164; doi:10.1093/jmicro/dfn016
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

High-resolution electron microscopy of multi-wall carbon nanotubes in the subcutaneous tissue of rats

Norihito Sakaguchi1,*, Fumio Watari2, Atsuro Yokoyama2 and Yoshinobu Nodasaka2

1 Center for Advanced Research of Energy Conversion Materials, Hokkaido University, Kita13, Nishi7, Kita-ku, Sapporo 060-8586, Japan
2 Graduate School of Dental Medicine, Hokkaido University, Kita13, Nishi7, Kita-ku, Sapporo 060-8586, Japan

* To whom correspondence should be addressed. E-mail: sakagu{at}ufml.caret.hokudai.ac.jp

The atomic structure of multi-wall carbon nanotubes (MWCNTs) implanted in the subcutaneous tissue of rats was examined by means of high-resolution transmission electron microscopy (HRTEM). Clusters of the MWCNTs implanted in the subcutaneous tissue were well recognized by the TEM observations. It was indicated that some nanotubes were taken in phagocytes after the 1-year implantation. The deterioration of crystalline structure of the nanotubes in phagocytes was shown by the HRTEM observation. It was suggested that the deterioration of the nanotubes was due to the peeling of the outer graphene layers in the phagocytes.

Keywords     carbon nanotube, in vivo, high-resolution electron microcopy, low-voltage and high-voltage transmission electron microscope

Received     18 August 2008, accepted 20 August 2008


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