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From the same paper as the previous 3 images.
Figure 7. (a) Cross-sectional views of (a) elliptic (n = 2); and (b) corrugated (n = 5) deformation modes; The mode index n indicates the wave number of the deformation mode along the circumference; (c) Wall-number dependence of critical pressure pc. Immediately above pc, the original circular cross section of MWNTs gets radially corrugated; (d) Stepwise increase in the corrugation mode index n. Reprinted from References [53,61]:
53. Shima, H.; Sato, M. Multiple radial corrugations in multiwall carbon nanotubes under pressure. Nanotechnology 2008, 19, 495705.
61. Shima, H.; Ghosh, S.; Arroyo, M.; Iiboshi, K.; Sato, M. Thin-shell theory based analysis of radially pressurized multiwall carbon nanotubes. Comput. Mater. Sci. 2012, 52, 90–94.
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