7 research outputs found
Thin-shell theory based analysis of radially pressurized multiwall carbon nanotubes
The radial deformation of multiwall carbon nanotubes (MWNTs) under hydrostatic pressure is investi gated within the continuum elastic approximation. A thin shell theory, with accurate elastic constants and interwall couplings, allows us to estimate the critical pressure above which the original circular cross section transforms into radially corrugated ones. The emphasis is placed on the rigorous formula tion of the van der Waals interaction between adjacent walls, which we analyze using two different approaches. Possible consequences of the radial corrugation in the physical properties of pressurized MWNTs are also discussed
Core-tube morphology of multiwall carbon nanotubes
The present paper investigates the cross-sectional morphology of Multiwalled
Carbon Nanotubes (MWNTs) restrained radially and circumferentially by an
infinite surrounding elastic medium, subjected to uniform external hydrostatic
pressure. In this study, a two-dimensional plane strain model is developed,
assuming no variation of load and deformation along the tube axis. We find some
characteristic cross-sectional shapes from the elastic buckling analysis. The
effect of the surrounded elastic medium on the cross-sectional shape which
occurs due to pressure buckling is focused on by the comparison with the shape
for no elastic medium case in our discussion. It is suggested that in no
embedded elastic medium cases, the cross-sectional shapes of inner tubes
maintain circle or oval; on the other hand, an embedded medium may cause inner
tube corrugation modes especially when the number of shells for MWNTs is small.Comment: 7 figures, 2 figure
Diverse corrugation pattern in radially shrinking carbon nanotubes
Stable cross sections of multiwalled carbon nanotubes subjected to electron-beam irradiation are investigated in the realm of the continuum mechanics approximation. The self-healing nature of sp2 graphitic sheets implies that selective irradiation of the outermost walls causes their radial shrinkage with the remaining inner walls undamaged. The shrinking walls exert high pressure on the interior part of nanotubes, yielding a wide variety of radial-corrugation patterns (i.e. circumferentially wrinkling structures) in the cross section. All corrugation patterns can be classified into two deformation phases for which the corrugation amplitudes of the innermost wall differ significantly
Diverse corrugation pattern in radially shrinking carbon nanotubes
Stable cross-sections of multi-walled carbon nanotubes subjected to
electron-beam irradiation are investigated in the realm of the continuum
mechanics approximation. The self-healing nature of sp graphitic sheets
implies that selective irradiation of the outermost walls causes their radial
shrinkage with the remaining inner walls undamaged. The shrinking walls exert
high pressure on the interior part of nanotubes, yielding a wide variety of
radial corrugation patterns ({\it i.e.,} circumferentially wrinkling
structures) in the cross section. All corrugation patterns can be classified
into two deformation phases for which the corrugation amplitudes of the
innermost wall differ significantly.Comment: 8 pages, 4 figure
Diverse corrugation pattern in radially shrinking carbon nanotubes
Stable cross sections of multiwalled carbon nanotubes subjected to electron-beam irradiation are investigated in the realm of the continuum mechanics approximation. The self-healing nature of sp2 graphitic sheets implies that selective irradiation of the outermost walls causes their radial shrinkage with the remaining inner walls
undamaged. The shrinking walls exert high pressure on the interior part of nanotubes, yielding a wide variety of radial-corrugation patterns (i.e. circumferentially wrinkling structures) in the cross section. All corrugation patterns can be classified into two deformation phases for which the corrugation amplitudes of the innermost
wall differ significantly.Peer Reviewe