材料結(jié)構(gòu)及其性能(英文版)-全文預(yù)覽
【正文】 in the arrangement of the carbon atoms in hexagonal arrays on their surface honeyb lattices. The helicity (local symmetry), along with the diameter (which determines the size of the repeating structural unit) introduces significant changes in the electronic density of states, and hence provides a unique electronic character for the nanotubes.CNTssuperior mechanical propertieslowmassdensityhighelectronmobilitylarge currentcarrying capabilityhigh thermal conductivitylarge aspect ratioWet SpinningAn aqueous suspension of carbon nanotubes, stabilized by a surfactant, is injected into a flowing solution of polyvinyl alcohol which causes the fiber to coagulate. It is then removed from the bath and washed to remove excess polymer. Organization into FibersDry SpinningDry spinning from carbon nanotube forests. (a) A typical “forest” of multiwall carbon nanotubes grown from a substrate. (b) Photograph of the spinning of a carbon nanotube fiber from a forest of multiwall nanotubes.(a) Picture of a SWNTs forest. (b) SEM image of the SWNTs forest ledge. (c) HRTEM image of SWNTs. (d) A large area TEM image. (e) SEM image of SWNT cylindrical pi
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