Rings of single-walled carbon nanotubes. Martel, R., Shea, H. R., & Avouris, P. Nature, 398(6725):299–299, March, 1999.
Rings of single-walled carbon nanotubes [link]Paper  doi  abstract   bibtex   
Among the most studied processes of self-organization, are the coiling and ring formation of biopolymers such as DNA and proteins. These processes are complex, involving several different types of interaction. We have found that single-walled carbon nanotubes (SWNTs), which are renowned for their extremely high flexural rigidity, , can also be induced to organize themselves into rings or coils, with high yields of up to 50%. But unlike coils of biopolymers, in which hydrogen bonding and ionic interactions are usually involved, coils of nanotubes can be stabilized by van der Waals forces alone.
@article{martel_rings_1999,
	title = {Rings of single-walled carbon nanotubes},
	volume = {398},
	copyright = {© 1999 Nature Publishing Group},
	issn = {0028-0836},
	url = {http://www.nature.com/nature/journal/v398/n6725/abs/398299a0.html},
	doi = {10.1038/18589},
	abstract = {Among the most studied processes of self-organization, are the coiling and ring formation of biopolymers such as DNA and proteins. These processes are complex, involving several different types of interaction. We have found that single-walled carbon nanotubes (SWNTs), which are renowned for their extremely high flexural rigidity, , can also be induced to organize themselves into rings or coils, with high yields of up to 50\%. But unlike coils of biopolymers, in which hydrogen bonding and ionic interactions are usually involved, coils of nanotubes can be stabilized by van der Waals forces alone.},
	language = {en},
	number = {6725},
	urldate = {2014-03-25},
	journal = {Nature},
	author = {Martel, Richard and Shea, Herbert R. and Avouris, Phaedon},
	month = mar,
	year = {1999},
	pages = {299--299},
}

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