Reference : Filament formation in carbon nanotube-doped lyotropic liquid crystals
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/20506
Filament formation in carbon nanotube-doped lyotropic liquid crystals
English
Schymura, Stefan [> >]
Dölle, Sarah [> >]
Yamamoto, Jun [> >]
Lagerwall, Jan mailto [Martin-Luther-Universität Halle-Wittenberg > > > ; Seoul National University]
2011
Soft Matter
Royal Society of Chemistry
7
6
2663 - 2667
Yes (verified by ORBilu)
International
1744-683X
1744-6848
Cambridge
United Kingdom
[en] carbon nanotube ; lyotropic liquid crystal ; percolation
[en] By introducing carbon nanotubes (CNTs) into lyotropic nematic liquid crystals, strongly enhanced viscoelastic behaviour results, allowing the extraction of very thin and long filaments in which the CNTs are uniformly aligned. The filament formation requires the liquid crystallinity of the host phase and it does not take place for coarsely dispersed nanotubes or if their concentration is below a threshold value. The type of nanotube plays only a small role, single- as well as multiwall CNTs both trigger the filament formation, but spherical C60 fullerenes do not give rise to the phenomenon. We argue that individualized CNTs stiffen the rod-shaped micelles of the liquid crystal host and that the elongational flow then increases the nematic long-range order as well as the micelle length. If the CNTs are present at a sufficient concentration to connect in continuous linear chains of arbitrary extension, the micelle stiffening is ensured regardless of length, taking the system into a positive feedback loop between increasing orientational order and diverging micelle length. It is this percolation-like transition to aligned and quasi-infinite micelles stabilized by chains of nanotubes that makes the filament formation possible.
Researchers
http://hdl.handle.net/10993/20506
10.1039/c0sm01225d

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