Reference : Spontaneous macroscopic carbon nanotube alignment via colloidal suspension in hexagon...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Spontaneous macroscopic carbon nanotube alignment via colloidal suspension in hexagonal columnar lyotropic liquid crystals
Scalia, Giusy [> >]
von Bühler, Clemens [> >]
Hägele, Constanze [> >]
Roth, Siegmar [> >]
Giesselmann, Frank [> >]
Lagerwall, Jan mailto [Martin-Luther-Universität Halle-Wittenberg]
Soft Matter
Royal Society of Chemistry
Yes (verified by ORBilu)
United Kingdom
[en] carbon nanotubes ; lyotropic liquid crystal ; alignment ; colloidal dispersion
[en] The self-assembly of amphiphilic molecules in aqueous solution into lyotropic liquid crystals (LCs), characterised by soft yet long-range ordered nanoscale structures, constitutes a fascinating phenomenon at the heart of soft matter science which can be employed in a manifold of creative ways. Particularly interesting structures may arise as a result of functionalisation of the LC with appropriate guest molecules, adopting the order of their host. Here we combine cat- and anionic surfactants to form a liquid-crystalline colloidal suspension of carbon nanotubes (CNTs), which by virtue of the spontaneously formed hexagonal columnar LC structure are uniaxially aligned over macroscopic areas. The nanotube concentration can be so high, with sufficiently uniform alignment, that the mixture becomes a fluid linear polariser, the anisotropic optical properties of CNTs having been transferred to macroscopic scale by the LC. Moreover, thin and highly aligned filaments can be drawn and deposited in selected directions on arbitrary surfaces, after which the LC template can be rinsed away. Combined with recently developed methods for CNT fractionation according to chirality, the technique would yield an unprecedented degree of control in the practical realisation of carbon nanotube-based devices and materials.
Researchers ; Professionals
Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.   ENEA CR Portici, I-80055 Portici, NA, Italy.   Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany. Lagerwall, JPF, Univ Halle Wittenberg, Fac Chem Phys, Inst Chem Phys   Chem, Muehlpforte 1, D-06108 Halle, Germany.

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