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Title: | Self-assembled ordering of single-walled carbon nanotubes in a lyotropic liquid crystal system |
Authors: | Vijayaraghavan, D. |
Keywords: | Lyotropic liquid crystal Carbon nanotube Self-assembly SAXS Birefringence |
Issue Date: | Nov-2014 |
Publisher: | Elsevier B.V |
Citation: | Journal of Molecular Liquids, 2014, Vol.199, p 128-132 |
Abstract: | We have carried out small angle X-ray scattering (SAXS) studies as a function of temperature on 0.01 wt.% single-walled carbon nanotubes (SWCNTs) dispersed lyotropic liquid crystal (LLC) system consisting of 25 wt.% cetyltrimethylammonium bromide (CTAB) in water. This LLC system exhibits crystalline surfactant + water (Cr), nematic (N), hexagonal (H) and isotropic (I) phases on heating. Our SAXS pattern revealed that in the crystalline + water phase of the LLC, the doped CNTs exhibit 1-D ordering. In the nematic and hexagonal phases of the LLC, the CNTs exhibit 2-D hexagonal ordering. In the isotropic phase, there are domains of CNTs and within each domain, the nanotubes exhibit 1-D ordering. A plot of d-spacing of the CNTs as a function of temperature showed peaks at the phase transition temperatures of the LLC. We have also carried out optical birefringence and electrical conductivity measurements of the composite as a function of temperature. Interestingly, they also showed peaks at the phase transition temperatures. This indicates a correlation between the d-spacing of the CNTs and the anomalous increase in the birefringence and conductivity of the composite at the phase transition temperatures. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/6000 |
ISSN: | 0167-7322 |
Alternative Location: | http://dx.doi.org/10.1016/j.molliq.2014.08.022 |
Copyright: | 2014 Elsevier B.V. |
Appears in Collections: | Research Papers (SCM) |
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