![]() ![]() The Landau-de Gennes theory is used to calculate the order parameter changes in the medium. ![]() It is surprising that sp3 bonded carbon was found to exist not only as cubic crystals but also as hexagonal crystals 20. Also, the numerical density definition is renewed in the presence of nanotubes. It is shown that in the nematic phase the flexoelectric coefficients increase along with the increase of the coupling strength and temperature. The enhancement in flexoelectric coefficients is more significant in hard anchoring conditions than in the weak anchoring case. The flexoelectric coefficients increase up to 5-fold is calculated near the phase transition temperature, which is in good accordance with the experimental reported data. Li, Nanoscience with Liquid Crystals (Springer International PU, 2016) Yang, Fundamentals of Liquid Crystal Devices (John Wiley & Sons, 2014) Sprokel, The Physics and Chemistry of Liquid Crystal Devices (Springer Science & Business Media, 2013)ĭ.K. Kralj, Liquid Crystal-Anisotropic Nanoparticles Mixtures, edited by J.M. Marulanda, Electronic Properties of Carbon Nanotubes (InTech Press, 2011) pp. Prost, The Physics of Liquid Crystals (Oxford University Press, 1993)Įdwards, The Theory of Polymer Dynamics (Oxford University Press, 1988) Flory, Principles of Polymer Chemistry (Cornell University Press, 1953) Éber (Editors), Flexoelectricity in Liquid Crystals: Theory, Experiments and Applications (Imperial College Press, 2012) Dettlaff-Weglikowska, in Proceedings of 16 ISCMP: Progress in Solid State and Molecular Electronics, Ionics and Photonics, 2010, J. ![]() Cryst.Liquid phase assembly is among the most industrially attractive routes for scalable carbon nanotube (CNT) processing. Chlorosulfonic acid (CSA) is known to be an ideal solvent for CNTs, spontaneously dissolving them without compromising their properties. At typical processing concentrations, CNTs form liquid crystals in CSA however, the morphology of these phases and their concentration dependence are only qualitatively understood. Here, we use small-angle neutron scattering (SANS), combined with polarized light microscopy and cryogenic transmission electron microscopy to study solution morphology over a range of concentrations and two different CNT lengths. Our results show that at the highest concentration studied the long CNTs form a highly ordered fully nematic phase, while short CNTs remain in a biphasic regime. Upon dilution, long CNTs undergo a 2D lattice expansion, whereas short CNTs seem to have an intermediate expansion between 2D and 3D probably due to the biphasic nature of the system.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |