ArticleScientific reports2016
Dielectric spectroscopy of isotropic liquids and liquid crystal phases with dispersed graphene oxide.
Article in Scientific reports, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed.
- Electrorheological Fluids Based on Porous Carboxyl-Functionalized Polytriphenylamines.ACS applied polymer materials · 2025Article
- Dynamics and Pretransitional Effects in CNanomaterials (Basel, Switzerland) · 2020Article
- Stabilization of liquid crystal blue phases by carbon nanoparticles of varying dimensionality.Nanoscale advances · 2020Article
- Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes.Beilstein journal of nanotechnology · 2019Article
- Lyotropic Liquid Crystal Phases from Anisotropic Nanomaterials.Nanomaterials (Basel, Switzerland) · 2017Review
- Confinement effects on lyotropic nematic liquid crystal phases of graphene oxide dispersions.2d materials · 2017Article
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6 authors.
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Abstract
Graphene oxide (GO) flakes of different sizes were prepared and dispersed in isotropic and nematic (anisotropic) fluid media. The dielectric relaxation behaviour of GO-dispersions was examined for a wide temperature (25-60 (o)C) and frequency range (100 Hz-2 MHz). The mixtures containing GO flakes exhibited varying dielectric relaxation processes, depending on the size of the flakes and the elastic properties of the dispersant fluid. Relaxation frequencies of the GO doped isotropic media, such as isopropanol IPA, were observed to be much lower than the GO doped thermotropic nematic medium 5CB. It is anticipated that the slow relaxation frequencies (~10 kHz) could be resulting from the relaxation modes of the GO flakes while the fast relaxation frequencies (~100 kHz) could indicate strongly slowed down molecular modes of the nematogenic molecules, which are anchored to the GO flakes via dispersion interactions. The relaxation frequencies decreased as the size of the GO flakes in the isotropic solvent was increased. Polarizing microscopy showed that GO flakes with a mean diameter of 10 μm, dispersed in water, formed a lyotropic nematic liquid crystal phase. This lyotropic nematic exhibited the slowest dielectric relaxation process, with relaxation frequencies in the order of 2 kHz, as compared to the GO-isotropic suspension and the GO-doped 5CB.
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