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Pradip Kumar
나노물질 및 화학반응 연구단
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Rheological properties of graphene oxide liquid crystal

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Title
Rheological properties of graphene oxide liquid crystal
Author(s)
Pradip Kumar; Uday Narayan Maiti; Kyung Eun Lee; Sang Ouk Kim
Publication Date
2014-12
Journal
CARBON, v.80, no.1, pp.453 - 461
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
We report the rheological properties of liquid crystalline graphene oxide (GO) aqueous dispersion. GO dispersions exhibit typical shear thinning behaviors of liquid crystals, which is described by power law or simple Curreau model. Irrespective of the shear rate, shear viscosity exhibits sudden decrease with the increase of GO composition around a critical volume fraction, /c = 0.33%, demonstrating typical colloidal isotropic–nematic phase transition. Dynamic measurements reveal the liquid-like (isotropic phase, G0 > G00) behavior at a low GO composition (/ 0.08%) and solid-like (liquid crystalline) behavior at higher compositions (/ 0.45%), where G0 exceeds over G00. Nematic gel-like phase is confirmed at a higher GO composition over / > 0.83%, where both G0 and G00 moduli are nearly independent of frequency (x). Simple power law scaling arguments are introduced to model the dependence of yield stress and viscoelastic moduli on the GO composition. We also observed the yield stress and rigidity percolation transition above phase transition composition /c > 0.33% with a percolation exponent of 1.3 ± 0.1. These rheological insights provide valuable information for the liquid crystalline processing of GO based materials including fibers, sheets and other complex structures for electronic/optoelectronic and energy storage/ conversion applications.
URI
https://pr.ibs.re.kr/handle/8788114/1439
ISSN
0008-6223
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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