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Carbon black dispersions in surfactant-based microemulsion

Published online by Cambridge University Press:  02 January 2018

Mohamed Youssry ,
Dominique Guyomard  and
Bernard Lestriez
Mohamed Youssry*
Affiliation:
Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha 2713, Qatar
Dominique Guyomard
Affiliation:
Institut des Matériaux Jean Rouxel, Centre National de la Recherche Scientifique (CNRS), Université de Nantes, Nantes Cedex 3 44322, France
Bernard Lestriez
Affiliation:
Institut des Matériaux Jean Rouxel, Centre National de la Recherche Scientifique (CNRS), Université de Nantes, Nantes Cedex 3 44322, France
*
a)Address all correspondence to this author. e-mail: myoussry@qu.edu.qa
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Abstract

In an attempt to introduce a novel approach to formulate carbon black (ketjen black) suspension with enhanced colloidal stability, improved flowability, and higher conductivity, ketjen black was dispersed in microemulsion systems composed of a non-ionic surfactant (Triton X100), decanol, and water. Rheo-electric and rheo-microscopy proved to be very powerful techniques that are able to elucidate the microstructure evolution with the composition and under shear flow. Interestingly, the carbon black slurries at low decanol/water ratio are weak gels (flowable) with higher electrical conductivity than those at higher ratio, which shows strong-gel viscoelastic response. In addition, the slurries show recoverable electrical behavior under shear flow in tandem with the viscosity trend. It is likely that the oil-in-water microemulsion enhances slurries’ stability without affecting the percolating network of carbon black. On the other hand, the oil-in-water analogous and bilayer structure of the lamellar phase makes the slurries less conductive as a consequence of losing the network percolation.

Keywords

colloidviscoelasticitymicrostructure

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Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 9: Focus Issue: Porous Carbon and Carbonaceous Materials for Energy Conversion and Storage , 14 May 2018 , pp. 1301 - 1307
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Yat Li

References

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