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Issue 71, 2015
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Graphene oxide modified by betaine moieties for improvement of electrorheological performance

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Abstract

Novel graphene oxide bearing betaine moieties as sulfobetaine (GO-SB), carboxybetaine (GO-CB) and carboxybetaine ester (GO-CBE) moieties were prepared in two simple fabrication processes based on silanization and a thiol–ene click-reaction. Betaine modified particles showed appropriate electrical conductivity for electrorheological applications and the electrorheological behavior was confirmed by on-line microscopic observation. Analysis of the dielectric data using the Havriliak–Negami model showed that the suspension bearing the carboxybetaine ester moiety (GO-CBE) in silicone oil had the highest dielectric relaxation strength and fastest relaxation time due to enhanced charge transfer caused by a specific carboxybetaine ester feature. Analysis of the rheological data of the prepared suspensions at various external fields by the power-law model revealed that the conductivity mechanism is responsible for the electrorheological effect. Development of the internal structures was considerably improved for the GO-CBE sample with a yield stress up to 97 Pa at 5 wt% GO-CBE particles in suspension.

Graphical abstract: Graphene oxide modified by betaine moieties for improvement of electrorheological performance

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Supplementary files

Article information


Submitted
06 May 2015
Accepted
24 Jun 2015
First published
26 Jun 2015

RSC Adv., 2015,5, 57820-57827
Article type
Paper
Author version available

Graphene oxide modified by betaine moieties for improvement of electrorheological performance

M. Ilčíková, M. Mrlík, V. Babayan and P. Kasák, RSC Adv., 2015, 5, 57820
DOI: 10.1039/C5RA08403B

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