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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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Publication details

The article was received on 06 May 2015, accepted on 24 Jun 2015 and first published on 26 Jun 2015


Article type: Paper
DOI: 10.1039/C5RA08403B
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Citation: RSC Adv., 2015,5, 57820-57827
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    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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