Graphene oxide modified by betaine moieties for improvement of electrorheological performance

Citation data:

RSC Advances, ISSN: 2046-2069, Vol: 5, Issue: 71, Page: 57820-57827

Publication Year:
2015
Usage 291
Abstract Views 286
Downloads 5
Citations 11
Citation Indexes 11
Repository URL:
http://publikace.k.utb.cz/handle/10563/1005280; http://hdl.handle.net/10563/1005280
DOI:
10.1039/c5ra08403b
Author(s):
Ilčíková, Markéta; Mrlík, Miroslav; Babayan, Vladimír Artur; Kasák, Peter
Publisher(s):
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Tags:
Chemistry; Chemical Engineering
article description
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.