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The observation of a conductivity threshold on the electrorheological effect of p-phenylenediamine oxidized with p-benzoquinone

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dc.title The observation of a conductivity threshold on the electrorheological effect of p-phenylenediamine oxidized with p-benzoquinone en
dc.contributor.author Plachý, Tomáš
dc.contributor.author Sedlačík, Michal
dc.contributor.author Pavlínek, Vladimír
dc.contributor.author Stejskal, Jaroslav
dc.relation.ispartof Journal of Materials Chemistry C
dc.identifier.issn 2050-7534 Scopus Sources, Sherpa/RoMEO, JCR
dc.identifier.issn 2050-7526 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2015
utb.relation.volume 3
utb.relation.issue 38
dc.citation.spage 9973
dc.citation.epage 9980
dc.type article
dc.language.iso en
dc.publisher Royal Society of Chemistry (RSC)
dc.identifier.doi 10.1039/c5tc02119g
dc.relation.uri http://pubs.rsc.org/en/Content/ArticleLanding/2015/TC/C5TC02119G#!divAbstract
dc.description.abstract p-Phenylenediamine was oxidized with p-benzoquinone in the presence of 0.1-5 M methanesulfonic acid (MSA) solutions. The resulting methanesulfonate salts of 2,5-(di-p-phenylenediamine)-1,4-benzoquinone are semiconducting and the particles were further suspended in silicone oil in a weight ratio of 1 : 9 in order to create novel electrorheological fluids. Conductivity measurements using the two-point method along with dielectric spectroscopy were carried out in order to investigate their electrical and dielectric properties, including their silicone-oil suspensions. The higher the concentration of MSA was present during the synthesis, the higher the conductivity was observed. Nevertheless, a certain threshold of the ER effect has been found and a further significant increase in conductivity causes only a slight ER effect enhancement. At an electric field strength of 1.5 kV mm-1, the observed yield stresses read at the low shear rate values were 11.5 Pa, 20.3 Pa, 24.5 Pa, and 28.2 Pa for particles with conductivities 1.5 × 10-12, 8.5 × 10-11, 1.0 × 10-8, and 1.5 × 10-7 S cm-1, respectively. From dielectric spectra, it was observed that the conductivity of the particles determines the relaxation times of their silicone-oil suspensions. This journal is © The Royal Society of Chemistry. en
utb.faculty University Institute
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1005694
utb.identifier.rivid RIV/70883521:28610/15:43873181!RIV16-MSM-28610___
utb.identifier.obdid 43873612
utb.identifier.scopus 2-s2.0-84942474951
utb.identifier.wok 000361835600026
utb.identifier.coden JMCCC
utb.source j-wok
dc.date.accessioned 2015-11-05T11:27:35Z
dc.date.available 2015-11-05T11:27:35Z
dc.description.sponsorship P205/12/0911, GACR, Czech Science Foundation
dc.description.sponsorship Internal Grant Agency of Tomas Bata University [IGA/CPS/2015/007]; Ministry of Education, Youth and Sports of the Czech Republic - Program NPU I [LO1504]; Czech Science Foundation [P205/12/0911]
dc.rights Attribution-NonCommercial-NoDerivs 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/
dc.rights.access openAccess
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Plachý, Tomáš
utb.contributor.internalauthor Sedlačík, Michal
utb.contributor.internalauthor Pavlínek, Vladimír
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