Journal article 946 views
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions
Rheologica Acta, Volume: 57, Issue: 4, Pages: 293 - 306
Swansea University Author: Francesco Del Giudice
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DOI (Published version): 10.1007/s00397-018-1077-9
Abstract
Even though the rheological behavior of aqueous graphene oxide (G-O) dispersions has been shown to be strongly time-dependent, only few transient measurements have been reported in the literature. In this work, we attempt to fill the gap between transient and steady shear rheological characterizatio...
Published in: | Rheologica Acta |
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ISSN: | 0035-4511 1435-1528 |
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Springer Science and Business Media LLC
2018
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URI: | https://cronfa.swan.ac.uk/Record/cronfa41016 |
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<?xml version="1.0"?><rfc1807><datestamp>2018-08-31T12:06:50.9096088</datestamp><bib-version>v2</bib-version><id>41016</id><entry>2018-07-13</entry><title>Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions</title><swanseaauthors><author><sid>742d483071479b44d7888e16166b1309</sid><ORCID>0000-0002-9414-6937</ORCID><firstname>Francesco</firstname><surname>Del Giudice</surname><name>Francesco Del Giudice</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2018-07-13</date><deptcode>CHEG</deptcode><abstract>Even though the rheological behavior of aqueous graphene oxide (G-O) dispersions has been shown to be strongly time-dependent, only few transient measurements have been reported in the literature. In this work, we attempt to fill the gap between transient and steady shear rheological characterizations of aqueous G-O dispersions in the concentration range of 0.004 < ϕ < 3.5 wt%, by conducting comprehensive rheological measurements, including oscillatory shear flow, transient shear flow, and steady shear flow. Steady shear measurements have been performed after the evaluation of transient properties of the G-O dispersions, to assure steady-state conditions. We identify the critical concentration ϕ c = 0.08 wt% (where G-O sheets start to interact) from oscillatory shear experiments. We find that the rheology of G-O dispersions strongly depends on the G-O concentration ϕ. Transient measurements of shear viscosity and first normal stress difference suggest that G-O dispersions behave like nematic polymeric liquid crystals at ϕ/ϕ c = 25, in agreement with other work reported in the literature. G-O dispersions also display a transition from negative to positive values of the first normal stress difference with increasing shear rates. Experimental findings of aqueous graphene oxide dispersions are compared and discussed with models and experiments reported for nematic polymeric liquid crystals, laponite, and organoclay dispersions.</abstract><type>Journal Article</type><journal>Rheologica Acta</journal><volume>57</volume><journalNumber>4</journalNumber><paginationStart>293</paginationStart><paginationEnd>306</paginationEnd><publisher>Springer Science and Business Media LLC</publisher><issnPrint>0035-4511</issnPrint><issnElectronic>1435-1528</issnElectronic><keywords>Graphene oxide, Liquid crystals, 2D suspensions, 2D dispersions, Normal stress, Rheology</keywords><publishedDay>30</publishedDay><publishedMonth>4</publishedMonth><publishedYear>2018</publishedYear><publishedDate>2018-04-30</publishedDate><doi>10.1007/s00397-018-1077-9</doi><url/><notes/><college>COLLEGE NANME</college><department>Chemical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CHEG</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2018-08-31T12:06:50.9096088</lastEdited><Created>2018-07-13T14:46:29.9160791</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Chemical Engineering</level></path><authors><author><firstname>Francesco</firstname><surname>Del Giudice</surname><orcid>0000-0002-9414-6937</orcid><order>1</order></author><author><firstname>Benjamin V.</firstname><surname>Cunning</surname><order>2</order></author><author><firstname>Rodney S.</firstname><surname>Ruoff</surname><order>3</order></author><author><firstname>Amy Q.</firstname><surname>Shen</surname><order>4</order></author></authors><documents/><OutputDurs/></rfc1807> |
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2018-08-31T12:06:50.9096088 v2 41016 2018-07-13 Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions 742d483071479b44d7888e16166b1309 0000-0002-9414-6937 Francesco Del Giudice Francesco Del Giudice true false 2018-07-13 CHEG Even though the rheological behavior of aqueous graphene oxide (G-O) dispersions has been shown to be strongly time-dependent, only few transient measurements have been reported in the literature. In this work, we attempt to fill the gap between transient and steady shear rheological characterizations of aqueous G-O dispersions in the concentration range of 0.004 < ϕ < 3.5 wt%, by conducting comprehensive rheological measurements, including oscillatory shear flow, transient shear flow, and steady shear flow. Steady shear measurements have been performed after the evaluation of transient properties of the G-O dispersions, to assure steady-state conditions. We identify the critical concentration ϕ c = 0.08 wt% (where G-O sheets start to interact) from oscillatory shear experiments. We find that the rheology of G-O dispersions strongly depends on the G-O concentration ϕ. Transient measurements of shear viscosity and first normal stress difference suggest that G-O dispersions behave like nematic polymeric liquid crystals at ϕ/ϕ c = 25, in agreement with other work reported in the literature. G-O dispersions also display a transition from negative to positive values of the first normal stress difference with increasing shear rates. Experimental findings of aqueous graphene oxide dispersions are compared and discussed with models and experiments reported for nematic polymeric liquid crystals, laponite, and organoclay dispersions. Journal Article Rheologica Acta 57 4 293 306 Springer Science and Business Media LLC 0035-4511 1435-1528 Graphene oxide, Liquid crystals, 2D suspensions, 2D dispersions, Normal stress, Rheology 30 4 2018 2018-04-30 10.1007/s00397-018-1077-9 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2018-08-31T12:06:50.9096088 2018-07-13T14:46:29.9160791 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Francesco Del Giudice 0000-0002-9414-6937 1 Benjamin V. Cunning 2 Rodney S. Ruoff 3 Amy Q. Shen 4 |
title |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
spellingShingle |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions Francesco Del Giudice |
title_short |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
title_full |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
title_fullStr |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
title_full_unstemmed |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
title_sort |
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions |
author_id_str_mv |
742d483071479b44d7888e16166b1309 |
author_id_fullname_str_mv |
742d483071479b44d7888e16166b1309_***_Francesco Del Giudice |
author |
Francesco Del Giudice |
author2 |
Francesco Del Giudice Benjamin V. Cunning Rodney S. Ruoff Amy Q. Shen |
format |
Journal article |
container_title |
Rheologica Acta |
container_volume |
57 |
container_issue |
4 |
container_start_page |
293 |
publishDate |
2018 |
institution |
Swansea University |
issn |
0035-4511 1435-1528 |
doi_str_mv |
10.1007/s00397-018-1077-9 |
publisher |
Springer Science and Business Media LLC |
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Faculty of Science and Engineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering |
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description |
Even though the rheological behavior of aqueous graphene oxide (G-O) dispersions has been shown to be strongly time-dependent, only few transient measurements have been reported in the literature. In this work, we attempt to fill the gap between transient and steady shear rheological characterizations of aqueous G-O dispersions in the concentration range of 0.004 < ϕ < 3.5 wt%, by conducting comprehensive rheological measurements, including oscillatory shear flow, transient shear flow, and steady shear flow. Steady shear measurements have been performed after the evaluation of transient properties of the G-O dispersions, to assure steady-state conditions. We identify the critical concentration ϕ c = 0.08 wt% (where G-O sheets start to interact) from oscillatory shear experiments. We find that the rheology of G-O dispersions strongly depends on the G-O concentration ϕ. Transient measurements of shear viscosity and first normal stress difference suggest that G-O dispersions behave like nematic polymeric liquid crystals at ϕ/ϕ c = 25, in agreement with other work reported in the literature. G-O dispersions also display a transition from negative to positive values of the first normal stress difference with increasing shear rates. Experimental findings of aqueous graphene oxide dispersions are compared and discussed with models and experiments reported for nematic polymeric liquid crystals, laponite, and organoclay dispersions. |
published_date |
2018-04-30T03:52:16Z |
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1763752580802936832 |
score |
11.016258 |