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Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions

Francesco Del Giudice Orcid Logo, Benjamin V. Cunning, Rodney S. Ruoff, Amy Q. Shen

Rheologica Acta, Volume: 57, Issue: 4, Pages: 293 - 306

Swansea University Author: Francesco Del Giudice Orcid Logo

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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...

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Published in: Rheologica Acta
ISSN: 0035-4511 1435-1528
Published: Springer Science and Business Media LLC 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa41016
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first_indexed 2018-07-13T19:35:36Z
last_indexed 2018-08-31T13:37:53Z
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spelling 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
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 0
active_str 0
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
_version_ 1763752580802936832
score 11.014358

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