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Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry

Daniel Curtis Orcid Logo, Nafiseh Badiei, A. Holder, James Claypole, Davide Deganello Orcid Logo, Rowan Brown Orcid Logo, Matthew Lawrence, Adrian Evans Orcid Logo, Rhodri Williams Orcid Logo, Karl Hawkins Orcid Logo

Journal of Non-Newtonian Fluid Mechanics, Volume: 222, Pages: 227 - 233

Swansea University Authors: Daniel Curtis Orcid Logo, Nafiseh Badiei, James Claypole, Davide Deganello Orcid Logo, Rowan Brown Orcid Logo, Matthew Lawrence, Adrian Evans Orcid Logo, Rhodri Williams Orcid Logo, Karl Hawkins Orcid Logo

Abstract

Processes involving a unidirectional shear flow component are widespread in industrial manufacturing techniques such as printing and coating, or in physiological events such as blood coagulation. Standard rheometric techniques are usually employed under quiescent conditions and as such are inappropr...

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Published in: Journal of Non-Newtonian Fluid Mechanics
ISSN: 0377-0257
Published: Elsevier BV 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa20274
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Standard rheometric techniques are usually employed under quiescent conditions and as such are inappropriate for the study of microstructural modification induced by the presence of a unidirectional shear flow. We demonstrate how controlled stress parallel superposition (CSPS) may be exploited to enable accurate detection of the Gel Point and analysis of Gel Point parameters for systems undergoing a viscoelastic liquid (VEL) to viscoelastic solid (VES) transition in the presence of a unidirectional flow field. Specifically, we note that certain features of the CSPS experiment, when performed near the Gel Point, may obviate previously reported concerns regarding the experiment. A biopolymer system (gelatin) which forms gels by thermoreversible gelation is employed as a model gelling material to confirm the ability of CSPS to characterise the stress relaxation characteristics of critical-gels in the presence of a) progressively decreasing and b) progressively increasing unidirectional strain rate and oscillatory strain amplitude. Additional validation of CSPS results is reported for a silicone dielectric gel used in the industrial production of printed electronic products. Finally, CSPS is used to investigate microstructural modification of fibrin-thrombin gels as a consequence of clot formation under a unidirectional shear stress. 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spelling 2022-11-02T16:28:14.9173020 v2 20274 2015-03-09 Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry e76ff28a23af2fe37099c4e9a24c1e58 0000-0002-6955-0524 Daniel Curtis Daniel Curtis true false c82cd1b82759801ab0045cb9f0047b06 Nafiseh Badiei Nafiseh Badiei true false 0e33dfb4c8d099d6648af8812a472a05 James Claypole James Claypole true false ea38a0040bdfd3875506189e3629b32a 0000-0001-8341-4177 Davide Deganello Davide Deganello true false d7db8d42c476dfa69c15ce06d29bd863 0000-0003-3628-2524 Rowan Brown Rowan Brown true false 262d0cae7663ded863d6e2de15757f3c Matthew Lawrence Matthew Lawrence true false 21761f6eb805546a561c9f036e85405b 0000-0002-0814-5162 Adrian Evans Adrian Evans true false 642bf793695f412ed932f1ea4d9bc3f1 0000-0002-6912-5288 Rhodri Williams Rhodri Williams true false 77c39404a9a98c6e2283d84815cba053 0000-0003-0174-4151 Karl Hawkins Karl Hawkins true false 2015-03-09 CHEG Processes involving a unidirectional shear flow component are widespread in industrial manufacturing techniques such as printing and coating, or in physiological events such as blood coagulation. Standard rheometric techniques are usually employed under quiescent conditions and as such are inappropriate for the study of microstructural modification induced by the presence of a unidirectional shear flow. We demonstrate how controlled stress parallel superposition (CSPS) may be exploited to enable accurate detection of the Gel Point and analysis of Gel Point parameters for systems undergoing a viscoelastic liquid (VEL) to viscoelastic solid (VES) transition in the presence of a unidirectional flow field. Specifically, we note that certain features of the CSPS experiment, when performed near the Gel Point, may obviate previously reported concerns regarding the experiment. A biopolymer system (gelatin) which forms gels by thermoreversible gelation is employed as a model gelling material to confirm the ability of CSPS to characterise the stress relaxation characteristics of critical-gels in the presence of a) progressively decreasing and b) progressively increasing unidirectional strain rate and oscillatory strain amplitude. Additional validation of CSPS results is reported for a silicone dielectric gel used in the industrial production of printed electronic products. Finally, CSPS is used to investigate microstructural modification of fibrin-thrombin gels as a consequence of clot formation under a unidirectional shear stress. The results confirm the validity of the CSPS technique in gelation studies and the technique is used, for the first time, to directly record the thermally induced VES to VEL transition in aqueous gelatin systems. Journal Article Journal of Non-Newtonian Fluid Mechanics 222 227 233 Elsevier BV 0377-0257 Gel Point; Critical Gel; Controlled Stress Parallel Superposition 1 8 2015 2015-08-01 10.1016/j.jnnfm.2014.12.004 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/). COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2022-11-02T16:28:14.9173020 2015-03-09T07:59:10.2326409 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine Daniel Curtis 0000-0002-6955-0524 1 Nafiseh Badiei 2 A. Holder 3 James Claypole 4 Davide Deganello 0000-0001-8341-4177 5 Rowan Brown 0000-0003-3628-2524 6 Matthew Lawrence 7 Adrian Evans 0000-0002-0814-5162 8 Rhodri Williams 0000-0002-6912-5288 9 Karl Hawkins 0000-0003-0174-4151 10 0020274-15072016135927.pdf curtis2014.pdf 2016-07-15T13:59:27.4470000 Output 738642 application/pdf Version of Record true 2016-07-15T00:00:00.0000000 false
title Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
spellingShingle Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
Daniel Curtis
Nafiseh Badiei
James Claypole
Davide Deganello
Rowan Brown
Matthew Lawrence
Adrian Evans
Rhodri Williams
Karl Hawkins
title_short Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
title_full Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
title_fullStr Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
title_full_unstemmed Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
title_sort Assessment of the stress relaxation characteristics of critical gels formed under unidirectional shear flow by controlled stress parallel superposition rheometry
author_id_str_mv e76ff28a23af2fe37099c4e9a24c1e58
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author_id_fullname_str_mv e76ff28a23af2fe37099c4e9a24c1e58_***_Daniel Curtis
c82cd1b82759801ab0045cb9f0047b06_***_Nafiseh Badiei
0e33dfb4c8d099d6648af8812a472a05_***_James Claypole
ea38a0040bdfd3875506189e3629b32a_***_Davide Deganello
d7db8d42c476dfa69c15ce06d29bd863_***_Rowan Brown
262d0cae7663ded863d6e2de15757f3c_***_Matthew Lawrence
21761f6eb805546a561c9f036e85405b_***_Adrian Evans
642bf793695f412ed932f1ea4d9bc3f1_***_Rhodri Williams
77c39404a9a98c6e2283d84815cba053_***_Karl Hawkins
author Daniel Curtis
Nafiseh Badiei
James Claypole
Davide Deganello
Rowan Brown
Matthew Lawrence
Adrian Evans
Rhodri Williams
Karl Hawkins
author2 Daniel Curtis
Nafiseh Badiei
A. Holder
James Claypole
Davide Deganello
Rowan Brown
Matthew Lawrence
Adrian Evans
Rhodri Williams
Karl Hawkins
format Journal article
container_title Journal of Non-Newtonian Fluid Mechanics
container_volume 222
container_start_page 227
publishDate 2015
institution Swansea University
issn 0377-0257
doi_str_mv 10.1016/j.jnnfm.2014.12.004
publisher Elsevier BV
college_str Faculty of Medicine, Health and Life Sciences
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hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine
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description Processes involving a unidirectional shear flow component are widespread in industrial manufacturing techniques such as printing and coating, or in physiological events such as blood coagulation. Standard rheometric techniques are usually employed under quiescent conditions and as such are inappropriate for the study of microstructural modification induced by the presence of a unidirectional shear flow. We demonstrate how controlled stress parallel superposition (CSPS) may be exploited to enable accurate detection of the Gel Point and analysis of Gel Point parameters for systems undergoing a viscoelastic liquid (VEL) to viscoelastic solid (VES) transition in the presence of a unidirectional flow field. Specifically, we note that certain features of the CSPS experiment, when performed near the Gel Point, may obviate previously reported concerns regarding the experiment. A biopolymer system (gelatin) which forms gels by thermoreversible gelation is employed as a model gelling material to confirm the ability of CSPS to characterise the stress relaxation characteristics of critical-gels in the presence of a) progressively decreasing and b) progressively increasing unidirectional strain rate and oscillatory strain amplitude. Additional validation of CSPS results is reported for a silicone dielectric gel used in the industrial production of printed electronic products. Finally, CSPS is used to investigate microstructural modification of fibrin-thrombin gels as a consequence of clot formation under a unidirectional shear stress. The results confirm the validity of the CSPS technique in gelation studies and the technique is used, for the first time, to directly record the thermally induced VES to VEL transition in aqueous gelatin systems.
published_date 2015-08-01T03:25:31Z
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