Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels
<p dir="ltr">This paper presents a rheological study describing the effects of shear on the flow curves of colloidal gels prepared with different concentrations of fumed silica (4%, 5%, 6%, and 7%) and a hydrophobic solvent (Hydrocarbon fuel, JP-8). Viscosity measurements as a functi...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , |
| منشور في: |
2017
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| الموضوعات: | |
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إضافة وسم
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| _version_ | 1864513557119369216 |
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| author | Paulo Santos (488565) |
| author2 | Marcelo Carignano (1390921) Osvaldo Campanella (1768339) |
| author2_role | author author |
| author_facet | Paulo Santos (488565) Marcelo Carignano (1390921) Osvaldo Campanella (1768339) |
| author_role | author |
| dc.creator.none.fl_str_mv | Paulo Santos (488565) Marcelo Carignano (1390921) Osvaldo Campanella (1768339) |
| dc.date.none.fl_str_mv | 2017-11-20T03:00:00Z |
| dc.identifier.none.fl_str_mv | 10.3390/gels3040045 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Effect_of_Shear_History_on_Rheology_of_Time-Dependent_Colloidal_Silica_Gels/27082714 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Chemical engineering Fluid mechanics and thermal engineering gel silica rheology thixotropy microstructure viscosity JP-8 fuel |
| dc.title.none.fl_str_mv | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">This paper presents a rheological study describing the effects of shear on the flow curves of colloidal gels prepared with different concentrations of fumed silica (4%, 5%, 6%, and 7%) and a hydrophobic solvent (Hydrocarbon fuel, JP-8). Viscosity measurements as a function of time were carried out at different shear rates (10, 50, 100, 500, and 1000 s<sup>−1</sup>), and based on this data, a new structural kinetics model was used to describe the system. Previous work has based the analysis of time dependent fluids on the viscosity of the intact material, i.e., before it is sheared, which is a condition very difficult to achieve when weak gels are tested. The simple action of loading the gel in the rheometer affects its structure and rheology, and the reproducibility of the measurements is thus seriously compromised. Changes in viscosity and viscoelastic properties of the sheared material are indicative of microstructural changes in the gel that need to be accounted for. Therefore, a more realistic method is presented in this work. In addition, microscopical images (Cryo-SEM) were obtained to show how the structure of the gel is affected upon application of shear.</p><h2>Other Information</h2><p dir="ltr">Published in: Gels<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/gels3040045" target="_blank">https://dx.doi.org/10.3390/gels3040045</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_1d4722e30b693f164587a6ae51b99daf |
| identifier_str_mv | 10.3390/gels3040045 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/27082714 |
| publishDate | 2017 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica GelsPaulo Santos (488565)Marcelo Carignano (1390921)Osvaldo Campanella (1768339)EngineeringChemical engineeringFluid mechanics and thermal engineeringgelsilicarheologythixotropymicrostructureviscosityJP-8fuel<p dir="ltr">This paper presents a rheological study describing the effects of shear on the flow curves of colloidal gels prepared with different concentrations of fumed silica (4%, 5%, 6%, and 7%) and a hydrophobic solvent (Hydrocarbon fuel, JP-8). Viscosity measurements as a function of time were carried out at different shear rates (10, 50, 100, 500, and 1000 s<sup>−1</sup>), and based on this data, a new structural kinetics model was used to describe the system. Previous work has based the analysis of time dependent fluids on the viscosity of the intact material, i.e., before it is sheared, which is a condition very difficult to achieve when weak gels are tested. The simple action of loading the gel in the rheometer affects its structure and rheology, and the reproducibility of the measurements is thus seriously compromised. Changes in viscosity and viscoelastic properties of the sheared material are indicative of microstructural changes in the gel that need to be accounted for. Therefore, a more realistic method is presented in this work. In addition, microscopical images (Cryo-SEM) were obtained to show how the structure of the gel is affected upon application of shear.</p><h2>Other Information</h2><p dir="ltr">Published in: Gels<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/gels3040045" target="_blank">https://dx.doi.org/10.3390/gels3040045</a></p>2017-11-20T03:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.3390/gels3040045https://figshare.com/articles/journal_contribution/Effect_of_Shear_History_on_Rheology_of_Time-Dependent_Colloidal_Silica_Gels/27082714CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/270827142017-11-20T03:00:00Z |
| spellingShingle | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels Paulo Santos (488565) Engineering Chemical engineering Fluid mechanics and thermal engineering gel silica rheology thixotropy microstructure viscosity JP-8 fuel |
| status_str | publishedVersion |
| title | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| title_full | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| title_fullStr | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| title_full_unstemmed | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| title_short | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| title_sort | Effect of Shear History on Rheology of Time-Dependent Colloidal Silica Gels |
| topic | Engineering Chemical engineering Fluid mechanics and thermal engineering gel silica rheology thixotropy microstructure viscosity JP-8 fuel |