Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/116891 |
Resumo: | The newest generation of lubricants needs to adapt to stricter environmental policies. Simple and sustainable formulations with tunable rheological properties under the action of electric potentials may be the key. The present research explored the feasibility of producing electro-sensitive ecolubricants based on nanocellulose (crystalline and fibrillar) or nanoclay (Cloisite 15A montmorillonite and halloysite nanotubes) dispersions in castor oil, at concentrations that ranged from 2 to 6 wt.%. Broadband dielectric spectroscopy (BDS) measurements allowed for a first estimate on the electro-responsive potential of the nanofluids. The nanocelluloses and the montmorillonite suspensions presented a relaxation event in the dielectric loss, e", centered at ca. 2-4 kHz, which is related to interfacial polarization. Moreover, their actual electro-rheological (ER) effect under high electric potentials up to 4 kV/mm was assessed by determining the magnitude of the yield stress from steady flow curves at 25 °C. It was found that the nanocelluloses and the montmorillonite showed an enhancement of three orders of magnitude in their yield stress values at 4 kV/m. This enhancement was much greater than in the halloysite nanoclay, which did not exhibit any polarization). This is the starting point for the development of environmentally friendly ER lubricating fluids, based on nanocellulose and montmorillonites (layered nanosilicates), which might assist in reducing the friction and wear through the application of controlled electric fields. |
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Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oilCastor oilDielectric spectroscopyEcolubricantsElectro-rheologyNanocelluloseNanoclaysNanofluidsSmarts fluidsBioengineeringChemical Engineering (miscellaneous)Process Chemistry and TechnologyThe newest generation of lubricants needs to adapt to stricter environmental policies. Simple and sustainable formulations with tunable rheological properties under the action of electric potentials may be the key. The present research explored the feasibility of producing electro-sensitive ecolubricants based on nanocellulose (crystalline and fibrillar) or nanoclay (Cloisite 15A montmorillonite and halloysite nanotubes) dispersions in castor oil, at concentrations that ranged from 2 to 6 wt.%. Broadband dielectric spectroscopy (BDS) measurements allowed for a first estimate on the electro-responsive potential of the nanofluids. The nanocelluloses and the montmorillonite suspensions presented a relaxation event in the dielectric loss, e", centered at ca. 2-4 kHz, which is related to interfacial polarization. Moreover, their actual electro-rheological (ER) effect under high electric potentials up to 4 kV/mm was assessed by determining the magnitude of the yield stress from steady flow curves at 25 °C. It was found that the nanocelluloses and the montmorillonite showed an enhancement of three orders of magnitude in their yield stress values at 4 kV/m. This enhancement was much greater than in the halloysite nanoclay, which did not exhibit any polarization). This is the starting point for the development of environmentally friendly ER lubricating fluids, based on nanocellulose and montmorillonites (layered nanosilicates), which might assist in reducing the friction and wear through the application of controlled electric fields.CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)DCM - Departamento de Ciência dos MateriaisRUNGarcía-Morales, MoisésFernández-Silva, Samuel D.Roman, ClaudiaOlariu, Marius A.Cidade, Maria T.Delgado, Miguel A.2021-05-03T22:53:38Z2020-09-012020-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10362/116891eng1532-6950PURE: 26068782https://doi.org/10.3390/pr8091060info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:59:45Zoai:run.unl.pt:10362/116891Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:43:21.229168Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
title |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
spellingShingle |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil García-Morales, Moisés Castor oil Dielectric spectroscopy Ecolubricants Electro-rheology Nanocellulose Nanoclays Nanofluids Smarts fluids Bioengineering Chemical Engineering (miscellaneous) Process Chemistry and Technology |
title_short |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
title_full |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
title_fullStr |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
title_full_unstemmed |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
title_sort |
Preliminary insights into electro-sensitive ecolubricants: A comparative analysis based on nanocelluloses and nanosilicates in castor oil |
author |
García-Morales, Moisés |
author_facet |
García-Morales, Moisés Fernández-Silva, Samuel D. Roman, Claudia Olariu, Marius A. Cidade, Maria T. Delgado, Miguel A. |
author_role |
author |
author2 |
Fernández-Silva, Samuel D. Roman, Claudia Olariu, Marius A. Cidade, Maria T. Delgado, Miguel A. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N) DCM - Departamento de Ciência dos Materiais RUN |
dc.contributor.author.fl_str_mv |
García-Morales, Moisés Fernández-Silva, Samuel D. Roman, Claudia Olariu, Marius A. Cidade, Maria T. Delgado, Miguel A. |
dc.subject.por.fl_str_mv |
Castor oil Dielectric spectroscopy Ecolubricants Electro-rheology Nanocellulose Nanoclays Nanofluids Smarts fluids Bioengineering Chemical Engineering (miscellaneous) Process Chemistry and Technology |
topic |
Castor oil Dielectric spectroscopy Ecolubricants Electro-rheology Nanocellulose Nanoclays Nanofluids Smarts fluids Bioengineering Chemical Engineering (miscellaneous) Process Chemistry and Technology |
description |
The newest generation of lubricants needs to adapt to stricter environmental policies. Simple and sustainable formulations with tunable rheological properties under the action of electric potentials may be the key. The present research explored the feasibility of producing electro-sensitive ecolubricants based on nanocellulose (crystalline and fibrillar) or nanoclay (Cloisite 15A montmorillonite and halloysite nanotubes) dispersions in castor oil, at concentrations that ranged from 2 to 6 wt.%. Broadband dielectric spectroscopy (BDS) measurements allowed for a first estimate on the electro-responsive potential of the nanofluids. The nanocelluloses and the montmorillonite suspensions presented a relaxation event in the dielectric loss, e", centered at ca. 2-4 kHz, which is related to interfacial polarization. Moreover, their actual electro-rheological (ER) effect under high electric potentials up to 4 kV/mm was assessed by determining the magnitude of the yield stress from steady flow curves at 25 °C. It was found that the nanocelluloses and the montmorillonite showed an enhancement of three orders of magnitude in their yield stress values at 4 kV/m. This enhancement was much greater than in the halloysite nanoclay, which did not exhibit any polarization). This is the starting point for the development of environmentally friendly ER lubricating fluids, based on nanocellulose and montmorillonites (layered nanosilicates), which might assist in reducing the friction and wear through the application of controlled electric fields. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-09-01 2020-09-01T00:00:00Z 2021-05-03T22:53:38Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/116891 |
url |
http://hdl.handle.net/10362/116891 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1532-6950 PURE: 26068782 https://doi.org/10.3390/pr8091060 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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