Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness

Detalhes bibliográficos
Autor(a) principal: Almeida, Ricardo O.
Data de Publicação: 2021
Outros Autores: Ferraz, Eduardo, Santarén, Julio, Gamelas, José A. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/105283
https://doi.org/10.3390/nano11061579
Resumo: The surface properties of two sepiolite samples and one palygorskite sample were compared using inverse gas chromatography (IGC). Samples were previously conditioned at appropriate temperatures for the removal of all zeolitic water. Dispersive (or Lifshitz-van der Waals) component of the surface energy (γsd), specific interactions (-ΔGas) with π electron donor bases (1-alkenes), and nanomorphology indices (IMχT) based on the injections of cycloalkanes and a branched alkane were measured. From IGC data, at 240 °C, it was found that the palygorskite was clearly distinguished from the sepiolites. The palygorskite possessed a lower γsd, larger -ΔGas with 1-alkenes, and remarkably higher IMχT. Slight differences could also be observed between the two sepiolite samples with the same origin. The results were rationalized in terms of the structural features of the two studied minerals. The larger channels of the sepiolite allow for a better insertion of the n-alkanes (longer retention times) while excluding the bulkier probes, such as cyclooctane or 2,2,4-trimethylpentane. Accordingly, the corresponding γsd values were larger and the IMχT values were lower (higher surface nanoroughness) for the sepiolites. Regarding Lewis acid-base properties, all the sample's surfaces evidenced a very strong amphoteric character. The present results highlight the potential of the evaluated samples for, e.g., adsorption processes with volatile organic compounds or matrix-filler interactions regarding the production of composite structures with Lewis acid-base matrices.
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spelling Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughnessadsorptionaluminosilicateattapulgiteclay mineralsfibrous mineralsinverse gas chromatographyThe surface properties of two sepiolite samples and one palygorskite sample were compared using inverse gas chromatography (IGC). Samples were previously conditioned at appropriate temperatures for the removal of all zeolitic water. Dispersive (or Lifshitz-van der Waals) component of the surface energy (γsd), specific interactions (-ΔGas) with π electron donor bases (1-alkenes), and nanomorphology indices (IMχT) based on the injections of cycloalkanes and a branched alkane were measured. From IGC data, at 240 °C, it was found that the palygorskite was clearly distinguished from the sepiolites. The palygorskite possessed a lower γsd, larger -ΔGas with 1-alkenes, and remarkably higher IMχT. Slight differences could also be observed between the two sepiolite samples with the same origin. The results were rationalized in terms of the structural features of the two studied minerals. The larger channels of the sepiolite allow for a better insertion of the n-alkanes (longer retention times) while excluding the bulkier probes, such as cyclooctane or 2,2,4-trimethylpentane. Accordingly, the corresponding γsd values were larger and the IMχT values were lower (higher surface nanoroughness) for the sepiolites. Regarding Lewis acid-base properties, all the sample's surfaces evidenced a very strong amphoteric character. The present results highlight the potential of the evaluated samples for, e.g., adsorption processes with volatile organic compounds or matrix-filler interactions regarding the production of composite structures with Lewis acid-base matrices.MDPI2021-06-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/105283http://hdl.handle.net/10316/105283https://doi.org/10.3390/nano11061579eng2079-4991Almeida, Ricardo O.Ferraz, EduardoSantarén, JulioGamelas, José A. F.info: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:RCAAP2023-02-14T12:26:38Zoai:estudogeral.uc.pt:10316/105283Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:21:52.756193Repositório 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 Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
title Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
spellingShingle Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
Almeida, Ricardo O.
adsorption
aluminosilicate
attapulgite
clay minerals
fibrous minerals
inverse gas chromatography
title_short Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
title_full Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
title_fullStr Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
title_full_unstemmed Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
title_sort Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness
author Almeida, Ricardo O.
author_facet Almeida, Ricardo O.
Ferraz, Eduardo
Santarén, Julio
Gamelas, José A. F.
author_role author
author2 Ferraz, Eduardo
Santarén, Julio
Gamelas, José A. F.
author2_role author
author
author
dc.contributor.author.fl_str_mv Almeida, Ricardo O.
Ferraz, Eduardo
Santarén, Julio
Gamelas, José A. F.
dc.subject.por.fl_str_mv adsorption
aluminosilicate
attapulgite
clay minerals
fibrous minerals
inverse gas chromatography
topic adsorption
aluminosilicate
attapulgite
clay minerals
fibrous minerals
inverse gas chromatography
description The surface properties of two sepiolite samples and one palygorskite sample were compared using inverse gas chromatography (IGC). Samples were previously conditioned at appropriate temperatures for the removal of all zeolitic water. Dispersive (or Lifshitz-van der Waals) component of the surface energy (γsd), specific interactions (-ΔGas) with π electron donor bases (1-alkenes), and nanomorphology indices (IMχT) based on the injections of cycloalkanes and a branched alkane were measured. From IGC data, at 240 °C, it was found that the palygorskite was clearly distinguished from the sepiolites. The palygorskite possessed a lower γsd, larger -ΔGas with 1-alkenes, and remarkably higher IMχT. Slight differences could also be observed between the two sepiolite samples with the same origin. The results were rationalized in terms of the structural features of the two studied minerals. The larger channels of the sepiolite allow for a better insertion of the n-alkanes (longer retention times) while excluding the bulkier probes, such as cyclooctane or 2,2,4-trimethylpentane. Accordingly, the corresponding γsd values were larger and the IMχT values were lower (higher surface nanoroughness) for the sepiolites. Regarding Lewis acid-base properties, all the sample's surfaces evidenced a very strong amphoteric character. The present results highlight the potential of the evaluated samples for, e.g., adsorption processes with volatile organic compounds or matrix-filler interactions regarding the production of composite structures with Lewis acid-base matrices.
publishDate 2021
dc.date.none.fl_str_mv 2021-06-16
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/10316/105283
http://hdl.handle.net/10316/105283
https://doi.org/10.3390/nano11061579
url http://hdl.handle.net/10316/105283
https://doi.org/10.3390/nano11061579
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2079-4991
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
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
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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