Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels

This work is a new approach to the study of the structural, mechanical and absorption properties of hybrid organic/inorganic silica-based aerogels. Diethoxydimethylsilane and tetraethoxysilane have been used as precursors. Changes in properties such as specific surface area, porous volume, pore radi...

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Autores: Morales Flórez, Víctor, Piñero de los Ríos, Manuel, Braza, Verónica, Mesa Díaz, María del Mar, Esquivias Fedriani, Luis María, Rosa Fox, Nicolás de la
Formato: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2017
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/94643
Acesso em linha:https://hdl.handle.net/11441/94643
https://doi.org/10.1007/s10971-016-4203-0
Access Level:acceso abierto
Palavra-chave:Absorption capacity
DEDMS–TEOS
Hybrid aerogel materials
Nanostructure
Swelling
Uniaxial compression
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spelling Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogelsMorales Flórez, VíctorPiñero de los Ríos, ManuelBraza, VerónicaMesa Díaz, María del MarEsquivias Fedriani, Luis MaríaRosa Fox, Nicolás de laAbsorption capacityDEDMS–TEOSHybrid aerogel materialsNanostructureSwellingUniaxial compressionThis work is a new approach to the study of the structural, mechanical and absorption properties of hybrid organic/inorganic silica-based aerogels. Diethoxydimethylsilane and tetraethoxysilane have been used as precursors. Changes in properties such as specific surface area, porous volume, pore radius, and surface texture and chemistry were researched as a function of the relative organic content. In addition, the absorption properties were tested for different organic liquids. The discrepancy in the absorption mechanisms and the kinetics of pure inorganic and hybrid samples were discussed. It was confirmed that swelling occurs in samples with high organic content, which, in turn, governs the absorption process. Finally, the mechanical behaviour was studied by uniaxial compression. A significant rise of the rupture strain up to 0.45 and a 10-fold decrease in the Young’s modulus to 7.8 MPa were measured in the dry samples by increasing the organic content. The mechanical response of the samples after saturation by the absorption of two reference oily liquids, namely, common motor oil and liquid polydimethylsiloxane, was also compared with the behaviour of dry samples. The presence of liquid within the sample reduced the value of the mechanical parameters in almost all cases. Moreover, the inclusion of organic chains also made the wet aerogels highly deformable. In summary, these first results suggest that tuning the organic ratio of the hybrid aerogels allows the control of not only the structural and mechanical properties but also the absorption properties.Junta de Andalucía P09-TEP-5463Springer NatureFísica de la Materia Condensada2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/94643https://doi.org/10.1007/s10971-016-4203-0reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésJournal of Sol-Gel Science and Technology, 81 (2), 600-610.P09-TEP-5463http://dx.doi.org/10.1007/s10971-016-4203-0info:eu-repo/semantics/openAccessoai:idus.us.es:11441/946432026-06-17T12:51:07Z
dc.title.none.fl_str_mv Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
title Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
spellingShingle Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
Morales Flórez, Víctor
Absorption capacity
DEDMS–TEOS
Hybrid aerogel materials
Nanostructure
Swelling
Uniaxial compression
title_short Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
title_full Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
title_fullStr Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
title_full_unstemmed Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
title_sort Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels
dc.creator.none.fl_str_mv Morales Flórez, Víctor
Piñero de los Ríos, Manuel
Braza, Verónica
Mesa Díaz, María del Mar
Esquivias Fedriani, Luis María
Rosa Fox, Nicolás de la
author Morales Flórez, Víctor
author_facet Morales Flórez, Víctor
Piñero de los Ríos, Manuel
Braza, Verónica
Mesa Díaz, María del Mar
Esquivias Fedriani, Luis María
Rosa Fox, Nicolás de la
author_role author
author2 Piñero de los Ríos, Manuel
Braza, Verónica
Mesa Díaz, María del Mar
Esquivias Fedriani, Luis María
Rosa Fox, Nicolás de la
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Física de la Materia Condensada
dc.subject.none.fl_str_mv Absorption capacity
DEDMS–TEOS
Hybrid aerogel materials
Nanostructure
Swelling
Uniaxial compression
topic Absorption capacity
DEDMS–TEOS
Hybrid aerogel materials
Nanostructure
Swelling
Uniaxial compression
description This work is a new approach to the study of the structural, mechanical and absorption properties of hybrid organic/inorganic silica-based aerogels. Diethoxydimethylsilane and tetraethoxysilane have been used as precursors. Changes in properties such as specific surface area, porous volume, pore radius, and surface texture and chemistry were researched as a function of the relative organic content. In addition, the absorption properties were tested for different organic liquids. The discrepancy in the absorption mechanisms and the kinetics of pure inorganic and hybrid samples were discussed. It was confirmed that swelling occurs in samples with high organic content, which, in turn, governs the absorption process. Finally, the mechanical behaviour was studied by uniaxial compression. A significant rise of the rupture strain up to 0.45 and a 10-fold decrease in the Young’s modulus to 7.8 MPa were measured in the dry samples by increasing the organic content. The mechanical response of the samples after saturation by the absorption of two reference oily liquids, namely, common motor oil and liquid polydimethylsiloxane, was also compared with the behaviour of dry samples. The presence of liquid within the sample reduced the value of the mechanical parameters in almost all cases. Moreover, the inclusion of organic chains also made the wet aerogels highly deformable. In summary, these first results suggest that tuning the organic ratio of the hybrid aerogels allows the control of not only the structural and mechanical properties but also the absorption properties.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/94643
https://doi.org/10.1007/s10971-016-4203-0
url https://hdl.handle.net/11441/94643
https://doi.org/10.1007/s10971-016-4203-0
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Sol-Gel Science and Technology, 81 (2), 600-610.
P09-TEP-5463
http://dx.doi.org/10.1007/s10971-016-4203-0
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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