Production and optimization of hybrid fibrillary gels by colloidal electrospinning
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/21758 |
Resumo: | Electrospinning technique has proven to be a suitable approach to produce high surface area to volume ratio polymeric membranes with tailored architecture. To increase its functionality, a straightforward strategy can be the confinement of externally stimuli responsive systems, such as microgels. This combination enables the production of multifunctional composite systems. This thesis reports the development of composite fibres through colloidal electrospinning constituted by polyvinylpyrrolidone (PVP) containing poly(N-isopropylacrylamide) (PNIPAAm) microgels. The focus of the dissertation deals with the optimization of the fibre precursor, PVP. In the first stage, an extensive study towards the production of PVP non-woven mats with high surface area to volume ratio was performed. The obtained non-woven mats were crosslinked using UV irradiation, a green and cost-effective technique, to ensure structure stability in the presence of a solvent (prevent dissolution). Non-woven mats were further characterized in terms of morphological, mechanical and swelling properties. In addition, the fibre precursor, PVP, was analysed through a process-dependent comparative study: non-woven mats vs. films. The most suitable electrospinning parameters were further used to confine PNIPAAm thermoresponsive microgels in PVP fibres through colloidal electrospinning. The system was further crosslinked and fully characterized to obtain a multiresponsive composite system. This versatile approach is a starting point to design and produce composite multifunctional systems that could be tailored for a wide range of applications. |
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Production and optimization of hybrid fibrillary gels by colloidal electrospinningPVPPNIPAAmCompositesMicrogelsColloidal electrospinningFibersDomínio/Área Científica::Engenharia e Tecnologia::Engenharia dos MateriaisElectrospinning technique has proven to be a suitable approach to produce high surface area to volume ratio polymeric membranes with tailored architecture. To increase its functionality, a straightforward strategy can be the confinement of externally stimuli responsive systems, such as microgels. This combination enables the production of multifunctional composite systems. This thesis reports the development of composite fibres through colloidal electrospinning constituted by polyvinylpyrrolidone (PVP) containing poly(N-isopropylacrylamide) (PNIPAAm) microgels. The focus of the dissertation deals with the optimization of the fibre precursor, PVP. In the first stage, an extensive study towards the production of PVP non-woven mats with high surface area to volume ratio was performed. The obtained non-woven mats were crosslinked using UV irradiation, a green and cost-effective technique, to ensure structure stability in the presence of a solvent (prevent dissolution). Non-woven mats were further characterized in terms of morphological, mechanical and swelling properties. In addition, the fibre precursor, PVP, was analysed through a process-dependent comparative study: non-woven mats vs. films. The most suitable electrospinning parameters were further used to confine PNIPAAm thermoresponsive microgels in PVP fibres through colloidal electrospinning. The system was further crosslinked and fully characterized to obtain a multiresponsive composite system. This versatile approach is a starting point to design and produce composite multifunctional systems that could be tailored for a wide range of applications.Zabala, CoroSoares, PaulaRUNFaria, Jaime Moreira Machado2017-06-28T12:05:47Z2016-102017-062016-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/21758enginfo: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:RCAAP2024-03-11T04:08:23Zoai:run.unl.pt:10362/21758Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:26:52.112165Repositório 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 |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
title |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
spellingShingle |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning Faria, Jaime Moreira Machado PVP PNIPAAm Composites Microgels Colloidal electrospinning Fibers Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
title_short |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
title_full |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
title_fullStr |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
title_full_unstemmed |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
title_sort |
Production and optimization of hybrid fibrillary gels by colloidal electrospinning |
author |
Faria, Jaime Moreira Machado |
author_facet |
Faria, Jaime Moreira Machado |
author_role |
author |
dc.contributor.none.fl_str_mv |
Zabala, Coro Soares, Paula RUN |
dc.contributor.author.fl_str_mv |
Faria, Jaime Moreira Machado |
dc.subject.por.fl_str_mv |
PVP PNIPAAm Composites Microgels Colloidal electrospinning Fibers Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
topic |
PVP PNIPAAm Composites Microgels Colloidal electrospinning Fibers Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
description |
Electrospinning technique has proven to be a suitable approach to produce high surface area to volume ratio polymeric membranes with tailored architecture. To increase its functionality, a straightforward strategy can be the confinement of externally stimuli responsive systems, such as microgels. This combination enables the production of multifunctional composite systems. This thesis reports the development of composite fibres through colloidal electrospinning constituted by polyvinylpyrrolidone (PVP) containing poly(N-isopropylacrylamide) (PNIPAAm) microgels. The focus of the dissertation deals with the optimization of the fibre precursor, PVP. In the first stage, an extensive study towards the production of PVP non-woven mats with high surface area to volume ratio was performed. The obtained non-woven mats were crosslinked using UV irradiation, a green and cost-effective technique, to ensure structure stability in the presence of a solvent (prevent dissolution). Non-woven mats were further characterized in terms of morphological, mechanical and swelling properties. In addition, the fibre precursor, PVP, was analysed through a process-dependent comparative study: non-woven mats vs. films. The most suitable electrospinning parameters were further used to confine PNIPAAm thermoresponsive microgels in PVP fibres through colloidal electrospinning. The system was further crosslinked and fully characterized to obtain a multiresponsive composite system. This versatile approach is a starting point to design and produce composite multifunctional systems that could be tailored for a wide range of applications. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-10 2016-10-01T00:00:00Z 2017-06-28T12:05:47Z 2017-06 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/21758 |
url |
http://hdl.handle.net/10362/21758 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
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 |
repository.mail.fl_str_mv |
|
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1799137898266624000 |