Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent
Autor(a) principal: | |
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Data de Publicação: | 2016 |
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/1822/43675 |
Resumo: | This study investigates the functionalization of titanium dioxide nanoparticles on the surface of polymeric microcapsules as a mean to control the release of encapsulated citronella through solar radiation. This allows for the release of a mosquito repellent without human intervention, as the sunlight works as a release activator. The TiO2 nanoparticles were synthetized using a modified sol–gel and hydrothermal method, with a crystallite size of the order of 10 nm and a specific surface area >250 m2/g. Transmission electron microscopy observations enabled the confirmation of the mesoporous structure. The nitrogen doping effect and changes in pH (pH = 3, 6 and 9) of the precursor solution was studied from photocatalytic and photoluminescence experiments. Polyurethane microcapsules were prepared using a modified interfacial polymerization method. The surface topography ofthe microcapsules was observed with scanning electron microscopy, while the release efficiency was quantified using gas chromatography coupled with mass spectroscopy. In-vitro bioassays using live mosquitoes further attested the controlled release repellence effect of these photocatalytic microcapsules by inhibition of these vectors. The results showed that functionalizing the microcapsules with nanoparticles on their surface and then exposing them to ultraviolet radiation effectively increased the output of citronella into the air, repelling the mosquitoes |
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Microencapsulation of citronella oil for solar-activated controlled release as an insect repellentPhotocatalysisMicrocapsulesTiO2NanoparticlesControlled releaseMosquito repellentEngenharia e Tecnologia::Engenharia dos MateriaisScience & TechnologyThis study investigates the functionalization of titanium dioxide nanoparticles on the surface of polymeric microcapsules as a mean to control the release of encapsulated citronella through solar radiation. This allows for the release of a mosquito repellent without human intervention, as the sunlight works as a release activator. The TiO2 nanoparticles were synthetized using a modified sol–gel and hydrothermal method, with a crystallite size of the order of 10 nm and a specific surface area >250 m2/g. Transmission electron microscopy observations enabled the confirmation of the mesoporous structure. The nitrogen doping effect and changes in pH (pH = 3, 6 and 9) of the precursor solution was studied from photocatalytic and photoluminescence experiments. Polyurethane microcapsules were prepared using a modified interfacial polymerization method. The surface topography ofthe microcapsules was observed with scanning electron microscopy, while the release efficiency was quantified using gas chromatography coupled with mass spectroscopy. In-vitro bioassays using live mosquitoes further attested the controlled release repellence effect of these photocatalytic microcapsules by inhibition of these vectors. The results showed that functionalizing the microcapsules with nanoparticles on their surface and then exposing them to ultraviolet radiation effectively increased the output of citronella into the air, repelling the mosquitoesThis work was supported by FEDER through the COMPETE Program and by the Portuguese Foundation for Science and Technology (FCT) in the framework of the PTDC/CTM-NAN/119979/2010 project. Juliana Marques acknowledges the FCT supportfor her PhD grant SFRH/BD/112868/2015. The authors would like to acknowledge Dr C. Mateos-Pedrero for the BET surface area analysis.ElsevierUniversidade do MinhoRibeiro, António David MartinsMarques, Juliana Filipa GouveiaForte, Marta A. F.Correia, Filipe C.Parpot, PierOliveira, César João SantosPereira, Ana Isabel OliveiraAndrade, LuísaAzenha, CátiaMendes, AdélioAlves, Gonçalo M.Sousa, Carla A.Tavares, C. J.20162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/43675eng2352-940710.1016/j.apmt.2016.09.003info: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:RCAAP2023-07-21T12:48:39Zoai:repositorium.sdum.uminho.pt:1822/43675Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:46:57.024361Repositório 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 |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
title |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
spellingShingle |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent Ribeiro, António David Martins Photocatalysis Microcapsules TiO2 Nanoparticles Controlled release Mosquito repellent Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
title_short |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
title_full |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
title_fullStr |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
title_full_unstemmed |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
title_sort |
Microencapsulation of citronella oil for solar-activated controlled release as an insect repellent |
author |
Ribeiro, António David Martins |
author_facet |
Ribeiro, António David Martins Marques, Juliana Filipa Gouveia Forte, Marta A. F. Correia, Filipe C. Parpot, Pier Oliveira, César João Santos Pereira, Ana Isabel Oliveira Andrade, Luísa Azenha, Cátia Mendes, Adélio Alves, Gonçalo M. Sousa, Carla A. Tavares, C. J. |
author_role |
author |
author2 |
Marques, Juliana Filipa Gouveia Forte, Marta A. F. Correia, Filipe C. Parpot, Pier Oliveira, César João Santos Pereira, Ana Isabel Oliveira Andrade, Luísa Azenha, Cátia Mendes, Adélio Alves, Gonçalo M. Sousa, Carla A. Tavares, C. J. |
author2_role |
author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Ribeiro, António David Martins Marques, Juliana Filipa Gouveia Forte, Marta A. F. Correia, Filipe C. Parpot, Pier Oliveira, César João Santos Pereira, Ana Isabel Oliveira Andrade, Luísa Azenha, Cátia Mendes, Adélio Alves, Gonçalo M. Sousa, Carla A. Tavares, C. J. |
dc.subject.por.fl_str_mv |
Photocatalysis Microcapsules TiO2 Nanoparticles Controlled release Mosquito repellent Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
topic |
Photocatalysis Microcapsules TiO2 Nanoparticles Controlled release Mosquito repellent Engenharia e Tecnologia::Engenharia dos Materiais Science & Technology |
description |
This study investigates the functionalization of titanium dioxide nanoparticles on the surface of polymeric microcapsules as a mean to control the release of encapsulated citronella through solar radiation. This allows for the release of a mosquito repellent without human intervention, as the sunlight works as a release activator. The TiO2 nanoparticles were synthetized using a modified sol–gel and hydrothermal method, with a crystallite size of the order of 10 nm and a specific surface area >250 m2/g. Transmission electron microscopy observations enabled the confirmation of the mesoporous structure. The nitrogen doping effect and changes in pH (pH = 3, 6 and 9) of the precursor solution was studied from photocatalytic and photoluminescence experiments. Polyurethane microcapsules were prepared using a modified interfacial polymerization method. The surface topography ofthe microcapsules was observed with scanning electron microscopy, while the release efficiency was quantified using gas chromatography coupled with mass spectroscopy. In-vitro bioassays using live mosquitoes further attested the controlled release repellence effect of these photocatalytic microcapsules by inhibition of these vectors. The results showed that functionalizing the microcapsules with nanoparticles on their surface and then exposing them to ultraviolet radiation effectively increased the output of citronella into the air, repelling the mosquitoes |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 2016-01-01T00:00:00Z |
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/1822/43675 |
url |
http://hdl.handle.net/1822/43675 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2352-9407 10.1016/j.apmt.2016.09.003 |
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.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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 |
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RCAAP |
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RCAAP |
reponame_str |
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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1799133040958504960 |