Dielectric study of triton X100: a glass-forming liquid

Detalhes bibliográficos
Autor(a) principal: Merino, Esther Garcia
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/7698
Resumo: Dissertação para obtenção do grau de mestre em Engenharia de Materiais
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spelling Dielectric study of triton X100: a glass-forming liquidDielectric spectroscopyTriton X100CrystallizationGlass transitionConfinementDissertação para obtenção do grau de mestre em Engenharia de MateriaisThe main purpose of this work was to realize an exhaustive study on the molecular mobility of a glass-forming liquid and evaluate the influence of thermal treatment in the phase transformations undergone by the material. It was also our goal to investigate it response when subjected to confinement in nano-porous inorganic materials. The liquid selected, Triton X100, is characterized by a high dielectric response and a high tendency to crystallize by coming from both molten and glassy states. However, it is possible to find the conditions under which crystallization is avoided and the material enters in the supercooled liquid state. This allowed us to study the molecular mobility in the liquid, supercooled liquid, glassy states and as well as the crystallization and investigate temperature driven phase transformations. To get a further insight in the crystallization behaviour, isothermal crystallization at different temperatures and from both glassy and molten states was promoted and monitored in real-time by Dielectric Spectroscopy Relaxation. This study gave information about the influence of the crystallization on the remaining amorphous phase. Motivated by the recent knowledge that molecular mobility and phases transformations can be significantly altered when a glass-forming liquid is confined in the nanometer scale, the molecular dynamics of the Triton X100 was evaluated when confined in mesoporous materials (SBA-15 and MCM-41; pore size, respectively, 5.7 and 3.4 nm). This study revealed that the confinement in SBA-15 is an effective strategy to avoid the crystallization of the Triton X100 independently of the thermal history. Dielectric Spectroscopy Relaxation (DRS) was the main technique used to obtain detailed information about the molecular mobility in a wide range of frequencies (10-2 – 106 Hz). As complementary techniques Differential Scanning Calorimetric (DSC) and polarized Optical Microscopy (POM) were used. Some of the results have been published in the Journal of Physical Chemistry B 2011, 115, (43), 12336-12347.Faculdade de Ciências e TecnologiaCorreia, NataliaDionisio, MadalenaRUNMerino, Esther Garcia2012-08-03T10:34:09Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/7698enginfo: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:RCAAP2024-03-11T03:39:48Zoai:run.unl.pt:10362/7698Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:17:39.856790Repositório 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 Dielectric study of triton X100: a glass-forming liquid
title Dielectric study of triton X100: a glass-forming liquid
spellingShingle Dielectric study of triton X100: a glass-forming liquid
Merino, Esther Garcia
Dielectric spectroscopy
Triton X100
Crystallization
Glass transition
Confinement
title_short Dielectric study of triton X100: a glass-forming liquid
title_full Dielectric study of triton X100: a glass-forming liquid
title_fullStr Dielectric study of triton X100: a glass-forming liquid
title_full_unstemmed Dielectric study of triton X100: a glass-forming liquid
title_sort Dielectric study of triton X100: a glass-forming liquid
author Merino, Esther Garcia
author_facet Merino, Esther Garcia
author_role author
dc.contributor.none.fl_str_mv Correia, Natalia
Dionisio, Madalena
RUN
dc.contributor.author.fl_str_mv Merino, Esther Garcia
dc.subject.por.fl_str_mv Dielectric spectroscopy
Triton X100
Crystallization
Glass transition
Confinement
topic Dielectric spectroscopy
Triton X100
Crystallization
Glass transition
Confinement
description Dissertação para obtenção do grau de mestre em Engenharia de Materiais
publishDate 2012
dc.date.none.fl_str_mv 2012-08-03T10:34:09Z
2012
2012-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/7698
url http://hdl.handle.net/10362/7698
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.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
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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