Titanium dioxide for upconversion markers @ INCM

Detalhes bibliográficos
Autor(a) principal: Sousa, Bernardo Daniel Fevereiro e
Data de Publicação: 2021
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/129163
Resumo: The work achieved with this thesis consisted of the production and characterization of new low-cost upconversion nanoparticles based on a titanium dioxide (TiO2) host matrix. These nanoparticles were produced by solvothermal synthesis assisted by microwave irradiation. Two elements (europium and ytterbium) were used as dopant in the matrix to allow the upconversion process. Different parameters of synthesis were considered, to achieve an ideal process of synthesis. Also, different acids and solvents were considered and studied to achieve the most successful conditions. Three acids were tested: ( hydro-chloric acid (HCl), nitric acid (HNO3,), and oxalic acid (C2H2O4)). Besides acids, also 2 solvents were tested: ethanol (C2H6O) and water (H2O). The nanoparticles produced are going to be an essential part of a security marker ink to be used by INCM (Imprensa Nacional – Casa da Moeda). The goal of this thesis is to achieve the synthesis of nanoparticles to be mixed in an ink to be used as a low-cost security marker ink to replace the current ink used by INCM. According to studies realized on the different reagents, it was concluded that oxalic acid and ethanol produced particles with desired properties (good size uniformity, spherical particles, and small size) for the TiO2 matrix. The concentration of dopant was also considered and studied, in an initial test, 4 molar concentrations were considered: 2.5%; 5%; 7.5%; and 10%. The 7.5% concentration was decided due to particles size, shape, and uniformity. The upscaling of the process was successful, when converting 50ml solutions to 600 ml. The nanoparticles produced in both solutions presented similar properties when analyzed. The ink formulation was achieved with good results, the nanoparticles were easily mixed without the need to add dispersants. The detection of the dopant in the nanoparticles was successful in both powder and when mixed as ink.
id RCAP_be3515e19c6d0d8c6c4a2b2862b03645
oai_identifier_str oai:run.unl.pt:10362/129163
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Titanium dioxide for upconversion markers @ INCMUpconversionTiO2YtterbiumEuropiumNanoparticlesDomínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e TecnologiasDomínio/Área Científica::Engenharia e Tecnologia::NanotecnologiaThe work achieved with this thesis consisted of the production and characterization of new low-cost upconversion nanoparticles based on a titanium dioxide (TiO2) host matrix. These nanoparticles were produced by solvothermal synthesis assisted by microwave irradiation. Two elements (europium and ytterbium) were used as dopant in the matrix to allow the upconversion process. Different parameters of synthesis were considered, to achieve an ideal process of synthesis. Also, different acids and solvents were considered and studied to achieve the most successful conditions. Three acids were tested: ( hydro-chloric acid (HCl), nitric acid (HNO3,), and oxalic acid (C2H2O4)). Besides acids, also 2 solvents were tested: ethanol (C2H6O) and water (H2O). The nanoparticles produced are going to be an essential part of a security marker ink to be used by INCM (Imprensa Nacional – Casa da Moeda). The goal of this thesis is to achieve the synthesis of nanoparticles to be mixed in an ink to be used as a low-cost security marker ink to replace the current ink used by INCM. According to studies realized on the different reagents, it was concluded that oxalic acid and ethanol produced particles with desired properties (good size uniformity, spherical particles, and small size) for the TiO2 matrix. The concentration of dopant was also considered and studied, in an initial test, 4 molar concentrations were considered: 2.5%; 5%; 7.5%; and 10%. The 7.5% concentration was decided due to particles size, shape, and uniformity. The upscaling of the process was successful, when converting 50ml solutions to 600 ml. The nanoparticles produced in both solutions presented similar properties when analyzed. The ink formulation was achieved with good results, the nanoparticles were easily mixed without the need to add dispersants. The detection of the dopant in the nanoparticles was successful in both powder and when mixed as ink.O trabalho realizado por esta tese consistiu na produção e caracterização de nanopartículas de baixo custo baseadas numa matriz de dióxido de titânio (TiO2). Estas nanopartículas foram produzidas a partir de método solvo termal assistido por radiação micro-ondas. Dois elementos (európio e itérbio) foram utilizados como dopantes na matriz para permitir o processo de upconversion. Diferentes parâmetros de síntese foram considerados, para atingir um processo ideal de síntese. Diferentes ácidos e solvents foram considerados e estudados para analisar as condições com os resultados mais desejáveis. Três ácidos fo-ram testados: ácido clorídrico (HCl), ácido nítrico (HNO3,), e ácido oxálico (C2H2O4). Os solventes testados foram etanol (C2H6O) e água (H2O). As nanopartículas produzidas vão ser uma parte essencial de uma tinta de segurança a ser usada pela INCM (Imprensa Nacional – Casa da Moeda). O objetivo desta tese é conseguir produzir as nanopartículas, e a sua mistura numa tinta para ter a função de tinta de segurança de baixo custo para trocar a tinta atualmente utilizada. De acordo com estudos realizados nos diversos reagentes, ficou concluído que ácido oxálico e etanol obtiveram as partículas com as propriedades mais desejáveis (tamanho uniforme, nanopartículas esféricas, e tamanho pequeno) para a matriz de TiO2. A concentração de dopante foi também considerada e estudada num teste inicial, quatro concentrações molares foram consideradas: 2.5%, 5.0%, 7.5%, e 10.0%. A 7.5% foi considerada a concentração desejável devido ao tamanho, formato e uniformidade. O pro-cesso em larga-escala foi conseguido, ao converter soluções de 50ml para 600ml. As nanopartículas apresentaram nos dois processos, características semelhantes. A formulação da tinta foi alcançada com sucesso, houve uma boa mistura entre a tinta e as nanopartículas, não se registou sedimentação, e não houve necessidade de adicionar dispersantes. A deteção do dopante nas nanopartículas foi bem sucedida, em pó e também depois da mistura com a tinta.Gomes, DanielaAraújo, AndreiaRUNSousa, Bernardo Daniel Fevereiro e2022-02-15T01:30:49Z2021-11-162021-11-16T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/129163enginfo: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:RCAAP2024-03-11T05:08:20Zoai:run.unl.pt:10362/129163Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:46:27.853355Repositório 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 Titanium dioxide for upconversion markers @ INCM
title Titanium dioxide for upconversion markers @ INCM
spellingShingle Titanium dioxide for upconversion markers @ INCM
Sousa, Bernardo Daniel Fevereiro e
Upconversion
TiO2
Ytterbium
Europium
Nanoparticles
Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias
Domínio/Área Científica::Engenharia e Tecnologia::Nanotecnologia
title_short Titanium dioxide for upconversion markers @ INCM
title_full Titanium dioxide for upconversion markers @ INCM
title_fullStr Titanium dioxide for upconversion markers @ INCM
title_full_unstemmed Titanium dioxide for upconversion markers @ INCM
title_sort Titanium dioxide for upconversion markers @ INCM
author Sousa, Bernardo Daniel Fevereiro e
author_facet Sousa, Bernardo Daniel Fevereiro e
author_role author
dc.contributor.none.fl_str_mv Gomes, Daniela
Araújo, Andreia
RUN
dc.contributor.author.fl_str_mv Sousa, Bernardo Daniel Fevereiro e
dc.subject.por.fl_str_mv Upconversion
TiO2
Ytterbium
Europium
Nanoparticles
Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias
Domínio/Área Científica::Engenharia e Tecnologia::Nanotecnologia
topic Upconversion
TiO2
Ytterbium
Europium
Nanoparticles
Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias
Domínio/Área Científica::Engenharia e Tecnologia::Nanotecnologia
description The work achieved with this thesis consisted of the production and characterization of new low-cost upconversion nanoparticles based on a titanium dioxide (TiO2) host matrix. These nanoparticles were produced by solvothermal synthesis assisted by microwave irradiation. Two elements (europium and ytterbium) were used as dopant in the matrix to allow the upconversion process. Different parameters of synthesis were considered, to achieve an ideal process of synthesis. Also, different acids and solvents were considered and studied to achieve the most successful conditions. Three acids were tested: ( hydro-chloric acid (HCl), nitric acid (HNO3,), and oxalic acid (C2H2O4)). Besides acids, also 2 solvents were tested: ethanol (C2H6O) and water (H2O). The nanoparticles produced are going to be an essential part of a security marker ink to be used by INCM (Imprensa Nacional – Casa da Moeda). The goal of this thesis is to achieve the synthesis of nanoparticles to be mixed in an ink to be used as a low-cost security marker ink to replace the current ink used by INCM. According to studies realized on the different reagents, it was concluded that oxalic acid and ethanol produced particles with desired properties (good size uniformity, spherical particles, and small size) for the TiO2 matrix. The concentration of dopant was also considered and studied, in an initial test, 4 molar concentrations were considered: 2.5%; 5%; 7.5%; and 10%. The 7.5% concentration was decided due to particles size, shape, and uniformity. The upscaling of the process was successful, when converting 50ml solutions to 600 ml. The nanoparticles produced in both solutions presented similar properties when analyzed. The ink formulation was achieved with good results, the nanoparticles were easily mixed without the need to add dispersants. The detection of the dopant in the nanoparticles was successful in both powder and when mixed as ink.
publishDate 2021
dc.date.none.fl_str_mv 2021-11-16
2021-11-16T00:00:00Z
2022-02-15T01:30:49Z
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/10362/129163
url http://hdl.handle.net/10362/129163
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
_version_ 1799138068380254208