Thermal properties of nanofluids using hydrophilic and hydrophobic LiYF4:Yb/Er upconverting nanoparticles

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversity of Aveiro-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Federal de Pernambuco (UFPE)-
Autor(es): dc.creatorGonçalves, João M.-
Autor(es): dc.creatorBastos, Ana R. N.-
Autor(es): dc.creatorRibeiro, Sidney J. L.-
Autor(es): dc.creatorCarlos, L. D.-
Autor(es): dc.creatorLongo, Ricardo L.-
Autor(es): dc.creatorCaiut, José Maurício A.-
Autor(es): dc.creatorFerreira, Rute A. S.-
Data de aceite: dc.date.accessioned2025-08-21T17:43:52Z-
Data de disponibilização: dc.date.available2025-08-21T17:43:52Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-02-13-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1039/d3na01114c-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/299198-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/299198-
Descrição: dc.descriptionLuminescent nanoparticles have shown great potential for thermal sensing in bio-applications. Nonetheless, these materials lack water dispersibility that can be overcome by modifying their surface properties with water dispersible molecules such as cysteine. Herein, we employ LiYF4:Er3+/Yb3+ upconverting nanoparticles (UCNPs) capped with oleate or modified with cysteine dispersed in cyclohexane or in water, respectively, as thermal probes. Upconversion emission was used to sense temperature with a relative thermal sensitivity of ∼1.24% K−1 (at 300 K) and a temperature uncertainty of 0.8 K for the oleate capped and of 0.5 K for cysteine modified NPs. To study the effect of the cysteine modification in the heat transfer processes, the thermal conductivity of the nanofluids was determined, yielding 0.123(6) W m−1 K−1 for the oleate capped UCNPs dispersed in cyclohexane and 0.50(7) W m−1 K−1 for the cysteine modified UCNPs dispersed in water. Moreover, through the heating curves, the nanofluids' thermal resistances were estimated, showing that the cysteine modification partially prevents heat transfer.-
Descrição: dc.descriptionDepartment of Physics CICECO - Aveiro Institute of Materials University of Aveiro-
Descrição: dc.descriptionDepartment of Chemistry Faculdade de Filosofia Ciências e Letras University of São Paulo-
Descrição: dc.descriptionInstitute of Chemistry Universidade Estadual Paulista Júlio de Mesquisa Filho-
Descrição: dc.descriptionDepartamento de Química Fundamental Universidade Federal de Pernambuco, PE-
Descrição: dc.descriptionInstitute of Chemistry Universidade Estadual Paulista Júlio de Mesquisa Filho-
Formato: dc.format1486-1496-
Idioma: dc.languageen-
Relação: dc.relationNanoscale Advances-
???dc.source???: dc.sourceScopus-
Título: dc.titleThermal properties of nanofluids using hydrophilic and hydrophobic LiYF4:Yb/Er upconverting nanoparticles-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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