Título: | SYNTHESIS AND CHARACTERIZATION OF FLUORESCENT SILICA NANOPARTICLES WITH POTENTIAL APPLICATION IN TRANSPORT AND ADSORPTION STUDIES IN POROUS MEDIUM | ||||||||||||
Autor: |
ALESSANDRA PAZINI |
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Colaborador(es): |
AURORA PEREZ GRAMATGES - Orientador LUIS MAQUEIRA ESPINOSA - Coorientador |
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Catalogação: | 31/AGO/2023 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=63881&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=63881&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.63881 | ||||||||||||
Resumo: | |||||||||||||
Silica nanoparticles (SiNPs) are widely used in various fields, and they form
nanofluids with exceptional properties when they are suspended in a base fluid.
However, the transport and quantification of SiNPs in porous media pose
significant challenges. To address this, fluorescence spectroscopy is a promising
technique for this task. In this study, a series of core-shell silica-based fluorescent
nanoparticles (FSiNPs) with similar cores but different surface groups were
synthesized using the Stober and WORM synthesis methods. These hybrid FSiNPs
were designed and presented the same colloidal behavior as commercial SiNPs
widely applied in the form of nanofluids. The presence of primary amino groups
was confirmed in positive-FSiNPs, and a posterior characterization supported the
presence of organic matter in nanoparticles confirming the insertion of fluorescent
molecules in all FSiNPs. Comparative analyses revealed that the WORM method
produced more homogeneous nanoparticles with consistent form and size
distribution. The N2 adsorption/desorption analysis demonstrated similarities
between the synthesized FSiNPs and commercial SiNPs, validating their suitability
for transport experiments focusing on colloidal behavior. Both WORM-FSiNPs
were successfully quantified in the effluent after flowing through the glass bead
column. The SiNP-containing aminopropyl surface groups showed the greatest
stability and lowest adsorption compared with those grafted with silanol groups. It
was attributed to the effect of stronger attractive interactions between the NPs and
anionic surfactant molecules. The potential of these fluorescent NPs as sensitive
tracers for transport and adsorption studies in nanofluids containing surfactants was
demonstrated.
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