Título: | SYNTHESIS OF CDTE AND AG NANOPARTICLES IN MICROFLUIDIC SYSTEMS AIMING A QUALITATIVE STUDY OF INTERACTION IN FLOW AND THE PREPARATION OF THIN FILMS OF THESE NANOMATERIALS | ||||||||||||
Autor: |
LEONARDO MELO DE LIMA |
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Colaborador(es): |
OMAR PANDOLI - Orientador |
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Catalogação: | 26/ABR/2018 | Língua(s): | PORTUGUESE - BRAZIL |
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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=33714&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=33714&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.33714 | ||||||||||||
Resumo: | |||||||||||||
Nanostructured materials such as cadmium telluride semiconductor nanocrystals (QDs-CdTe) and silver nanoparticles (NPsAg) have been used as analytical nanoprobes, exploiting their luminescence properties and localized plasmonic surface resonance (LSPR), respectively, both in colloidal suspension or on thin solid films. Due to their experimental set-up, microfluidic systems can be used, both, for synthesis of nanostructured materials and for the analytic detection of biological and pharmaceutical compounds. In the present study, thioglycolic acid (TGA) coated QDs-CdTe were synthesized in batch and in a continuous flow regime from the injection of cadmium and tellurium precursors by syringe pumps into a steel tubes through horizontal tubular furnaces with temperature controllers (110 - 140 Celsius degrees). To optimize the experimental conditions, we modulate the volumetric flow rate (0.15 - 0.03 mL min(-1)) and the Cd:Te molar ratio (1:0.3 - 1:1.5). The results showed that the effect of the molar ratio on the synthesis of QDs was more significant compared to the temperature variation, obtaining QDs with FWHM of 64 - 86 nm. Polimeric luminescent films with PDMS e PVA were developed with impregnation, mixing QDs-TGA in PDMS
and PVA and spin coating techniques. By the spin coating technique we produced luminescent film of 58.7 nm thickness. QDs-TGA film on glass substrate were obtained by means of surface silanization.All the film showed luminescence instability over time. Colloidal dispersions of NPsAg coated with the organic
citrate and tartrate ligands in the Ag+/ligand ratios (1:1 and 1:0.5) were synthesized from the injection of organic ligands and silver nitrate by syringe pumps into a polymeric tubular micro-reactor. NPsAg-citrate and NPsAg-tartrate presented negative surface charges and average sizes of 12.5. The SPR band was monitored to follow the interation between the silver nanoprobe with kanamycin and neomycin drugs by means of a flow cell coupled to a photometry. At concentrations equal or greater than 2 × 10(-7) mol L(-1) the LSPR band changed its spectral profile. LSPR maximum band, centered at 404 nm, decaied and appeared a new band at 480 nm resulting from the agglomeration of the nanoparticles. Moreover, in a partnership with the Federal University of Pernambuco (UFPE), NPsAg-tartarate were deposited on glass for the realization of thin film with the object to development a biosensor based on localized plasmon resonance (LSPR) for determination of Candida albicans antigen.
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