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Abstract:

Robust and highly transparent quasi amorphous ZrO2-water-glycerol hydrogels were obtained in a mild one pot procedure, based on the 2,3-epoxy-1-propanol driven alkalinization. SAXS-based characterization of the sol-gel transition revealed that an homogeneously nucleated sol composed of 2 nm primary particles continuously grows up to a critical size of 5-6 nm, when gelation takes place. These particles reach a size of 8-10 nm, depending on the Zr(iv) concentration. Conductivity measurements offer an overall in situ assessment of the reaction rate. The gelled samples share a common trend: once the conductivity decays to 40% of the starting value, the primary particles nucleate and when this decay reaches 20%, the sol-gel transition takes place. The mild conditions employed herein prevent massive ripening and recrystallization leaving hydrogels with extremely low undesired visible light scattering. This suitable nanostructure was achieved in a wide range of total Zr(iv) concentrations or water to glycerol ratios. © 2016 The Royal Society of Chemistry.

Registro:

Documento: Artículo
Título:Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
Autor:Oestreicher, V.; Perullini, M.; Jobbágy, M.
Filiación:INQUIMAE, DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Pabellón II, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Centro Interdisciplinario de NanoCiencia y NanoTecnología, Argentina
Palabras clave:Gelation; Glycerol; Light scattering; Sol-gel process; Sol-gels; Zirconium alloys; Conductivity measurements; Critical size; Hydrogel formation; In-situ assessment; One-pot procedures; Physicochemical aspects; Primary particles; Sol-gel transitions; Hydrogels
Año:2016
Volumen:45
Número:24
Página de inicio:9920
Página de fin:9924
DOI: http://dx.doi.org/10.1039/c6dt00323k
Título revista:Dalton Transactions
Título revista abreviado:Dalton Trans.
ISSN:14779226
CODEN:DTARA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14779226_v45_n24_p9920_Oestreicher

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Citas:

---------- APA ----------
Oestreicher, V., Perullini, M. & Jobbágy, M. (2016) . Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties. Dalton Transactions, 45(24), 9920-9924.
http://dx.doi.org/10.1039/c6dt00323k
---------- CHICAGO ----------
Oestreicher, V., Perullini, M., Jobbágy, M. "Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties" . Dalton Transactions 45, no. 24 (2016) : 9920-9924.
http://dx.doi.org/10.1039/c6dt00323k
---------- MLA ----------
Oestreicher, V., Perullini, M., Jobbágy, M. "Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties" . Dalton Transactions, vol. 45, no. 24, 2016, pp. 9920-9924.
http://dx.doi.org/10.1039/c6dt00323k
---------- VANCOUVER ----------
Oestreicher, V., Perullini, M., Jobbágy, M. Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties. Dalton Trans. 2016;45(24):9920-9924.
http://dx.doi.org/10.1039/c6dt00323k