Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties

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...

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Autores principales: Oestreicher, V., Perullini, M., Jobbágy, M.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14779226_v45_n24_p9920_Oestreicher
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14779226_v45_n24_p9920_Oestreicher
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spelling todo:paper_14779226_v45_n24_p9920_Oestreicher2023-10-03T16:19:18Z Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties Oestreicher, V. Perullini, M. Jobbágy, M. 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 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. Fil:Oestreicher, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Perullini, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14779226_v45_n24_p9920_Oestreicher
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Oestreicher, V.
Perullini, M.
Jobbágy, M.
Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
topic_facet 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
description 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.
format JOUR
author Oestreicher, V.
Perullini, M.
Jobbágy, M.
author_facet Oestreicher, V.
Perullini, M.
Jobbágy, M.
author_sort Oestreicher, V.
title Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
title_short Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
title_full Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
title_fullStr Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
title_full_unstemmed Physicochemical aspects of epoxide driven nano-ZrO2 hydrogel formation: Milder kinetics for better properties
title_sort physicochemical aspects of epoxide driven nano-zro2 hydrogel formation: milder kinetics for better properties
url http://hdl.handle.net/20.500.12110/paper_14779226_v45_n24_p9920_Oestreicher
work_keys_str_mv AT oestreicherv physicochemicalaspectsofepoxidedrivennanozro2hydrogelformationmilderkineticsforbetterproperties
AT perullinim physicochemicalaspectsofepoxidedrivennanozro2hydrogelformationmilderkineticsforbetterproperties
AT jobbagym physicochemicalaspectsofepoxidedrivennanozro2hydrogelformationmilderkineticsforbetterproperties
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