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Zirconia-based Aerogels via Hydrolysis of Salts and Alkoxides: The Influence of the Synthesis Procedures on the Properties of the Aerogels

Schäfer, Helmut and Brandt, Susanne and Milow , Barbara and Ichilmann, Sachar and Steinhart, Martin and Ratke, Lorenz (2013) Zirconia-based Aerogels via Hydrolysis of Salts and Alkoxides: The Influence of the Synthesis Procedures on the Properties of the Aerogels. Chemistry - An Asian Journal. Wiley. doi: 10.1002/asia.201300488. ISSN 1861-4728.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/asia.201300488/abstract

Abstract

This contribution aims at evaluating different synthesis procedures leading to zirconia-based aerogels. A series of undoped and yttrium-doped zirconia aerogels have been prepared via hydrolysis and condensation reaction of different alkoxy- and different inorganic salt-based precursors followed by supercritical drying. Well-established but deleterious zirconium n-propoxide (TPOZ) or zirconium n-butoxide (TBOZ) were used as metal precursors in combination with acids like nitric acid and acetic acid as auxiliary agent for the generation of non-yttrium stabilized zirconia aerogels. Yttrium-stabilized zirconia aerogels as well as pure zirconia aerogels were obtained by the salt route starting from ZrCl4 and crosslinking agents like propylene oxide or acetylacetone. The characteristics of the products were analyzed by nitrogen adsorption measurements, electron microscopy, and X-ray scattering. It turned out that with respect to all relevant properties of the aerogels as well as the practicability of the synthesis procedures, approaches based on inexpensive non-toxic salt precursors are the methods of choice. The salt-based approaches allow not only for low-cost, easy-to-handle synthesis procedures with realizable gelation times of less than 60 seconds, but also delivered the products with the highest surface area (449 m2 g−1 for ZrCl4) within this series of syntheses.

Item URL in elib:https://elib.dlr.de/83127/
Document Type:Article
Title:Zirconia-based Aerogels via Hydrolysis of Salts and Alkoxides: The Influence of the Synthesis Procedures on the Properties of the Aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schäfer, Helmuthelmut.schaefer (at) uos.deUNSPECIFIED
Brandt, SusanneUNSPECIFIEDUNSPECIFIED
Milow , BarbaraBarbara.Milow (at) dlr.deUNSPECIFIED
Ichilmann, SacharUNSPECIFIEDUNSPECIFIED
Steinhart, MartinUNSPECIFIEDUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Date:25 June 2013
Journal or Publication Title:Chemistry - An Asian Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/asia.201300488
Editors:
EditorsEmailEditor's ORCID iD
Kueckmann, TheresaUNSPECIFIEDUNSPECIFIED
Publisher:Wiley
ISSN:1861-4728
Status:Published
Keywords:aerogels; mesoporous materials; microporous materials; sol–gel processes; zirconia
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Projekt Neuartige Fahrzeugstrukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Milow, Dr. Barbara
Deposited On:01 Jul 2013 08:36
Last Modified:08 Mar 2018 18:30

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