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Synthesis of inorganic aerogels via rapid gelation using chloride precursors

Schäfer, Helmut and Ratke, Lorenz and Milow , Barbara (2013) Synthesis of inorganic aerogels via rapid gelation using chloride precursors. RSC Advances. Royal Society of Chemistry. DOI: 10.1039/C3RA41688G ISSN 2046-2069

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Official URL: http://pubs.rsc.org/en/content/articlelanding/2013/RA/C3RA41688G

Abstract

This paper describes the synthesis of silica, titania, zirconia and mixed-metal-oxide aerogels by a new facile ap-proach. The corresponding low cost and non-toxic chlorides instead of the well established but more expensive and deleterious alkoxyprecursors were used as starting materials. Hydrolysis of the precursors led to wet gels. The strong exothermic reaction in case of TiCl4 or SiCl4 as gelprecursor can be controlled by both cooling and immersing the needle of the syringe in the aqueous solution. Under optimal conditions a rapid formation of sil-ica- and zirconia based hydrogels could be achieved even without additional amounts of an auxiliary agent. It is shown that in all other cases the hydrolysis reaction and gel formation can be controlled by adding agents with crosslinking properties like propylene oxide, dilution with alcohols or starting from water glass. Water glass not only has the function of a cheap network former but also allows the strict adjustment of the pH value via the neu-tralization of the acid forming hydrolysis reactions. Supercritical drying of the wet alkogel in CO2 delivered aerogels with BET surfaces up to 1390 m2/g as determined by nitrogen adsorption measurements. In addition, the characterization includes XRD and SEM. These findings provide new physical insights into the hydrolysis of the gelprecursors and lead to a significant reduction in production costs of inorganic aerogels

Item URL in elib:https://elib.dlr.de/83128/
Document Type:Article
Title:Synthesis of inorganic aerogels via rapid gelation using chloride precursors
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schäfer, Helmuthelmut.schaefer (at) uni-osnabrueck.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Milow , BarbaraBarbara.Milow (at) dlr.deUNSPECIFIED
Date:12 June 2013
Journal or Publication Title:RSC Advances
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1039/C3RA41688G
Editors:
EditorsEmail
Ruthven, SarahUNSPECIFIED
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Status:Published
Keywords:The reported synthesis procedure allows the synthesis of high quality inorganic aerogels starting from cheap salt based precursors.
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
Deposited By: Milow, Dr. Barbara
Deposited On:01 Jul 2013 08:34
Last Modified:10 Jan 2019 15:54

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