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Subcritically dried RF-aerogels catalysed by hydrochloric acid

Reuß, Michael and Ratke, Lorenz (2008) Subcritically dried RF-aerogels catalysed by hydrochloric acid. Journal of Sol-Gel Science and Technology 47:74.

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Abstract

Hydrochloric acid (HCl) used as catalyst for the preparation of RF-aerogels leads to organic aerogels in very short gelation times. The gelation time can be varied from a few seconds to minutes. The wet gels can be dried under ambient conditions. By variation of the sol composition or catalyst concentration the microstructure of the dry gels can be modified. The aerogel densities are in the range of 210-410 kg/m<sup>3</sup>. The particle sizes, determined by scanning electron microscopy (SEM), are in the range of 700 to 1500 nm. The particles look essentially spherical and their size spectrum can be close to monodisperse. The specific surface is measured by nitrogen adsorption (BET). Thermogravimetry (TGA) is employed to study the drying process, annealing reactions and decomposition of the aerogel into a carbon aerogel.

Document Type:Article
Title:Subcritically dried RF-aerogels catalysed by hydrochloric acid
Authors:
AuthorsInstitution or Email of Authors
Reuß, MichaelUNSPECIFIED
Ratke, LorenzUNSPECIFIED
Date:2 April 2008
Journal or Publication Title:Journal of Sol-Gel Science and Technology 47:74
Refereed publication:Yes
In ISI Web of Science:Yes
Status:Published
Keywords:Sol-gel, RF-aerogels, Subcritically drying, Inorganic catalysis
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr.rer.nat. Michael Reuß
Deposited On:14 Aug 2008
Last Modified:27 Apr 2009 14:31

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