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Gels dried under supercritical and ambient conditions: a comparative study and their subsequent conversion to silica–carbon composite aerogels

Parakkulam Ramaswamy, Aravind and Ratke, Lorenz and Kolbe, Matthias and Soraru, Gian Domenico (2013) Gels dried under supercritical and ambient conditions: a comparative study and their subsequent conversion to silica–carbon composite aerogels. Journal of Sol-Gel Science and Technology. Springer. ISBN 10.1007/s10971-013-3118-2 ISSN 0928-0707

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Abstract

In present work, we have prepared gels with various compositions of methyltrimethoxysilane—3-(2,3- epoxypropoxy) propyltrimethoxysilane (MTMS-GPTMS) using a two-step acid base sol–gel process. To make a comparative study between the two common drying routes, we prepared gels under supercritical and also under ambient conditions. The density of the supercritically dried hybrid aerogels lies between 0.18 and 0.31 gcm-3, while the density of the ambient dried ones ranges between 0.35 and 0.42 gcm-3. The surface area of MTMS-0.25 GPTMS aerogel dried under supercritical conditions, has been found to be 464 m2 g-1 with a pore volume and average pore diameter of 1.24 cm3 g-1 and 11 nm respectively. The same composition dried under ambient conditions is found to have similar properties i.e. a BET surface area of 439 m2 g-1, pore volume of 1.22 cm3 g-1 and average pore diameter of 11 nm. The aerogels were later pyrolyzed yielding silica/carbon composite aerogels. The pyrolized aerogels possessed a surface area as high as 207 m2 g-1 with a total pore volume of 0.98 cm3 g-1. The pyrolysed aerogels were also calcined to yield carbon free materials.

Item URL in elib:https://elib.dlr.de/84325/
Document Type:Article
Title:Gels dried under supercritical and ambient conditions: a comparative study and their subsequent conversion to silica–carbon composite aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Parakkulam Ramaswamy, AravindUNSPECIFIEDUNSPECIFIED
Ratke, LorenzUNSPECIFIEDUNSPECIFIED
Kolbe, MatthiasUNSPECIFIEDUNSPECIFIED
Soraru, Gian DomenicoUNSPECIFIEDUNSPECIFIED
Date:2013
Journal or Publication Title:Journal of Sol-Gel Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Springer
ISSN:0928-0707
ISBN:10.1007/s10971-013-3118-2
Status:Published
Keywords:Aerogels  Ambient pressure drying  Silica/ carbon composite  Hybrid aerogels
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: Parakkulam Ramaswamy, Dr Aravind
Deposited On:19 Sep 2013 08:38
Last Modified:06 Sep 2019 15:15

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