Influence of Surfactants on SiO2 Aerogels
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU124366" target="_blank" >RIV/00216305:26620/18:PU124366 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Influence of Surfactants on SiO2 Aerogels
Original language description
Silica aerogels, as well as those consisting of other metal oxides (alumina, zirconia, titania or mixture of these oxides), are extremely porous (up to 99%) high tech materials with very high specific surface areas (1000m2/g) and low thermal conductivity (below 0,02W/mK). The typical aerogel production process includes several steps and starts with the preparation of a sol. The next step includes a casting of the sol to obtain the required gel form via sol – gel transition and its drying in a supercritical drying chamber at supercritical conditions of CO2 to obtain the desired product. Hence it is of critical importance to determine how processing parameters (type of solvent, catalyst, surfactant, a medium of drying temperature, pressure, the presence of a surfactant template) influence the microstructure, morphology, transparency and other properties of the obtained aerogels. In this work, we studied the effect on three synthesized systems: SiO2-Triton, SiO2-PVP and SiO2-F1427 using TMOS, MeOH-NH4OH-H2O at constant molar ratios of reactants 1:7:0.7:2.7, respectively. Chemical, structural and morphological results were performed by using FTIR and SEM techniques. SEM analysis demonstrated a change in agglomerate size distribution (5-10nm) depending on the system. Furthermore, the increase in the amount of F217 agent increased both the density, measured by sample dimensions, of produced SiO2-F127 aerogels from 0.02 to 0.075 g/cm3 along with the pore size.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)
Result continuities
Project
<a href="/en/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Metal 2017 Conference Prosceedings
ISBN
978-80-87294-79-6
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
1135-1140
Publisher name
TANGER Ltd.
Place of publication
Ostrava
Event location
Brno
Event date
May 24, 2017
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000434346900181