Influence of Surfactants on SiO2 Aerogels

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Surfactants on SiO2 Aerogels

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Influence of Surfactants on SiO2 Aerogels

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Metal 2017 Conference Prosceedings

ISBN

978-80-87294-79-6

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

1135-1140

Název nakladatele

TANGER Ltd.

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

24. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000434346900181