Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions
S.A. Lermontov
1
,
A N Malkova
1
,
N A Sipyagina
1
,
Kh E Yorov
2
,
G P Kopitsa
3, 4
,
A E Baranchikov
2, 5
,
V.K. Ivanov
5, 6
,
V. Pipich
7
,
N K Szekely
7
3
4
5
7
Jülich Centre for Neutron Science Outstation at MLZ, Garching, Germany
|
Publication type: Journal Article
Publication date: 2017-10-31
scimago Q4
wos Q4
SJR: 0.183
CiteScore: 1.3
Impact factor: 0.7
ISSN: 00201685, 16083172
Materials Chemistry
Metals and Alloys
Inorganic Chemistry
General Chemical Engineering
Abstract
SiO2-based aerogels have been produced be removing a solvent (ethanol or hexafluoroisopropanol) from lyogels both above and below the critical temperature of the alcohols (in the range 210–260 and 160–220°C, respectively). The resultant materials have been characterized by low-temperature nitrogen adsorption measurements, X-ray diffraction, thermal analysis, scanning electron microscopy, X-ray microanalysis, and small-angle and ultrasmall-angle neutron scattering. The results demonstrate that removing the solvent 20–30°C below the critical temperature of the solvent yields silica that is characterized by higher specific porosity and has the same or a larger specific surface area in comparison with the aerogels produced by drying under supercritical conditions. The nature of the solvent used and the solvent removal temperature influence the size and aggregation behavior of primary clusters and the cluster aggregate size in the aerogels.
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Lermontov S. et al. Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions // Inorganic Materials. 2017. Vol. 53. No. 12. pp. 1270-1278.
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Lermontov S., Malkova A. N., Sipyagina N. A., Yorov Kh. E., Kopitsa G. P., Baranchikov A. E., Ivanov V., Pipich V., Szekely N. K. Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions // Inorganic Materials. 2017. Vol. 53. No. 12. pp. 1270-1278.
Cite this
RIS
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TY - JOUR
DO - 10.1134/S002016851712007X
UR - http://link.springer.com/10.1134/S002016851712007X
TI - Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions
T2 - Inorganic Materials
AU - Lermontov, S.A.
AU - Malkova, A N
AU - Sipyagina, N A
AU - Yorov, Kh E
AU - Kopitsa, G P
AU - Baranchikov, A E
AU - Ivanov, V.K.
AU - Pipich, V.
AU - Szekely, N K
PY - 2017
DA - 2017/10/31
PB - Pleiades Publishing
SP - 1270-1278
IS - 12
VL - 53
SN - 0020-1685
SN - 1608-3172
ER -
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BibTex (up to 50 authors)
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@article{2017_Lermontov,
author = {S.A. Lermontov and A N Malkova and N A Sipyagina and Kh E Yorov and G P Kopitsa and A E Baranchikov and V.K. Ivanov and V. Pipich and N K Szekely},
title = {Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions},
journal = {Inorganic Materials},
year = {2017},
volume = {53},
publisher = {Pleiades Publishing},
month = {oct},
url = {http://link.springer.com/10.1134/S002016851712007X},
number = {12},
pages = {1270--1278},
doi = {10.1134/S002016851712007X}
}
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MLA
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Lermontov, S.A., et al. “Comparative analysis of the physicochemical characteristics of SiO2 aerogels prepared by drying under subcritical and supercritical conditions.” Inorganic Materials, vol. 53, no. 12, Oct. 2017, pp. 1270-1278. http://link.springer.com/10.1134/S002016851712007X.