Supercritical drying of aerogel: In situ analysis of concentration profiles inside the gel and derivation of the effective binary diffusion coefficient using Raman spectroscopy

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Details zur Publikation

Autorinnen und Autoren: Klima T, Quiño J, Quiño J, Rühl M, Klima T, Ruiz F, Will S, Bräuer A
Zeitschrift: Journal of Supercritical Fluids
Verlag: Elsevier
Jahr der Veröffentlichung: 2016
Band: 108
Seitenbereich: 1-12
ISSN: 0896-8446
Sprache: Englisch


Abstract


We here experimentally visualize in situ temporally and spatially resolved composition and concentration fields developing inside silica aerogels during the supercritical drying process. For the extraction of the pore liquid ethanol we used supercritical carbon dioxide. The evolution of the composition profiles inside the gel was measured via one-dimensional Raman spectroscopy. The composition profiles were converted into concentration profiles using an equation of state. The evolution of the concentration fields shows that ethanol is continuously transported out of the gel. On the contrary CO2 is first transported into and at later drying times (before the depressurization) out of the gel structure. The binary diffusion coefficient was derived as a function of the composition and found to vary by two orders of magnitude for different stages of the drying process. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bräuer, Andreas PD Dr.
Erlangen Graduate School in Advanced Optical Technologies
Klima, Tobias
Lehrstuhl für Technische Thermodynamik
Klima, Tobias
Erlangen Graduate School in Advanced Optical Technologies
Quiño, Jaypee
Erlangen Graduate School in Advanced Optical Technologies
Quiño, Jaypee
Lehrstuhl für Technische Thermodynamik
Rühl, Martin
Erlangen Graduate School in Advanced Optical Technologies
Will, Stefan Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik


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Zitierweisen

APA:
Klima, T., Quiño, J., Quiño, J., Rühl, M., Klima, T., Ruiz, F.,... Bräuer, A. (2016). Supercritical drying of aerogel: In situ analysis of concentration profiles inside the gel and derivation of the effective binary diffusion coefficient using Raman spectroscopy. Journal of Supercritical Fluids, 108, 1-12. https://dx.doi.org/10.1016/j.supflu.2015.10.011

MLA:
Klima, Tobias, et al. "Supercritical drying of aerogel: In situ analysis of concentration profiles inside the gel and derivation of the effective binary diffusion coefficient using Raman spectroscopy." Journal of Supercritical Fluids 108 (2016): 1-12.

BibTeX: 

Zuletzt aktualisiert 2018-10-07 um 17:23