Details
| Titel in Übersetzung | The effect of in liquids dissolved dense gases on interfacial and wetting characteristics |
|---|---|
| Originalsprache | Deutsch |
| Seiten (von - bis) | 29-45 |
| Seitenumfang | 17 |
| Fachzeitschrift | Forschung im Ingenieurwesen |
| Jahrgang | 71 |
| Ausgabenummer | 1 |
| Frühes Online-Datum | 5 Jan. 2007 |
| Publikationsstatus | Veröffentlicht - März 2007 |
| Extern publiziert | Ja |
Abstract
Measurements of interfacial tensions of water and ethanol in dense carbon dioxide up to 10 MPa and 373 K were performed. Also, in order to predict the wettability of these liquids on teflon and glass surfaces in the presence of carbon dioxide, contact angles between these liquids and both surfaces were determined under the same conditions of pressure and temperature. The interfacial tension were measured according to the pendant drop method. A mathematical derivation for the evaluation of the interfacial tension according to the geometry of the pendant drop and the difference of the density between the phases is presented. The contact angle determinations were performed using both the static and the dynamic method. The results show that because of the solubility of carbon dioxide in the liquids, the measured interfacial tensions are much lower than the interfacial tension of the pure substances. The interfacial tension appears as a function of only the density of CO2 above its critical temperature [1]. Even though the solubility of carbon dioxide in the liquid phase affects the interfacial tension, such a clear relation between these variables, like the one between the interfacial tension and the density of carbon dioxide, cannot be observed. The excess concentration on the interphase, as a measurement of adsorption according to Gibbs, was calculated for both systems. The contact angle of water on teflon surface increases with pressure until total non wetting is reached. On the other hand, the contact angle of ethanol decreases with the increasing pressure until spreading occurs. The same phenomena was noted for the wetting characteristic of water on glass surface. The contact angle of water increases as pressure increases. Ethanol spreads totally on the surface of glass at all evaluated pressures. With the dynamic method, contact anglesgreater than the ones obtained with the static method were measured.
ASJC Scopus Sachgebiete
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- Allgemeiner Maschinenbau
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in: Forschung im Ingenieurwesen, Jahrgang 71, Nr. 1, 03.2007, S. 29-45.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Zum Einfluss von in Flüssigkeiten unter Druck gelösten Gasen auf Grenzflächenspannungen und Benetzungseigenschaften
AU - Sutjiadi-Sia, Y.
AU - Marckmann, H.
AU - Eggers, R.
AU - Holzknecht, C.
AU - Kabelac, S.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/3
Y1 - 2007/3
N2 - Measurements of interfacial tensions of water and ethanol in dense carbon dioxide up to 10 MPa and 373 K were performed. Also, in order to predict the wettability of these liquids on teflon and glass surfaces in the presence of carbon dioxide, contact angles between these liquids and both surfaces were determined under the same conditions of pressure and temperature. The interfacial tension were measured according to the pendant drop method. A mathematical derivation for the evaluation of the interfacial tension according to the geometry of the pendant drop and the difference of the density between the phases is presented. The contact angle determinations were performed using both the static and the dynamic method. The results show that because of the solubility of carbon dioxide in the liquids, the measured interfacial tensions are much lower than the interfacial tension of the pure substances. The interfacial tension appears as a function of only the density of CO2 above its critical temperature [1]. Even though the solubility of carbon dioxide in the liquid phase affects the interfacial tension, such a clear relation between these variables, like the one between the interfacial tension and the density of carbon dioxide, cannot be observed. The excess concentration on the interphase, as a measurement of adsorption according to Gibbs, was calculated for both systems. The contact angle of water on teflon surface increases with pressure until total non wetting is reached. On the other hand, the contact angle of ethanol decreases with the increasing pressure until spreading occurs. The same phenomena was noted for the wetting characteristic of water on glass surface. The contact angle of water increases as pressure increases. Ethanol spreads totally on the surface of glass at all evaluated pressures. With the dynamic method, contact anglesgreater than the ones obtained with the static method were measured.
AB - Measurements of interfacial tensions of water and ethanol in dense carbon dioxide up to 10 MPa and 373 K were performed. Also, in order to predict the wettability of these liquids on teflon and glass surfaces in the presence of carbon dioxide, contact angles between these liquids and both surfaces were determined under the same conditions of pressure and temperature. The interfacial tension were measured according to the pendant drop method. A mathematical derivation for the evaluation of the interfacial tension according to the geometry of the pendant drop and the difference of the density between the phases is presented. The contact angle determinations were performed using both the static and the dynamic method. The results show that because of the solubility of carbon dioxide in the liquids, the measured interfacial tensions are much lower than the interfacial tension of the pure substances. The interfacial tension appears as a function of only the density of CO2 above its critical temperature [1]. Even though the solubility of carbon dioxide in the liquid phase affects the interfacial tension, such a clear relation between these variables, like the one between the interfacial tension and the density of carbon dioxide, cannot be observed. The excess concentration on the interphase, as a measurement of adsorption according to Gibbs, was calculated for both systems. The contact angle of water on teflon surface increases with pressure until total non wetting is reached. On the other hand, the contact angle of ethanol decreases with the increasing pressure until spreading occurs. The same phenomena was noted for the wetting characteristic of water on glass surface. The contact angle of water increases as pressure increases. Ethanol spreads totally on the surface of glass at all evaluated pressures. With the dynamic method, contact anglesgreater than the ones obtained with the static method were measured.
UR - http://www.scopus.com/inward/record.url?scp=33847612867&partnerID=8YFLogxK
U2 - 10.1007/s10010-006-0042-4
DO - 10.1007/s10010-006-0042-4
M3 - Artikel
AN - SCOPUS:33847612867
VL - 71
SP - 29
EP - 45
JO - Forschung im Ingenieurwesen
JF - Forschung im Ingenieurwesen
SN - 0015-7899
IS - 1
ER -