Details
| Titel in Übersetzung | Interfacial free energies of Teflon and different liquids in dense nitrogen |
|---|---|
| Originalsprache | Deutsch |
| Seiten (von - bis) | 56-71 |
| Seitenumfang | 16 |
| Fachzeitschrift | Forschung im Ingenieurwesen |
| Jahrgang | 67 |
| Ausgabenummer | 2 |
| Publikationsstatus | Veröffentlicht - Juni 2002 |
| Extern publiziert | Ja |
Abstract
Measurements of interfacial tensions (±1-2%) for water, formamide, ethanediole and toluene in dense nitrogen up to 23 MPa and T = 295.7 K were made with the pendant drop method. Additionally contact angles of these liquids were measured as advancing contact angles on Teflon. Contact angles (ca. ±3°.) were evaluated by hand and software. Interfacial Free Energy in the system Teflon/N2, which was calculated by the interaction parameter Φ, is σTeflon/N2 = 19.4-25.2 mN m-1 for 0.1 MPa and σTeflon/N2 = 8.2-9.3 mN m-1 for 20 MPa. The Interfacial Free Energy in the system Teflon/N2 was determined through linear regression or solving the system of equations (Section 5). Using the contact angle and interfacial tension measurements a mean value for σTeflon/N2 = 22.3 mN m-1 at 0.1 MPa and 9.2 mN m-1 at 20 MPa (without Acid-Base procedure) and a pressure independent σTeflon/liquid results. For the different methods for calculating the Interfacial Free Energy of a solid, suggestions were made with which the contact angle on Teflon can be estimated at the given pressure, if the interfacial tension of the liquid is known. In chapter 5, the contact angles of 48 substances on Teflon at 0.1 MPa were taken from literature [8, 17] and compared to estimations made by the methods of Zisman and Fowkes. For C10 and higher n-alkanes, the results predicted by the method of Zisman are satisfactory. The estimations are less than 10°, compared to the literature values, whereas the calculated values with the method of Fowkes aren't satisfactory. For 38 non- n-alkanes the contact angle estimation with the method of Fowkes is significantly better than the estimations with the method of Zisman. The average deviation relative to the literature values are 4.9° and 6.9°.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Allgemeiner Maschinenbau
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Forschung im Ingenieurwesen, Jahrgang 67, Nr. 2, 06.2002, S. 56-71.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Grenzflächenenergien von Teflon und verschiedenen Flüssigkeiten in einer verdichteten Stickstoffatmosphäre
AU - Klante, D.
AU - Eggers, R.
AU - Holzknecht, C.
AU - Kabelac, S.
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/6
Y1 - 2002/6
N2 - Measurements of interfacial tensions (±1-2%) for water, formamide, ethanediole and toluene in dense nitrogen up to 23 MPa and T = 295.7 K were made with the pendant drop method. Additionally contact angles of these liquids were measured as advancing contact angles on Teflon. Contact angles (ca. ±3°.) were evaluated by hand and software. Interfacial Free Energy in the system Teflon/N2, which was calculated by the interaction parameter Φ, is σTeflon/N2 = 19.4-25.2 mN m-1 for 0.1 MPa and σTeflon/N2 = 8.2-9.3 mN m-1 for 20 MPa. The Interfacial Free Energy in the system Teflon/N2 was determined through linear regression or solving the system of equations (Section 5). Using the contact angle and interfacial tension measurements a mean value for σTeflon/N2 = 22.3 mN m-1 at 0.1 MPa and 9.2 mN m-1 at 20 MPa (without Acid-Base procedure) and a pressure independent σTeflon/liquid results. For the different methods for calculating the Interfacial Free Energy of a solid, suggestions were made with which the contact angle on Teflon can be estimated at the given pressure, if the interfacial tension of the liquid is known. In chapter 5, the contact angles of 48 substances on Teflon at 0.1 MPa were taken from literature [8, 17] and compared to estimations made by the methods of Zisman and Fowkes. For C10 and higher n-alkanes, the results predicted by the method of Zisman are satisfactory. The estimations are less than 10°, compared to the literature values, whereas the calculated values with the method of Fowkes aren't satisfactory. For 38 non- n-alkanes the contact angle estimation with the method of Fowkes is significantly better than the estimations with the method of Zisman. The average deviation relative to the literature values are 4.9° and 6.9°.
AB - Measurements of interfacial tensions (±1-2%) for water, formamide, ethanediole and toluene in dense nitrogen up to 23 MPa and T = 295.7 K were made with the pendant drop method. Additionally contact angles of these liquids were measured as advancing contact angles on Teflon. Contact angles (ca. ±3°.) were evaluated by hand and software. Interfacial Free Energy in the system Teflon/N2, which was calculated by the interaction parameter Φ, is σTeflon/N2 = 19.4-25.2 mN m-1 for 0.1 MPa and σTeflon/N2 = 8.2-9.3 mN m-1 for 20 MPa. The Interfacial Free Energy in the system Teflon/N2 was determined through linear regression or solving the system of equations (Section 5). Using the contact angle and interfacial tension measurements a mean value for σTeflon/N2 = 22.3 mN m-1 at 0.1 MPa and 9.2 mN m-1 at 20 MPa (without Acid-Base procedure) and a pressure independent σTeflon/liquid results. For the different methods for calculating the Interfacial Free Energy of a solid, suggestions were made with which the contact angle on Teflon can be estimated at the given pressure, if the interfacial tension of the liquid is known. In chapter 5, the contact angles of 48 substances on Teflon at 0.1 MPa were taken from literature [8, 17] and compared to estimations made by the methods of Zisman and Fowkes. For C10 and higher n-alkanes, the results predicted by the method of Zisman are satisfactory. The estimations are less than 10°, compared to the literature values, whereas the calculated values with the method of Fowkes aren't satisfactory. For 38 non- n-alkanes the contact angle estimation with the method of Fowkes is significantly better than the estimations with the method of Zisman. The average deviation relative to the literature values are 4.9° and 6.9°.
UR - http://www.scopus.com/inward/record.url?scp=18444400530&partnerID=8YFLogxK
U2 - 10.1007/s10010-002-0073-4
DO - 10.1007/s10010-002-0073-4
M3 - Artikel
AN - SCOPUS:18444400530
VL - 67
SP - 56
EP - 71
JO - Forschung im Ingenieurwesen
JF - Forschung im Ingenieurwesen
SN - 0015-7899
IS - 2
ER -