Journal ArticleDOI
The dependence of contact angles on drop size and line tension
J Gaydos,A. W. Neumann +1 more
- Vol. 120, Iss: 1, pp 76-86
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TLDR
In this paper, contact angle measurements of five n-alkanes, dodecane through hexadecane, on Teflon (FEP) were obtained as a function of drop size.Abstract:
We report contact angle measurements of five n-alkanes, dodecane through hexadecane, on Teflon (FEP) as a function of drop size. In all cases the contact angles decreased by approximately 5° when the drop size was increased from approximately 1 to 4 mm contact radius. A complete solution to the problem of mechanical equilibrium of a sessile drop on a solid surface indicates that the dependence of the contact angle on drop size may be explained by including the effect of line tension in the Young equation. The observed drop size dependence of the contact angle yields a line tension of (2.5 ± 0.5) × 10−6 J/m. Over the range of n-alkanes studied it was not possible to discern any dependence of the line tension on liquid surface tension.read more
Citations
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Journal ArticleDOI
Status of the three-phase line tension: a review
Alidad Amirfazli,A. W. Neumann +1 more
TL;DR: While the interface displacement model appears to have brought about consensus with respect to certain aspects of line tension behavior near wetting, this model maybe still too phenomenological to be satisfactory from a more fundamental standing.
Journal ArticleDOI
Thermocapillary Pumping of Discrete Drops in Microfabricated Analysis Devices
TL;DR: The thermocapillary pumping TCP (TCP) as discussed by the authors is a non-mechanical pumping mechanism for dropping nanoliter and picoliter-sized drops of liquid within microfabricated flow channels.
Journal ArticleDOI
Nanobubbles and the Nanobubble Bridging Capillary Force
Marc A. Hampton,Anh V. Nguyen +1 more
TL;DR: The purpose of this review is to bring together the many experimental results on nanobubbles and the resulting capillary force in order to clarify these phenomena, and a review of pertinentnanobubble stability and formation theories is presented.
Journal ArticleDOI
The debate on the dependence of apparent contact angles on drop contact area or three-phase contact line: A review
TL;DR: A review of the published articles on contact angles and summarizes the views of the both sides can be found in this article, where the weak and strong sides of both three-phase contact line and contact area approaches are discussed in detail and some practical conclusions are drawn.
Journal ArticleDOI
The significance and magnitude of the line tension in three-phase (solid-liquid-fluid) systems
TL;DR: In this paper, the authors discussed the significance of the line tension in three-phase systems and the contribution of the linear free energy to the energy of attachment (detachment) of fine particles at (from) an interface.
References
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Journal ArticleDOI
The Surface Tension of Pure Liquid Compounds
TL;DR: The surface tension tables presented in this paper are the result of a literature survey, evaluation, and compilation of data of some 2200 pure liquid compounds, 226 of which were reported for a single temperature.
Journal ArticleDOI
Determination of surface tension and contact angle from the shapes of axisymmetric fluid interfaces
TL;DR: A new methodology is presented for measuring interfacial properties of liquids, such as surface tension and contact angles, by analyzing the shape of an axisymmetric liquid-fluid interface without use of apex coordinates.
Journal ArticleDOI
Contact angles and their temperature dependence: thermodynamic status, measurement, interpretation and application
TL;DR: In this paper, the vertical plate model is used to measure contact angles on smooth and heterogeneous rolid surfaces and their temperature dependence. But the model is not suitable for smooth and homogeneous surfaces.
Journal ArticleDOI
Generalization of the classical theory of capillarity
L. Boruvka,A. W. Neumann +1 more
TL;DR: Gibbs' concept of dividing surfaces is supplemented explicitly by the concepts of dividing lines and dividing points in this paper, and the general forms of the fundamental equations for dividing surfaces and lines are established by considering the proper extensive geometric properties, in addition to area and length.
Journal ArticleDOI
Oil Lenses on Water and the Nature of Monomolecular Expanded Films
TL;DR: In this article, the condition for the formation of such stable lenses is that the spreading coefficient FS = γ1 − γ2 γ12 shall be negative and the magnitude of the linear tension at the lens boundary is also calculated.