Rationalization of the Behavior of Solid−Liquid Surface Free Energy of Water in Cassie and Wenzel Wetting States on Rugged Solid Surfaces at the Nanometer Scale

Langmuir ◽  
2011 ◽  
Vol 27 (2) ◽  
pp. 637-645 ◽  
Author(s):  
Frédéric Leroy ◽  
Florian Müller-Plathe
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Liquid Surface ◽  
Solid Surfaces ◽  
Nanometer Scale ◽  
Solid Liquid

The measurement of the solid–liquid surface free energy of xenon

2003 ◽  
Vol 118 (17) ◽  
pp. 7981-7984 ◽  
Author(s):  
I. Stalder ◽  
J. H. Bilgram
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Liquid Surface ◽  
Solid Liquid

scholarly journals SURFACE EVOLVER SIMULATIONS OF DROPS ON MICROPOSTS

2012 ◽  
Vol 23 (08) ◽  
pp. 1240013 ◽  
Author(s):  
MATTHEW L. BLOW ◽  
JULIA M. YEOMANS
Keyword(s):  
Free Energy ◽  
Arbitrary Shape ◽  
Liquid Surface ◽  
Superhydrophobic Surfaces ◽  
Surface Evolver ◽  
Horizontal Section ◽  
Good Convergence ◽  
Cassie State ◽  
Wenzel State ◽  
Solid Liquid

An important feature in the design of superhydrophobic surfaces is their robustness against collapse from the Cassie–Baxter configuration to the Wenzel state. Upon such a transition a surface loses its properties of low adhesion and friction. We describe how to adapt the Surface Evolver algorithm to predict the parameters and mechanism of the collapse transition on posts of arbitrary shape. In particular, contributions to the free energy evaluated over the solid–liquid surface are reduced to line integrals to give good convergence. The algorithm is validated for straight, vertical and inclined, posts. Numerical results for curved posts with a horizontal section at their ends show that these are more efficient in stabilizing the Cassie state than straight posts, and identify whether the interface first depins from the post sides or the post tips.

Interactions of components and elements of the surface free energy at interfaces

1991 ◽  
Vol 56 (2) ◽  
pp. 277-295 ◽  
Author(s):  
Jan Kloubek
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Polar Phase ◽  
Free Energies ◽  
Dispersion Component ◽  
Liquid Systems ◽  
Interfacial Free Energies ◽  
Total Surface Free Energy ◽  
Solid Liquid ◽  
New Hypothesis

A new hypothesis is suggested for the evaluation of the components (γd and γab) and the elements (γa and γb) of the surface free energy. The respective equations are introduced for the interactions at interfaces between a non-polar acid and non-polar base, a polar phase and non-polar acid or base, and two polar phases. The dispersion component, γd, equals the total surface free energy of non-polar phases. However, they can interact at the interface as an acid or a base through their single permanent elements γa or γb, respectively. Otherwise, induced elements γia and γib can also be effective. The surface free energy of polar phases is additively composed of the dispersion, γd, and acid-base components, γab = 2(γaγb)1/2. The proposed equation are verified using the known values of the surface and interfacial free energies for the liquid-liquid systems and they are applied to the solid-liquid interfaces. The values of the elements are determined for water, γwa = 67.7 and γwb = 10.6 mJ/m2, and for other liquids, such as glycerol, formamide, mercury, benzene, diethyl ether and trichloromethane.

Some Remarks on the Components of the Liquid Surface Free Energy

1999 ◽  
Vol 211 (1) ◽  
pp. 96-103 ◽  
Author(s):  
Bronisław Jańczuk ◽  
Tomasz Białopiotrowicz ◽  
Anna Zdziennicka
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Liquid Surface

scholarly journals Simple measurement of surface free energy using a web cam

2012 ◽  
Vol 34 (3) ◽  
Author(s):  
C.M.S Vicente ◽  
P.S. André ◽  
R.A.S. Ferreira
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Surface Science ◽  
Low Cost ◽  
Solid Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Water Glycerol ◽  
Simple Measurement ◽  
Materials Used

In this paper we describe a simple and pedagogical experiment to measure surface free energy (SFE), which is a mainstream subject to teach undergraduate and graduate level Physics science. Beyond this, the advantage of this work relies on the simplicity of the materials used, namely non-harmful and low cost products such as water, glycerol, ethylene glycol and propanol, offering a useful pedagogical opportunity to discuss basic but relevant concepts regarding surface science phenomena. As example, contact angle measurements were used to estimate SFE and the wetting behavior of distinct solid surfaces such as glass and polytetrafluoroethylene (PTFE, Teflon®).

Sign in / Sign up

Export Citation Format

Share Document