COMPARABLE EFFECTS OF ADSORPTION AND LINE TENSION ON CONTACT ANGLE OF A NUCLEATED DROPLET ON A PARTIALLY WETTABLE SUBSTRATE

2017 ◽  
Vol 5 (2) ◽  
pp. 113-128 ◽  
Author(s):  
Dmitry V. Tatyanenko ◽  
Alexander K. Shchekin
Keyword(s):  
Contact Angle ◽  
Line Tension

The impact of line tension on the contact angle of nanodroplets

2013 ◽  
Vol 40 (12) ◽  
pp. 934-941 ◽  
Author(s):  
Hong Peng ◽  
Greg R. Birkett ◽  
Anh V. Nguyen
Keyword(s):  
Contact Angle ◽  
Line Tension ◽  
The Impact

Dependence of the Contact Angle on Adsorption at the Solid-Liquid Interface

2010 ◽  
Author(s):  
C. A. Ward
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Pressure Range ◽  
Line Tension ◽  
Liquid Interface ◽  
Fluid Interfaces ◽  
Phase Line ◽  
Three Phase ◽  
Solid Liquid Interface ◽  
Solid Liquid

A method for determining the surface tension of solid-fluid interfaces has been proposed. For a given temperature and fluid-solid combination, these surface tensions are expressed in terms of material properties that can be determined by measuring the amount of vapor adsorbed on the solid surface as a function of xV, the ratio of the vapor-phase pressure to the saturation-vapor pressure. The thermodynamic concept of pressure is shown to be in conflict with that of continuum mechanics, but is supported experimentally. This approach leads to the prediction that the contact angle, θ, can only exist in a narrow pressure range and that in this pressure range, the solid-vapor surface tension is constant and equal to the surface tension of the liquid-vapor interface, γLV. The surface tension of the solid-liquid interface, γSL, may be expressed in terms of measurable properties, γLV and θ: γSL = γLV(1 − cosθ). The value of θ is predicted to depend on both the pressure in the liquid at the three-phase, line x3L, and the three-phase line curvature, Ccl. We examine these predictions using sessile water droplets on a polished Cu surface, maintained in a closed, constant volume, isothermal container. The value of θ is found to depend on the adsorption at the solid-liquid interface, nSL = nSL(x3L,Ccl). The predicted value of θ is compared with that measured, and found to be in close agreement, but no effect of line tension is found.

THE MODIFIED YOUNG'S EQUATION FOR THE CONTACT ANGLE OF A SMALL SESSILE DROP FROM AN INTERFACE DISPLACEMENT MODEL

1999 ◽  
Vol 13 (27) ◽  
pp. 3255-3259 ◽  
Author(s):  
HARVEY DOBBS
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Unit Length ◽  
Excess Free Energy ◽  
Line Tension ◽  
Rigid Substrate ◽  
Three Phase ◽  
Interface Displacement ◽  
Displacement Model ◽  
Young's Equation

We derive the modified Young's equation for the contact angle of a fluid droplet on a rigid substrate using an interface displacement model and identify the line tension with the excess free energy per unit length calculated previously for a straight three-phase contact line.

Lens size dependence of contact angle and the line tension of the dodecane-water-air system

1997 ◽  
Vol 129-130 ◽  
pp. 45-60 ◽  
Author(s):  
P. Chen ◽  
S.S. Susnar ◽  
C. Mak ◽  
A. Amirfazli ◽  
A.W. Neumann
Keyword(s):  
Contact Angle ◽  
Size Dependence ◽  
Line Tension ◽  
Air System

scholarly journals Collembola cuticles and the three-phase line tension

2017 ◽  
Vol 8 ◽  
pp. 1714-1722 ◽  
Author(s):  
Håkon Gundersen ◽  
Hans Petter Leinaas ◽  
Christian Thaulow
Keyword(s):  
Contact Angle ◽  
Surface Structure ◽  
Large Change ◽  
Line Tension ◽  
Contact Angles ◽  
Surface Structures ◽  
Exposed Surface ◽  
Phase Line ◽  
Three Phase ◽  
Cuticular Surface

The cuticles of most springtails (Collembola) are superhydrophobic, but the mechanism has not been described in detail. Previous studies have suggested that overhanging surface structures play an important role, but such structures are not a universal trait among springtails with superhydrophobic cuticles. A novel wetting experiment with a fluorescent dye revealed the extent of wetting on exposed surface structures. Using simple wetting models to describe the composite wetting of the cuticular surface structures results in underestimating the contact angles of water. Including the three-phase line tension allows for a prediction of contact angles in the observed range. The discrepancy between the contact angle predicted by simple models and those observed is especially large in the springtail Cryptopygus clavatus which changes, seasonally, from superhydrophobic to wetting without a large change in surface structure; C. clavatus does not have overhanging surface structures. This large change in observed contact angles can be explained with a modest change of the three-phase line tension.

scholarly journals Elastic Properties of Liquid Surfaces Coated with Colloidal Particles

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Edward Bormashenko ◽  
Gene Whyman ◽  
Oleg Gendelman
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Surface Density ◽  
Colloidal Particles ◽  
Physical Mechanism ◽  
Young Modulus ◽  
Line Tension ◽  
Equilibrium Contact Angle ◽  
Interfacial Effect ◽  
Liquid Surfaces

The physical mechanism of elasticity of liquid surfaces coated with colloidal particles is proposed. It is suggested that particles are separated by water clearings and the capillary interaction between them is negligible. The case is treated when the colloidal layer is deformed normally to its surface. The elasticity arises as an interfacial effect. The effective Young modulus of a surface depends on the interfacial tension, equilibrium contact angle, radius of colloidal particles, and their surface density. For the nanometrically scaled particles the line tension becomes essential and has an influence on the effective Young modulus.

Sign in / Sign up

Export Citation Format

Share Document