Metastable Nanobubbles at the Solid–Liquid Interface Due to Contact Angle Hysteresis

Langmuir ◽  
2015 ◽  
Vol 31 (3) ◽  
pp. 982-986 ◽  
Author(s):  
Takashi Nishiyama ◽  
Yutaka Yamada ◽  
Tatsuya Ikuta ◽  
Koji Takahashi ◽  
Yasuyuki Takata
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

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.

Adsorption of azacrown ethers at solid–liquid interface. Contact angle and neutron reflectivity study

2009 ◽  
Vol 256 (1) ◽  
pp. 274-279 ◽  
Author(s):  
Kamil Wojciechowski ◽  
Anna Brzozowska ◽  
Sebastien Cap ◽  
Witold Rzodkiewicz ◽  
Thomas Gutberlet
Keyword(s):  
Contact Angle ◽  
Liquid Interface ◽  
Neutron Reflectivity ◽  
Azacrown Ethers ◽  
Interface Contact ◽  
Solid Liquid Interface ◽  
Solid Liquid

scholarly journals Towards optimization of patterned superhydrophobic surfaces

2007 ◽  
Vol 4 (15) ◽  
pp. 643-648 ◽  
Author(s):  
Bharat Bhushan ◽  
Michael Nosonovsky ◽  
Yong Chae Jung
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Hydrophobic Surface ◽  
Dimensional Parameter ◽  
Wetting Properties ◽  
Spacing Factor ◽  
Composite Interface ◽  
Experimental Values ◽  
Solid Liquid Interface ◽  
Solid Liquid

Experimental and theoretical study of wetting properties of patterned Si surfaces with cylindrical flat-top pillars of various sizes and pitch distances is presented. The values of the contact angle (CA), contact angle hysteresis (CAH) and tilt angle (TA) are measured and compared with the theoretical values. Transition from the composite solid–liquid–air to the homogeneous solid–liquid interface is investigated. It is found that the wetting behaviour of a patterned hydrophobic surface depends upon a simple non-dimensional parameter, the spacing factor, equal to the pillar diameter divided by the pitch. The spacing factor controls the CA, CAH and TA in the composite interface regime, as well as destabilization and transition to the homogeneous interface. We show that the assumption that the CAH is a consequence of the adhesion hysteresis and surface roughness leads to the theoretical values of the CAH that are in a reasonably good agreement with the experimental values. By decreasing the spacing factor, the values of CA=170°, CAH=5° and TA=3° are achieved. However, with further decreasing of the spacing factor, the composite interface destabilizes.

scholarly journals Polar effects at solid/liquid interfaces

1970 ◽  
Vol 48 (5) ◽  
pp. 865-866 ◽  
Author(s):  
A. C. Lowe ◽  
A. C. Riddiford
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Unit Area ◽  
Liquid Interface ◽  
Liquid Interfaces ◽  
Advancing Contact Angle ◽  
Solid Liquid Interface ◽  
Glass Surfaces ◽  
Solid Liquid

Studies of the advancing contact angle of water upon several alkylchlorosilaned glass surfaces at 22 °C lead to the view that, at zero or very low interfacial velocities, the free energy per unit area of the solid/liquid interface is governed by both dispersive and polar forces. At higher velocities, the polar forces may be neglected.

Role of titanium on the reactive spreading of lead-free solders on alumina

2006 ◽  
Vol 21 (12) ◽  
pp. 3222-3233 ◽  
Author(s):  
Laurent Gremillard ◽  
Eduardo Saiz ◽  
Velimir R. Radmilovic ◽  
Antoni P. Tomsia
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Triple Line ◽  
Contact Angles ◽  
Liquid Interface ◽  
Liquid Front ◽  
Wide Variability ◽  
Solid Liquid Interface ◽  
Lead Free Solders ◽  
Solid Liquid

The wetting of Sn3Ag-based alloys on Al2O3 has been studied using the sessile-drop configuration. Small additions of Ti decrease the contact angle of Sn3Ag alloys on alumina from 115° to 23°. Adsorption of Ti-species at the solid–liquid interface prior to reaction is the driving force for the observed decrease in contact angle, and the spreading kinetics is controlled by the kinetics of Ti dissolution into the molten alloy. The addition of Ti increases the transport rates at the solid–liquid interface, resulting in the formation of triple-line ridges that pin the liquid front and promote a wide variability in the final contact angles.

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