Line Tension and the Intrinsic Contact Angle in Solid–Liquid–Fluid Systems

✍ Scribed by Abraham Marmur

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 161 KB
• Volume: 186
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.4666

✦ Synopsis

the intrinsic contact angle u i that a liquid drop makes with An approximate theory for calculating the line tension in a an ideal solid surface (2, 8) solid-liquid-fluid system is presented and demonstrated for a solid-liquid-vapor system. The line tension is shown to depend on the contact angle. Consequently, the classical equation for the

intrinsic contact angle, in terms of the line tension, is modified. The magnitude of the line tension is shown to be less than 5 1 10 09 N, and its sign is shown to be positive for acute contact angles

where r is the radius of the base of the drop. When the solid and negative for obtuse contact angles. The deviation from the surface is not ideal, the base of the drop is not necessarily

Young contact angle is shown to be negligible for drops of macrocircular. In this case r should stand for the local radius of scopic size on an ideal solid surface.