FIG. 33 Comparison of contact angles measured by the proposed method using circular cylinder with those from a photograph: (a) advancing contact angle; (b) receding contact angle.

doi:10.1201/9780203021262-128

Chapter

FIG. 33 Comparison of contact angles measured by the proposed method using circular cylinder with those from a photograph: (a) advancing contact angle; (b) receding contact angle.

Chapter

ABSTRACT

Six kinds of solid surfaces were prepared for the measurement of the contact angle: brass, duralumin, stainless steel, vinyl chloride, nylon, and Teflon. In a similar manner as the method using the cone surface described in

Section II.D, each material was finished by several methods, such as lathing and polishing, in order to measure contact angles for various surface roughnesses. The test liquids were water and 15% ethanol solution for the measurement of the contact angle and water, four kinds of ethanol solution of different concentrations, and two kinds of machine oils for the measurement of the liquid-vapor interfacial tension.