The article describes two methods for measuring contact angles: the sessile drop method and the Wilhelmy plate method (hereinafter referred to as the Wilhelmy method). Physicochemical equations are cited, the solutions of which allow for the determination of contact angles (these have been implemented in the computational section of the application software for the UDPZ device and the K12 tensiometer). Research procedures used in measuring contact angles are described. Definitions of terms: surface free energy, contact angle, model liquids.
MEASUREMENTS OF CONTACT ANGLE BY THE SESSILE DROP AND THE WILHELMY PLATE METHOD
This paper examines two of the methods used in the process of measuring a contact angle, namely sessile drop method and the Wilhelmy plate method (hereinafter referred to as Wilhelmy method). It also includes some physicochemical equations whose solutions enable to determine contact angles (these were incorporated into computational section of application programs of UDPZ device and tensiometer K12). The paper embodies the description of research procedures that apply to measurements of contact angle as well as definitions of terms such as surface free energy, contact angle, model liquids.
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Source: Logistyka Magazine