Influence of contact angle on droplet parameters in ellipsoidal wettability model

Abstract

Contact angle is one of the most important indexes to evaluate the hydrophobicity of solid surface. In order to explore the wetting characteristics of droplets on anisotropic solid surfaces, including contact angle, droplet radius, droplet height, contact radius, contact area and projected area, an ellipsoidal droplet contact angle model was established. By collecting the droplet size parameters of FKM prepared by template method, the correctness of the theoretical model was verified. Among them, the maximum error between the theoretical value of droplet radius and the actual measured value is 4.3%, and the maximum error of droplet projected area is 2.1%. It is found that the contact angle is inversely proportional to the droplet-solid contact radius and contact area, and directly proportional to the projected area of the droplet. In addition, for the same droplet on the surface of the same solid material, it is observed that the contact radius between the droplet and the solid is small in the direction of large contact angle. This discovery is helpful to explain the hydrophobic mechanism of the material surface with anisotropic contact angle.

Physicochemical Properties of a Bioactive Polysaccharide Film from Cassia grandis with Immobilized Collagenase from Streptomyces parvulus (DPUA/1573)

“…The contact angle of polysaccharide films containing enzymes can be significantly influenced by various factors, such as ultraviolet (UV) radiation. UV irradiation can alter the contact angle and surface properties of biopolymeric films, leading to changes in surface roughness and polarity [53]. Furthermore, Zimoch-Korzycka et al [54] reported that the presence of enzymes such as cellulase in polysaccharide films can impact their physicochemical stability over time, affecting parameters such as water vapor permeability and tensile strength.…”

“…Furthermore, Zimoch-Korzycka et al [54] reported that the presence of enzymes such as cellulase in polysaccharide films can impact their physicochemical stability over time, affecting parameters such as water vapor permeability and tensile strength. Xu et al [53] found that UV irradiation exposure decreases water contact angles in certain polymer films, attributed to the formation and release of surfactants from irradiated surfaces.…”