Advances in Contact Angle, Wettability and Adhesion, Volume by K.L. Mittal(eds.)

By K.L. Mittal(eds.)

The subject of wettabilty is very vital from either primary and utilized features. The purposes of wettability diversity from self-cleaning home windows to micro- and nanofluidics.

This e-book represents the cumulative knowledge of a contingent of world-class (researchers engaged within the area of wettability. within the previous few years there was super curiosity within the "Lotus Leaf impact" and in figuring out its mechanism and the way to duplicate this impact for myriad purposes. the subjects of superhydrophobicity, omniphobicity and superhydrophilicity are of a lot modern curiosity and those are coated intensive during this book.

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Example text

It begins, however, to diminish again, directly the partition is pushed back to the point of the scale at which the increase of tension ceased. The water surface can thus exist in two sharply contrasted conditions; the normal condition, in which the displacement of the partition makes no impression on the tension, and the anomalous condition, in which every increase or decrease alters the tension”. 2 Advancing and receding contact angles for a droplet on a tilted solid surface [28]. 22 Advances in Contact Angle, Wettability and Adhesion This phenomenon was later investigated by Pockels [5], Ablett [6], and Adam and Jessop [7] who wrote: “In the extreme cases, the angle when the liquid is advancing over the solid may be 60° greater than when it is receding.

10. Recently, Xu and Choi [32] also proposed that the ratio of the actual contact line to the apparent contact line was a simple and efficient parameter to describe the pinning force and the contact angle hysteresis, instead of the solid fraction (area). They examined an evaporating droplet on superhydrophobic surfaces with square arrays of micropillar structures whose diameters were fixed at 5 μm while the inter-pillar distances were varied from 5 to 50 μm. 4 The schematic of a droplet moving on a solid substrate.

The static CA was also different (60°, 63°, and 68° for droplets vs. 98°, 99°, and 101° for bubbles, although the latter values were expected to be equal to 180° minus the former value). The reason for this effect requires further investigation [28]. According to CA hysteresis values obtained for solid-oil-water interface with oil droplet placed on the solid surface, the dependency of CA hysteresis on surface roughness is more considerable. 1). 1 Advancing and receding contact angles and hysteresis [28].

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