Contact Angle, Wettability and Adhesion, Volume 6 by Kash L. Mittal

By Kash L. Mittal

The subject of wettability (measured when it comes to touch perspective) is of super curiosity from either basic and utilized issues of view, Wettability performs a necessary function in lots of business methods, so an realizing of things dictating wettability and the way to modulate it's of paramount value. within the final years there was an explosive curiosity in superhydrophobic surfaces (i.e., surfaces with water touch perspective of 150° or larger) as a result of their relevance/importance in lots of parts starting from self-cleaning home windows to nanofluidics. additionally lately there was heightened task within the box of electrowetting.
Contact attitude, Wettability and Adhesion, quantity 6 is divided into 4 components: half 1: primary points; half 2: Wettability Control/Modification; half three: Superhydrophobic Surfaces; and half four: floor unfastened strength and Relevance of Wettability in Adhesion. the subjects coated contain: a advisor to the equilibrium touch angles maze: primary points of wetting of tough and chemically heterogeneous surfaces: paintings of adhesion for rock-oil-brine structures; Is the area basic?; wettability control/modification utilizing numerous techniques; superhydrophobic surfaces and how one can impart superhydrophobicity; adsorption on superhydrophobic surfaces; sturdy floor strength selection; floor amendment of other fabrics; relevance of wettability and adhesion points in various strengthened composites. In essence, this quantity displays the cumulative knowledge of many energetic and popular researchers and gives a observation on modern learn within the interesting global of touch angles and wettability. This quantity and its predecessors (5 volumes), containing bountiful details, should be of a lot price to somebody interested/involved in controlling wetting phenomena and their functions.

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4. After the primary peak, although the first secondary peak is considerably smaller than the primary peak, it is still greater ˜ at the appropriate than most of the following peaks. The return to a zero value of δ G point in each cycle is quite convincing. We conclude that the simple theory based on free energy reasonably explains most of the observed features, if we allow for a difference between an initial and then a secondary value for θo . ˜ is typically of the order of 10−7 N for Considering Fig.

Wetting Transitions Occurring on Rough Surfaces 35 On the same rough surface both the Wenzel and Cassie wetting regimes may co-exist. It was also demonstrated that under certain external stimuli, such as pressure, vibration, impact or electric field, the Cassie air trapping wetting state could be converted into the Wenzel one [4, 5, 26–35]. It is now well accepted that the Cassie air trapping wetting regime corresponds to a higher energetic state, and the Cassie–Wenzel transition is irreversible [4–6].

Saguy, Contact angle measurement on rough surfaces, J. Colloid Interface Sci. 274, 637–644 (2004). 39. G. Wolansky and A. Marmur, Apparent contact angles on rough surfaces: the Wenzel equation revisited, Colloids Surfaces A 156, 381–388 (1999). 40. S. Brandon, N. Haimovich, E. Yeger and A. Marmur, Partial wetting of chemically patterned surfaces: the effect of drop size, J. Colloid Interface Sci. 263, 237–243 (2003). 41. A. , Langmuir 19, 8343–8348 (2003). 42. A. Marmur, From hygrophilic to superhygrophobic: theoretical conditions for making highcontact-angle surfaces from low-contact-angle materials, Langmuir 24, 7573–7579 (2008).

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