New insights into hydrophobicity at nanostructured surfaces: Experiments and computational models

Abstract

This review deals with different aspects of hydrophobicity at nanostructured surfaces. Theoretical and geometric effects as well as those of surface feature geometry on hydrophobicity are explored in this article. This review includes surface modification methods used to change surface hydrophobicity and effect on adhesion of cells as nano substrate. A small chapter is devoted to hydrophobicity at self-assembled monolayers as a special type of nanostructured surface. To the different models describing hydrophobicity is devoted one up to dated chapter. Calculation methods including quantum, density functional theory, and molecular modeling bring novel perspectives to the study of hydrophobicity at nanostructured surfaces.

Stretchable superhydrophobic elastomers with on-demand tunable wettability for droplet manipulation and multi-stage reaction

“…The increased contact angle and reduced adhesion of the liquid droplet to the surface from an increased f 2 induces a ‘sliding effect’. 57 A minimal change in the water contact angle is observed as the TS-60 sample is stretched from 4.5 to 5.0 and then to 5.5 mm (a tensile strain of 111% and 122%, respectively) (Fig. 4c), due to an almost unchanged area fraction of the microstructures during stretching.…”

CO2-philicity to CO2-phobicity Transition on Smooth and Stochastic Rough Cu-like Substrate Surfaces

“…The apparent CA formed between the CO 2 droplet and substrate surface was employed as the main metric to assess the wetting characteristics. ,, The procedure of apparent CA fitting is shown in Figure . Based on the radial distribution function (RDF) of the liquid CO 2 molecules at the saturation state at 233.15 K and 10.05 bar (see Figure S1).…”

“…The wettability of droplets on the solid surface mainly depends on the characteristic interaction energy between droplets and surfaces, the topography of the solid surface, and the presence of external fields. , Modifications of the surface topography are gaining prominence, arising from the lack of need for external energy input and low requirements for material properties. Generally, the contact angle (CA) is adopted as the metric to quantify the wettability.…”

New Nanofiber Composition for Multiscale Bubble Capture and Separation

“…Hydrophobic and superhydrophobic materials repel the liquid phase to maintain contact between the solid surface and gaseous phase and to avoid formation of a new solid–liquid interface. Surface wettability can be altered by manipulating the chemical properties and surface energy and with the surface roughness and microstructures. , Functionalizing the surface using nonpolar hydrophobic materials can improve the hydrophobicity by repelling the polar water molecules . The surface roughness elements, which can be created as precisely engineered surface porosities, are able to trap gas pockets and prevent liquid molecules from penetrating into the porosities .…”

“… 5 , 17 Functionalizing the surface using nonpolar hydrophobic materials can improve the hydrophobicity by repelling the polar water molecules. 18 The surface roughness elements, which can be created as precisely engineered surface porosities, are able to trap gas pockets and prevent liquid molecules from penetrating into the porosities. 19 Using both of these approaches, it is possible to enhance the hydrophobicity of a surface.…”