Topic
Surface tension
About: Surface tension is a research topic. Over the lifetime, 25410 publications have been published within this topic receiving 695471 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, a simple technique to prepare super-hydrophobic and super-oleophobic microtextured surfaces by spray coating a blend of poly(methyl methacrylate) (PMMA) and the low surface energy molecule 1H,1H,2H, 2H-heptadecafluorodecyl polyhedral oligomeric silsesquioxane (fluorodeecyl POSS), using an air brush with a pressurized nitrogen stream.
204 citations
••
TL;DR: In this paper, the effects of superhydrophobic surface deformation on the effective slip length were analyzed theoretically and a comparison with available data and related mathematical models was presented, along with a comparison of available data.
Abstract: A type of superhydrophobic surface consists of a solid plane boundary with an array of grooves which, due to the effect of surface tension, prevent a complete wetting of the wall. The effect is greatest when the grooves are aligned with the flow. The pressure difference between the liquid and the gas in the grooves causes a curvature of the liquid surface resisted by surface tension. The effects of this surface deformation are studied in this paper. The corrections to the effective slip length produced by the curvature are analyzed theoretically and a comparison with available data and related mathematical models is presented.
204 citations
••
TL;DR: A series of pillar-like patterned silicon wafers with different pillar sizes and spacing are fabricated by photolithography and further modified by a self-assembled fluorosilanated monolayer, finding the dynamic contact angles of water on these surfaces to be consistent with the theoretical predictions of the Cassie model and the Wenzel model.
Abstract: A series of pillar-like patterned silicon wafers with different pillar sizes and spacing are fabricated by photolithography and further modified by a self-assembled fluorosilanated monolayer. The dynamic contact angles of water on these surfaces are carefully measured and found to be consistent with the theoretical predictions of the Cassie model and the Wenzel model. When a water drop is at the Wenzel state, its contact angle hysteresis increases along with an increase in the surface roughness. While the surface roughness is further raised beyond its transition roughness (from the Wenzel state to the Cassie state), the contact angle hysteresis (or receding contact angle) discontinuously drops (or jumps) to a lower (or higher) value. When a water drop is at the Cassie state, its contact angle hysteresis strongly depends on the solid fraction and has nothing to do with the surface roughness. Even for a superhydrophobic surface, the contact angle hysteresis may still exhibit a value as high as 41 degrees for the solid fraction of 0.563.
204 citations
••
203 citations
••
TL;DR: In this paper, the van der Waals model was used to calculate the variation in contact angle with liquid species for a given solid at fixed temperature, and the authors compared the results with the results of a liquid film and a solid substrate.
Abstract: The contact angle between a liquid film and a solid substrate is treated in the van der Waals model used previously by the author to discuss gas adsorption on solid surfaces The model accounts for the occurrence of three types of wetting behavior, ie, complete wetting, partial wetting, and nonwetting, as well as for transitions between these different regimes According to this model, the contact angle depends on two parameters, namely the reduced temperature T/Tc, where Tc is the critical temperature of the liquid, and ew/kTc, where ew is the minimum in the liquid–solid interaction potential For high‐energy surfaces, corresponding to large ew/kTc, the contact angle decreases on increasing temperature; the opposite behavior is predicted to occur on sufficiently low‐energy surfaces With some hypotheses on how ew depends on the nature of the solid and liquid phases present, one can calculate the variation in contact angle with liquid species for a given solid at fixed temperature The theory is compare
203 citations