Journal ArticleDOI
Super Water-Repellent Surfaces Resulting from Fractal Structure
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In this article, the fractal dimension of the solid AKD surface was determined to be D ≈ 2.3 applying the box-counting method to the SEM images of the AKD cross section.Abstract:
Super water-repellent surfaces showing a contact angle of 174° for water droplets have been made of alkylketene dimer (AKD). Water droplets roll around without attachment on the super water-repellent surfaces when tilted slightly. The AKD is a kind of wax and forms spontaneously a fractal structure in its surfaces by solidification from the melt. The fractal surfaces of AKD repel a water droplet completely and show a contact angle larger than 170° without any fluorination treatments. Theoretical prediction of the wettability of the fractal surfaces has been given in the previous paper.3 The relationship between the contact angle of the flat surface θ and that of the fractal surface θf is expressed by the equation cos θf = (L/l)D-2 cos θ where (L/l)D-2 is the surface area magnification factor. The fractal dimension of the solid AKD surface was determined to be D ≈ 2.3 applying the box-counting method to the SEM images of the AKD cross section. L and l, which are the largest and the smallest size limits of ...read more
Citations
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Wetting and Spreading
TL;DR: In this article, the surface forces that lead to wetting are considered, and the equilibrium surface coverage of a substrate in contact with a drop of liquid is examined, while the hydrodynamics of both wetting and dewetting is influenced by the presence of the three-phase contact line separating "wet" regions from those that are either dry or covered by a microscopic film.
Journal ArticleDOI
Wetting and Roughness
TL;DR: In this article, the roughness of a solid is discussed, and it is shown that both the apparent contact angle and the contact angle hysteresis can be dramatically affected by the presence of roughness.
Journal ArticleDOI
Self-cleaning surfaces - virtual realities
TL;DR: Key advances in the understanding and fabrication of surfaces with controlled wetting properties are about to make the dream of a contamination-free (or 'no-clean') surface come true.
Journal ArticleDOI
What do we need for a superhydrophobic surface? A review on the recent progress in the preparation of superhydrophobic surfaces
TL;DR: This critical review focuses on the recent progress (within the last three years) in the preparation, theoretical modeling, and applications of superhydrophobic surfaces.
Journal ArticleDOI
Design and Creation of Superwetting/Antiwetting Surfaces
Xinjian Feng,Lei Jiang +1 more
TL;DR: In this paper, a survey of the recent achievements in the construction of surfaces with special wettabilities, such as superhydrophobicity, super-hydrophilicity and superoleophobicity, are presented.
References
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Journal ArticleDOI
Super-Water-Repellent Fractal Surfaces
TL;DR: In this article, the authors showed that fractal surfaces can be super water repellent (superwettable) when the surfaces are composed of hydrophobic (hydrophilic) materials.
Journal ArticleDOI
Fractal applications: Wettability and contact angle
TL;DR: In this article, the authors derived a theromodynamic expression for the equilibrium contact angle on fractal surfaces in which the welted surface area is a function of the contacting fluid, which can be decomposed into an areal contribution analogous to Wenzel's roughness ratio, which enhances the natural wettability characteristics of the material, and a wetability alteration factor due to fluid adsorbate size differences.