Abstract
Lotus flowers, rose petals, some plant leaves and insects have a naturally super-hydrophobic surface. In fact, the surface of a Lotus leaf is covered by micro and nano structures mixed with wax, which makes its surface superhydrophobic. In microfluidics, superhydrophobicity is an important factor in the rheometers on a chip. It is also sought in other complex fluids applications like the self-cleaning and the antibacterial materials. The wettability of the surface of solid support can be modified by altering its chemical composition. This means functionalizing the interface molecules to different chemical properties, and/or forming a thin film on the surface. We can also influence its texturing by changing its roughness. Despite considerable efforts during the last decade, superhydrophobic surfaces usually involve, among others, microfabrication processes, such as photolithography technique. In this study, we propose an original and simple method to create superhydrophobic surfaces by controlling elastic instability of poly-dimethylsiloxane (PDMS) films. Indeed, we demonstrate that the self-organization of wrinkles on top of non-wettable polymer surfaces leads to surperhydrophobic surfaces with contact angles exceeding 150°. We studied the transition Wenzel-Cassie, which indicated that the passage of morphology drops “impaled” to a type of morphology “fakir” were the strongest topographies.
Highlights
In recent decades, the study of super-hydrophobicity has become essential in many industrial sectors
From a fundamental point of view, the description of the phenomena of wettability is essentially based on the understanding of the nature of interactions that develop between the liquid and the wet surface
In order to explain this formation of wrinkles, many theories and experiments have been made order this formation of wrinkles, many theories andby experiments beenthe made overInthe past to
Summary
The study of super-hydrophobicity has become essential in many industrial sectors. From a fundamental point of view, the description of the phenomena of wettability is essentially based on the understanding of the nature of interactions that develop between the liquid and the wet surface. The chemical physics parameters of a surface play an essential role in the wettability properties. By controlling the chemical nature of the surface, we can obtain hydrophobic surfaces. Using factors which increase the actual contact surface, such as roughness or structure of surfaces can improve it and make it a superhydrophobic surface, which is often sought in the high-technology sectors where self-cleaning surfaces are required [1,2]. Take as example the lotus leaf, which has a natural superhydrophobic surface
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