hydrophobic coatings

1 Experimental [1] Sample preparation The AZ91D magnesium alloy was chosen as experimental material, whose chemical composition was shown in Table 1. The test plates were cut into 10 m×10 mm coupons and polished to 1.5μm mirror finish. The surface was first ground with No.1000 SiC paper, followed by No.1500, No.2000, and finally 1.5μm diamond suspension in oil. The polished specimens were degreased by sonicating in acetone for 10 min, and then methanol for 10 min with a final distilledRead More …

The surface properties of materials are very important, and researchers attempt all sorts of methods to obtain materials surfaces with required properties. With the development of bionic engineering, researchers are paying an increasing attention to biological surface in order to understand how the nature can solve engineering problems. The extensive investigations on biological surfaces have revealed that these surfaces have many unusual properties. The “lotus-effect” is a typical phenomenon that the natural surface structure as blueprint is used to designRead More …

People know the self-cleaning lotus effect for many years, but can not make the material as the lotus leaf surfaces. By nature, the typical superhydrophobic surface – study found that lotus leaf, constructed with a special geometry of roughness in the low surface energy solid surface plays an important role on superhydrophobic.Based on these principles, the scientists began to mimic this surface. Now, research on rough superhydrophobic surface has been quite a lot of coverage. In general, the superhydrophobic surfaceRead More …

Wettability is an important feature of the solid surface, which is determined by the chemical composition and morphology of the surface. Super-hydrophilic and super hydrophobic surface characteristics are the main contents of invasive studies. The superhydrophobic (water-repellent) surface generally refers to the surface that the contact angle between water and surface is greater than 150 degrees. That people know superhydrophobic surface is mainly from plant leaves – lotus leaf surface, “self-cleaning” phenomenon. For example, water droplets can roll to rollRead More …

Super-hydrophobic coatings can be made from many different materials. The following are known possible bases for the coating: Manganese oxide polystyrene (MnO2/PS) nano-composite Zinc oxide polystyrene (ZnO/PS) nano-composite Precipitated calcium carbonate Carbon nano-tube structures Silica nano-coating Super-hydrophobic coatings are used to create super hydrophobic surfaces. When water or a water based substance comes into contact with these coated surfaces, the water or substance will “run off” of the surface because of the hydrophobic characteristics of the coating. Neverwet is aRead More …

Due to the extreme repellence and in some cases bacterial resistance of hydrophobic coatings, there is much enthusiasm for their wide potential uses with surgical tools, medical equipment, textiles, and all sorts of surfaces and substrates. However, the current state of the art for this technology is hindered in terms of the weak durability of the coating making it unsuitable for most applications. Newer engineered surface textures on stainless steel are extremely durable and permanently hydrophobic. Optically these surfaces appearRead More …

Conventional sol-gel coatings were prepared using MTMOS and TEOS as silane precursors to form a smooth, clear and dense organic/inorganic network on an aluminum alloy substrate. Such coatings are known to have excellent adhesion due to their ability to form Al-O-Si linkages at the coating/substrate interface. Sample-II in this study represents such a conventional sol-gel coating. In order to reduce surface energy, and hence increase hydrophobicity, we incorporated an organo-silane containing a fluorooctyl chain, in addition to MTMOS and TEOSRead More …