Lotus-effect

Water- and dirt-repelling coatings have nanoparticles pointing outwards. Water is in touch with the surface at only a few points due to the surface tension it contracts to droplets which roll off ( lotus effect ). 

BioMEMS, lotus effect in, 22 123 Biomimetic affinity chromatography,... 

Lotus effect surfaces, 22 108-127 adhesion of dust on, 22 115-116 contact angle hysterisis and, 22 113-114 development of, 22 117-120 problems and outlook for, 22 123-124 properties and applications of materials with, 22 121-124 roughness and, 22 110-113 water repellancy of, 22 108-109, 109-110, 112 Lovastatin, 5 142... 

Microstructures. See also Microstructure fatigue properties and, 73 484-486 in lotus effect surfaces, 22 117-120 Microsuspension polymerization, of PVC, 25 670... 

Oxygen pipelines, 47 754 Oxygen plasma etching, of lotus effect surfaces, 22 117, 119 Oxygen pressure, in oxidation reactions, 49 82... 

Poly(dichlorophosphazene), 19 56 Polydicyclopentadiene, 8 231 20 432, 433 manufacture of, 20 430 properties of, 20 4221 Polydicyclopentadiene, 26 946-947 Polydime thy lsilane (PDMS). See also Polydimethylsiloxane entries biodegradability of, 22 604-605 lotus effect in, 22 123 pressure-sensitive adhesives and,... 

Reactive fibers, 9 486-489 Reactive flame retardants, 11 474-479 brominated, ll 475-477t Reactive gases, 13 456 Reactive groups, types of, 9 178 Reactive hot melt butyl sealants, 22 44 Reactive hot melt polyurethanes, 22 37-38 Reactive hot melt silicones, 22 35 Reactive ion-beam etching (RIBE), 22 184 Reactive ion etching (RIE), 20 278 22 183 of lotus effect surfaces, 22 120 Reactive lead alloys, 14 779 Reactive liquid metal infiltration process, 16 168... 

Sulfur hexafluoride production, 11 846 Sulfur hexafluoride reactive ion etching, in lotus effect surfaces, 22 120 Sulfuric acid, 24 260, 12 190, 23 563, 669, 754-801... 

Teflon HP Plus copolymers, 18 331 in lotus effect surfaces, 22 117 Teflon PFA. See also Tetrafluoroethylene-perfluorovinyl ether applications of, 18 338-339 chemical properties of, 18 332-333 economic aspects of, 18 338 electrical properties of, 18 334 health and safety factors related to, 18 338... 

Transparent composites, sol-gel technology in, 23 81 Transparent conducting oxides (TCOs), 22 135, 12 610-611 Transparent fused silica, 22 401 Transparent lotus effect thin films, 22 121 Transparent nonmetals... 

Figure 7.9 Water drop on a superhydrophobic surface showing a high apparent contact angle app- The combined effect of hydrophobicity and roughness on the right length scale, causes the Lotus effect.

Bernhard, S., Edwin, N., Markus, O., 2002, Geometyrical shaping of surfaces with a lotus effect. Patent US2002164443, EP1238717, DElOl 10589, JP2002321224. 

The Lotus Effect simulates the properties of the lotus flower in nature, by microstructured hydrophobic protrusions which enable surfaces to clean themselves by water in motion. By making use of innovative technologies, the Lotus Effect can be used on many different products. For example, self-cleaning surfaces could be used for self-adhesive films, injection moulded parts or painted components in the construction industry, for facade elements or window frames, for traffic facilities such as road signs, and not to forget cars themselves. 

Design of self-cleaning surfaces for technical applications Lotus-Effect ... 

Plasma Treatment of Textile Fibers Treatment of Cotton and Synthetic Textiles and the Lotus Effect... 

Plasma-induced hydrophobization of cottonfabric in conjunction with increased specific surface area leads to an interesting and practically important effect. Water droplets are able to effectively remove dirt particles from the surface of the cotton fabric. This phenomenon is illustrated in Fig. 9-29 for the case of HMDSO-plasma-treated cotton fabric (Hocker, 2002) and is usually referred to as the Lotus effect. Thus, the highly hydrophobic plasma-treated surface of cotton with specific plasma-modified surface topography is extremely dust- and dirt-repellant in contact with water. As an important consequence, the plasma-treated surface also becomes repellant to bacteria and fungi. The effect is relevant not only to cotton fiber but to some other materials as well. 

Gu ZZ, Uetsuka H, Takahashi K, Nakajima R, Onishi H, Fujishima A, Sato O (2003) Structiu-al color and the lotus effect. Angew Chem Int Ed 42 894... 

The opposite of super-hydrophobicity, the Lotus Effect, is super-oleophobicity, the Pitcher Plant Effect. A natural example of super-oleophobicity involves the Nepenthes Pitcher Plant, which has microtextured surfaces in which an aqueous liquid fills the spaces within the texture and forms a continuous overlying film to cause insects to slip into the plant s digestive juices. Here, the plant s super-oleophobic surface essentially repels the oils on the insects feet. This is termed the Pitcher Plant Effect. Microporous, microfibre coatings have been developed to mimic this effect and be highly repellent to oils while remaining permeable to water. 

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