The Experts below are selected from a list of 9672 Experts worldwide ranked by ideXlab platform
Stanislav N Gorb - One of the best experts on this subject based on the ideXlab platform.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Abstract Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200–300 nm wide, 7–9 μm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7°, whereas the CA of the flat polymer was about 92°. These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m−1) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200-300 nm wide, 7-9 microm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7 degrees , whereas the CA of the flat polymer was about 92 degrees . These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m(-1)) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
Pablo Perez Goodwyn - One of the best experts on this subject based on the ideXlab platform.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Abstract Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200–300 nm wide, 7–9 μm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7°, whereas the CA of the flat polymer was about 92°. These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m−1) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200-300 nm wide, 7-9 microm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7 degrees , whereas the CA of the flat polymer was about 92 degrees . These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m(-1)) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
Kenji Fujisaki - One of the best experts on this subject based on the ideXlab platform.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Abstract Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200–300 nm wide, 7–9 μm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7°, whereas the CA of the flat polymer was about 92°. These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m−1) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200-300 nm wide, 7-9 microm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7 degrees , whereas the CA of the flat polymer was about 92 degrees . These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m(-1)) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
Emerson De Souza - One of the best experts on this subject based on the ideXlab platform.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Abstract Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200–300 nm wide, 7–9 μm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7°, whereas the CA of the flat polymer was about 92°. These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m−1) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
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Moulding technique demonstrates the contribution of Surface geometry to the super hydrophobic properties of the Surface of a water strider
Acta Biomaterialia, 2008Co-Authors: Pablo Perez Goodwyn, Emerson De Souza, Kenji Fujisaki, Stanislav N GorbAbstract:Water striders (Insecta, Heteroptera, Gerridae) have a complex three-dimensional waterproof hairy cover which renders them super-hydrophobic. This paper experimentally demonstrates for the first time the mechanism of the super-hydrophobicity of the cuticle of water striders. The complex two-level microstructure of the Surface, including the smallest microtrichia (200-300 nm wide, 7-9 microm long), was successfully replicated using a two-step Moulding technique. The Mould Surface exhibited super-hydrophobic properties similar to the original insect Surface. The average water contact angle (CA) of the Mould was 164.7 degrees , whereas the CA of the flat polymer was about 92 degrees . These results show that (i) in water striders, the topography of the Surface plays a dominant role in super-hydrophobicity, (ii) very low Surface energy bulk material (typically smaller than 0.020 N m(-1)) is not necessary to achieve super-hydrophobicity; and (3) the two-step Moulding technique may be used to mimic quite complex biological functional Surfaces.
Radek Srb - One of the best experts on this subject based on the ideXlab platform.
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Mathematical model of the metal Mould Surface temperature optimization
2015Co-Authors: Jaroslav Mlýnek, Roman Knobloch, Radek SrbAbstract:The article is focused on the problem of generating a uniform temperature field on the inner Surface of shell metal Moulds. Such Moulds are used e.g. in the automotive industry for artificial leather production. To produce artificial leather with uniform Surface structure and colour shade the temperature on the inner Surface of the Mould has to be as homogeneous as possible. The heating of the Mould is realized by infrared heaters located above the outer Mould Surface. The conceived mathematical model allows us to optimize the locations of infrared heaters over the Mould, so that approximately uniform heat radiation intensity is generated. A version of differential evolution algorithm programmed in Matlab development environment was created by the authors for the optimization process. For temperate calculations software system ANSYS was used. A practical example of optimization of heaters locations and calculation of the temperature of the Mould is included at the end of the article.
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Differential Evolution and Heat Radiation Intensity Optimization
2014 International Conference on Mathematics and Computers in Sciences and in Industry, 2014Co-Authors: Jaroslav Mlýnek, Radek SrbAbstract:This article focuses on heat radiation intensity optimization across the Surface of an aluminium Mould. The inner Mould Surface is sprinkled with a special PVC powder and the outer Mould Surface is warmed by infrared heaters located above the Mould. This is an economic way of producing artificial leathers in the automotive industry (e.g. The artificial leather on a car dashboard). The article includes a description of a mathematical model that allows us to calculate the heat radiation intensity across the Mould Surface for every fixed location of the heaters. We also use this mathematical model to optimize the location of the heaters to provide approximately the same heat radiation intensity across the whole Mould Surface during the warming of the Mould. In this way we obtain a uniform colour tone and material structure of the artificial leather. The problem of optimization is more complicated. Using gradient methods is not suitable because the minimized function contains many local extremes. A differential evolution algorithm is used during the process of optimization. The calculations were performed by a Mat lab code written by the authors. The article contains a practical example including graphical outputs.
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the process of an optimized heat radiation intensity calculation on a Mould Surface
26th Conference on Modelling and Simulation, 2012Co-Authors: Jaroslav Mlýnek, Radek SrbAbstract:This article is focused on the optimization of heat radiation intensity across the Surface of an aluminium Mould. The Mould is warmed by infrared heaters located above the Mould Surface, and in this way artificial leathers in the automotive industry are produced (e.g. the artificial leather on a car dashboard). This described model allows us to specify the location of infrared heaters over the Mould to obtain approximately the same heat radiation intensity across the whole Mould Surface. In this way we can obtain a uniform material structure and colour tone across the whole Surface of artificial leather. We used a genetic algorithm and the technique of “hill-climbing” during the optimization process. A computational procedure was programmed in the language Matlab.
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Artificial leather production in the automotive industry
2012 ELEKTRO, 2012Co-Authors: Jaroslav Mlýnek, Radek SrbAbstract:This article is focused on the process of artificial leather production in the automotive industry (e.g. the artificial leather on a car dashboard). One successful manufacturing process is the heating of the Mould Surface by infrared heaters located above the Mould. We will describe one model of Mould warming, as well as a method to calculate the heat radiation intensity on the Mould Surface in order to pinpoint the location of infrared heaters. During the calculation of heat radiation intensity across the Mould Surface, we will use experimental measured values for the heat radiation intensity from a sensor in proximity to an infrared heater. It is necessary to maintain approximately the same heat radiation intensity across the whole Mould Surface during warming process. The model described in this article allows us to optimize the infrared heaters' location for this purpose. In this way, we obtain the same material structure and color tone across the whole Surface of an artificial leather. We will apply a genetic algorithm to optimize the heaters' location. A computational procedure of heat radiation intensity across Mould Surface and heaters location optimization was programmed in the language Matlab. The last chapter provides a practical example with a description of the solution.
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Optimization of a Heat Radiation Intensity on a Mould Surface in the Car Industry
Mechatronics, 2011Co-Authors: Jaroslav Mlýnek, Radek SrbAbstract:This article is focused on the process of the heat radiation intensity optimization on an aluminium Mould Surface intended for the production of artificial leather in the car industry (e.g. the artificial leather on a car dashboard). The inside of the Mould Surface is sprinkled with a special powder and its outside is heated by infra heaters located above the Mould, up to a temperature of 250°C. It is necessary to carry out the configuration optimization of the infra heater locations above the Mould in such way that the heat radiation intensity on the Mould Surface is approximately the same. The procedure of configuration optimization of the infra heater locations by use of a genetic algorithm is described in this paper. Experimental measured values for the heat radiation intensity in the surroundings of an infra heater are used for the calculation procedures.
