11 research outputs found

    Elektrische Energiespeichereinheit mit strukturiertem Ableiterblech und Verfahren zum Strukturieren eines Ableiterblechs einer elektrischen Energiespeichereinheit

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    Die vorliegende Erfindung betrifft eine elektrische Energiespeichereinheit 1 mit strukturiertem Ableiterblech 2 und ein Verfahren zum Strukturieren einer Oberfläche 4 einer Schutzschicht 3 des Ableiterblechs 2 der elektrischen Energiespeichereinheit 1 mit mindestens zwei Elektroden, wobei mindestens eine der Elektroden mit einem Ableiterblech 2 verbunden ist, bei dem auf und/oder in die Oberfläche 4 mittels Laserinterferenzstrukturierung eine Tiefenstruktur 5 durch einen Werkstoffabtrag und bzw. oder eine Werkstoffumschmelzung derart ausgebildet wird, dass eine Tiefe der Tiefenstruktur 5 geringer als eine Dicke der Schutzschicht 3 ist. Gleichzeitig wird die Tiefenstruktur 5 mit einem Kennzeichnungselement 8 versehen und/oder die Tiefenstruktur als Kennzeichnungselement 8 ausgebildet, das durch auftreffende elektromagnetische Strahlung aus einem Wellenlängenbereich ultravioletten Lichts, sichtbaren Lichts und/oder infraroten Lichts auslesbar wird

    Urgent resection of bleeding congenital mesenchymal chest wall hamartoma in an infant

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    We report a case with prenatally diagnosed large cystic-solid mesenchymal chest wall hamartoma. An attempt of conservative management was made however repeated intralesional hemorrhage led to enlargement and severe anemia which required urgent resection at the age of 8 weeks. The infant had an unimpaired development over a follow-up of 4 years

    Large area micro-/nano-structuring using direct laser interference patterning

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    Smart surfaces are a source of innovation in the 21^st Century. Potential applications can be found in a wide range of fields where improved optical, mechanical or biological properties can enhance the functions of products. In the last years, a method called Direct LaserInterference Patterning (DLIP) has demonstrated to be capable of fabricating a wide range of periodic surface patterns even with resolution at the nanometer and sub-micrometer scales. This article describes recent advances of the DLIP method to process 2D and 3D parts. Firstly, the possibility to fabricate periodic arrays on metallic substrates with sub-micrometer resolution is shown. After that, different concepts to process three dimensional parts are shown, including the use of Cartesian translational stages as well as an industrial robot arm. Finally, some application examples aredescribed

    Bringing the direct laser interference patterning method to industry: A one tool-complete solution for surface functionalization

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    Direct Laser Interference Patterning is an emerging technology capable to produce micro- and nanostructured surfaces on a wide variety of materials. Although, this method has shown to be capable to produce functionalized surfaces in a one-step process, it will have impact on real applications only if compact systems and solutions are developed. This study shows recent developments of interference patterning optical heads capable to produce periodic patterns at high fabrication speeds (0.1 - 5 m(2)/min) as well as to solutions to be integrated in roll-to-roll processes. A concept of an interference patterning system (DLIP-mu Fab) is also described. Application examples showing control of tribological properties of 100Cr6 steel, cell orientation on patterned polyimide surface as well as the fabrication of high resolution decorative elements are discussed

    Heat transfer model of dropwise condensation and experimental validation for surface with coating and groove at low pressure

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    It is well known that dropwise condensation corresponds to a high heat transfer coefficient. The high performance enhancement of dropwise condensation in comparison to filmwise condensation is attributed to the ability of non-wetting droplets to be shed from the surface by gravity, therefore reducing the overall thermal resistance. The common treatments to carry out the hydrophobic surface for dropwise condensation are coating and structure. The improvement of heat transfer efficiency by combination of surface treatments with coating and groove structure has been proved compared of surface with single surface treatment by coating or groove structure. Based on this result, in this study presents a model developed to predict the heat transfer efficiency of dropwise condensation for surface with coating and groove structure features. The model is established by heat transfer though a single droplet with the drop size distribution. The heat transfer of single drop is not only analyzed as combination of thermal resistances, but also considered capillary effect of droplet due to groove geometry and properties of surface. In addition, the model results are validated with experimental data which is investigated by varied modification of vapor side metallic surface properties at low absolute pressure. It can be a reference to design industrial condensers of heat exchangers in the future. Further to optimize the surface properties and improve the higher heat transfer performance of dropwise condensation

    Direct laser interference patterning, 20 years of development: From the basics to industrial applications

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    Starting from a simple concept, transferring the shape of an interference pattern directly to the surface of a material, the method of Direct Laser Interference Patterning (DLIP) has been continuously developed in the last 20 years. From lamppumped to high power diode-pumped lasers, DLIP permits today for the achievement of impressive processing speeds even close to 1 m²/min. The objective: to improve the erformance of surfaces by the use of periodically ordered microand nanostructures. This study describes 20 years of evolution of the DLIP method in Germany. From the structuring of thin metallic films to bulk materials using nano- and picosecond laser systems, going through different optical setups and industrial systems which have been recently developed. Several technological applications are discussed and summarized in this article including: surface micro-metallurgy, tribology, electrical connectors, biological interfaces, thin film organic solar cells and electrodes as well as decorative elements and safety features. In all cases, DLIP has not only shown to provide outstanding surface properties but also outstanding economic advantages compared to traditional methods
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