2012, Wolfgang Buscher, Wolfgang Buscher, Ehlbeck, Jörg, Piechotta, Christian

[no abstract available]

2015, Polak, Martin

Das Ziel des Projektes war die plasma-gestützte Schichtabscheidung einerseits zur Erzeugung von superhydrophoben und superhydrophilen Oberflächeneigenschaften und andererseits um die Adhäsion von Proteinen zu verbessern. Um dieses Ziel zu erreichen, wurden Niederdruck- und Atmosphärendruckplasmen zum Einsatz gebracht. Bei den Atmosphärendruckplasmen wurde darüber hinaus Quellen zur lokalen und zur flächigen Oberflächenveredelung untersucht. Sowohl die Erzeugung der superhydrophilen und superhydrophoben Oberflächeneigenschaften als auch die verbesserte Anhaftung von Proteinen konnte im Projekt erfolgreich umgesetzt werden.

2023, Lü, X., Röben, B., Biermann, K., Wubs, J.R., Macherius, U., Weltmann, K.-D., van Helden, J.H., Schrottke, L., Grahn, H.T.

We report on terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures, which exhibit single-mode emission at 3.360, 3.921, and 4.745 THz. These frequencies are in close correspondence to fine-structure transitions of Al atoms, N+ ions, and O atoms, respectively. Due to the low electrical pump power of these THz QCLs, they can be operated in a mechanical cryocooler in continuous-wave mode, while a sufficient intrinsic tuning range of more than 5 GHz is maintained. The single-mode operation and the intrinsic tuning range of these THz QCLs allow for the application of these lasers as radiation sources for high-resolution absorption spectroscopy to determine the absolute densities of Al atoms, N+ ions, and O atoms in plasmas.

2003, Ohl, A., Besch, W., Schröder, K.

[no abstract available]

2008, Kettlitz, M.

[no abstract available]

2005, Lange, Hartmut, Bussiahn, René, Gortchakov, Sergej, Holtz, Peter, Loffhagen, Detlef, Uhrlandt, Dirk

[no abstract available]

2019, Uhlmann, E., Riemer, H., An, S., Fröhlich, M., Paschke, H., Petersen, M.

Increasing demands in machining of high-tech materials and dry machining lead to higher thermal and mechanical loads on cutting tools. In response to these challenges, enhanced coating solutions are applied to increase performance and life of cutting tools. However, during the production process the cemented carbide substrates are contaminated with grinding oils and residues of organic material. For the subsequent physical vapor deposition (PVD) coating process an intensive and high-quality cleaning process is necessary. In this contribution, plasma electrolytic polishing (PEP) is used as a novel alternative to conventional ecologically harmful cleaning baths. Apart from the ecological advantage, the surface of the substrate can be optimized with regard to the coating adhesion. To examine the performance of the different cleaning processes, machining tests were performed at the IWF to evaluate the layer adhesion and tool life of the tools.

2008, Lommatzsch, Uwe, Foest, Rüdiger

[no abstract available]

2002, Röpcke, Jürgen, Mechold, Lars, Osiac, Mariana, Hempel, Frank, Saß, Stephan, Henkelmann, Rayk, Liebetrau, Andreas

[no abstract available]

2011, Glitsch, Sven, Röpcke, Jürgen, Weichbrodt, Frank

[no abstract available]