Technologie-Entwicklungsgruppe TEG

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  • Publication
    Kohlenstoffnanoröhrchen für Scheibenheizung und Karosserie
    ( 2008)
    Kolaric, I.
    ;
    Nemec, D.
    ;
    Weis, D.G.
    Carbon Nano Tubes (CNT oder Kohlenstoffröhrchen im Nanometerbereich) bieten als Aktuatoren der Kraftfahrzeug-Regeltechnik viele Lösungen an. Jetzt ist den Entwicklern der Fraunhofer Technologie-Entwicklungsgruppe (Fraunhofer TEG) ein weiterer Durchbruch gelungen: CNT-Beschichtungen stehen als Scheibenheizungen für Automobilfenster und -spiegel vor der Serienreife. Die Anwendung der CNT-Technik in Verbundwerkstoffen könnte in naher Zukunft auch für die Fertigung extrem stabiler und leichter Karosserieteile von großer Bedeutung sein.
  • Publication
    Dehnungsempfindliche Sensoren
    ( 2008)
    Sandmaier, H.
    ;
    Weis, D.G.
    Die Nanotechnologie birgt ein hohes Innovationspotential und gilt als eine der Schlüsseltechnologien des 21. Jahrhunderts. Kohlenstoff-Nanoröhren (carbon nanotubes, CNT) sind mitunter die wichtigsten Vertreter dieser neuen Materialklasse und haben seit ihrer Entdeckung 1991 rasant an Interesse in Forschung und Entwicklung gewonnen. Zurückzuführen ist dies auf die außergewöhnlichen Materialeigenschaften, die Nanoröhrchen aufweisen und sie für eine Vielzahl von potentiellen Anwendungen, darunter auch Sensoren, als Materialkomponente interessant machen.
  • Publication
    Effect of electrochemical synthesis conditions on deflection of PEDOT bilayers
    ( 2007)
    Kiefer, R.
    ;
    Weis, D.G.
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    Travas-Sejdic, J.
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    Urban, G.
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    Heinze, J.
  • Publication
    Probing the intramolecular hydrogen bond of 2-(2-hydroxyphenyl) benzotriazoles in polar environment: A photophysical study of UV absorber efficiency
    ( 2007)
    Fluegge, A.P.
    ;
    Waiblinger, F.
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    Stein, M.
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    Keck, J.
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    Kramer, H.E.A.
    ;
    Fischer, P.
    ;
    Wood, M.G.
    ;
    DeBellis, A.D.
    ;
    Ravichandran, R.
    ;
    Leppard, D.
    An in-depth photophysical study is presented for a series of 2-(2-hydroxyphenyl)benzotriazoles (HBzTs); the structural characteristic of all these photostabilizers is their strong intramolecular hydrogen bridge (IMHB). Tinuvin P (TIN P, 11a) and six other HBzTs, with no substituent in the 3-position ortho to the hydroxy function, show pronounced phosphorescence already in the dark (at 77 K in a polar glass). Upon irradiation, the phosphorescence intensity rises further until an equilibrium value is attained (up to 1.5 fold the dark value). A kinetic model is given which excellently reproduces this phosphorescence evolution: it demonstrates phosphorescence to arise from open conformers where the IMHB has been broken. Phosphorescence excitation spectra match the absorption spectra of the open conformer and also that of the O-methyl homologue 11A which cannot form an IMHB. Fluorescence spectra likewise prove the equilibrium between the closed and open conformer for these H BzTs. In unpolar glasses as well as in the crystalline state, TTN P displays a long-wavelength (red) fluorescence (with an enormous Stokes shift of 10.000 cm-1) which is associated with the excited singlet state of the closed form after proton transfer within the IMHB, Si(C). In polar matrixes, on the other hand, a blue fluorescence is observed (with a regular Stokes shift) for all those HBzTs which have no 3-substituent shielding the IMHB against being opened by the polar solvent. This blue fluorescence, just as the characteristic phosphorescence evolution for these compounds, is associated with the open conformer. For HBzTs with an (alkyl) group ortho to the bridging OH group, however, a long-wavelength (red) fluorescence is again observed. The shielding effect of the 3-substituent shows a fine gradation, cumyl > 1,1,3,3-tetramethylbutyl (isooctyl) > i-butyl methyl.
  • Publication
    Rückgewinnung hochwertiger Minerale aus Asche sowie aus Rejekten der Papierindustrie
    ( 2007)
    Flügge, A.
    ;
    Betz, G.
    ;
    Baier, D.-U.
    Das neu entwickelte Verfahren befasst sich mit der Rückgewinnung hochwertiger Minerale aus Rejekten der Papierindustrie und Ascherückständen aus Verbrennungsanlagen. Als Rohstoff für das Verfahren sind feuchte Rejekte aus Papierfabriken und Altpapieraufbereitungsanlagen, Asche aus Kraftwerken und Verbrennungsanlagen geeignet. Die in den Abfällen in großer Menge enthaltenen mineralischen Pigmente werden durch ein chemisch-physikalisches Aufbereitungsverfahren bei höchster Qualität zurückgewonnen, so dass diese auch für besonders anspruchsvolle Produkte (Papierindustrie, Pharma, Kunststoffindustrie) wieder verwendet werden können. Der je nach Einsatzstoff CO²-neutrale oder CO²-zehrende Prozess führt zu einer drastischen Reduzierung der zu deponierenden Abfallmengen. Ein Konsortium von 6 Industriepartnern unter wissenschaftlicher Begleitung der Fraunhofer TEG hat in einem, von der Otto von Guericke Stiftung e.V. (AIF) geförderten Projekt eine kontinuierlich arbeitende Pilotanlage (3 mobile Seecontainer) erstellt. Diese Anlage steht ab Spätherbst 2007 Kunden für Machbarkeitstests zur Verfügung. Der Beitrag informiert über die ersten Versuchsergebnisse der Anlage.
  • Publication
    Development of measurement set-up for electromechanical analysis of bucky paper actuators
    ( 2007)
    Kosidlo, U.
    ;
    Weis, D.G.
    ;
    Hying, K.
    ;
    Haque, M.H.
    ;
    Kolaric, I.
    The main focus of this paper is a measurement set-up constructed to perform electromechanical characterization of bucky papers, which are sheets of carbon nanotubes (CNT) obtained via filtration process. The experimental set-up consists of three electrodes, where bucky paper serves also as the working electrode. Measurements are performed in liquid electrolyte to allow the build up of the electrochemical double-layer, which is necessary for the actuation of carbon nanotubes. The measurements are performed with focus on the out-of-plane strain and stress generated by the structure of interest.
  • Publication
    Recovery of minerals from paper mill rejects and ashes
    ( 2007)
    Flügge, A.P.
    ;
    Betz, G.
    ;
    Baier, D.U.
    The new process deals with the recycling of high quality minerals out of rejects from paper industry and ash from incineration plants. Moist rejects from paper mills and recovered paper treatment plants as well as ash from power plants and incineration plants are suitable for raw material for this recycling process. The waste materials still contain high amounts of mineral pigments. They can be recovered at such a high quality by a chemo-physical recycling process, that they can be reused for special superior products in paper pharmaceutical and plastic industry. Depending on the raw material, this is a CO2-neutral or even a CO2-consuming process. The process causes a tremendous reduction of waste for landfill. A consortium of six industrial partners and the R&D partner Fraunhofer TEG have built up a continuously working pilot plant in three mobile maritime containers. The project was funded by the Otto von Guericke Stiftung e. V. (AIF). The pilot plant can be offered to interested customers for testing in late autumn 2007. The article informs about first trial results of the pilot plant.
  • Publication
    Application of new front-end electronics for non-destructive testing of railroad wheel sets
    ( 2007)
    Kappes, W.
    ;
    Rockstroh, B.
    ;
    Bähr, W.
    ;
    Kröning, M.
    ;
    Rodner, C.
    ;
    Goetz, J.
    ;
    Nemec, D.
    For more than 6 years, the automated ultrasonic and eddy-current systems for the inspection of railroad wheel sets, developed by Fraunhofer IZFP and Fraunhofer TEG, have been field-hardened through daily operation at various maintenance facilities of the Deutsche Bahn (DB). The testing stations are equipped with IZFP's multi-channel electronics, a modular PC integrated system operating inside 19" rack-mounted industrial computers. Special requirements for new installations of stationary systems (AURA) and underfloor testing stations (UFPE) called for the development of state-of-the-art miniaturized front-end ultrasonic and eddy-current test instrumentation. This innovation offers new dimensions for the concept and design of such systems, including features providing effortless maintenance of the inspection systems. Due to the small size of the electronic modules they can be placed in close proximity to the transducer assembly. High-speed networking techniques ensure the transfer of all the acquired digital ultrasonic and eddy-current data from the frontend modules to the workstation responsible for data acquisition and analysis. The new front-end technology is applied for the testing stations of the latest generation. One example is a system installed at the DB plant Krefeld, specifically designed for the ultrasonic testing of ICE train drive wheels. The transducer assembly for wheel rim and disk inspection includes hot-swap modules with integrated UT front-end modules adapted to inspect specific wheel disk configurations. A second example represents testing equipment operating at the Süddeutsche Rail Service GmbH, Kaiserslautern. Ultrasonic and eddy-current front-end modules are responsible for the inspection of the wheel rim of disassembled wheel sets of freight cars. In addition to the wheel rim the solid axle is inspected in the same test stand using GE's Phased Array system. Miniaturized front-end modules are also advantageous for the inspection with the wheel sets installed at the train. The concept of such an underfloor testing system is outlined.
  • Publication
    Potential benefits, current supply, utilization and barriers to adoption: An exploratory study on German SMEs and innovation software
    ( 2006)
    Kohn, S.
    ;
    Hüsig, S.
    This paper deals with the employment of software in the innovation process in small and medium-sized enterprises. Based on an explorative market study of existing software tools developed to specifically support activities and methods in the innovation process, we found out that a large variety of these software products was available. Hence, our further research addresses the question of how far these products are specifically used in practice in German SMEs. The core outcome of our explorative investigation is the finding that software products are rarely used to support the innovation process in German SMEs. We identified some of the barriers to SME adoption of innovation software in Germany. Based on these findings, initial explanations and implications can be provided for suppliers of innovation software and for SMEs.