Keding, Marcus

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Official Name
Keding, Marcus
Main Affiliation
Akademische Titel
DI
Email
marcus.keding@forschung-burgenland.at
Scopus Author ID
36468736300
Status
staff

Research Outputs

2013 2013 2012 2012 2011 2011 2010 2010 0.0 0.0 0.2 0.2 0.4 0.4 0.6 0.6 0.8 0.8 1.0 1.0

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  • No Thumbnail Available
    Publication
    Optimization of a container design for depositing uniform metal coatings on glass microspheres by magnetron sputtering
    (Elsevier, 2010-08-24)
    Schmid, G. 
    ;
    Eisenmenger-Sittner, C. 
    ;
    Hell, J. 
    ;
    Horkel, M. 
    ;
    Keding, Marcus 
    ;
    Mahr, H. 
    Coating granular substrates by PVD methods like magnetron sputtering is a very challenging process. Although many of such substrates may also be coated by other means like the sol gel method, there are coating materials (e. g. refractory metals) for which PVD processes are the method of choice. One of these substrates is hollow glass microspheres with 2–80 μm diameter which can be used for hydrogen storage if a proper catalytic film is applied. To achieve a uniform film by magnetron sputtering on all the spheres a special apparatus was used which basically consists of rotating vessels positioned beneath the target. The arising problems of agglutination of the powdery substrate were solved by designing a special coating vessel, where the spheres are contained during deposition. For testing the system first copper was used as a target material, which was then replaced by platinum since the glass microspheres are used for a catalytic application. The film thickness on the spheres was determined by optical absorption and matches well with the thickness calculated for the special vessel geometry. Additionally it is shown that the glass microspheres can be coated with a uniform layer by magnetron sputtering whereas coatings produced by a chemical deposition process are not continuous.
      70  1Scopus© Citations 17
  • No Thumbnail Available
    Publication
    Neutron transmission measurements on hydrogen filled microspheres
    (Elsevier, 2013-10-26)
    Dyrnjaja, Eva 
    ;
    Hummel, Stefan 
    ;
    Keding, Marcus 
    ;
    Smolle, Marie-Theres 
    ;
    Gerger, Joachim 
    ;
    Zawiswky, Michael 
    Hollow microspheres are promising candidates for future hydrogen storage technologies. Although the physical process for hydrogen diffusion through glass is well understood, measurements of static quantities (e.q. hydrogen pressure inside the spheres) as well as dynamic properties (e.g. diffusion rate of hydrogen through glass) are still difficult to handle due to the small size of the spheres (d ! 15 lm). For diffusion rate measurements, the long-term stability of the experiment is also mandatory due to the relatively slow diffusion rate. In this work, we present an accurate and long-term stable measurement technique for static and dynamic properties, using neutron radiography. Furthermore, possible applications for hydrogen filled microspheres within the scope of radiation issues are discussed.
      65  1Scopus© Citations 1