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  • 1995-1999  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Dependence of photoemission efficiency on the pulsed laser cleaning of Tungsten photocathodes, part 1: Experimental (1997)
    Springer
    Applied physics 64 (1997), S. 467-471 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 81.60.Bn; 73.30.+y
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 3+ :YAG laser with 5th harmonic generator, generating 16 ps duration pulses at 213 nm, with energies up to 0.5 mJ. Experimental results concerning the action of laser pulses, as well as the effects of residual pressure on the cleanliness of the photocathodes surface are presented and discussed. Influence of laser pulses and residual pressure on the work function of the metal are also investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390050503
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  • 2
    Digitale Medien
    Digitale Medien
    Electroless plating of polymers: XPS study of the initiation mechanisms (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 449-453 
    Details
    ISSN: 1572-8838
    Schlagwort(e): electroless plating ; polymer metallization ; plasma ; palladium ; surface treatment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract This paper deals with polymer metallization by the electroless process. Previous studies in the authors' laboratory have shown the interest of plasma surface treatments of polymers before chemical metallization and the significant role they play towards the chemisorption of a catalyst (Pd2+ ions). Three different processes are used to activate the polymer surface for electroless deposition: namely, the one-step process using a mixed SnCl2–PdCl2 solution, the conventional two-step process using SnCl2, then PdCl2, and a new simplified process (using only PdCl2), previously proposed by the authors. According to the process utilized a variable initiation time is observed before metal deposition takes place in the metallization bath. The surface phenomena occurring on the polymer during this initiation time are studied by XPS through the chemical form of palladium adsorbed on the surface and through changes in the Pd surface concentration. A reaction mechanism relative to the initiation of the metallic ion reduction is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003204909001
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  • 3
    Digitale Medien
    Digitale Medien
    Influence of surface treatments of hot-dip galvanized steels on their acid-base properties and on their reactions with some organic compounds (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 307-312 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The surface of hot-dip galvanized steels is a complex system highly dependent upon the composition of the galvanization bath and upon surface treatments such as degreasing, alkaline etching and chromate conversion. In this study, industrial zinc-coated samples are subjected to degreasing, alkaline etching and chromating and then characterized by XPS and Fourier transform infrared spectroscopy (FTIR). Their surface reactivity is studied by vapourphase adsorption of probe molecules, either basic (pyridine) or acidic (phenol), and FTIR analysis. The reactivity enhancement following the alkaline etching is clearly evidenced by this technique. In order to gain information upon the reactivity of the hot-dip galvanized steel surface towards some organic components of epoxy resins, dicyandiamide adsorption was performed at 180°C on the chemically treated substrates. As suggested by the results obtained with probe molecules, alkaline etching of galvanized steels allows a dicyandiamide-zinc reaction leading to the formation of a defined complex. In addition, the study of the interaction of model substrates (pure zinc and aluminum-contaminated pure zinc) with dicyandiamide clearly shows that surface contamination of galvanized steels by aluminium is responsible for the inhibition of the dicyandiamide-zinc reaction.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740230506
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