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  • electrodeposition  (2)
  • Ni– P alloys  (1)
  • chiral NSAID  (1)
  • Rheumatoid arthritis
  • ketoprofen
  • 1995-1999  (3)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Electrodeposition of zinc–nickel alloys from ammonia-containing baths (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 1035-1044 
    Details
    ISSN: 1572-8838
    Keywords: ammonia ; cyclic voltammetry ; electrodeposition ; gas–liquid equilibria ; speciation diagrams ; zinc–nickel alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes the use of ammonia-containing baths for Zn–Ni alloy electrodeposition. Buffering properties of the ammonia/ammonium couple limit the local change in pH in the vicinity of the electrode surface caused by simultaneous hydrogen evolution. In addition, it is shown that the divalent zinc and nickel species exist in the form of Zn(NH3) 4 2+ and Ni(NH3) 6 2+ complexes over a large pH range. The electrochemistry of the deposition at pH 10 was investigated by galvanostatic experiments and cyclic voltammetry, and compared with deposition from ammonium chloride baths at pH 5. The Ni content in the alloys were found to be 40–60% higher from the ammonia-containing bath than from the acidic baths. Reduction of divalent ions and hydrogen evolution were shown to occur at potentials 250 mV more cathodic than with baths at pH 5; the deposition mechanism may be affected by complexation of the metal cations by ammonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003610617785
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal effects of a laser beam on the electrodeposition of Ni–P alloys (1997)
    Springer
    Journal of applied electrochemistry 28 (1997), S. 80-88 
    Details
    ISSN: 1572-8838
    Keywords: Ni– P alloys ; electrodeposition ; acetate electrolyte ; hypophosphite ; continuous and pulsed laser ; thermal effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The paper deals with the effects of an incident laser beam on electrodeposition of Ni–P alloys from dilute acetate solutions. The kinetics of separate reductions of Ni2+ and H2PO−2 species were first investigated by linear sweep voltammetry, varying the hypophosphite concentration and the solution temperature: comparison of the kinetically limited current densities of the two reductions suggested that increasing temperature might reduce the significance of P codeposition. This tendency was confirmed by deposition runs carried out at controlled current. Deposition performance was discussed in terms of faradaic yield and deposit properties, namely P content together with the aspect and the structure of the alloys. Use of a continuous or pulsed laser beam was shown to reduce the P content in the deposit at high current densities; in some cases, amorphous structures were replaced by more crystalline forms with assistance of a laser beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003253903124
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  • 3
    Electronic Resource
    Electronic Resource
    Stereoselective distribution of tiaprofenic acid in synovium and cartilage in osteoarthritic patients (1996)
    Springer
    European journal of clinical pharmacology 50 (1996), S. 283-287 
    Details
    ISSN: 1432-1041
    Keywords: Key words Tiaprofenic acid; articular distribution ; synovium ; cartilage ; chiral NSAID
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: In order to document the stereoselective distribution in joints of a chiral nonsteroidal anti-inflammatory drug, the relative affinities of the enantiomers of tiaprofenic acid in synovium and for cartilage were compared. Methods: The distribution of tiaprofenic acid in synovium and in cartilage was studied 25 h after administering the racemic drug for 2 days (600 mg of a sustained-release preparation, once daily), in 12 inpatients with osteoarthritis of the hip requiring arthroplasty. Enantiomers were quantified in plasma and freeze-ground tissues by a chiral HPLC assay. Results: Plasma concentrations of the dextrorotatory (R) enantiomer (0.40 μg/ml) were higher than those of its antipode. The concentration of racemate in synovium (in dried and fresh tissues, 150% and 40%, respectively, of the concentration in plasma) was much higher than that in cartilage (in dried tissues 32% of the plasma concentration). The ratio of the active, dextrorotatory (R) enantiomer to its antipode was higher in synovial tissue than in plasma. Conclusion: Tiaprofenic acid is distributed stereoselectively in plasma and synovium, which contain a higher concentration of the active, dextrorotatory (R) enantiomer. In cartilage, it reaches only a very low concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002280050109
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