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  • 1
    Electronic Resource
    Electronic Resource
    Wear of metal-containing diamond-like carbon coatings (1996)
    Springer
    Tribology letters 2 (1996), S. 375-380 
    Details
    ISSN: 1573-2711
    Keywords: metal-containing diamond-like carbon ; DLC ; ball-on-disk ; wear rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Four commercial metal-containing DLC coatings were tested with a ball-on-disk tribomete to examine their modes of wear. Although all were sputter-deposited, the coatings differed in their compositions, thicknesses, and surface finish. The tests showed certain common wear modes. In each case the films wore away at constant rates until they were worn through. In this sense, interface adhesion was not an important issue. Since the nominal contact areas increased significantly during the course of the test, while the wear rates were constant, the wear rate was not controlled by the nominal average contact stress. Our data are consistent with the model of Greenwood and Williamson.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156909
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calix[4]Arenes in the partial cone conformation as ionophores in silver ion-selective electrodes (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 311-315 
    Details
    ISSN: 1040-0397
    Keywords: Calix[4]arene ; Partial cone conformation ; Ionophore ; Silver-selective electrode ; Potentiometry ; PVC membrane ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two calix[4]arene derivatives, in the partial cone conformation, with sulfur-containing functionalities, were tested as neutral carrier ionophores in potentiometric silver-selective electrodes of conventional membrane and membrane-coated glassy carbon electrode types. Comparison with a calix[4]arene in the cone conformation was made. The membranes were prepared using either 2-nitrophenyl octyl ether or bis(ethylhexyl)sebacate as plasticizers and potassium tetrakis(p-chlorophenyl)borate as the lipophilic salt in a poly(vinyl chloride) matrix. Both calix[4]arenes yielded electrodes of good sensitivity (approx. 47 mV dec-1) in the range 10-4-10-1 M and excellent selectivity [log KAg,MH+ 〈 -1.5] of transition, alkali and heavy metal cations, including sodium, mercury(II) and lead(II) cations. Temperature effects and reproducibility of response were determined and the interfering effects of mercury(II) and lead (II) ions on the membranes were noted. The partial cone conformation allows improved selectivity over certain cations relative to calix[4]arenes in the cone conformation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090410
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Use of calixarenes as modifiers of carbon paste electrodes for voltammetric analysis (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 97-106 
    Details
    ISSN: 1040-0397
    Keywords: Calixarene ; Modified electrode ; Carbon paste ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of calixarene-based chemically modified carbon paste electrodes (CMCPEs) in voltammetric analysis is reported here. A polymeric calixarene I was incorporated successfully and used for the accumulation of lead (II), copper(II), and mercury(II) ions with subsequent anodic stripping voltammetry as the determination step. The electrode response depended on the calixarene content, the electrolyte, and the preconcentration time and analyte concentration as well as the constituents of the sample matrix. The presence of alkali metal ions in the sample solution was found to have an adverse effect on electrode response, due to the preferable binding of these ions by the calixarene units immobilized in the carbon paste. Attempts to overcome this interference employed a nonpolymeric sulfur-containing calixarene, the thioamide II, in the electrode. The stripping current was not enhanced by introduction of this compound as an electrode modifier, perhaps due to adsorption of the calixarene on the carbon partnicles via its metal ion binding site. However, the application of calixarenes to voltammetric methods of analysis is demonstrated and provides an additional use of calixarenes in electroanalysis.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060205
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    Paper (German National Licenses)
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