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Wear of metal-containing diamond-like carbon coatings (1996)

Harris, Stephen J. ; Weiner, Anita M.

Springer

Tribology letters 2 (1996), S. 375-380

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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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Calix[4]Arenes in the partial cone conformation as ionophores in silver ion-selective electrodes (1997)

O'Connor, Katherine M. ; Henderson, William ; O'Neill, Eva ; [et al.]

Weinheim : Wiley-Blackwell

Electroanalysis 9 (1997), S. 311-315

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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.