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  • Chemistry  (2)
  • ozone  (1)
  • Inorganic Chemistry
  • Quantum optics, physics of lasers, nonlinear optics, classical optics
  • 1985-1989  (3)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Measurements of the degree of dissociation in oxygen DC discharges: Comparison of the ozone method with the Wrede-Harteck method (1985)
    Springer
    Plasma chemistry and plasma processing 5 (1985), S. 67-79 
    Details
    ISSN: 1572-8986
    Keywords: Oxygen discharge ; degree of dissociation ; ozone ; Wrede-Harteck method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The degree of dissociation of oxygen has been measured in the positive column plasma of a glow discharge by two different methods (the ozone method and the Wrede-Harteck method). The results of both methods are in a good agreement. The pressure was varied from 66 to 266 Pa, the discharge current from 4 to 100 mA, and the discharge tube was of 2.0 cm inside diameter. As expected, the degree of dissociation increases with increasing discharge current and decreases with increasing pressure. Calculations of the degree of dissociation show that the main loss process of the oxygen atoms is caused by the recombination on the wall of the discharge tube for pressures up to several 100 Pa. We found that the value of the recombination coefficient for the glass wall of the discharge tube (γ≈4.6·10−4) is about a factor 2 larger than that for a tube outside of the discharge (γ≈2.2·10−4). Ozone processes, including metastable oxygen molecules, have increasing influence on the balance of the oxygen atoms as the pressure increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567910
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  • 2
    Electronic Resource
    Electronic Resource
    An approach for estimating the permeation of phosphonofluoridates into a high polymer matrix part 1. Development of the approach (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1338-1343 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An approach has been developed to estimate the solubility and diffusivity of toxic phosphonofluoridates in high molecular weight polymeric matrices based upon experimentation with nontoxic simulants. This approach is based on Gee's relation for estimating solubility (equilibrium swelling) from knowledge of the solubility parameters for the polymer and the simulant liquids concerned and on Van Krevelen's relation between diffusivity and activation energy of diffusion. The latter is interpolated from a standard plot of activation energy of diffusion against penetrant molar volume. Equilibrium swelling values and diffusivities for toxic alkyl phosphonofluoridates in styrene-butadiene rubber (SBR) and low density polyethylene (LDPE) were estimated from results of swelling measurements (as a function of time and at three different temperatures) involving the two polymers and a series of nontoxic liquids, similar to the toxic alkyl phosphonofluoridates.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271711
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of permeation of organic solvents through PVC, asbestos/cement, and ductile iron pipes (1987)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 9 (1987), S. 114-118 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Buried potable waterpipes are susceptible to permeation by organic solvents. In studying piping made of PVC, asbestos/cement, and ductile iron, full-pipe assemblies and laboratory bench techniques were employed. Elastomeric gaskets for all three systems become permeated, at least under exaggerated conditions. Results show that thermodynamic activity, as opposed to concentration, is the driving force. At solvent activities well above those encountered in typical soil, PVC is seen to be an effective barrier against permeation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730090306
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