THE ADSORPTION OF DINONYLNAPHTHALENESULFONATES ON METAL OXIDE POWDERS

Abstract

The adsorption of oleophilic rust inhibitors, sodium and barium dinonylnaphthalenesulfonate, from cyclohexane solution on Nickel(III) oxide and iron(III) oxide was investigated. Rate data for adsorption of sodium dinonylnaphthalenesulfonate on nickel oxide indicate a complex mechanism of adsorption. An empirical equation was found that accurately describes the data. The log of the uncovered surface plotted against log time was linear. The extrapolated time for 50% coverage was 0.36 min. Experimentally the adsorption process was irreversible. The effect of temperature in the range of 10 to 60C on the adsorption isotherm was negligible. Adsorption isotherm data for sodium dinonylnaphthalenesulfonate were of a Langmuir type. The values of (a) indicated a more close-packed monolayer on nickel oxide than on iron oxide. The ratio of the molecules per square centimeter for the former and the latter was 1.49. The (b) values indicated a rather strong interaction at the metal oxide surfaces. Monolayer concentrations were found to be essentially the same irrespective of the salt used.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 09, 1969
Accession Number
AD0702708

Entities

People

  • Henry Gisser
  • Marco Petronio
  • Paul Kennedy

Organizations

  • Frankford Arsenal

Tags

DTIC Thesaurus Topics

  • Adsorption
  • Chemical Synthesis
  • Chemistry
  • Desorption
  • Equations
  • Films
  • Inhibitors
  • Iron Oxides
  • Isotherms
  • Materials
  • Measurement
  • Metal Oxides
  • Metals
  • Monomolecular Films
  • Organic Chemistry
  • Physical Chemistry
  • Surface Chemistry

Readers

  • Electrochemical Surface Science
  • Regression Analysis.
  • Thin Film Deposition Science.