Two-component monolayers. III. Evaporation resistances of the octadecanol-docosyl sulphate system

Costin I.S. and Barnes G.T. (1975) Two-component monolayers. III. Evaporation resistances of the octadecanol-docosyl sulphate system. Journal of Colloid And Interface Science, 51 1: 122-132. doi:10.1016/0021-9797(75)90089-2


Author Costin I.S.
Barnes G.T.
Title Two-component monolayers. III. Evaporation resistances of the octadecanol-docosyl sulphate system
Journal name Journal of Colloid And Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 1975-01-01
Sub-type Article (original research)
DOI 10.1016/0021-9797(75)90089-2
Volume 51
Issue 1
Start page 122
End page 132
Total pages 11
Subject 1505 Marketing
1606 Political Science
3110 Surfaces and Interfaces
Abstract The evaporation resistances of monolayers of the octadecanol-docosyl sulphate system have been measured by the Langmuir-Schaefer technique. Eleven different compositions spanning the entire composition range were studied. At surface pressures above 15 mN m-1 evaporation resistances of the mixed monolayers were greater than resistances calculated from the Barnes-La Mer logarithmic addition rule. At lower surface pressures the pattern was more complex, but of special note was a sharp drop in resistance from the high value of a pure octadecanol monolayer to the low values of the various mixtures. These results are discussed in terms of the energy barrier theory and excess free energies of activation (ΔG≠E) are reported. A relationship between these values and the excess free energies of mixing (ΔGE): ΔG≠E = - KΔGE, is established, provided allowance is made for the (unmeasured) contributions of the high area regions of the surface pressure-area isotherms to AGE. When the evaporation resistance data are plotted against molecular area, as suggested by the accessible area theory, all of the points fall roughly on the same curve except for the points for pure octadecanol monolayers. The high resistances of octadecanol are attributed to a low value of the evaporation coefficient.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 14 Jun 2016, 14:09:15 EST by System User