Two-component monolayers. II. Surface pressure-area relations for the octadecanol-docosyl sulphate system

Costin I.S. and Barnes G.T. (1975) Two-component monolayers. II. Surface pressure-area relations for the octadecanol-docosyl sulphate system. Journal of Colloid And Interface Science, 51 1: 106-121. doi:10.1016/0021-9797(75)90088-0


Author Costin I.S.
Barnes G.T.
Title Two-component monolayers. II. Surface pressure-area relations for 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
Sub-type Article (original research)
DOI 10.1016/0021-9797(75)90088-0
Volume 51
Issue 1
Start page 106
End page 121
Total pages 16
Subject 1505 Marketing
1606 Political Science
3110 Surfaces and Interfaces
Abstract Surface pressure-area isotherms are reported for monolayers of octadecanol and docosyl sulphate and their mixtures on substrates of 0.1 M KCl at 298.3 K. Eleven different compositions spanning the whole composition range were investigated. At all compositions and at all surface pressures the monolayer areas are less than the added areas of the two pure components. The area-composition plots show three distinct regions: alcohol-rich (xA > 0.6), intermediate, and sulphate-rich (xA < 0.18); and partial molecular areas of alcohol and of sulphate have been determined for each region. The theory of Fowkes has been applied to the data and the system shown to be nonideal in the terms of this theory. Excess free energies of mixing have been calculated by the method of Goodrich. Values ranging from zero to -600 J mole-1 were obtained. The contributions of the high area portions of the II-Â isotherms were not included in these calculations, but estimates of these contributions have been made from the evaporation resistance data reported in Part III and values between -60 and -200 J mole-1 were found.
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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