The equilibrium penetration of monolayers. III. Complex formation in the sodium docosyl sulfate/hexadecyl-trimethyl-ammonium bromide system

McGregor M.A. and Barnes G.T. (1977) The equilibrium penetration of monolayers. III. Complex formation in the sodium docosyl sulfate/hexadecyl-trimethyl-ammonium bromide system. Journal of Colloid And Interface Science, 62 2: 213-221. doi:10.1016/0021-9797(77)90115-1


Author McGregor M.A.
Barnes G.T.
Title The equilibrium penetration of monolayers. III. Complex formation in the sodium docosyl sulfate/hexadecyl-trimethyl-ammonium bromide system
Journal name Journal of Colloid And Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 1977-01-01
Sub-type Article (original research)
DOI 10.1016/0021-9797(77)90115-1
Open Access Status Not Open Access
Volume 62
Issue 2
Start page 213
End page 221
Total pages 9
Subject 1505 Marketing
1606 Political Science
3110 Surfaces and Interfaces
Abstract Equilibrium surface pressure-area isotherms for sodium docosyl sulfate (NaDS) have been measured on substrates containing various concentrations of hexadecyl-trimethyl-ammonium bromide (CTAB); and from the isotherms, the saturation adsorptions of CTAB for various surface concentrations of NaDS have been calculated. The surface pressure-area data and other results indicate that a complex is formed in the surface consisting of two NaDS molecules for each CTAB molecule. The Gibbs equation has been modified to account for the presence of the complex on the surface, and adsorptions calculated from this equation are somewhat lower than values calculated without allowing for complex formation. The plot of adsorption against the inverse of the area per NaDS molecule is linear, as required by the accessible area theory. This plot yields a value for the adsorption into accessible areas of the surface that corresponds to the adsorption of CTAB at a monolayer-free surface. However, the other parameter derived from the theory, the effective area of a monolayer molecule, corresponds to the area of the 2:1 surface complex rather than the area of a NaDS molecule.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 12 Jul 2016, 10:39:59 EST by System User