Search: id:"swepub:oai:DiVA.org:kth-37033" >
Counterion and surf...
Counterion and surface density dependence of the adsorption layer of ionic surfactants at the vapor-aqueous solution interface : A computer simulation study
- Article/chapterEnglish2007
Publisher, publication year, extent ...
-
2007-01-31
-
American Chemical Society (ACS),2007
-
printrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:kth-37033
-
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37033URI
-
https://doi.org/10.1021/jp066969cDOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
To test the validity of currently used adsorption theories and understand the origin of the lack of their ability of adequately describing existing surface tension measurement data, we have performed a series of molecular dynamics simulations of the adsorption layer of alkali decyl sulfate at the vapor/aqueous solution interface. The simulations have been performed with five different cations (i.e., Li(+), Na(+), K(+), Rb(+), and Cs(+)) at two different surface concentrations (i.e., 2 mu mol/m(2) and 4 mu mol/m(2)). The obtained results clearly show that the thickness of the outer Helmholtz plate, a key quantity of the various adsorption theories, depends on two parameters, that is, the size of the cations and the surface density of the anionic surfactant. Namely, with increasing surface concentration, the electrostatic attraction between the two, oppositely charged, layers becomes stronger, leading to a considerable shrinking of the outer Helmholtz plate. Furthermore, this layer is found to be thicker in the presence of larger cations. The former effect could be important in understanding the anomalous shape of the adsorption isotherms of alkali alkyl sulfate surfactants, while the second effect seems to be essential in explaining the cation specificity of these isotherms.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Partay, Livia B.
(author)
-
Varga, ImreKTH,Kemi(Swepub:kth)u1626uun
(author)
-
Jedlovszky, Pal
(author)
-
Gilanyi, Tibor
(author)
-
KTHKemi
(creator_code:org_t)
Related titles
-
In:Journal of Physical Chemistry B: American Chemical Society (ACS)111:7, s. 1769-17741520-61061520-5207
Internet link
Find in a library
To the university's database