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Phase behavior of cetyltrimethylammonium surfactants with oligo carboxylate counterions mixed with water and decanol: Attraction between charged planes or spheres with oligomeric counterions

Norrman, Jens LU and Piculell, Lennart LU (2007) In The Journal of Physical Chemistry Part B 111(47). p.13364-13370
Abstract
Cetyltrimethylammonium surfactants with a range of oligo carboxylate anions bearing. 2, 3, or 4 negative charges have been synthesized, and their respective behaviors in binary mixtures with water and in ternary mixtures with added decanol have been investigated. In binary mixtures with water, all surfactants formed nearly spherical micelles at high water contents; however, the interactions between micelles varied strongly with the number of charges in the counterion. Micelles with divalent counterions were generally miscible with water, whereas micelles with tri- or tetravalent counterions demixed in one concentrated and one dilute phase. Addition of decanol resulted in all cases in the appearance of a lamellar phase, and all investigated... (More)
Cetyltrimethylammonium surfactants with a range of oligo carboxylate anions bearing. 2, 3, or 4 negative charges have been synthesized, and their respective behaviors in binary mixtures with water and in ternary mixtures with added decanol have been investigated. In binary mixtures with water, all surfactants formed nearly spherical micelles at high water contents; however, the interactions between micelles varied strongly with the number of charges in the counterion. Micelles with divalent counterions were generally miscible with water, whereas micelles with tri- or tetravalent counterions demixed in one concentrated and one dilute phase. Addition of decanol resulted in all cases in the appearance of a lamellar phase, and all investigated oligo carboxylate anions (di-, tri-, and tetravalent) gave rise to a strong attraction between the lamellar planes, resulting in a limited swelling (up to 35-40 wt % water) of the lamellar phase in contact with excess water. These experiments confirm the theoretically predicted influence of aggregate geometry (spheres or planes) on the attraction between colloidal aggregates neutralized by multivalent counterions. Further addition of decanol resulted in the appearance of a second birefringent phase in equilibrium with the lamellar phase. SWAXS showed this phase to be lamellar and to display short-range order that disappeared upon heating, This phase is identified as a lamellar gel phase (L-beta-phase). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
111
issue
47
pages
13364 - 13370
publisher
The American Chemical Society
external identifiers
  • wos:000251140900003
  • scopus:36948999591
ISSN
1520-5207
DOI
10.1021/jp074114+
language
English
LU publication?
yes
id
7417be33-59e7-4c9f-9cd6-dca8846ea861 (old id 969017)
date added to LUP
2008-01-30 07:23:01
date last changed
2017-01-01 07:04:14
@article{7417be33-59e7-4c9f-9cd6-dca8846ea861,
  abstract     = {Cetyltrimethylammonium surfactants with a range of oligo carboxylate anions bearing. 2, 3, or 4 negative charges have been synthesized, and their respective behaviors in binary mixtures with water and in ternary mixtures with added decanol have been investigated. In binary mixtures with water, all surfactants formed nearly spherical micelles at high water contents; however, the interactions between micelles varied strongly with the number of charges in the counterion. Micelles with divalent counterions were generally miscible with water, whereas micelles with tri- or tetravalent counterions demixed in one concentrated and one dilute phase. Addition of decanol resulted in all cases in the appearance of a lamellar phase, and all investigated oligo carboxylate anions (di-, tri-, and tetravalent) gave rise to a strong attraction between the lamellar planes, resulting in a limited swelling (up to 35-40 wt % water) of the lamellar phase in contact with excess water. These experiments confirm the theoretically predicted influence of aggregate geometry (spheres or planes) on the attraction between colloidal aggregates neutralized by multivalent counterions. Further addition of decanol resulted in the appearance of a second birefringent phase in equilibrium with the lamellar phase. SWAXS showed this phase to be lamellar and to display short-range order that disappeared upon heating, This phase is identified as a lamellar gel phase (L-beta-phase).},
  author       = {Norrman, Jens and Piculell, Lennart},
  issn         = {1520-5207},
  language     = {eng},
  number       = {47},
  pages        = {13364--13370},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Phase behavior of cetyltrimethylammonium surfactants with oligo carboxylate counterions mixed with water and decanol: Attraction between charged planes or spheres with oligomeric counterions},
  url          = {http://dx.doi.org/10.1021/jp074114+},
  volume       = {111},
  year         = {2007},
}