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A didodecyldimethylammonium bromide ternary system: Characterization of three-phase stable emulsions by optical microscopy

Mele, S; Khan, Ali LU and Monduzzi, M (2002) In Journal of Surfactants and Detergents 5(4). p.381-389
Abstract
A preliminary characterization of the didodecyldimethyl ammonium bromide (DDAB)/water (W)/per fluorooctane (PFO) ternary system at 25 degreesC is presented. The gradual addition of water, followed by mixing, to DDAB/PFO mixtures produces very stable emulsions for water contents greater than 20 wt%. On the basis of macroscopic observation, at least four different types of emulsions form up to a water content of around 97 wt%. On the basis of high conductivity values, a water-continuous domain is suggested at all compositions. A second phase diagram, considerably different in phase boundaries, is obtained by adding the PFO oil to DDAB/W samples. This allowed us to ascertain the swelling properties of L-alpha1 and L-alpha2 lamellar phases.... (More)
A preliminary characterization of the didodecyldimethyl ammonium bromide (DDAB)/water (W)/per fluorooctane (PFO) ternary system at 25 degreesC is presented. The gradual addition of water, followed by mixing, to DDAB/PFO mixtures produces very stable emulsions for water contents greater than 20 wt%. On the basis of macroscopic observation, at least four different types of emulsions form up to a water content of around 97 wt%. On the basis of high conductivity values, a water-continuous domain is suggested at all compositions. A second phase diagram, considerably different in phase boundaries, is obtained by adding the PFO oil to DDAB/W samples. This allowed us to ascertain the swelling properties of L-alpha1 and L-alpha2 lamellar phases. Optical microscopy in the presence and in the absence of polarized light revealed the formation of lamellar liquid crystals either as randomly localized islands or as rings surrounding the oil droplets. Vesicles are identified at high water content. The contemporaneous presence of both L-alpha1 and L-alpha2 lamellar phases causes a synergistic effect in the PFO stabilization. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
three-phase emulsions, DDAB, optical microscopy
in
Journal of Surfactants and Detergents
volume
5
issue
4
pages
381 - 389
publisher
Springer
external identifiers
  • wos:000178780100008
  • scopus:0036801701
ISSN
1097-3958
DOI
10.1007/s11743-002-0237-6
language
English
LU publication?
yes
id
ea2c843d-0029-4a2c-9260-1cf5d2ef198f (old id 324920)
date added to LUP
2007-11-02 11:47:18
date last changed
2017-01-01 06:59:49
@article{ea2c843d-0029-4a2c-9260-1cf5d2ef198f,
  abstract     = {A preliminary characterization of the didodecyldimethyl ammonium bromide (DDAB)/water (W)/per fluorooctane (PFO) ternary system at 25 degreesC is presented. The gradual addition of water, followed by mixing, to DDAB/PFO mixtures produces very stable emulsions for water contents greater than 20 wt%. On the basis of macroscopic observation, at least four different types of emulsions form up to a water content of around 97 wt%. On the basis of high conductivity values, a water-continuous domain is suggested at all compositions. A second phase diagram, considerably different in phase boundaries, is obtained by adding the PFO oil to DDAB/W samples. This allowed us to ascertain the swelling properties of L-alpha1 and L-alpha2 lamellar phases. Optical microscopy in the presence and in the absence of polarized light revealed the formation of lamellar liquid crystals either as randomly localized islands or as rings surrounding the oil droplets. Vesicles are identified at high water content. The contemporaneous presence of both L-alpha1 and L-alpha2 lamellar phases causes a synergistic effect in the PFO stabilization.},
  author       = {Mele, S and Khan, Ali and Monduzzi, M},
  issn         = {1097-3958},
  keyword      = {three-phase emulsions,DDAB,optical microscopy},
  language     = {eng},
  number       = {4},
  pages        = {381--389},
  publisher    = {Springer},
  series       = {Journal of Surfactants and Detergents},
  title        = {A didodecyldimethylammonium bromide ternary system: Characterization of three-phase stable emulsions by optical microscopy},
  url          = {http://dx.doi.org/10.1007/s11743-002-0237-6},
  volume       = {5},
  year         = {2002},
}