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A calorimetric study of the gel-to-liquid crystal transition in catanionic surfactant vesicles

Marques, Eduardo LU ; Khan, Ali LU and Lindman, Björn LU (2002) In Thermochimica Acta 394(1-2). p.31-37
Abstract
Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised... (More)
Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised in terms of headgroup electrostatic interactions which may have influence on the chain packing and phase transition temperature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
liquid, gel phase, phase transition, catanionic surfactant, vesicle, electric double-layer forces, crystalline phase
in
Thermochimica Acta
volume
394
issue
1-2
pages
31 - 37
publisher
Elsevier
external identifiers
  • wos:000178635200007
  • scopus:0037137018
ISSN
0040-6031
DOI
10.1016/S0040-6031(02)00235-6
language
English
LU publication?
yes
id
1ecc9521-d469-4c9a-a42c-c1101f351f78 (old id 325114)
date added to LUP
2007-11-02 11:01:46
date last changed
2017-10-22 04:30:15
@article{1ecc9521-d469-4c9a-a42c-c1101f351f78,
  abstract     = {Dilute solutions of catanionic vesicles formed by the mixed single-chained (sodium dodecylsulphate, SDS) and double-chained (didodecyldimethylammonium bromide, DDAB) surfactants have been investigated by differential scanning calorimetry. It is for the first time reported a gel-to-liquid crystal phase transition temperature, T-m, in this type of mixed vesicles. The SDS-rich vesicles (at X-SDS = 0.71) show a concentration-dependent T-m in the range 9-16 degreesC. Addition of salt is seen to have an effect on T-m similar to that observed with increasing surfactant concentration, both inducing a decrease in T-m. These results differ from those obtained for neat DDAB vesicles. The observed effects in the two types of vesicles are rationalised in terms of headgroup electrostatic interactions which may have influence on the chain packing and phase transition temperature.},
  author       = {Marques, Eduardo and Khan, Ali and Lindman, Björn},
  issn         = {0040-6031},
  keyword      = {liquid,gel phase,phase transition,catanionic surfactant,vesicle,electric double-layer forces,crystalline phase},
  language     = {eng},
  number       = {1-2},
  pages        = {31--37},
  publisher    = {Elsevier},
  series       = {Thermochimica Acta},
  title        = {A calorimetric study of the gel-to-liquid crystal transition in catanionic surfactant vesicles},
  url          = {http://dx.doi.org/10.1016/S0040-6031(02)00235-6},
  volume       = {394},
  year         = {2002},
}