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Vesicle formation from temperature jumps in a nonionic surfactant system

Bryskhe, Karin LU ; Bulut, Sanja LU and Olsson, Ulf LU (2005) In The Journal of Physical Chemistry Part B 109(19). p.9265-9274
Abstract
When heating a dilute sample of the binary system of tetraethyleneglycol dodecyl ether (C12E4) and water from the micellar phase (L-1) into the two-phase region of a lamellar phase (L-alpha) and excess water (W) vesicles are formed. During heating, one passes a region of phase separation in the micellar phase (L-1' + L-1") where the initial micelles rapidly fuse into larger aggregates forming the concentrated L-1 phase (L-1") with a structure of branched cylindrical micelles, a so-called "living network". The static correlation length of the micelles are increasing with increasing concentration, from ca. 10 nm to 80 nm in the concentration range of 0.0001 g/cm(3)-0.0035 g/cm(3). The overlap concentration was determined to 0.0035 g/cm(3).... (More)
When heating a dilute sample of the binary system of tetraethyleneglycol dodecyl ether (C12E4) and water from the micellar phase (L-1) into the two-phase region of a lamellar phase (L-alpha) and excess water (W) vesicles are formed. During heating, one passes a region of phase separation in the micellar phase (L-1' + L-1") where the initial micelles rapidly fuse into larger aggregates forming the concentrated L-1 phase (L-1") with a structure of branched cylindrical micelles, a so-called "living network". The static correlation length of the micelles are increasing with increasing concentration, from ca. 10 nm to 80 nm in the concentration range of 0.0001 g/cm(3)-0.0035 g/cm(3). The overlap concentration was determined to 0.0035 g/cm(3). When the temperature reaches the L-1' + L-alpha region the network particles transform into bilayer vesicles with a z-average apparent hydrodynamic radius in the order of 200 nm depending on the composition. The size of the final vesicles depends on the extent of aggregation/fusion in the L-1' + L-1" region and hence on the rate of heating. The aggregation/fusion in the L-1' + L-1" is slower than diffusion-limited aggregation, and it is shown that 1/100 of the collisions are sticky results in the fusion event. (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
109
issue
19
pages
9265 - 9274
publisher
The American Chemical Society
external identifiers
  • wos:000229134000012
  • scopus:19844374258
ISSN
1520-5207
DOI
10.1021/jp045244a
language
English
LU publication?
yes
id
b23bd84e-7076-4e1d-97f6-070c7c1f9b28 (old id 157223)
date added to LUP
2007-07-11 08:17:21
date last changed
2017-10-29 04:19:33
@article{b23bd84e-7076-4e1d-97f6-070c7c1f9b28,
  abstract     = {When heating a dilute sample of the binary system of tetraethyleneglycol dodecyl ether (C12E4) and water from the micellar phase (L-1) into the two-phase region of a lamellar phase (L-alpha) and excess water (W) vesicles are formed. During heating, one passes a region of phase separation in the micellar phase (L-1' + L-1") where the initial micelles rapidly fuse into larger aggregates forming the concentrated L-1 phase (L-1") with a structure of branched cylindrical micelles, a so-called "living network". The static correlation length of the micelles are increasing with increasing concentration, from ca. 10 nm to 80 nm in the concentration range of 0.0001 g/cm(3)-0.0035 g/cm(3). The overlap concentration was determined to 0.0035 g/cm(3). When the temperature reaches the L-1' + L-alpha region the network particles transform into bilayer vesicles with a z-average apparent hydrodynamic radius in the order of 200 nm depending on the composition. The size of the final vesicles depends on the extent of aggregation/fusion in the L-1' + L-1" region and hence on the rate of heating. The aggregation/fusion in the L-1' + L-1" is slower than diffusion-limited aggregation, and it is shown that 1/100 of the collisions are sticky results in the fusion event.},
  author       = {Bryskhe, Karin and Bulut, Sanja and Olsson, Ulf},
  issn         = {1520-5207},
  language     = {eng},
  number       = {19},
  pages        = {9265--9274},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Vesicle formation from temperature jumps in a nonionic surfactant system},
  url          = {http://dx.doi.org/10.1021/jp045244a},
  volume       = {109},
  year         = {2005},
}