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Spontaneous vesicle formation in a block copolymer system

Bryskhe, Karin LU ; Jansson, Jörgen LU ; Topgaard, Daniel LU ; Schillén, Karin LU and Olsson, Ulf LU (2004) In The Journal of Physical Chemistry Part B 108(28). p.9710-9719
Abstract
We have investigated the formation of vesicles in the binary system of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) with the average composition EO5PO68EO5 in water. Vesicles are formed when a solution of unimers is heated into a two-phase region where, at equilibrium, a concentrated lamellar phase coexists with a dilute solution of unimers. The vesicles were characterized by cryo-TEM, static and dynamic light scattering, and NMR experiments. The average vesicle radius is approximately 60 nm, with an exponential size distribution, and the concentration of vesicles depends strongly on the temperature. The vesicles remain stationary on the time scale of hours. A striking observation is that, on this time... (More)
We have investigated the formation of vesicles in the binary system of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) with the average composition EO5PO68EO5 in water. Vesicles are formed when a solution of unimers is heated into a two-phase region where, at equilibrium, a concentrated lamellar phase coexists with a dilute solution of unimers. The vesicles were characterized by cryo-TEM, static and dynamic light scattering, and NMR experiments. The average vesicle radius is approximately 60 nm, with an exponential size distribution, and the concentration of vesicles depends strongly on the temperature. The vesicles remain stationary on the time scale of hours. A striking observation is that, on this time scale, both the vesicle size distribution and the concentration of vesicles are reversible with respect to temperature cycles. However, on the time scale of weeks a sedimentation is observed in the solutions. (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
108
issue
28
pages
9710 - 9719
publisher
The American Chemical Society
external identifiers
  • wos:000222639900026
  • scopus:3442887370
ISSN
1520-5207
DOI
10.1021/jp031313u
language
English
LU publication?
yes
id
2dd4ae19-8c5b-4133-9cfa-a43b78a46618 (old id 153994)
date added to LUP
2007-07-11 08:14:24
date last changed
2017-07-02 04:17:17
@article{2dd4ae19-8c5b-4133-9cfa-a43b78a46618,
  abstract     = {We have investigated the formation of vesicles in the binary system of a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) with the average composition EO5PO68EO5 in water. Vesicles are formed when a solution of unimers is heated into a two-phase region where, at equilibrium, a concentrated lamellar phase coexists with a dilute solution of unimers. The vesicles were characterized by cryo-TEM, static and dynamic light scattering, and NMR experiments. The average vesicle radius is approximately 60 nm, with an exponential size distribution, and the concentration of vesicles depends strongly on the temperature. The vesicles remain stationary on the time scale of hours. A striking observation is that, on this time scale, both the vesicle size distribution and the concentration of vesicles are reversible with respect to temperature cycles. However, on the time scale of weeks a sedimentation is observed in the solutions.},
  author       = {Bryskhe, Karin and Jansson, Jörgen and Topgaard, Daniel and Schillén, Karin and Olsson, Ulf},
  issn         = {1520-5207},
  language     = {eng},
  number       = {28},
  pages        = {9710--9719},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Spontaneous vesicle formation in a block copolymer system},
  url          = {http://dx.doi.org/10.1021/jp031313u},
  volume       = {108},
  year         = {2004},
}