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A SANS contrast variation study of microemulsion droplet growth

Balogh, Joakim LU ; Olsson, Ulf LU and Pedersen, Jan Skov (2007) In The Journal of Physical Chemistry Part B 111(4). p.682-689
Abstract
An extensive small angle neutron scattering study is presented using contrast variation on the growth of nonionic microemulsion droplets as the temperature and thus spontaneous curvature is varied away from the emulsification failure boundary, EFB, toward zero spontaneous curvature. Two ternary systems are compared. They only differ by the chain length of the oil ( decane and hexadecane, respectively). Droplets grow in size as one moves away from the EFB. SANS data from ten different contrasts were fitted simultaneously with a model of polydisperse prolate shaped droplets interacting with an effectively hard sphere potential, and the data set further included three different droplet concentrations and four different temperatures. The model... (More)
An extensive small angle neutron scattering study is presented using contrast variation on the growth of nonionic microemulsion droplets as the temperature and thus spontaneous curvature is varied away from the emulsification failure boundary, EFB, toward zero spontaneous curvature. Two ternary systems are compared. They only differ by the chain length of the oil ( decane and hexadecane, respectively). Droplets grow in size as one moves away from the EFB. SANS data from ten different contrasts were fitted simultaneously with a model of polydisperse prolate shaped droplets interacting with an effectively hard sphere potential, and the data set further included three different droplet concentrations and four different temperatures. The model of prolates provided a good description of the data. The prolate axial ratio, obtained from the fits, increased with increasing temperature but showed only a minor variation with the droplet concentration. The two systems with different oils behave quantitatively different. In both systems, however, the droplet growth is only minor, with maximum axial ratios of about 3-4, before a bicontinuous microemulsion is formed. (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
4
pages
682 - 689
publisher
The American Chemical Society
external identifiers
  • wos:000243705800002
  • scopus:33847050228
ISSN
1520-5207
DOI
10.1021/jp0660031
language
English
LU publication?
yes
id
e9f8ace8-5652-4f89-9231-0a95f499d571 (old id 676123)
date added to LUP
2007-12-07 13:59:33
date last changed
2017-08-20 04:29:45
@article{e9f8ace8-5652-4f89-9231-0a95f499d571,
  abstract     = {An extensive small angle neutron scattering study is presented using contrast variation on the growth of nonionic microemulsion droplets as the temperature and thus spontaneous curvature is varied away from the emulsification failure boundary, EFB, toward zero spontaneous curvature. Two ternary systems are compared. They only differ by the chain length of the oil ( decane and hexadecane, respectively). Droplets grow in size as one moves away from the EFB. SANS data from ten different contrasts were fitted simultaneously with a model of polydisperse prolate shaped droplets interacting with an effectively hard sphere potential, and the data set further included three different droplet concentrations and four different temperatures. The model of prolates provided a good description of the data. The prolate axial ratio, obtained from the fits, increased with increasing temperature but showed only a minor variation with the droplet concentration. The two systems with different oils behave quantitatively different. In both systems, however, the droplet growth is only minor, with maximum axial ratios of about 3-4, before a bicontinuous microemulsion is formed.},
  author       = {Balogh, Joakim and Olsson, Ulf and Pedersen, Jan Skov},
  issn         = {1520-5207},
  language     = {eng},
  number       = {4},
  pages        = {682--689},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {A SANS contrast variation study of microemulsion droplet growth},
  url          = {http://dx.doi.org/10.1021/jp0660031},
  volume       = {111},
  year         = {2007},
}