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Emulsion Ripening through Molecular Exchange at Droplet Contacts.

Roger, Kevin; Olsson, Ulf LU ; Schweins, Ralf and Cabane, Bernard (2015) In Angewandte Chemie (International edition) 54(5). p.1452-1455
Abstract
Two coarsening mechanisms of emulsions are well established: droplet coalescence (fusion of two droplets) and Ostwald ripening (molecular exchange through the continuous phase). Here a third mechanism is identified, contact ripening, which operates through molecular exchange upon droplets collisions. A contrast manipulated small-angle neutron scattering experiment was performed to isolate contact ripening from coalescence and Ostwald ripening. A kinetic study was conducted, using dynamic light scattering and monodisperse nanoemulsions, to obtain the exchange key parameters. Decreasing the concentration or adding ionic repulsions between droplets hinders contact ripening by decreasing the collision frequency. Using long surfactant chains... (More)
Two coarsening mechanisms of emulsions are well established: droplet coalescence (fusion of two droplets) and Ostwald ripening (molecular exchange through the continuous phase). Here a third mechanism is identified, contact ripening, which operates through molecular exchange upon droplets collisions. A contrast manipulated small-angle neutron scattering experiment was performed to isolate contact ripening from coalescence and Ostwald ripening. A kinetic study was conducted, using dynamic light scattering and monodisperse nanoemulsions, to obtain the exchange key parameters. Decreasing the concentration or adding ionic repulsions between droplets hinders contact ripening by decreasing the collision frequency. Using long surfactant chains and well-hydrated heads inhibits contact ripening by hindering fluctuations in the film. Contact ripening can be controlled by these parameters, which is essential for both emulsion formulation and delivery of hydrophobic ingredients. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Angewandte Chemie (International edition)
volume
54
issue
5
pages
1452 - 1455
publisher
John Wiley & Sons
external identifiers
  • pmid:25504340
  • wos:000348713900005
  • scopus:85027951884
ISSN
1521-3773
DOI
10.1002/anie.201407858
language
English
LU publication?
yes
id
92a97bc6-f8e5-42cf-8fd3-6f4cf6b03531 (old id 4908390)
date added to LUP
2015-01-13 17:03:10
date last changed
2017-10-01 03:20:14
@article{92a97bc6-f8e5-42cf-8fd3-6f4cf6b03531,
  abstract     = {Two coarsening mechanisms of emulsions are well established: droplet coalescence (fusion of two droplets) and Ostwald ripening (molecular exchange through the continuous phase). Here a third mechanism is identified, contact ripening, which operates through molecular exchange upon droplets collisions. A contrast manipulated small-angle neutron scattering experiment was performed to isolate contact ripening from coalescence and Ostwald ripening. A kinetic study was conducted, using dynamic light scattering and monodisperse nanoemulsions, to obtain the exchange key parameters. Decreasing the concentration or adding ionic repulsions between droplets hinders contact ripening by decreasing the collision frequency. Using long surfactant chains and well-hydrated heads inhibits contact ripening by hindering fluctuations in the film. Contact ripening can be controlled by these parameters, which is essential for both emulsion formulation and delivery of hydrophobic ingredients.},
  author       = {Roger, Kevin and Olsson, Ulf and Schweins, Ralf and Cabane, Bernard},
  issn         = {1521-3773},
  language     = {eng},
  number       = {5},
  pages        = {1452--1455},
  publisher    = {John Wiley & Sons},
  series       = {Angewandte Chemie (International edition)},
  title        = {Emulsion Ripening through Molecular Exchange at Droplet Contacts.},
  url          = {http://dx.doi.org/10.1002/anie.201407858},
  volume       = {54},
  year         = {2015},
}