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Phase Coexistence in a Dynamic Phase Diagram.

Gentile, Luigi LU ; Coppola, Luigi; Balog, Sandor; Mortensen, Kell; Ranieri, Giuseppe A and Olsson, Ulf LU (2015) In ChemPhysChem 16(11). p.2459-2465
Abstract
Metastability and phase coexistence are important concepts in colloidal science. Typically, the phase diagram of colloidal systems is considered at the equilibrium without the presence of an external field. However, several studies have reported phase transition under mechanical deformation. The reason behind phase coexistence under shear flow is not fully understood. Here, multilamellar vesicle (MLV)-to-sponge (L3 ) and MLV-to-Lα transitions upon increasing temperature are detected using flow small-angle neutron scattering techniques. Coexistence of Lα and MLV phases at 40 °C under shear flow is detected by using flow NMR spectroscopy. The unusual rheological behavior observed by studying the lamellar phase of a non-ionic surfactant is... (More)
Metastability and phase coexistence are important concepts in colloidal science. Typically, the phase diagram of colloidal systems is considered at the equilibrium without the presence of an external field. However, several studies have reported phase transition under mechanical deformation. The reason behind phase coexistence under shear flow is not fully understood. Here, multilamellar vesicle (MLV)-to-sponge (L3 ) and MLV-to-Lα transitions upon increasing temperature are detected using flow small-angle neutron scattering techniques. Coexistence of Lα and MLV phases at 40 °C under shear flow is detected by using flow NMR spectroscopy. The unusual rheological behavior observed by studying the lamellar phase of a non-ionic surfactant is explained using (2) H NMR and diffusion flow NMR spectroscopy with the coexistence of planar lamellar-multilamellar vesicles. Moreover, a dynamic phase diagram over a wide range of temperatures is proposed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ChemPhysChem
volume
16
issue
11
pages
2459 - 2465
publisher
John Wiley & Sons
external identifiers
  • pmid:26083451
  • wos:000358538300024
  • scopus:84937969391
ISSN
1439-7641
DOI
10.1002/cphc.201500237
language
English
LU publication?
yes
id
f9af1f27-73aa-47b8-8921-f7bcdf6ccc34 (old id 7485171)
date added to LUP
2015-07-09 13:04:40
date last changed
2017-01-01 03:56:43
@article{f9af1f27-73aa-47b8-8921-f7bcdf6ccc34,
  abstract     = {Metastability and phase coexistence are important concepts in colloidal science. Typically, the phase diagram of colloidal systems is considered at the equilibrium without the presence of an external field. However, several studies have reported phase transition under mechanical deformation. The reason behind phase coexistence under shear flow is not fully understood. Here, multilamellar vesicle (MLV)-to-sponge (L3 ) and MLV-to-Lα transitions upon increasing temperature are detected using flow small-angle neutron scattering techniques. Coexistence of Lα and MLV phases at 40 °C under shear flow is detected by using flow NMR spectroscopy. The unusual rheological behavior observed by studying the lamellar phase of a non-ionic surfactant is explained using (2) H NMR and diffusion flow NMR spectroscopy with the coexistence of planar lamellar-multilamellar vesicles. Moreover, a dynamic phase diagram over a wide range of temperatures is proposed.},
  author       = {Gentile, Luigi and Coppola, Luigi and Balog, Sandor and Mortensen, Kell and Ranieri, Giuseppe A and Olsson, Ulf},
  issn         = {1439-7641},
  language     = {eng},
  number       = {11},
  pages        = {2459--2465},
  publisher    = {John Wiley & Sons},
  series       = {ChemPhysChem},
  title        = {Phase Coexistence in a Dynamic Phase Diagram.},
  url          = {http://dx.doi.org/10.1002/cphc.201500237},
  volume       = {16},
  year         = {2015},
}