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Phase Coexistence in a Dynamic Phase Diagram.

Author:
  • Luigi Gentile
  • Luigi Coppola
  • Sandor Balog
  • Kell Mortensen
  • Giuseppe A Ranieri
  • Ulf Olsson
Publishing year: 2015
Language: English
Pages: 2459-2465
Publication/Series: ChemPhysChem
Volume: 16
Issue: 11
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

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.

Keywords

  • Physical Chemistry

Other

Published
  • ISSN: 1439-7641
Luigi Gentile
E-mail: luigi [dot] gentile [at] fkem1 [dot] lu [dot] se

Researcher

MEMEG

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Visiting research fellow

Physical Chemistry

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Research group

Microbial Ecology

Projects

MICCS