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Ulf Olsson. Portrait.

Ulf Olsson

Professor

Ulf Olsson. Portrait.

Thermal transitions of DODAB vesicular dispersions

Author

  • J Cocquyt
  • Ulf Olsson
  • Gerd Olofsson
  • P Van der Meeren

Summary, in English

Two endothermic transitions, at 36 degrees C and 44 degrees C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium bromide vesicle dispersions that were equilibrated below 15 degrees C while in samples kept at 25 degrees C there was only the transition at 44 degrees C, which was shown to be the gel to liquid-crystalline transition by H-1-NMR measurements. The transition at 36 degrees C was reversed in an exothermic transition around 13 degrees C upon cooling. The slowness of this transition at ambient temperatures suggests that the presence of the transition at 36 degrees C in a DSC upscan depends strongly on the sample history.

Department/s

  • Physical Chemistry

Publishing year

2005

Language

English

Pages

1376-1381

Publication/Series

Colloid and Polymer Science

Volume

283

Issue

12

Document type

Article

Publisher

Springer Science and Business Media B.V.

Topic

  • Physical Chemistry (including Surface- and Colloid Chemistry)

Status

Published

ISBN/ISSN/Other

  • ISSN: 0303-402X