Structural relaxations of phospholipids and water in planar membranes
Journal article, 2009

We have used dielectric spectroscopy and temperature modulated differential scanning calorimetry TMDSC to investigate the structural relaxation processes and phase transitions of water and lipids in multilamellar, planar phospholipids. At low hydration levels we observe the main structural relaxation related to the glass transition of the phospholipids. With increasing water content a more pronounced pretransition, attributed to a gel to ripple phase transition, is observed in the TMDSC data. In the proximity of this pretransition, a distinct change in the temperature dependence or alternatively a bifurcation into two processes is observed in the dielectric data. Around this temperature a crossover in the long-range ionic conductivity across the membranes is also observed, which is one of the key parameters for biological membranes. Thus, the major dynamical changes do not occur at the main, i.e., the gel to liquid structural phase transition, but at a pretransition that occurs roughly 20 K below the main transition.


Christer Svanberg

Chalmers, Applied Physics, Condensed Matter Physics

Peter Berntsen

Chalmers, Applied Physics, Condensed Matter Physics

Andreas Johansson


Therese A Hedlund

Chalmers, Applied Physics

Erika Axén

Chalmers, Applied Physics

Jan Swenson

Chalmers, Applied Physics, Condensed Matter Physics

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 130 3 035101- 035101

Subject Categories

Physical Sciences

Condensed Matter Physics



More information

Latest update