Theory of dielectric response of charged-bilayer-vesicle solutions
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK
Accepted: 15 September 1996
The dielectric response is calculated for a solution containing charged bilayer vesicles and simple electrolyte. The solution is assumed to contain a high salt concentration so that the Debye screening length is small compared to the size of the vesicles. The presence of two (electric) double layers, one on each side of the bilayer, gives low-frequency salt relaxations (kHz for vesicles) that explain the experimentally observed α relaxations which are known to appear only for charged vesicles. The double layers also modify the high-frequency β relaxations which have been previously modeled by using the Maxwell-Wagner theory. The calculation method can be easily extended to other bilayer geometries.
PACS: 77.22.Gm – Dielectric loss and relaxation / 77.84.Nh – Liquids, emulsions, and suspensions; liquid crystals / 87.22.Bt – Membranes and subcellular physics and structure
© EDP Sciences, 1996