Journal of Biological Physics

, Volume 1, Issue 1, pp 36–49 | Cite as

Electrical capacitances of thin lipid films

  • B. Y. Woo
  • L. Y. Wei


Based on the considerations of surface charge and surface recombination (or ion binding), the capacitances of the diffused double layer and the polar region are calculated as functions of ionic strength, pH value and external bias. Electrical capacitances of thin lipid films were measured under various conditions. In all cases, the change in capacitance is not more than 5%. Agreement between theory and experiment is fairly good except for the capacitance-voltage relation. It is concluded that though the magnitude of the observed membrane capacitance is determined by the center hydrocarbon region, its constancy and stability are attributed to the largeness and guarding action of the interface capacitances.


Lipid Polymer Statistical Physic Recombination Hydrocarbon 
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Copyright information

© Physical Biological Sciences Ltd 1973

Authors and Affiliations

  • B. Y. Woo
    • 1
  • L. Y. Wei
    • 1
  1. 1.Electrical Engineering DepartmentUniversity of WaterlooWaterlooCanada

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