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Effect of Plasma Membrane Semipermeability in Making the Membrane Electric Double Layer Capacitances Significant

Electric double layers (or EDLs) formed at the membrane–electrolyte interface (MEI) and membrane–cytosol interface (MCI) of a charged lipid bilayer plasma membrane develop finitely large capacitances. However, these EDL capacitances are often much larger than the intrinsic capacitance of the membrane, and all of these capacitances are in series. Consequently, the effect of these EDL capacitances in dictating the overall membrane–EDL effective capacitance Ceff becomes negligible. In this paper, we challenge this conventional notion pertaining to the membrane–EDL capacitances. We demonstrate that, on the basis of the system parameters, the EDL capacitance for both the permeable and semipermeable membranes can be small enough to influence Ceff. For the semipermeable membranes, however, this lowering of the EDL capacitance can be much larger, ensuring a reduction of Ceff by more than 20–25%. Furthermore, for the semipermeable membranes, the reduction in Ceff is witnessed over a much larger range of system par...

Authors:   Shayandev Sinha; Harnoor Singh Sachar; Siddhartha Das
Journal:   Langmuir
Year:   2018
DOI:   10.1021/acs.langmuir.7b02939
Publication date:   18-Jan-2018
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