Mechano-capacitive properties of polarized membranes

Soft Matter
Lars D MosgaardThomas Heimburg

Abstract

Biological membranes are capacitors that can be charged by applying a field across the membrane. The charges on the capacitor exert a force on the membrane that leads to electrostriction, i.e. a thinning of the membrane. Since the force is quadratic in voltage, negative and positive voltage have an identical influence on the physics of symmetric membranes. However, this is not the case for a membrane with an asymmetry leading to a permanent electric polarization. Positive and negative voltages of identical magnitude lead to different properties. Such an asymmetry can originate from a lipid composition that is different on the two monolayers of the membrane, or from membrane curvature. The latter effect is called 'flexoelectricity'. As a consequence of permanent polarization, the membrane capacitor is discharged at a voltage different from zero. This leads to interesting electrical phenomena such as outward or inward rectification of membrane permeability. Here, we introduce a generalized theoretical framework, that treats capacitance, polarization, flexoelectricity, piezoelectricity and thermoelectricity in the same language. We show applications to electrostriction, membrane permeability and piezoelectricity and thermoelectric...Continue Reading

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Citations

Jun 17, 2018·International Journal for Numerical Methods in Biomedical Engineering·Ilaria CinelliMaeve Duffy
Nov 16, 2018·Biomechanics and Modeling in Mechanobiology·Ilaria CinelliMaeve Duffy
Sep 9, 2017·Scientific Reports·Masayuki IwamotoShigetoshi Oiki
Apr 3, 2020·Electromagnetic Biology and Medicine·Sundeep Singh, Roderick Melnik
Nov 22, 2017·International Journal for Numerical Methods in Biomedical Engineering·I CinelliP McHugh
Feb 13, 2021·Frontiers in Cell and Developmental Biology·Karis Amata Zecchi, Thomas Heimburg
Mar 7, 2021·Biophysical Journal·Paige LiuPeter J Beltramo
Apr 22, 2018·Biochimica Et Biophysica Acta. Biomembranes·Tian WangThomas Heimburg
Nov 24, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Elio J Challita, Eric C Freeman
May 2, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Peter J BeltramoJan Vermant
Nov 9, 2021·Advanced Science·Aditya VasanJames Friend

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