Flexoelectricity and thermal fluctuations of lipid bilayer membranes: Renormalization of flexoelectric, dielectric, and elastic properties
Flexoelectricity and thermal fluctuations of lipid bilayer membranes: Renormalization of flexoelectric, dielectric, and elastic properties
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DOI：
10.1103/physreve.87.032715
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发表时间：
2013-03
影响因子：
2.4
通讯作者：
Liping Liu;P. Sharma
中科院分区：
文献类型：
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作者：
Liping Liu;P. Sharma
热波动使脂质双层的弯曲弹性重新正常化。这种被充分研究的效应是研究几种膜生物物理现象的基石。类似地，几乎所有的膜都被赋予了一种称为挠曲电性的机电耦合，这种耦合允许膜由于曲率的变化而极化。柔性电被发现在许多生物功能中很重要，包括听力、离子传输以及在某些需要机械转导的情况下。人们对热波动和挠性电之间的相互作用知之甚少。在这项工作中，我们探索了表观挠曲电性如何因热涨落而改变，以及弹性和介电性质如何因挠曲电性而重整化。我们发现表观弯曲刚度因弯曲电性而软化，并讨论了其对解释现有实验工作的影响。
Thermal fluctuations renormalize the bending elasticity of lipid bilayers. This well-studied effect is a cornerstone in the study of several membrane biophysical phenomena. Analogously, nearly all membranes are endowed with an electromechanical coupling called flexoelectricity that admits membrane polarization due to curvature changes. Flexoelectricity is found to be important in a number of biological functions including hearing, ion transport and in some situations where mechanotransduction is necessary. Very little is known about the interplay between thermal fluctuations and flexoelectricity. In this work, we explore how the apparent flexoelectricity is altered due to thermal fluctuations, and further, how the elastic and dielectric properties are renormalized due to flexoelectricity. We find that the apparent bending rigidity is softened by flexoelectricity and discuss the ramifications for interpreting existing experimental work.