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arXiv 2201.05257cond-mat.softcond-mat.stat-mechphysics.bio-phphysics.chem-ph
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电荷调节脂双层膜的曲率效应

Curvature effects in charge-regulated lipid bilayers

Petch Khunpetch, Arghya Majee, Rudolf Podgornik

摘要:

我们提出了脂双层膜中静电相互作用的理论,其中两个单层小叶都含有受电荷调节的可解离部分。我们专门研究了膜曲率和电荷调节的脂质双层囊泡使用线性Debye-Hückel(DH)和非线性Poisson-Boltzmann(PB)理论之间的耦合。我们发现,电荷调控的其他对称的双层膜可以诱导电荷对称性破缺,非线性挠曲电和自由能的异常曲率依赖。pH值的影响超出了静电重整化膜的机械弹性性能的范例。

英文摘要:

We formulate a theory of electrostatic interactions in lipid bilayer membranes where both monolayer leaflets contain dissociable moieties that are subject to charge regulation. We specifically investigate the coupling between membrane curvature and charge regulation of a lipid bilayer vesicle using both the linear Debye-Hückel (DH) and the non-linear Poisson-Boltzmann (PB) theory. We find that charge regulation of an otherwise symmetric bilayer membrane can induce charge symmetry breaking, non-linear flexoelectricity and anomalous curvature dependence of free energy. The pH effects investigated go beyond the paradigm of electrostatic renormalization of the mechano-elastic properties of membranes.

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