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首页> 外文期刊>The European physical journal, E. Soft matter >Elasticity and mechanical instability of charged lipid bilayers in ionic solutions
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Elasticity and mechanical instability of charged lipid bilayers in ionic solutions

机译：离子溶液中带电脂质双层的弹性和机械不稳定性

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We use coarse-grained Monte Carlo simulations to study the elastic properties of charged membranes in solutions of monovalent and pentavalent counterions. The simulation results of the two cases reveal trends opposite to each other. The bending rigidity and projected area increase with the membrane charge density for monovalent counterions, while they decrease for the pentavalent ions. These observations can be related to the counterion screening of the lipid charges. While the monovalent counterions only weakly screen the Coulomb interactions, which implies a repulsive Coulomb system, the multivalent counterions condense on the membrane and, through spatial charge correlations, make the effective interactions due to the charged lipids attractive. The differences in the elastic properties of the charged membranes in monovalent and multivalent counterion solutions are reflected in the mechanisms leading to their mechanical instability at high charge densities. In the former case, the membranes develop pores to relieve the electrostatic tensile stresses, while in the latter case, the membrane exhibits large wavelength bending instability.
机译：我们使用粗糙粒度的蒙特卡洛模拟研究单价和五价抗衡离子溶液中带电膜的弹性。两种情况的仿真结果揭示了彼此相反的趋势。单价抗衡离子的抗弯刚度和投影面积随膜电荷密度的增加而增加，而五价离子则抗弯刚度和投影面积的减小。这些观察结果可能与脂质电荷的抗衡离子筛选有关。虽然单价抗衡离子只能弱化屏蔽库仑相互作用，这意味着排斥的库仑系统，但多价抗衡离子会凝结在膜上，并通过空间电荷相关性，使带电脂质具有有效的相互作用，从而具有吸引力。单价和多价抗衡离子溶液中带电膜的弹性的差异反映在导致其在高电荷密度下机械不稳定性的机制中。在前一种情况下，膜形成孔以减轻静电拉伸应力，而在后一种情况下，膜表现出大的波长弯曲不稳定性。

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