多价Gibbs-Donnan平衡中的结合效应
Binding effects in multivalent Gibbs-Donnan equilibrium
摘要：
经典的吉布斯-唐南平衡描述了与嵌入电解质溶液中的受限胶体电荷相关的过量渗透压。在这项工作中，我们扩展这种方法来描述多价离子结合的平衡力的影响，作用于带电杆易位之间的两个隔间，从而模仿在体外从噬菌体DNA弹射力平衡的离子效应。Gibbs-Donnan平衡和吸附平衡之间的微妙的相互作用，导致一个非单调变化的喷射力作为多价盐浓度的增加，在定性与实验观察。
英文摘要：
The classical Gibbs-Donnan equilibrium describes excess osmotic pressure associated with confined colloidal charges embedded in an electrolyte solution. In this work, we extend this approach to describe the influence of multivalent ion binding on the equilibrium force acting on a charged rod translocating between two compartments, thereby mimicking ionic effects on force balance during in vitro DNA ejection from bacteriophage. The subtle interplay between Gibbs-Donnan equilibrium and adsorption equilibrium leads to a non-monotonic variation of the ejection force as multivalent salt concentration is increased, in qualitative agreement with experimental observations.
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