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首页> 外文期刊>The Journal of Chemical Physics >On the charge overcompensation of quenched polyelectrolyte stars electrostatically adsorbed onto a quenched oppositely charged planar surface
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On the charge overcompensation of quenched polyelectrolyte stars electrostatically adsorbed onto a quenched oppositely charged planar surface

机译：关于带电补偿的淬灭的聚电解质星静电吸附在带淬灭的相反电荷的平面上

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摘要

We present numerical self-consistent field calculations in a two-gradient cylindrical coordinate system for a (translationally restricted) quenched polyelectrolyrte star which is electrostatically attracted to an oppositely charged surface with homogeneous surface charge density at a given ionic strength of a 1:1 electrolyte. The results prove that without any additional driving force for adsorption, electrostatic attraction alone can give significant overcompensation of the surface charge provided that the ionic strength is below some critical value. This is demonstrated for the case that the charge density on the surface is lower than the (projected) charge density in the star. In the regime of charge overcompensation, the thickness of the adsorbed layer is of the order of the star size in solution. The adsorbed layer is laterally inhomogeneous and the outer part of the adsorption profile is locally neutralized by the small counterions.
机译：我们提出了在两个梯度圆柱坐标系中的数值自洽场计算，用于（平移受限）淬灭的聚电解质星，该星在给定的离子强度为1：1的电解质中被静电吸引到具有均匀表面电荷密度的相反电荷的表面。结果证明，如果离子强度低于某个临界值，则仅靠静电吸引就可以明显补偿表面电荷，而无需任何额外的吸附驱动力。对于表面上的电荷密度低于恒星中（投影的）电荷密度的情况，可以证明这一点。在电荷过度补偿的情况下，吸附层的厚度约为溶液中星形的大小。吸附层在横向上是不均匀的，并且吸附分布的外部被小抗衡离子局部中和。

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