The interplay of the polyelectrolyte-surface electrostatic and non-electrostatic interactions in the polyelectrolytes adsorption onto two charged objects--a self-consistent field study.
The interplay of the polyelectrolyte-surface electrostatic and non-electrostatic interactions in the polyelectrolytes adsorption onto two charged objects--a self-consistent field study.
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DOI：
10.1063/1.4748815
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发表时间：
2012-09
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影响因子：
--
通讯作者：
C. Tong
中科院分区：
文献类型：
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作者：
C. Tong
采用连续自洽场（SCF）理论研究了柔性聚电解质（PE）在两个平行无限长带电柱表面的吸附，并考虑了短程单体-表面非库仑相互作用.由于静电相互作用和表面相互作用之间的复杂的相互作用，非常有趣的PE吸附行为的电荷补偿和桥链构象的程度被发现从SCF方程的数值解。屏蔽增强盐效应和永久吸附的PE，无论盐浓度，出现在存在的单体表面的非静电相互作用。数值结果表明，对于相对较弱的单体-表面相互作用，电荷补偿程度随单体-表面相互作用的增加而减小。数值结果表明，在无盐溶液中，当单体-表面相互作用强度超过脱附-吸附临界值时，在高PE电荷分数区，吸附的PE链的总量与表面电荷密度成线性关系。
The continuum self-consistent field (SCF) theory is applied to the study of the adsorption of flexible polyelectrolytes (PEs) onto the surfaces of two parallel and infinitely long charged columns, taking into account the short-range monomer-surface non-Coulombic interaction. Due to the complex interplay between the electrostatic and surface interactions, very interesting PE adsorption behaviors in terms of the degree of charge compensation and the bridging chain conformation are found from the numerical solution of the SCF equations. The screening-enhanced salt effect and the permanent adsorption of PEs, irrespectively of the salt concentration, emerge in the presence of the monomer-surface non-electrostatic interaction. The numerical results reveal that, for relatively weak monomer-surface interactions, the degree of charge compensation decreases with increasing monomer-surface interaction. Numerical result shows that, for the strength of monomer-surface interaction above the desorption-adsorption critical value and in a salt-free solution, the total amount of the adsorbed PE chains is linearly proportional to the surface charge density in the high PE charge fraction regime.