Adsorption of hydrophobic polyelectrolytes onto oppositely charged surfaces

被引:28
作者
Borisov, OV
Hakem, F
Vilgis, TA
Joanny, JF
Johner, A
机构
[1] LRMP, UMR 5067, F-64053 Pau, France
[2] Univ Aboubakr Belkaid, Fac Sci, Dept Phys, Tilimsen 13000, Algeria
[3] Max Planck Inst Polymer Res, LEA, ICS, D-55128 Mainz, Germany
[4] Inst Charles Sadron, F-67083 Strasbourg, France
关键词
D O I
10.1007/s101890170026
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present a scaling theory for the adsorption of a weakly charged polyelectrolyte chain in a poor solvent onto an oppositely charged surface. Depending on the fraction of charged monomers and on the solvent quality for uncharged monomers, the globule in the bulk of the solution has either a spherical conformation or a necklace structure. At sufficiently high surface charge density, a chain in the globular conformation adsorbs in a flat pancake conformation due to the Coulombic attraction to the oppositely charged surface. Different adsorption regimes are predicted depending on two screening lengths (the Debye screening length monitored by the salt concentration and the Gouy-Chapman length monitored by the surface charge density), on the degree of ionization of the polymer and on the solvent strength. At low bulk ionic strength, an increase in the surface charge density may induce a transition from an adsorbed necklace structure to a uniform pancake due to the enhanced screening of the intra-chain Coulombic repulsion by the counterions localized near the surface.
引用
收藏
页码:37 / 47
页数:11
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