Adsorption of hydrophobic polyelectrolytes at oppositely charged surfaces

被引:35
作者
Dobrynin, AV [1 ]
Rubinstein, M [1 ]
机构
[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA
关键词
D O I
10.1021/ma0114943
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We develop a scaling theory of adsorption of necklace-like hydrophobic polyelectrolytes at an oppositely charged hydrophilic and hydrophobic surfaces. At low surface charge densities we predict a two-dimensional adsorbed layer with thickness determined by the balance between electrostatic attraction to the charged surface and chain entropy. At high surface charge densities we expect a 3-dimensional layer with polymer density profile determined either by the balance between two-body monomer-monomer attraction or by electrostatic attraction to the surface and three-body monomer-monomer repulsion. These different stabilizing mechanisms result in the nonmonotonic dependence of the layer thickness on the surface charge density. For adsorption of polyelectrolyte chains from salt solutions the screening of the electrostatic repulsion between adsorbed polyelectrolyte chains results in large overcompensation of the surface charge for two-dimensional adsorbed layers. The polymer surface coverage for this regime increases with increasing salt concentration. The opposite trend is predicted for 3-D adsorbed layers where the polyelectrolyte surface excess decreases with increasing salt concentration.
引用
收藏
页码:2754 / 2768
页数:15
相关论文
共 39 条
[1]   Theory of polymer chains tethered at interfaces [J].
Balazs, AC ;
Singh, C ;
Zhulina, E ;
Chern, SS ;
Lyatskaya, Y ;
Pickett, G .
PROGRESS IN SURFACE SCIENCE, 1997, 55 (03) :181-269
[2]   POLYELECTROLYTE SOLUTIONS BETWEEN CHARGED SURFACES [J].
BORUKHOV, I ;
ANDELMAN, D ;
ORLAND, H .
EUROPHYSICS LETTERS, 1995, 32 (06) :499-504
[3]   Charge distribution on annealed polyelectrolytes [J].
Castelnovo, M ;
Sens, P ;
Joanny, JF .
EUROPEAN PHYSICAL JOURNAL E, 2000, 1 (2-3) :115-125
[4]   Monte Carlo simulations of hydrophobic polyelectrolytes: Evidence of complex configurational transitions [J].
Chodanowski, P ;
Stoll, S .
JOURNAL OF CHEMICAL PHYSICS, 1999, 111 (13) :6069-6081
[5]  
de Gennes P.G., 1979, SCALING CONCEPTS POL
[6]   POLYMER-SOLUTIONS NEAR AN INTERFACE .1. ADSORPTION AND DEPLETION LAYERS [J].
DEGENNES, PG .
MACROMOLECULES, 1981, 14 (06) :1637-1644
[7]   REMARKS ON POLYELECTROLYTE CONFORMATION [J].
DEGENNES, PG ;
PINCUS, P ;
VELASCO, RM ;
BROCHARD, F .
JOURNAL DE PHYSIQUE, 1976, 37 (12) :1461-1473
[8]   Hydrophobic polyelectrolytes [J].
Dobrynin, AV ;
Rubinstein, M .
MACROMOLECULES, 1999, 32 (03) :915-922
[9]   Adsorption of polyelectrolytes at an oppositely charged surface [J].
Dobrynin, AV ;
Deshkovski, A ;
Rubinstein, M .
PHYSICAL REVIEW LETTERS, 2000, 84 (14) :3101-3104
[10]   SCALING THEORY OF POLYELECTROLYTE SOLUTIONS [J].
DOBRYNIN, AV ;
COLBY, RH ;
RUBINSTEIN, M .
MACROMOLECULES, 1995, 28 (06) :1859-1871