.png){kind=icon}
返回
Effective interactions between solid particles mediated by free polymer in solution
.png){kind=icon}
PRE
AI
DOI：10.1063/1.4816469.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Effective potentials of interaction between solid non-adsorbing surfaces in semidilute or concentrated polymer solutions are calculated using two approaches: the numerical self-consistent-field theory (SCFT) and the analytical theory generalizing the ground-state dominance approximation by taking into account the finite chain-length (chain-end) effects (GSDE). A good agreement between the two approaches is demonstrated within the natural region of validity of the asymptotically exact GSDE theory. It is shown that in most cases the interaction potentials involve the short-range depletion attraction which is replaced by the polymer-mediated repulsion at longer separations ranging from roughly 10 xi to 3R(g) (xi is the concentration correlation length and R-g is the polymer coil gyration radius). For a given polymer concentration and molecular weight the highest repulsion energy barrier, U-m, is predicted for xi/R-g similar to 0.2 and in the theta-solvent conditions. The fluctuation-induced (anti-Casimir) polymer-mediated repulsion forces are analyzed as well. It is shown that the overall polymer-mediated repulsion energy between naked spherical particles of radius R-c = 200 nm is typically not enough for their kinetic stabilization. There are, however, a few special cases where colloidal stability can be imparted by free polymers only. (C) 2013 AIP Publishing LLC.
Keyword:
LONG-RANGE INTERACTIONS
DEPLETION STABILIZATION
POLYETHYLENE-GLYCOL
STATISTICAL-THEORY
STABILITY
FLOCCULATION
POLYSTYRENE
ADSORPTION
DISPERSIONS
SURFACE
期刊
IF:
3.1
论文数:
7.2W
被引数:
23.2W
机构
引用论文
.png){kind=icon}
分享收藏分享收藏
查看更多内容