Surface adsorption of model dendrimers

被引:78
作者
Mansfield, ML
机构
[1] Michigan Molecular Institute, Midland, MI 48640
关键词
dendrimers; adsorption; Monte Carlo calculations;
D O I
10.1016/0032-3861(96)00216-9
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Lattice model dendrimers interacting with an adsorbing planar surface are studied by computer simulation, where G is the number of generations of the dendrimer and A is the interaction strength. With increasing A, dendrimers are observed to spread out and flatten down on the surface, as expected. In certain regions of G-A space, two competing configurational states, S-2 and S-3, are observed. In S-3 all three dendrons are adsorbed on the plane. In S-2 two dendrons are adsorbed, while the third sits up and away from the surface. G-A space divides into five separate regions: a desorption region where A is too weak to maintain adsorption, a weak adsorption region in which the dendrimer tends to maintain contact but with only weak perturbation of its shape, a region in which S-2 and S-3 compete because they have comparable free energies and are separated by a modest free energy barrier, a region in which S-3 dominates because it has lower free energy, and finally a region in which S-2 and S-3 both have high stabilities because they are separated by a large free energy barrier. Copyright (C) 1996 Elsevier Science Ltd.
引用
收藏
页码:3835 / 3841
页数:7
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