Diblock Copolymer Ordering Induced by Patterned Surfaces Above the Order-Disorder Transition

Details Diblock Copolymer Ordering Induced by Patterned Surfaces Above the Order-Disorder Transition Diblock Copolymer Ordering Induced by Patterned Surfaces Above the Order-Disorder Transition

2000-07-04

arxiv.org/abs/cond-mat/0007055v2

Macromolecules 34, 2719 (2001).

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 14 figures, to be published in Macromolecules

Scientific paper

10.1021/ma001222k

We investigate the morphology of diblock copolymers in the vicinity of flat, chemically patterned surfaces. Using a Ginzburg-Landau free energy, spatial variations of the order parameter are given in terms of a general two-dimensional surface pattern above the order-disorder transition. The propagation of several surface patterns into the bulk is investigated. The oscillation period and decay length of the surface $q$-modes are calculated in terms of system parameters. We observe lateral order parallel to the surface as a result of order perpendicular to the surface. Surfaces which has a finite size chemical pattern (e.g., a stripe of finite width) induces lamellar ordering extending into the bulk. Close to the surface pattern the lamellae are strongly perturbed adjusting to the pattern.

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