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arXiv:1109.0833v1[cond-mat.soft]5Sep2011 Block Copolymer Films with Free Interfaces: Ordering by Nano-Patterned Substrates
 

Summary: arXiv:1109.0833v1[cond-mat.soft]5Sep2011
Block Copolymer Films with Free Interfaces: Ordering by Nano-Patterned Substrates
Xingkun Man, David Andelman
Raymond and Beverly Sackler School of Physics and Astronomy,
Tel Aviv University, Ramat Aviv 69978, Tel Aviv, Israel
Henri Orland
Institut de Physique Th´eorique, CE-Saclay, CEA, F-91191 Gif-sur-Yvette Cedex, France
We study block copolymers (BCP) on patterned substrates, where the top polymer film surface
is not constrained but is a free interface that adapts its shape self-consistently. In particular, we
investigate the combined effect of the free interface undulations with the wetting of the BCP film
as induced by nano-patterned substrates. For a finite volume of BCP material, we find equilibrium
droplets composed of coexisting perpendicular and parallel lamellar domains. The self-assembly
of BCP on topographic patterned substrates was also investigated and it was found that the free
interface induces mixed morphologies of parallel and perpendicular domains coupled with a non-flat
free interface. In both cases, the free interface relaxes the strong constraints that would other-
wise be imposed by a fixed top boundary (which is commonly used in simulations), and affects
strongly the BCP ordering. Our study has some interesting consequences for experimental setups
of graphoepitaxy and nanoimprint lithography.
Thin films of block copolymer (BCP) have attracted
abiding interest over the years due to their numerous in-

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics