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Combinatorial Mapping of Surface Energy Effects on Diblock Copolymer Thin Film Ordering
Author(s) -
Smith Archie P.,
Sehgal Amit,
Douglas Jack F.,
Karim Alamgir,
Amis Eric J.
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200390001
Subject(s) - copolymer , lamellar structure , materials science , thin film , surface energy , optics , morphology (biology) , surface (topology) , composite material , geometry , physics , nanotechnology , geology , polymer , mathematics , paleontology
Combinatorial gradient techniques are used to map the morphology dependence of thin symmetric diblock copolymer films on film thickness and substrate surface energy. An inversion from symmetric to anti‐symmetric lamellar morphology occurs with a progressive change in surface energy. An intermediate neutral region is found between these limiting types of ordering. The width ω of this transitional energy range scales as a power of copolymer mass M , ω ∝ M 1.9 .Optical photograph of a combinatorial map of the thin‐film block‐copolymer morphology on a film thickness and surface energy gradient. Island and holes on the surface scatter light causing the film to appear cloudy (lighter in color) in the areas where they exist. The darker areas do not have surface features and do not scatter light.