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Nanoparticle‐Induced Phase Transitions in Diblock‐Copolymer Films
Author(s) -
Kim B. J.,
Chiu J. J.,
Yi G.R.,
Pine D. J.,
Kramer E. J.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200500502
Subject(s) - materials science , copolymer , volume fraction , nanoparticle , lamellar structure , phase (matter) , layer (electronics) , chemical engineering , solvent , substrate (aquarium) , spheres , nanotechnology , polymer chemistry , composite material , polymer , organic chemistry , oceanography , physics , astronomy , geology , chemistry , engineering
Films of a symmetric A–B diblock copolymer and A‐coated Au nanoparticles cast from a selective solvent for A develop a lamellar surface layer. The surface layers have a low volume fraction of nanoparticles in the A lamellae atop a substrate layer of B cylinders/spheres in an A matrix containing a larger volume fraction of nanoparticles (see Figure). This arrangement thus induces an order–order transition between block‐copolymer phases as their concentration is increased.