Web Release Date: August 7,
Hierarchical Nanostructure Control in Rod-Coil Block Copolymers with Magnetic Fields
University of California, Berkeley and Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
Received May 24, 2007
Revised July 17, 2007
Abstract:
Magnetic field alignment of rod-coil block copolymers is shown to proceed through coupling to the diamagnetic moment of individual rod blocks. Block copolymer self-assembly then leads to alignment of the interfaces perpendicular to the field lines and long range order on a 10 nm lengthscale. This is in contrast to previously demonstrated alignment techniques, which couple to the block copolymer interfaces rather than individual molecules. Furthermore, alignment occurs without direct physical contact to samples millimeters in size.
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