Hierarchical nanostructure control in rod-coil block copolymers with magnetic fields.
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.
University of California, Berkeley and Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA.
Yuefei
Y
Tao
Hagar
H
Zohar
Bradley D
BD
Olsen
Rachel A
RA
Segalman
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D004574:Electromagnetic Fields; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties
D046911:Macromolecular Substances; D011108:Polymers