NEUTRON SCATTERING MEASUREMENTS OF NANOPARTICLE DIRECTED SELF-ASSEMBLY OF BLOCK-COPOLYMERS
Kevin G. Yager1, Brian C. Berry1, Kirt Page1, Derek Patton1, Ronald Jones1, Alamgir Karim1, Eric J. Amis2
1Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD
2Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD
Directed self-assembly is a promising route to controlling the nanostructure and surface properties of coatings. We present a general and robust strategy for controlling the self-assembly of thin films by tuning the film-substrate interaction, using an inherently defective nanoparticle layer. These tunable surfaces exhibit controllable roughness via spin-coating conditions (20 nm silica nanoparticle solutions), and tunable surface energy via selective oxidation. We demonstrate control of the orientation of lamellae in poly(deuterated-styrene-block-methyl methacrylate), with expression of the vertical lamellae orientation under certain conditions. We apply complementary neutron reflectivity and tomographic small angle neutron-scattering in order to elucidate the internal three-dimensional order and orientation of the nanostructures, an approach that can be generalized to many cases of directed self-assembly.
Name: Kevin G. Yager
Mentor Name: Alamgir Karim
Division: Polymers (854)
Address: Room B232 (Mailstop 8541) Polymers Building (224)
Sigma Xi membership: Not members.