Single-crystal diffraction from two-dimensional block copolymer arrays.
The structure of oriented 2D block copolymer single crystals is characterized by grazing-incidence small-angle x-ray diffraction, demonstrating long-range sixfold orientational order. From line shape analysis of the higher-order Bragg diffraction peaks, we determine that translational order decays algebraically with a decay exponent eta=0.2, consistent with the Kosterlitz-Thouless-Halperin-Nelson-Young theory for a 2D crystal with a shear modulus mu=2 x 10(-4) N/m.
Stein
G E
GE
Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.
Kramer
E J
EJ
Li
X
X
Wang
J
J