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 a...

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Published in:Physical review letters 2007-02, Vol.98 (8), p.086101-086101, Article 086101
Main Authors: Stein, G E, Kramer, E J, Li, X, Wang, J
Format: Article
Language:English
Subjects:
BRAGG REFLECTION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPOLYMERS
MONOCRYSTALS
TWO-DIMENSIONAL CALCULATIONS
X-RAY DIFFRACTION
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cited_by cdi_FETCH-LOGICAL-c335t-d236e0412d736968ce7dab6ce84a9c05e1a63713628b0d1ce25435e9c4098ac73
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description 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.
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subjects BRAGG REFLECTION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPOLYMERS
MONOCRYSTALS
TWO-DIMENSIONAL CALCULATIONS
X-RAY DIFFRACTION
title Single-crystal diffraction from two-dimensional block copolymer arrays
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