Particle Dynamics in a Diblock-Copolymer-Based Dodecagonal Quasicrystal and Its Periodic Approximant by X-Ray Photon Correlation Spectroscopy

Temperature-dependent x-ray photon correlation spectroscopy (XPCS) measurements are reported for a binary diblock-copolymer blend that self-assembles into an aperiodic dodecagonal quasicrystal and a periodic Frank-Kasper σ phase approximant. The measured structural relaxation times are Bragg scatter...

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Bibliographic Details
Published in:Physical review letters 2024-04, Vol.132 (15), p.158101-158101, Article 158101
Main Authors: Mueller, Andreas J, Lindsay, Aaron P, Lewis, Ronald M, Zhang, Qingteng, Narayanan, Suresh, Lodge, Timothy P, Mahanthappa, Mahesh K, Bates, Frank S
Format: Article
Language:English
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Summary:Temperature-dependent x-ray photon correlation spectroscopy (XPCS) measurements are reported for a binary diblock-copolymer blend that self-assembles into an aperiodic dodecagonal quasicrystal and a periodic Frank-Kasper σ phase approximant. The measured structural relaxation times are Bragg scattering wavevector independent and are 5 times faster in the dodecagonal quasicrystal than the σ phase, with minimal temperature dependence. The underlying dynamical relaxations are ascribed to differences in particle motion at the grain boundaries within each of these tetrahedrally close-packed assemblies. These results identify unprecedented particle dynamics measurements of tetrahedrally coordinated micellar block polymers, thus expanding the application of XPCS to ordered soft materials.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.132.158101