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DOE OSTI · 2440509

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

Mueller, Andreas J.·Lindsay, Aaron P.·Lewis, Ronald M.·Zhang, Qingteng·Narayanan, Suresh·Lodge, Timothy P.·Mahanthappa, Mahesh K.·Bates, Frank S.
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Abstract

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 (DDQC) and a periodic Frank-Kasper σ phase approximant. The measured structural relaxation times are Bragg scattering wavevector-independent and are five times faster in the DDQC than the σ phase, with minimal temperature dependence. Further, 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.

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Mueller, Andreas J., Lindsay, Aaron P., Lewis, Ronald M., Zhang, Qingteng, Narayanan, Suresh, Lodge, Timothy P., Mahanthappa, Mahesh K., Bates, Frank S.. 2024-04-10. Particle Dynamics in a Diblock-Copolymer-Based Dodecagonal Quasicrystal and Its Periodic Approximant by X-Ray Photon Correlation Spectroscopy. https://doi.org/10.1103/physrevlett.132.158101

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