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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

Mueller, Andreas J; Lindsay, Aaron P; Lewis, Ronald M; Zhang, Qingteng; Narayanan, Suresh; Lodge, Timothy P; Mahanthappa, Mahesh K; Bates, Frank S (April 2024, Physical Review Letters)

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. 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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Tuning Diblock Copolymer Particle Packing Symmetry with Variable Molecular Weight Core-Homopolymers

https://doi.org/10.1021/acs.macromol.2c01267

Mueller, Andreas J.; Lindsay, Aaron P.; Jayaraman, Ashish; Weigand, Steven; Lodge, Timothy P.; Mahanthappa, Mahesh K.; Bates, Frank S. (September 2022, Macromolecules)

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Quasicrystals and Their Approximants in a Crystalline–Amorphous Diblock Copolymer

https://doi.org/10.1021/acs.macromol.0c02871

Mueller, Andreas J.; Lindsay, Aaron P.; Jayaraman, Ashish; Lodge, Timothy P.; Mahanthappa, Mahesh K.; Bates, Frank S. (March 2021, Macromolecules)
null (Ed.)
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Reevaluation of Poly(ethylene- alt -propylene)- block -Polydimethylsiloxane Phase Behavior Uncovers Topological Close-Packing and Epitaxial Quasicrystal Growth

https://doi.org/10.1021/acsnano.1c02420

Lindsay, Aaron P.; Jayaraman, Ashish; Peterson, Austin J.; Mueller, Andreas J.; Weigand, Steven; Almdal, Kristoffer; Mahanthappa, Mahesh K.; Lodge, Timothy P.; Bates, Frank S. (May 2021, ACS Nano)
null (Ed.)
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Emergence of a C15 Laves Phase in Diblock Polymer/Homopolymer Blends

https://doi.org/10.1021/acsmacrolett.0c00124

Mueller, Andreas J.; Lindsay, Aaron P.; Jayaraman, Ashish; Lodge, Timothy P.; Mahanthappa, Mahesh K.; Bates, Frank S. (April 2020, ACS Macro Letters)

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