Particle Dynamics in a Diblock-Copolymer-Based Dodecagonal Quasicrystal and Its Periodic Approximant by X-Ray Photon Correlation Spectroscopy.
| Autor: | Mueller AJ; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA., Lindsay AP; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA., Lewis RM; Infineum USA, Linden, New Jersey 07036, USA., Zhang Q; Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60349, USA., Narayanan S; Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60349, USA., Lodge TP; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.; Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA., Mahanthappa MK; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA., Bates FS; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2024 Apr 12; Vol. 132 (15), pp. 158101. |
| DOI: | 10.1103/PhysRevLett.132.158101 |
| Abstrakt: | 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. |
| Databáze: | MEDLINE |
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