Structures of glasses created by multiple kinetic arrests
Abstract
X-ray scattering has been used to characterize glassy itraconazole (ITZ) prepared by cooling at different rates. Faster cooling produces ITZ glasses with lower (or zero) smectic order with more sinusoidal density modulation, larger molecular spacing, and shorter lateral correlation between the rod-like molecules. We find that each glass is characterized by not one, but two fictive temperatures Tf (the temperature at which a chosen order parameter is frozen in the equilibrium liquid). The higher Tf is associated with the regularity of smectic layers and lateral packing, while the lower Tf with the molecular spacings between and within smectic layers. This indicates that different structural features are frozen on different timescales. The two timescales for ITZ correspond to its two relaxation modes observed by dielectric spectroscopy: the slower δ mode (end-over-end rotation) is associated with the freezing of the regularity of molecular packing and the faster α mode (rotation about the long axis) with the freezing of the spacing between molecules. Finally, our finding suggests a way to selectively control the structural features of glasses.
- Authors:
-
[1];
[1];
[1];
[2];
[3];
[1]
- Univ. of Wisconsin, Madison, WI (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Arizona State Univ., Tempe, AZ (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1909345
- Grant/Contract Number:
- AC02-06CH11357; DMR-1904601; DMR-1720415
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 156; Journal Issue: 8; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; glass; structure
Citation Formats
Yu, Junguang, Chen, Zhenxuan, Teerakapibal, Rattavut, Benmore, Chris, Richert, Ranko, and Yu, Lian. Structures of glasses created by multiple kinetic arrests. United States: N. p., 2022.
Web. doi:10.1063/5.0080846.
Yu, Junguang, Chen, Zhenxuan, Teerakapibal, Rattavut, Benmore, Chris, Richert, Ranko, & Yu, Lian. Structures of glasses created by multiple kinetic arrests. United States. https://doi.org/10.1063/5.0080846
Yu, Junguang, Chen, Zhenxuan, Teerakapibal, Rattavut, Benmore, Chris, Richert, Ranko, and Yu, Lian. Tue .
"Structures of glasses created by multiple kinetic arrests". United States. https://doi.org/10.1063/5.0080846. https://www.osti.gov/servlets/purl/1909345.
@article{osti_1909345,
title = {Structures of glasses created by multiple kinetic arrests},
author = {Yu, Junguang and Chen, Zhenxuan and Teerakapibal, Rattavut and Benmore, Chris and Richert, Ranko and Yu, Lian},
abstractNote = {X-ray scattering has been used to characterize glassy itraconazole (ITZ) prepared by cooling at different rates. Faster cooling produces ITZ glasses with lower (or zero) smectic order with more sinusoidal density modulation, larger molecular spacing, and shorter lateral correlation between the rod-like molecules. We find that each glass is characterized by not one, but two fictive temperatures Tf (the temperature at which a chosen order parameter is frozen in the equilibrium liquid). The higher Tf is associated with the regularity of smectic layers and lateral packing, while the lower Tf with the molecular spacings between and within smectic layers. This indicates that different structural features are frozen on different timescales. The two timescales for ITZ correspond to its two relaxation modes observed by dielectric spectroscopy: the slower δ mode (end-over-end rotation) is associated with the freezing of the regularity of molecular packing and the faster α mode (rotation about the long axis) with the freezing of the spacing between molecules. Finally, our finding suggests a way to selectively control the structural features of glasses.},
doi = {10.1063/5.0080846},
journal = {Journal of Chemical Physics},
number = 8,
volume = 156,
place = {United States},
year = {Tue Feb 22 00:00:00 EST 2022},
month = {Tue Feb 22 00:00:00 EST 2022}
}
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