Mixed equilibrium/nonequilibrium effects govern surface mobility in polymer glasses
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866914674008653824 |
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| author | Xu, Jianquan Ghanekarade, Asieh Li, Li Zhu, Huifeng Yuan, Hailin Yan, Jinsong Simmons, David S. Tsui, Ophelia K. C. Wang, Xinping |
| author_facet | Xu, Jianquan Ghanekarade, Asieh Li, Li Zhu, Huifeng Yuan, Hailin Yan, Jinsong Simmons, David S. Tsui, Ophelia K. C. Wang, Xinping |
| contents | The temperature at which supercooled liquids turn into solid-like glasses ($T_g$) can change at the free surface, affecting the properties of nanostructured glasses and their applications. However, inadequate experimental resolution to determine the $T_g$ gradient and a longstanding debate over the role of nonequilibrium effects have hindered fundamental understanding of this phenomenon. Using spatially resolved $T_g$ measurements and molecular dynamics simulations, we reveal a crossover from equilibrium behavior to a new regime of near-surface nonequilibrium glass physics on cooling. This crossover causes the form of the nonequilibrium $T_g$ gradient to change, highlighting the need to include these physics for rational understanding of the properties of realistic nanostructured glass-forming materials. They also potentially recast the interpretation of decades of experimental data on nanoconfined glasses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_06917 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Mixed equilibrium/nonequilibrium effects govern surface mobility in polymer glasses Xu, Jianquan Ghanekarade, Asieh Li, Li Zhu, Huifeng Yuan, Hailin Yan, Jinsong Simmons, David S. Tsui, Ophelia K. C. Wang, Xinping Soft Condensed Matter Materials Science The temperature at which supercooled liquids turn into solid-like glasses ($T_g$) can change at the free surface, affecting the properties of nanostructured glasses and their applications. However, inadequate experimental resolution to determine the $T_g$ gradient and a longstanding debate over the role of nonequilibrium effects have hindered fundamental understanding of this phenomenon. Using spatially resolved $T_g$ measurements and molecular dynamics simulations, we reveal a crossover from equilibrium behavior to a new regime of near-surface nonequilibrium glass physics on cooling. This crossover causes the form of the nonequilibrium $T_g$ gradient to change, highlighting the need to include these physics for rational understanding of the properties of realistic nanostructured glass-forming materials. They also potentially recast the interpretation of decades of experimental data on nanoconfined glasses. |
| title | Mixed equilibrium/nonequilibrium effects govern surface mobility in polymer glasses |
| topic | Soft Condensed Matter Materials Science |
| url | https://arxiv.org/abs/2402.06917 |