Journal
SCIENCE ADVANCES
Volume 8, Issue 11, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abl9809
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Funding
- VILLUM Foundation's Matter grant [16515]
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The noncrystalline glassy state of matter is important in materials science and offers unique properties. However, it undergoes physical aging due to being out of equilibrium. The existence of a material time is validated and physical aging can be predicted using fluctuation-dissipation theorem and computer simulations.
The noncrystalline glassy state of matter plays a role in virtually all fields of materials science and offers complementary properties to those of the crystalline counterpart. The caveat of the glassy state is that it is out of equilibrium and therefore exhibits physical aging, i.e., material properties change over time. For half a century, the physical aging of glasses has been known to be described well by the material-time concept, although the existence of a material time has never been directly validated. We do this here by successfully predicting the aging of the molecular glass 4-vinyl-1,3-dioxolan-2-one from its linear relaxation behavior. This establishes the defining property of the material time. Via the fluctuation-dissipation theorem, our results imply that physical aging can be predicted from thermal-equilibrium fluctuation data, which is confirmed by computer simulations of a binary liquid mixture.
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