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- W3046392569 abstract "We show that shifts in dynamics of confined systems relative to that of the bulk material originate in the properties of bulk alone, and exhibit the same form of behavior as when different bulk isobars are compared. For bulk material, pressure-dependent structural relaxation times follow $ensuremath{tau}(T,V)ensuremath{propto}mathrm{exp}[f(T)ifmmodetimeselsetexttimesfi{}g(V)]$. When two states (isobars) of the material, ``1'' and ``2'', are compared at the same temperature this leads to a form ${ensuremath{tau}}_{2}ensuremath{propto}{ensuremath{tau}}_{1}^{c}$, where $c=g[{V}_{2}(T)]/g[{V}_{1}(T)]$. Using equation of state analysis and two models for $P$-dependent dynamics, we show that $c$ is approximately $T$ independent, and that it can be very simply expressed in terms of either the (free) volume above the close packed state (${V}_{mathrm{free}}$) or the activation energy for cooperative motion. The effect of changing state through a shift in pressure (${P}_{1}$ to ${P}_{2}$) is thus mechanistically traceable to cooperativity changing with density, through ${V}_{mathrm{free}}$. The connection with confined dynamics follows when 1 and 2 are taken as bulk and film at ambient $P$, differing in density only due to the film surface. The general form for $ensuremath{tau}(T,V)$ also illuminates why samples in different states (film vs bulk, high $P$ vs low) trend toward the same relaxation behavior at high $T$." @default.
- W3046392569 created "2020-08-07" @default.
- W3046392569 creator A5080749667 @default.
- W3046392569 creator A5085213152 @default.
- W3046392569 date "2020-07-30" @default.
- W3046392569 modified "2023-09-27" @default.
- W3046392569 title "To Understand Film Dynamics Look to the Bulk" @default.
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- W3046392569 doi "https://doi.org/10.1103/physrevlett.125.058002" @default.
- W3046392569 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32794834" @default.
- W3046392569 hasPublicationYear "2020" @default.
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