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Issue 43, 2018
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Molecular layers in thin supported films exhibit the same scaling as the bulk between slow relaxation and vibrational dynamics

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Abstract

We perform molecular-dynamics simulations of a supported molecular thin film. By varying thickness and temperature, we observe anisotropic mobility as well as strong gradients of both the vibrational motion and the structural relaxation through film layers with monomer-size thickness. We show that the gradients of the fast and the slow dynamics across the layers (except the adherent layer to the substrate) comply, without any adjustment, with the same scaling between the structural relaxation time and the Debye–Waller factor originally observed in the bulk [Larini et al., Nat. Phys., 2008, 4, 42]. The scaling is not observed if the average dynamics of the film is inspected. Our results suggest that the solidification process of each layer may be tracked by knowing solely the vibrational properties of the layer and the bulk.

Graphical abstract: Molecular layers in thin supported films exhibit the same scaling as the bulk between slow relaxation and vibrational dynamics

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Publication details

The article was received on 15 Sep 2018, accepted on 13 Oct 2018 and first published on 15 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01891J
Citation: Soft Matter, 2018,14, 8814-8820
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    Molecular layers in thin supported films exhibit the same scaling as the bulk between slow relaxation and vibrational dynamics

    M. Becchi, A. Giuntoli and D. Leporini, Soft Matter, 2018, 14, 8814
    DOI: 10.1039/C8SM01891J

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