Evidence of a Transition Layer between the Free Surface and the Bulk

The Journal of Physical Chemistry Letters
Wojciech OgiegloNieck E Benes

Abstract

The free surface, a very thin layer at the interface between polymer and air, is considered the main source of the perturbations in the properties of ultrathin polymer films, i.e., nanoconfinement effects. The structural relaxation of such a layer is decoupled from the molecular dynamics of the bulk. The free surface is, in fact, able to stay liquid even below the temperature where the polymer resides in the glassy state. Importantly, this surface layer is expected to have a very sharp interface with the underlying bulk. Here, by analyzing the penetration of n-hexane into polystyrene films, we report on the existence of a transition region, not observed by previous investigations, extending for 12 nm below the free surface. The presence of such a layer permits reconciling the behavior of interfacial layers with current models and has profound implications on the performance of ultrathin membranes. We show that the expected increase in the flux of the permeating species is actually overruled by nanoconfinement.

References

Sep 23, 2003·Nature Materials·Christopher J Ellison, John M Torkelson
Jul 16, 2005·Science·Rodney D PriestleyJohn M Torkelson
Feb 2, 2008·Science·Z Fakhraai, J A Forrest
May 18, 2011·Journal of the American Chemical Society·Keewook PaengM D Ediger
Nov 3, 2011·Analytical Chemistry·Danielle W KimmelDavid E Cliffel
Dec 21, 2011·Physical Review Letters·Tadanori KogaS K Sinha
Mar 29, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D Cangialosi
Jan 31, 2017·Reports on Progress in Physics·Simone NapolitanoNicholas B Tito
Jun 3, 2017·The Journal of Chemical Physics·Marie-Luise BraatzSimone Napolitano
Jun 3, 2017·The Journal of Chemical Physics·Virginie M BoucherJuan Colmenero
Jun 3, 2017·The Journal of Chemical Physics·Roman R Baglay, Connie B Roth
Dec 30, 2017·Physical Review Letters·Emmanouil GlynosPeter F Green

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