Lattice model of mobility at interfaces

Free surfaces, substrates, and bilayers

Nicholas B. Tito, Jane E.G. Lipson, Scott Thomas Milner

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A simple kinetic lattice model of free volume and mobility transport in fluids is applied to study the enhancement of mobility at a free surface in thin fluid films, as well as proximity effects in fluid bilayers consisting of materials with different local mobility. Consistent with experimental observations on fluid and polymeric thin films, our model predicts the presence of a mobile layer of material near the free surface of a kinetically arrested (glassy) film. The mobile layer extends deeper into the film, in front-like fashion, as the sample approaches the transition to complete fluidity. The extent of enhanced mobility is independent of film thickness at a given temperature, thus we find that thinner films have more suppressed sample-average glass transition temperatures compared to bulk material. This theme repeats itself in our simulations of fluid bilayers; slabs of material with suppressed or enhanced mobility respectively cause premature or delayed glassification of the whole system.

Original languageEnglish (US)
Pages (from-to)9403-9413
Number of pages11
JournalSoft Matter
Volume9
Issue number39
DOIs
StatePublished - Oct 21 2013

Fingerprint

Fluids
Substrates
fluids
fluid films
Thin films
Fluidity
Free volume
thin films
Polymer films
glass transition temperature
Film thickness
slabs
film thickness
Kinetics
augmentation
causes
kinetics
simulation
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Tito, Nicholas B. ; Lipson, Jane E.G. ; Milner, Scott Thomas. / Lattice model of mobility at interfaces : Free surfaces, substrates, and bilayers. In: Soft Matter. 2013 ; Vol. 9, No. 39. pp. 9403-9413.
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Lattice model of mobility at interfaces : Free surfaces, substrates, and bilayers. / Tito, Nicholas B.; Lipson, Jane E.G.; Milner, Scott Thomas.

In: Soft Matter, Vol. 9, No. 39, 21.10.2013, p. 9403-9413.

Research output: Contribution to journalArticle

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