Confined viscous liquids

Interfacial versus finite size effects

F. He, L. M. Wang, Ranko Richert

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Confining a supercooled liquid to spaces of severalnanometer in diameter can lead to dramatic changes in the relaxationdynamics of the material. In many cases, the effect is reported as aconfinement induced shift of the glass transition temperature Tg. Both positive and negative values for ΔTg have been observed and the length scale of the confininggeometry is considered the main variable. We review the dynamics ofglass-forming liquids in both hard and soft confinement of <10 nm spaces, with focus on results from solvation dynamics experiments.It is shown that the interface is instrumental in determinig the dynamics, giving rise to reaxation time gradients across the cooperativity length scale of the liquid. Depending on the interfacial conditions, dynamics can become faster or slower for the same liquid, same size of confinement, and identical experimental technique used. No indications of true finite size effects are observed, and the pore or droplet size is relevant only indirectly through the relative number of molecules near the surface.

Original languageEnglish (US)
Pages (from-to)3-9
Number of pages7
JournalEuropean Physical Journal: Special Topics
Volume141
Issue number1
DOIs
StatePublished - Feb 2007

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Liquids
liquids
Solvation
confining
glass transition temperature
solvation
indication
porosity
gradients
Molecules
shift
molecules
Experiments
Glass transition temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Confined viscous liquids : Interfacial versus finite size effects. / He, F.; Wang, L. M.; Richert, Ranko.

In: European Physical Journal: Special Topics, Vol. 141, No. 1, 02.2007, p. 3-9.

Research output: Contribution to journalArticle

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