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 language | English (US) |
|---|---|
| Pages (from-to) | 3-9 |
| Number of pages | 7 |
| Journal | European Physical Journal: Special Topics |
| Volume | 141 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 2007 |
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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 journal › Article
}
TY - JOUR
T1 - Confined viscous liquids
T2 - Interfacial versus finite size effects
AU - He, F.
AU - Wang, L. M.
AU - Richert, Ranko
PY - 2007/2
Y1 - 2007/2
N2 - 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.
AB - 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.
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U2 - 10.1140/epjst/e2007-00008-0
DO - 10.1140/epjst/e2007-00008-0
M3 - Article
VL - 141
SP - 3
EP - 9
JO - European Physical Journal: Special Topics
JF - European Physical Journal: Special Topics
SN - 1951-6355
IS - 1
ER -