Abstract
We report static and dynamic light-scattering measurements of aqueous glucose solutions near their glass transition. Photon correlation spectroscopy reveals two relaxation processes present in the supercooled liquid: a nonexponential and nonhydrodynamic, α -relaxation occurring at short times and an exponential and hydrodynamic relaxation occurring at longer times. The slow relaxation is seen only in the polarized scattering geometry and is in many ways identical to the "ultraslow" mode recently observed by others in specially annealed molecular glass-forming liquids and attributed to the formation of long-range density correlations or "dynamic clusters." Static light scattering confirms the existence of excess scattering in our glucose solutions that is consistent with clusters in a size range between 30 and 60 nm. The size of the clusters varies with the water content and the clustering appears to be associated with the percolation of a hydrogen-bonded glucose network.
| Original language | English |
|---|---|
| Article number | 011505 |
| Journal | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics |
| Volume | 76 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 10 2007 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Condensed Matter Physics
- Statistical and Nonlinear Physics
- Mathematical Physics
Cite this
Ultraslow relaxation of hydrogen-bonded dynamic clusters in glass-forming aqueous glucose solutions : A light scattering study. / Sidebottom, David L.
In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 76, No. 1, 011505, 10.07.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ultraslow relaxation of hydrogen-bonded dynamic clusters in glass-forming aqueous glucose solutions
T2 - A light scattering study
AU - Sidebottom, David L.
PY - 2007/7/10
Y1 - 2007/7/10
N2 - We report static and dynamic light-scattering measurements of aqueous glucose solutions near their glass transition. Photon correlation spectroscopy reveals two relaxation processes present in the supercooled liquid: a nonexponential and nonhydrodynamic, α -relaxation occurring at short times and an exponential and hydrodynamic relaxation occurring at longer times. The slow relaxation is seen only in the polarized scattering geometry and is in many ways identical to the "ultraslow" mode recently observed by others in specially annealed molecular glass-forming liquids and attributed to the formation of long-range density correlations or "dynamic clusters." Static light scattering confirms the existence of excess scattering in our glucose solutions that is consistent with clusters in a size range between 30 and 60 nm. The size of the clusters varies with the water content and the clustering appears to be associated with the percolation of a hydrogen-bonded glucose network.
AB - We report static and dynamic light-scattering measurements of aqueous glucose solutions near their glass transition. Photon correlation spectroscopy reveals two relaxation processes present in the supercooled liquid: a nonexponential and nonhydrodynamic, α -relaxation occurring at short times and an exponential and hydrodynamic relaxation occurring at longer times. The slow relaxation is seen only in the polarized scattering geometry and is in many ways identical to the "ultraslow" mode recently observed by others in specially annealed molecular glass-forming liquids and attributed to the formation of long-range density correlations or "dynamic clusters." Static light scattering confirms the existence of excess scattering in our glucose solutions that is consistent with clusters in a size range between 30 and 60 nm. The size of the clusters varies with the water content and the clustering appears to be associated with the percolation of a hydrogen-bonded glucose network.
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U2 - 10.1103/PhysRevE.76.011505
DO - 10.1103/PhysRevE.76.011505
M3 - Article
VL - 76
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 1
M1 - 011505
ER -