Abstract
Understanding the molecular behavior of water in spatially restricted environments is key to better understanding its role in many biological, chemical and geological processes. Here we examine the translational diffusion of water confined to a variety of substrates, from flat surfaces to nanoporous media, in the context of a recently proposed universal scaling law (Chiavazzo 2014) [1]. Using over a dozen previous neutron scattering results, we test the validity of this law, evaluating separately the influence of the hydration amount, and the effects of the size and morphology of the confining medium. Additionally, we investigate the effects of changing instrument resolutions and fitting models on the applicability of this law. Finally, we perform quasi-elastic neutron scattering measurements on water confined inside nanoporous silica to further evaluate this predictive law, in the temperature range 250 ≤ T ≤ 290 K.
| Original language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Chemical Physics |
| Volume | 465-466 |
| DOIs | |
| State | Published - Feb 3 2016 |
Funding
We are thankful to the staff at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL) for the support during the BASIS measurements. We acknowledge the use of the Mantid software package [42] for the data reduction and the DAVE software [43] for the data analysis. A.C. is grateful to the National GEM Consortium for its fellowship program. This research was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) center, an Energy Frontier Research Center funded by the U.S. Department of Energy , Office of Basic Energy Sciences. Work at ORNL’s SNS is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.
Keywords
- Neutron scattering
- Porous media
- Water diffusion