Structural characterization of porous solids by simultaneously monitoring the low-temperature phase equilibria and diffusion of intrapore fluids using nuclear magnetic resonance
| Autor: | Muslim Dvoyashkin, Rustem Valiullin, Daria Kondrashova |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Physics
Silicon Diffusion General Physics and Astronomy chemistry.chemical_element Porous glass Characterization (materials science) Nuclear magnetic resonance chemistry Phase (matter) porous solids low-temperature phase equilibria intrapore fluids nuclear magnetic resonance ddc:530 Nuclear magnetic resonance in porous media Porous medium Mesoporous material |
| Zdroj: | New Journal of Physics. 13:015008 |
| ISSN: | 1367-2630 |
| Popis: | Nuclear magnetic resonance (NMR) provides a variety of tools for the structural characterization of porous solids. In this paper, we discuss a relatively novel approach called NMR cryodiffusometry, which is based on a simultaneous assessment of both the phase state of intraporous liquids at low temperatures, using NMR cryoporometry, and their transport properties, using NMR diffusometry. Choosing two model porous materials with ordered and disordered pore structures as the host systems, we discuss the methodological and fundamental aspects of the method. Thus, with the use of an intentionally micro-structured mesoporous silicon, we demonstrate how its structural features give rise to specific patterns in the effective molecular diffusivities measured upon progressive melting of a frozen liquid in the mesopores. We then present the results of a detailed study of the transport properties of the same liquid during both melting and freezing processes in Vycor porous glass, a material with a random pore structure. 1 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|