Diffusion is one of the omnipresent phenomena in nature. For fluids confined to mesoporous solids, diffusion, in addition to the complex structure of these materials, is found to be further diversified by their very rich phase behavior. By applying NMR as a non-perturbing experimental technique, we explore the correlations between the phase state and internal dynamics in mesoporous solids in the proximity of the coexistence lines for the entire PT-phase diagram. In turn, we exploit diffusion measurements as a sensitive tool to probe  phase equilibria and material characterization.  In confined systems, different phases may coexist with each other, giving rise to alternations of molecular trajectories between different phases and, in some cases, to severe modifications of the transport mechanisms. In addition, the existence of the interfaces between the domains of different phases, at which quite different boundary conditions (reflecting, adsorbing or partially adsorbing) may apply, makes understanding of the diffusion process a challenging problem. Our current activities in this direction concern the diffusion behavior in the newly emerging class of hierarchical porous solids.

  1. P Zeigermann and R Valiullin. Transport Properties of Gas-Expanded Liquids in Bulk and under Confinement. J. Supercrit. Fluid. 75:43-47, 2013. BibTeX

    @article{Z2013,
    	author = "Zeigermann, P. and Valiullin, R.",
    	title = "Transport Properties of Gas-Expanded Liquids in Bulk and under Confinement",
    	journal = "J. Supercrit. Fluid.",
    	volume = 75,
    	pages = "43-47",
    	year = 2013
    }
    
  2. R Valiullin. Diffusion in Nanoporous Host Systems. Annual Reports on NMR Spectroscopy 79:23-72, 2013. BibTeX

    @article{V2013,
    	author = "Valiullin, R.",
    	title = "Diffusion in Nanoporous Host Systems",
    	journal = "Annual Reports on NMR Spectroscopy",
    	volume = 79,
    	pages = "23-72",
    	year = 2013
    }
    
  3. J Kärger and R Valiullin. Mass Transfer in Mesoporous Materials: The Benefit of Microscopic Diffusion Measurement. Chem. Soc. Rev. 42:4172 - 4197, 2013. BibTeX

    @article{K2013,
    	author = "Kärger, J. and Valiullin, R.",
    	title = "Mass Transfer in Mesoporous Materials: The Benefit of Microscopic Diffusion Measurement",
    	journal = "Chem. Soc. Rev.",
    	volume = 42,
    	pages = "4172 - 4197",
    	year = 2013
    }
    
  4. R Valiullin. Phase State and Dynamics of Fluids in Mesoporous Solids. AIP Conf. Proc. 1330:39-42, 2011. BibTeX

    @article{2011,
    	author = "Valiullin, R.",
    	title = "Phase State and Dynamics of Fluids in Mesoporous Solids",
    	journal = "AIP Conf. Proc.",
    	volume = 1330,
    	pages = "39-42",
    	year = 2011
    }
    
  5. R Valiullin, J Kärger and R Gläser. Correlating phase behaviour and diffusion in mesopores: perspectives revealed by pulsed field gradient NMR. Phys. Chem. Chem. Phys. 11:2833-2853, 2009. BibTeX

    @article{2009,
    	author = "Valiullin, R. and Kärger, J. and Gläser, R.",
    	title = "Correlating phase behaviour and diffusion in mesopores: perspectives revealed by pulsed field gradient NMR",
    	journal = "Phys. Chem. Chem. Phys.",
    	volume = 11,
    	pages = "2833-2853",
    	year = 2009
    }
    
  6. M Dvoyashkin, R Valiullin, J Kärger, W -D Einicke and R Gläser. Direct Assessment of Transport Properties of Supercritical Fluids Confined to Nanopores. J. Am. Chem. Soc. 129:10344-10345, 2007. BibTeX

    @article{2007,
    	author = "Dvoyashkin, M. and Valiullin, R. and Kärger, J. and Einicke, W.-D. and Gläser, R.",
    	title = "Direct Assessment of Transport Properties of Supercritical Fluids Confined to Nanopores",
    	journal = "J. Am. Chem. Soc.",
    	volume = 129,
    	pages = "10344-10345",
    	year = 2007
    }
    

 
 
 
 
   
© Rustem Valiullin, 2006-2013