News Flash  

Sep. 2016: Second Workshop on Hierarchical Materials in Erlangen: RV with invited lecture on transport properties of hierarchical porous solids.

Sep. 2015: IUPAC has established the task group "Diffusion in nanoporous solids" involving us as the active members.

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Sep. 2015Our work on diffusion in hollow core-shell nanoparticles just appeared in Langmuir.

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Seminars  

R. Valiullin: Mesoporous materials -- Perspectives revealed by fluids confined in their pore spaces
Mo, 27.06.2016, 17:15–18:00
Universität Hamburg, Fachbereich Chemie, Martin-Luther-King-Platz 6, Hörsaal C

October 21-23, 2015
R. Valiullin: NMR Cryoporometry: From fundamentals to application
Workshop: Methods of Porosimetry and Applications (HZDR Dresden-Rossendorf)

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Sep. 2015Our work on diffusion in hollow core-shell nanoparticles just appeared in Langmuir.

The diffusion behavior of small molecules in hollow core−shell nanocapsules was studied using pulsed field gradient NMR. By purposefully selecting the liquid saturating the hollow core and the porous shell and the solvent between the nanocapsules, two different situations corresponding to the excluded and admitted molecular exchange between the intra- and intercapsule liquids at the external boundary of the nanoparticles were covered. In the former case, corresponding to the reflective boundary condition for the molecules approaching the nanocapsule boundary, restricted diffusion in the complex pore space formed by the hollow core and the mesoporous shell was observed. The time-dependent diffusivities measured in the experiment were inter-related with the geometry of the intraparticle pore space. The thus assessed structural information was found to be in a good agreement with that provided by electron microscopy. In the case of the molecular exchange occurring between the two pools of molecules in the nanocapsules and between them, the diffusive dynamics of only the molecules remaining in the nanocapsules during the entire observation times was studied.

Diffusion and Molecular Exchange in Hollow Core–Shell Silica Nanoparticles
Pochert, A., D. Schneider, J. Haase, M. Linden, and R. Valiullin, Langmuir, (2015)

   
© Rustem Valiullin, 2006-2013