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Simultaneous Monitoring of Macroscopic and Microscopic Diffusion of Guest Molecules in Silica and Organosilica Aerogels by Spatially and Time-Resolved Electron Paramagnetic Resonance Spectroscopy

Simultaneous Monitoring of Macroscopic and Microscopic Diffusion of Guest Molecules in Silica and Organosilica Aerogels by Spatially and Time-Resolved Electron Paramagnetic Resonance Spectroscopy

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SPITZBARTH, Martin, Martin WESSIG, Tobias LEMKE, Andreas SCHACHTSCHNEIDER, Sebastian POLARZ, Malte DRESCHER, 2015. Simultaneous Monitoring of Macroscopic and Microscopic Diffusion of Guest Molecules in Silica and Organosilica Aerogels by Spatially and Time-Resolved Electron Paramagnetic Resonance Spectroscopy. In: The Journal of Physical Chemistry C. 119(30), pp. 17474-17479. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/acs.jpcc.5b05743

@article{Spitzbarth2015Simul-32653, title={Simultaneous Monitoring of Macroscopic and Microscopic Diffusion of Guest Molecules in Silica and Organosilica Aerogels by Spatially and Time-Resolved Electron Paramagnetic Resonance Spectroscopy}, year={2015}, doi={10.1021/acs.jpcc.5b05743}, number={30}, volume={119}, issn={1932-7447}, journal={The Journal of Physical Chemistry C}, pages={17474--17479}, author={Spitzbarth, Martin and Wessig, Martin and Lemke, Tobias and Schachtschneider, Andreas and Polarz, Sebastian and Drescher, Malte} }

Schachtschneider, Andreas We used spatially and time-resolved electron paramagnetic resonance (EPR) spectroscopy to study diffusion of guest molecules within solvent filled aerogel monoliths. We experimentally obtained the time-dependent spin density of EPR active guest molecules ρ<sub>1d</sub>(y,t), numerically solved the diffusion equation to simulate ρ<sub>1d</sub>(y,t), and determined the macroscopic translational diffusion coefficients for different aerogels and guest molecules. Simultaneously, we determined the microscopic diffusion coefficient by spectral simulation. We show that diffusion in the aerogels under study is dominated by the tortuosity of the pore system but not by surface effects. Schachtschneider, Andreas eng Simultaneous Monitoring of Macroscopic and Microscopic Diffusion of Guest Molecules in Silica and Organosilica Aerogels by Spatially and Time-Resolved Electron Paramagnetic Resonance Spectroscopy 2015 Drescher, Malte Lemke, Tobias Wessig, Martin 2016-01-20T13:56:23Z Polarz, Sebastian Spitzbarth, Martin Polarz, Sebastian Spitzbarth, Martin Wessig, Martin Lemke, Tobias 2016-01-20T13:56:23Z Drescher, Malte

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