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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The Journal of Physical Chemistry C. 2015, 119(30), pp. 17474-17479. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/acs.jpcc.5b05743
Zusammenfassung

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 ρ1d(y,t), numerically solved the diffusion equation to simulate ρ1d(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.

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ISO 690SPITZBARTH, 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. 2015, 119(30), pp. 17474-17479. ISSN 1932-7447. eISSN 1932-7455. Available under: doi: 10.1021/acs.jpcc.5b05743
BibTex
@article{Spitzbarth2015Simul-32653,
  year={2015},
  doi={10.1021/acs.jpcc.5b05743},
  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},
  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}
}
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