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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通过空间和时间分辨电子顺磁共振波谱同时监测二氧化硅和有机二氧化硅气凝胶中客体分子的宏观和微观扩散
DOI:
10.1021/acs.jpcc.5b05743
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发表时间:
2015
影响因子:
3.7
通讯作者:
M. Drescher
中科院分区:
文献类型:
--
作者:
M. Spitzbarth;M. Wessig;T. Lemke;A. Schachtschneider;S. Polarz;M. Drescher
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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影响因子:
3.7
作者:
Martin Wessig;M. Drescher;S. Polarz
通讯作者:
Martin Wessig;M. Drescher;S. Polarz
DOI:
--
发表时间:
1985
期刊:
影响因子:
--
作者:
F. Romero;J. L. Romero;J. Archilla
通讯作者:
J. Archilla
影响因子:
2.2
作者:
MALTEMPO, MM;EATON, SS;EATON, GR
通讯作者:
EATON, GR
影响因子:
19
作者:
A. Kuschel;S. Polarz
通讯作者:
S. Polarz
DOI:
--
发表时间:
1970
期刊:
影响因子:
--
作者:
D. Kivelson;M. Kivelson;I. Oppenheim
通讯作者:
I. Oppenheim