Related Experiment Video
Updated: Aug 7, 2026

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
Published on: September 2, 2016
Diffusion properties of dye molecules in nanoporous TiO2 networks
M Dürr1, A Schmid, M Obermaier
1Materials Science Laboratory, Sony Deutschland GmbH, 70327 Stuttgart, Germany. duerr@sony.de
Abstract:
The adsorption of ruthenium-dye molecules out of ethanol solution onto TiO2 particles of nanoporous TiO2 films was used to study the molecules' diffusion through these layers by means of optical absorption spectrometry. Dependent on pore size, porosity, and particle size, effective diffusion constants as low as D(eff) = 4 x 10(-9) cm2/s were deduced from the uptake curves by applying a simple model for combined diffusion and adsorption. These diffusion constants for diffusion through the nanoporous network are up to 3 orders of magnitude lower than in bulk ethanol and are discussed with respect to the properties of the nanoporous material.
More Related Videos
Related Concept Videos
Protein Diffusion in the Membrane
Diffusion
Diffusion
Passive Diffusion: Overview and Kinetics
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting their diffusion into...

