Influence of measurement conditions on electron diffusion in nanoporous TiO2 films: effects of bias light and dye adsorption

Article Abstract:

The pulsed laser-induced current transients from the same nanoporous TiO2 electrodes both in the presence and in the absence of bias light are measured. Regardless of the methods, the derived electron diffusion coefficients (D) values from the transients are found in the same order and dependency on electron density. This suggests that both methods can be used to compare electron transport properties among different nanoporous films.

Titanium dioxide, Electrons

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Oxygen diffusion in bilayer polymer films

Article Abstract:

Experiments are performed to quantify oxygen diffusion on polymer samples in which a film of poly-(ethylene-co-norbornene) was cast onto a film of polystyrene which, in turn was cast onto an oxygen-impermeable substrate. The results indicate that this spectroscopic technique can be indeed be used to obtain an accurate oxygen diffusion coefficient for the outer sample layer in a bilayer film.

Oxygen, Industrial Gas Manufacturing, Industrial gases, Polymers, Chemistry, Physical and theoretical, Physical chemistry, Chemical properties

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Tracer-desorption (super 1)H NMR measurement of diffusion coefficients in polyphosphazene ion-exchange membranes

Article Abstract:

The mutual diffusion coefficient of methanol in a series of polyphosphazene-based cation exchange membrane is measured using tracer-desorption (super 1)H nuclear magnetic resonance (NMR). The (super 1)H NMR technique helps in measuring the growth of a solute NMR signal in the bulk solution as it diffuses out of a thin film membrane.

Nuclear magnetic resonance, Ion exchange, Magnetic properties, Phosphazo compounds, Polyphosphazenes

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