The use of second-harmonic generation to study diffusion through films under a liquid phase.
Knowledge of the diffusion of chemicals through buried films is important for a wide variety of systems--from sensing to drug delivery. Herein, we show that second-harmonic generation (SHG) can be used to follow the diffusion through a thin film buried under a liquid in situ. More specifically, the diffusion of 4-(4-diethylaminostyryl)-1-methylpyridinium iodide through zeolite precursor films of different thickness is followed. The diffusion coefficients are calculated according to Fick's law.
van der Veen
Monique A
MA
Center for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark 23, Box 2461, 3001 Leuven, Belgium. monique.vanderveen@biw.kuleuven.be
De Roeck
Marjan
M
Vankelecom
Ivo F J
IF
De Vos
Dirk E
DE
Verbiest
Thierry
T