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The Use of Second‐Harmonic Generation to Study Diffusion through Films under a Liquid Phase |
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| Authors: | Monique A. van der Veen Marjan De Roeck Ivo F. J. Vankelecom Prof. Dr. Dirk E. De Vos Prof. Dr. Thierry Verbiest Prof. Dr. |
| Affiliation: | 1. Center for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark 23, Box 2461, 3001 Leuven (Belgium), Fax: (+32)?16?321998;2. Molecular Electronics and Photonics, Department of Chemistry, K.U.Leuven, Celestijnenlaan 200D, box 2425, 3001 Leuven (Belgium) |
| Abstract: | 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. |
| Keywords: | diffusion interfaces nonlinear optics second‐harmonic generation thin films |