Summary
A refractometric method designed to study the diffusive behaviour of low molecular compounds in solid macromolecular substances in the form of thin layers is described. The layer thickness is determined interferometrically in the apparatus. The system gelatin-water is studied at three different thicknesses, 31 μ, 40 μ and 82 μ, at 25°C. The diffusion process is found to be characterized by a diffusion coefficient which is dependent on concentration only, i. e. independent of time. Also, the concentration at the surface of the layer is found to change instantly from the initial concentration to the equilibrium concentration at the beginning of a diffusion experiment.
Zusammenfassung
Es wird eine refraktometrische Methode zur Untersuchung der Diffusion von niedermolekularen Verbindungen in festen makromolekularen Substanzen in Form dünner Schichten beschrieben. Die Schichtdicke wird im Gerät interferometrisch bestimmt. Das System Gelatine-Wasser ist bei drei verschiedenen Dicken (31 μ, 40 μ und 82 μ) bei 25°C gemessen. Es zeigt sich, daß der Diffusionskoeffizient allein von der Konzentration, also z. B. u. a. unabhängig von der Zeit ist. Auch wechselt die Konzentration an der Oberflächenschicht augenblicklich von der anfänglichen zur Gleichgewichtskonzentration bei Beginn eines Diffusions-experimentes.
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Staaf, O. Diffusion of water in gelatin studied by a new refractometric method. Kolloid-Z.u.Z.Polymere 219, 30–39 (1967). https://doi.org/10.1007/BF02086092
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DOI: https://doi.org/10.1007/BF02086092