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Sorption and Transport of Water Vapor in Alginic Acid, Sodium Alginate, and Alginate-cobalt Complex Films by Asako Hirai; Hisashi Odani is a Materials Science article available to read on EtoBox.

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## Abstract The sorption and the transport of water vapor in films of alginic acid (G1), sodium alginate (G1Na), and alginate‐cobalt complex (G1Co) were studied at 30°C by employing the weighing method. Sorption isotherms for all films of G1, G1Na, G1Co were of type II in the Brunauer's classification. The integral absorption from, and desorption to, zero pressure were non‐Fickian type for all films studied. The mean permeability coefficient P, which was determined by the cup method, increased with the increase of vapor pressure, especially in the low vapor pressure region. P for G1Na was much higher than that for G1, which mainly reflects more hygroscopic nature of G1Na than that of G1. The values of P for G1Co were lower than those for G1 at lower pressures and then approached those for G1 at higher vapor pressures. Integral diffusion coefficient D evaluated as P/__S__, where the solubility coefficient S was evaluated from sorption isotherms, increased rapidly with increasing water concentration and then leveled off. In the concentration region studied, the magnitude of D and its dependence on concentration for H~2~O‐G1Na system did not differ much from those for H~2~O‐G1 system.

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Author

Asako Hirai; Hisashi Odani

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

1994

Language

EN

Field

Materials Science (Physical Sciences)