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Diffusion in an inhomogeneous system: NMR studies of diffusion in highly concentrated emulsions by Carin Malmborg; Daniel Topgaard; Olle Söderman is a Chemistry article available to read on EtoBox.

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In this study the self-diffusion of different species in highly concentrated water-in-oil emulsions was investigated by means of the NMR diffusometry approach. The emulsions contained 96% aqueous solutions of salt or other additives; heptane was used as the oil phase. The surfactants, used to stabilize the emulsion, were soybean phosphatidylcholine and C(12)EO(4). The water drops were about 1.5 microm in diameter according to diffusion measurements performed on water. Diffusion of tetramethyl ammonium ions and glucose between the emulsion droplets was found to be negligible on the relevant time-scale (<1 s). On the contrary, acetic acid/acetate ions diffused between the droplets and had exchange times which were a function of pH.

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Author

Carin Malmborg; Daniel Topgaard; Olle Söderman

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)