Diffusion in an inhomogeneous system: NMR studies of diffusion in highly concentrated emulsions

Summary, in English

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; hept

ne was used as the oil phase. The surfactants, used to stabilize the emulsion, were soybean phosphatidylcholine and C12EO4. The water drops were about 1.5 mum 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. (C) 2003 Elsevier Science (USA). All rights reserved.

• Author: Carin Malmborg; Daniel Topgaard; Olle Söderman
• Department/s: Physical Chemistry
• Publishing year: 2003
• Language: English
• Pages: 270-276
• Publication/Series: Journal of Colloid and Interface Science
• Volume: 263
• Issue: 1
• Links: http://dx.doi.org/10.1016/S0021-9797(03)00259-5
• Document type: Journal article
• Publisher: Elsevier
• Topic: Physical Chemistry
• Keywords: Diffusometry; Self-diffusion; Highly concentrated emulsion
• Status: Published
• ISBN/ISSN/Other: ISSN: 1095-7103