ISSN:
1435-1536
Keywords:
Nuclear magnetic resonance
;
pulsed field gradients
;
diffusion
;
emulsions
;
droplet size
;
concentrated emulsions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract In this contribution we suggest that nuclear magnetic resonance constitutes a promising technique for studying essential features of emulsions. The background of the method is discussed, and it is emphasized that the method determines the mean-squared displacements of molecules over distances of order 10−6 m. It is pointed out that such distances correspond to typical emulsion droplet sizes. As a consequence, the method, when applied to emulsions, yields information on droplet sizes and the presence of diffusional barriers. To exemplify this, two particular examples are discussed. The first pertains to the determination of droplet size distributions of emulsion, using data from two different systems, viz. a low-calorie spread and a multiple emulsion, as examples. The second example deals with concentrated emulsions, and it is shown that both dynamical (long-time diffusion and lifetimes in the droplets) and structural (droplet sizes) information can be obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01189487
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