Abstract
In 1972 Packer and Rees described a method for the determination of droplet size distributions in emulsions using the pulsed field gradient (PFG) NMR spin—echo technique. This paper describes an improved method, based on this earlier work, which is directed at the routine determination of water droplet size distributions of water-in-oil emulsions. The improvement is based on the recognition that a set of echo attenuation values ( R) as a function of the field gradient pulse width, obtained under conditions where R is independent of the time allowed for diffusion, contains all the necessary information on the water droplet size distribution. The parameters of a log-normal distribution of water droplet sizes are easily obtained from a small number of measurements which are then compared with a matrix of sets of theoretical echo attenuations, representing different combinations of these parameters, using a simple computer program. The method is described and examples of results are shown. The effect of temperature on the measurements is discussed.
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