Coulter counter 1116 INDEX

Coulter Counter operational conditions Gain index 4 Aperture 100 microns... 

The phase difference between he "particles" (which were detected by the Coulter Counter) and oil droplets of the same size was determined. This phase difference was large. This meant that the refractive index of the "particles" was different than the refractive index of the crude. The "particles" therefore were not oil droplets. This only leaves the possibility that they were micellar aggregates of surfactant. However, it is possible that there was some crude oil dissolved in the hydrophobic cores of the micelles that constitute these aggregates. 

An examination of technical literature and trade publications indicates that a wide variety of instmments are commercially available for PSD analysis.The classical methods are based on either electrical properties (e.g., the Coulter Counter principle) or optical properties (e.g., laser scattering) of the analyte. However, none of these techniques are separation methods. Because particulate dispersions are often highly complex in terms of the polydispersity index, multimodal size distribution, and density, it is hardly possible, without the use of separative methods, to obtain an accurate determination of their... 

Geometric mean diameters (dg ) and geometric standard deviations (ag) of the particle size distribution obtained with the Coulter Counter in inert and swelling media and relevant swelling indexes. 

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