Measurement Technology of W/O Spread Dispersed Droplet Diameter Using an Optical Microscope

概要

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We have studied a method which addresses the problem of precision measurement of dispersed droplet diameter in W/O emulsions and W/Ospreads.With the usual methods of centrifugal sedimentation, etc., used to measure dispersed droplet diameter in W/O emulsions and W/O spreads, errors in measurement result from sheer stress which causes droplet collapse and droplet agglomeration, as well as from the presence of other solids. To address this problem, measurement by means of an image analyzer using an optical microscope for direct observation of dispersed droplet diameter in sample material made it possible to eliminate the above mentioned causes of error. Since use of an optical microscope made precise measurement possible, this report examines W/O spread dispersion medium, dispersion method and measurement temperature. For the measurement of W/O spread, using liquid oil with hydrophobic emulsifier as the dispersion medium, it was found that heating to a temperature of 40°C was suitable. Based on these results, it is possible to suitably assess W/O spread products.