464 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS I.l.I .._l ß : 0.1 ' '" ':' .... :•'""""' ' '•' "" • 'i. ' ß ,.•. • o 0 .2 .4 .6 SPAN 2 0 TWEEN 20 WEIGHT FRACTION OF HYDROPHILIC SURFACTANT Figure 4. Photograph of vials containing surfactant-oil mixtures. (Each vial contains 15 g mineral oil, 2.5 g mixture of Tween 20 and Span 20, and small amounts of deionized water. Amounts of water in milliliters are indicated by numbers on left-hand edge of photograph. Weight fractions of Tween 20 in the surfactant mix- tures are printed under bottom row of vials)

OPTIMUM O/W EMULSIFICATION 465 N 15 lO F I WIO 30 20.• N 5 I 10 n' I cD I z I • I i.• I • I I I I O--MEAN DROPLET SIZE I /•---J• $OLUBILI ZATION LIMIT 0 0 0 .2 .4 .6 .8 1 ARLACEL 80 SDOS WEIGHT FRACTION OF ANIONIC SURFACTANT Figure 5. Solubilization-emulsion droplet size correlation for anionic-nonionic systems. (Emulsions contain 30 per cent mineral oil, 65 per cent deionized water, and 5 per cent surfactant mixtures. Surfactant mixtures consist of hydrophilic anionic sodium dioctyl sulfosuccinate, and lipophilic Arlacel 80 at ratios indicated by abscissa)

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