Emulsifier-Free Emulsions

SAKAI Toshio

doi:10.4011/shikizai.93.105

<p>Colloidal stability of oil-in-water (O/W) emulsions in the absence of any emulsifiers such as surfactants (named as emulsifier-free O/W emulsions) has been investigated to understand the metastable state of O/W emulsions. Colloidal stability (metastable state) of emulsifier-free O/W emulsions depends on the physical properties of oil as a dispersed phase. In particular, the solubility of oil to water is an important physical property to determine the colloidal stability (metastable state) of emulsifier-free O/W emulsions because the solubility of oil to water enhances the Ostwald ripening which is the diffusion of oil molecules through the water (continuous phase) from smaller oil droplets to larger oil droplets. So, if the reversible molecular diffusion among oil droplets (from smaller oil droplets to larger oil droplets and vice versa) was achieved in emulsifier-free O/W emulsions, the metastable state of emulsifier-free O/W emulsions should be retained in the long term. Then, we considered that the reversible diffusion of oil molecules among oil droplets in the emulsifier-free O/W emulsion would be achieved by oils blending because of the diffusion of oil molecules from smaller oil droplets to larger oil droplets driven by different sizes of oil droplets (Ostwald ripening) (that is described by Kelvin's law) and the diffusion of oil molecules from larger oil droplets to smaller oil droplets driven by difference concentrations of another oil in oil droplets (that is described by Raoult's law). Indeed, the long-term colloidal stabilization of emulsifier-free O/W emulsions was achieved by oils blending.</p>

Emulsifier-Free Emulsions

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