Abstract
In this article, two emulsification techniques providing nanoemulsions, which are condensation method and dispersion method, are described. Nanoemulsions by condensation method was prepared by cooling single phase microemulsions to temperature below the solubilization phase boundary. Key process of the second dispersion method was the homogenization of coarse emulsions with water phases containing large amounts of water-soluble solvents by a high-pressure homogenizer. Then the application and function of nanoemulsions for cosmetics are reviewed. An aqueous wax nano-dispersion was prepared through the cooling procedure of microemulsions which was made above the melting temperature of wax. The formula of the dispersion can be used for hair spray and hair mist having a low viscosity. O/W cream containing surfactant and amphiphile also became transparent with a low viscosity by the reduction of emulsion droplet size. This technology can give lotion type cosmetics with an excellent function that can be found in O/W cream.
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