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KMID : 0604520120380030201
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Journal of the Society of Cosmetic Scientists of Korea
2012 Volume.38 No. 3 p.201 ~ p.207
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Study of Nano-emulsion Formation by Different Dilution Method
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Cho Wan-Goo
Han Sang-Kil
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Abstract
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The influence of different dilution procedures on the properties of oil-in-water (O/W) nano-emulsions obtained by dilution of oil-in-ethanol (O/E) microemulsions with water has been studied. The system water/ethanol/ nonionic surfactant/silicone oil with ethanol was chosen as model system. The dilution procedures consisted of adding water (or microemulsion) stepwise. By mixing O/E microemulsions into water, nano-emulsions with droplet diameters of 30 nm were obtained. In contrast, by mixing water into O/E microemulsion, emulsions with diameter of 400 nm were obtained The dilution methods were shown to be a key factor determining the properties of the emulsions. There were no change in diameters of nanoemulsion droplets against time, however sizes of droplets in the emulsion with larger droplets were increased with time and the mechanism of unstability was thought to be Ostwald ripening.
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KEYWORD
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nanoemulsions, microemulsions, self-emulsification, dilution
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