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The Effects of Ethanol on Nano-emulsion Prepared by High-energy Emulsification Method  

Won, Bo-Ryoung (Department of Fine Chemistry, College of Nature and Life Science, Seoul National University of Technology)
Park, Soo-Nam (Department of Fine Chemistry, College of Nature and Life Science, Seoul National University of Technology)
Publication Information
Journal of the Society of Cosmetic Scientists of Korea / v.35, no.3, 2009 , pp. 179-191 More about this Journal
Abstract
The objective of this study was to investigate the effect of ethanol on the emulsion prepared by poly(oxyethylene) hydrogenated castor oils (HCOs)/oil/ethanol/water system. Emulsions were prepared using homogenizer as high-energy method. To evaluate effect of ethanol on the emulsion, physical properties such as droplet size and size distribution were determined and other components were almost fixed to analyze the effect of ethanol on the surfactant. In case of HCO-20, the droplet diameter was in micrometers and the droplet size was gradually deceased as the ethanol concentration was increased. The droplet diameter of nano-emulsion containing 4.00 % of HCO-30 was shown in nanometers and its mean droplet size was $128.15{\pm}1.06nm$ and the most stable at the 4.25 % of ethanol contents by the Form. 1 and $136.10{\pm}0.99nm$ at the 3.50 % of ethanol contents by the Form. 2. Similarly, the droplet diameter of nano-emulsion containing 4.00 % of HCO-40 and 4.50 % ethanol by the Form. 1 was $115.85{\pm}0.78nm$ and $121.15{\pm}0.35nm$ at the 3.25 % of ethanol by the Form. 2 and both size distributions were also narrow. Finally, the droplet size of nano-emulsion containing 4.00 % of HCO-60 and 2.25 % ethanol was $262.35{\pm}0.64nm$ and the most stable. The higher ethanol concentrations became the smaller size of emulsion became in the microscale emulsion but we determined nano-emulsion had a minimum size at a certain ethanol concentration. The results showed that the breakdown process of this nano-emulsion could be attributed to Ostwald ripening. This study about effect of ethanol on the emulsion showed that ethanol contents to prepare a stable emulsion could be determined as studying the effect of ethanol on the emulsion with the type of surfactants.
Keywords
nano-emulsion; high energy method; poly(oxyethylene) hydrogenated castor oils (HCOs); size distribution; Ostwald ripening;
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