O/W type 에멀전에서 분산안정성 및 오일분해에 미치는 초음파의 영향

Abstract

At the present day, emulsification technology using surfactants have caused controversy for their toxicity and environmental damage. This paper proposes an emulsification method without using an emulsifier and investigated the effects of particle size distribution on the dispersion stability in emulsion. Oil in water(O/W type) emulsion was prepared with 1 wt.% of olive oil by using high speed agitation, high pressure and ultrasonic wave dispersion methods. The particle size distribution, microscopic observation and dispersion stability of each sample were compared and evaluated according to the various dispersion methods. As a result, it has been found that the emulsion particle size dispersed by using the ultrasonic wave dispersion method is the smallest(0.07 to 0.3 ㎛) and stable for a long time compared to the emulsion particles size created by any other methods. In this study, four kinds of olive oil emulsions were prepared by using ultrasonic wave dispersion technology and the dispersion stability of each sample was observed for 7 days. The particle size of emulsion were (A) 0.06 to 0.5 ㎛, (B) 0.35 to 5 ㎛, (C) 1 to 10 ㎛ and (D) 3.2 to 130 ㎛. Form these results, it was found that dispersion stability of emulsion with uniform particles size of not more than 0.5 ㎛ has very good stability. In addition, the effect of the irradiation of the ultrasonic wave(intermediate frequency) on the organic contaminant solution has been investigated. 0.1 wt.% phytoncide oil was used of a organic contaminant solution and observed the performance of physical decomposition to the phytonciede component. It was found that the unirradiated organic contaminant solution had not changed transparently over time and maintained the initial state. On the other hand, the irradiated organic contaminant solution showed that the transparency degree has changed to a good level after 3 days and became identical to the original purified water after a week. Analysis by GC/MS shoes that most of the phytoncide oil in the solution did not exist. Consequently, the intermediate frequency irradiation is considered a good method to purify the organic contaminant solution.