The effect of dispersed phase on the stability of emulsion system with polyoxyethylene dodecyl ethers and their variation of ethylene oxide moles was studied by such methods as interfacial tension measurement, configuration and droplet size variation with time. The experiments showed that, in interfacial tension measurement, long chain alkanols into dispersed phases are more effectively adsorbed onto interface, while long chain alkanes nearly not, and in centrifugation, dispersed phase with alkanols is less seperated than that with alkanes. On the other hand, alkanes help more stabilyzing emulsion than alkanols in droplet size variation. And the addition of NaCl or Urea, and variation of E.O. moles have very slight effects on the stability with alkanes than with alkanols. Moreover, the longer carbon chain lenght is, dispersed phase is more effective on emulsion stability. Supposed from these facts is that more stable emulsion can be made with alkanes which retard molecular diffusion by water solubility decreased rather than alkanols which raise resistance to coalescence by rigid interfacial mixed monolayers formation. In conclusion, the stabilities of these emulsions are proved to be more influenced by molecular diffusion than coalescence.

폴리옥시에틸렌 도데실 에테르 유도체로 안정화된 헥산-물의 유화계에서 소량의 장쇄알칸 및 장쇄알칸올이 유화안정도에 미치는 효과를 비교검토하였다 장쇄알칸의 첨가는 계면장력 및 원심분리에 의한 유화안정도에 거의 영향을 주지 않았으나 장쇄알칸올은 계면장력을 현저 저하시켰으며, 원심분리시 coalescence에 의한 유화파괴 방지에 효과적이었다. 그러나 시간경과에 따른 유화안정도는 장쇄알칸이 장쇄알칸올보다 더욱 효과적이었고 또 탄화수소쇄 길이가 길어질수록 더욱 효과적이었다. 이러한 것은 유화제를 변경시켰을 경우도 마찬가지였다. 이것은 장쇄알칸을 첨가함으로써 분산상의 소수결합력을 증대시켜 물에 대한 공해도가 감소되어 분자확산에 의한 유화파괴가 어려워지기 때문이다. 즉 이러한 유화계에서 유화파괴는 coalescence 보다는 분자확산에 의해 지배됨을 알 수 있다.