Rang MJ, Miller CA
Department of Chemical Engineering, Rice University, Houston, Texas, 77251-1892
J Colloid Interface Sci. 1999 Jan 1;209(1):179-192. doi: 10.1006/jcis.1998.5865.
Phase behavior and videomicroscopy experiments were used to investigate spontaneous emulsification of n-hexadecane/oleyl alcohol/C12E6 mixtures in water at 30 degreesC. It was found that complete emulsification of a drop of the oil phase to form small oil droplets having diameters of about 1 µm occurred only when diffusion of water into the initial oil drop first converted it completely into the lamellar liquid crystalline phase and/or a microemulsion and then caused this phase (or these phases) to become supersaturated in oil so that many oil droplets nucleated. This behavior occurred when the hydrocarbon/alcohol ratio of the initial oil drop was near that of the excess oil phase for a balanced system at this temperature, i.e., at the phase inversion temperature (PIT), and when surfactant content was sufficiently high. The stability of these emulsions was investigated by means of turbidity measurements. The most stable emulsion appeared to occur under conditions where the drops were coated by a layer of the lamellar phase. Copyright 1999 Academic Press.
采用相行为和视频显微镜实验研究了正十六烷/油醇/C12E6混合物在30℃水中的自发乳化现象。结果发现，只有当水扩散到初始油滴中首先将其完全转化为层状液晶相和/或微乳液，然后使该相（或这些相）在油中变得过饱和从而形成许多油滴核时，一滴油相才能完全乳化形成直径约为1 µm的小油滴。当初始油滴的烃/醇比接近该温度下平衡体系中过量油相的烃/醇比时，即在相转变温度（PIT）时，以及当表面活性剂含量足够高时，会出现这种行为。通过浊度测量研究了这些乳液的稳定性。最稳定的乳液似乎出现在液滴被一层层状相包覆的条件下。版权所有1999年学术出版社。
