Spontaneous emulsification of oils containing hydrocarbon, nonionic surfactant, and oleyl alcohol
Spontaneous emulsification of oils containing hydrocarbon, nonionic surfactant, and oleyl alcohol
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DOI：
10.1006/jcis.1998.5865
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发表时间：
1999-01-01
影响因子：
9.9
通讯作者：
Miller, CA
中科院分区：
文献类型：
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作者：
Rang, MJ;Miller, CA
采用相行为和视频显微镜实验研究了正十六烷/油醇/C12 E6混合物在30 ℃水中的自发乳化。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，从而许多油滴成核时，才发生油相滴完全乳化形成直径约1 μ m的小油滴。当初始油滴的烃/醇比接近平衡体系在该温度下（即在相转化温度（PIT）下）的过量油相的烃/醇比时，并且当表面活性剂含量足够高时，发生这种行为。通过浊度测量研究了这些乳液的稳定性。最稳定的乳液似乎发生在液滴被一层层状相包覆的条件下。(C)北京：科学出版社.
Phase behavior and videomicroscopy experiments were used to investigate spontaneous emulsification of n-hexadecane/oleyl alcohol/C12E6 mixtures in water at 30 degrees C. It was found that complete emulsification of a drop of the oil phase to form small oil droplets having diameters of about 1 mu m 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. (C) 1999 Academic Press.