Transfer phenomena across the oil phase in water-oil-water multiple emulsions evaluated by Coulter counter: 1. Effect of emulsifier 1 on water permeability
Transfer phenomena across the oil phase in water-oil-water multiple emulsions evaluated by Coulter counter: 1. Effect of emulsifier 1 on water permeability
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DOI：
10.1016/0021-9797(85)90067-0
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发表时间：
1985-04
影响因子：
9.9
通讯作者：
N. Garti;S. Magdassi;D. Whitehill
中科院分区：
文献类型：
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作者：
N. Garti;S. Magdassi;D. Whitehill
众所周知，在水-油-水(w/o/w)多相乳状液中存在诸如电解质之类的添加剂会影响其稳定性(1，2)。决定W/O/W乳状液稳定性的一个重要因素似乎是作用于分隔内外水相的油相层的渗透压差，这种渗透压差是由电解质或其他成分的存在造成的。如果渗透不平衡非常严重，则内部水似乎会由于油层的破裂而迅速流失到外部水相中。然而，在较低浓度的电解液中，水可能会在水相之间传输，导致内部水滴的收缩或扩大，这取决于渗透梯度的方向。这表现在包裹水滴的“多个”(油)液滴的大小发生了变化。戴维斯和伯贝奇描述了一种使用库尔特计数器测量W/O/W乳状液中水传输的简便方法(3)。这包括测定一段时间内Aw/o/w乳状液中多个液滴的尺寸分布。
The presence of additives such as electrolytes in wateroil-water (w/o/w) multiple-phase emulsions is known to influence their stability (1, 2). An important factor in determining the stability of w/o/w emulsions appears to be the osmotic pressure difference acting across the oil phase layer separating the internal and external aqueous phases, created by the presence of electrolytes or other components.If the osmotic imbalance is extreme, the internal water appears to be lost rapidly to the external aqueous phase by rupture of the oil layer. At lower concentrations of electrolyte, however, water may be transported between the aqueous phases resulting in either shrinkage or enlargement of the internal aqueous droplets depending on the direction of the osmotic gradient. This is manifested in a change in size of the" multiple"(oil) drop which entraps the aqueous droplets. A convenient method for measuring water transport in w/o/w emulsions using a Coulter Counter was described by Davis and Burbage (3). This involved determination of the size distribution of the multiple drops in aw/o/w emulsion over a period of time.