MICROEMULSIONS OF TRIGLYCERIDE AND NONIONIC SURFACTANT - EFFECT OF TEMPERATURE AND AQUEOUS-PHASE COMPOSITION

被引:30
作者
JOUBRAN, RF
CORNELL, DG
PARRIS, N
机构
[1] U.S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Philadelphia, PA 19118
关键词
AQUEOUS PHASE COMPOSITION; MICROEMULSIONS; NONIONIC SURFACTANT; TEMPERATURE; TRIGLYCERIDE;
D O I
10.1016/0927-7757(93)80194-J
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The phase behavior of soybean oil, polyoxyethylene (40) sorbitol hexaoleate and water-ethanol was investigated. Regions of water-in-oil (W/O) microemulsions were determined and were found to be strongly dependent on temperature and water: alcohol ratios. At a water: ethanol ratio of 80/20 (wt.%), an oil: surfactant ratio of 2/3 and a temperature of 25-degrees-C, the microemulsion region extended continuously' from the oil-surfactant axis to the phase diagram center. However, at the hydrophilic-lipophilic balance (HLB) temperature (20-22-degrees-C) and a water:ethanol ratio of 80/20 or 75/25 (wt.%), a single-phase area separated from the original microemulsion region. Conductivity measurements and dynamic light scattering intensities at 25-degrees-C indicated that association structures were formed with increasing aqueous phase concentrations above 15 wt.%. At 20-degrees-C, the single-phase scattering intensities increased sharply with increasing aqueous phase concentrations (38-46 wt.%) and a plateau in the conductivity was detected. Transmission electron microscopy results supported the finding that more particles are formed with increasing aqueous phase and form connected particles, resulting in constant conductance.
引用
收藏
页码:153 / 160
页数:8
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