Citation: Hao Jing-Cheng, Wang Han-Qing, Ge Jin-Huan. Studies on the Sturctures of Microemulsions[J]. Acta Physico-Chimica Sinica, 1997, 13(07): 593-597. doi: 10.3866/PKU.WHXB19970704
微乳液结构的研究
测定了十二烷基磺酸钠（As）／正丁醇／20％苯乙烯／水体系的相平衡. 用冷冻刻蚀、ESR、FT－IR研究了上述体系微乳液的结构. 研究表明，苯乙烯含量恒定时（20％），随着体系中水含量增加，电导确定的双连续结构的徽乳液经历着从油包水（W／O）到双连续（BC）再到水包油（O／W）变化．FT－IR测定表明，W／O微乳液较O／W微乳液的OH伸缩振动和弯曲振动频率有显著减小，说明W／O微乳液中氢键缔合要比O／W强得多. ESR测定表明O／W微乳液的旋转相关时间高于W／O微乳液，说明O／W微乳液“界面”的微观粘度高于W／O微乳液“界面”的微观粘度.
English
Studies on the Sturctures of Microemulsions
The isothermal phase diagram for the system sodium dodecyle sulfonate/n-butanol/20% styrene/water has been determined at 40 ℃ The freeze fracture electron microscope, ESR, FT-IR have been used for determining the structures of microemulsions. The investigation shows that, with the increase of H2O-content the bicontinuous structural microemulsions determined by conductivity measurement under a change from W/O to bicontinuous (BC) and to O/W when the content of styrene is constant (20%). The stretching vibration and the bending vibration frequencies of OH in W/O microemulsions are less than those in O/W microemulsions, which indicates that the association strength of the hydrogen bonds in W/O microemulsions are much stronger than those in O/W microemulsions. The correlation times, τc, in O/W microemulsions, are longer than that in W/O microemulsions, indicating that the microviscosity in O/W microemulsion interface is higher than that in W/O microemulsion interface.
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Key words:
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Sodium dodecyle sulfonate
- / ESR
- / FT-IR
- / Freeze fracture electron microscope
- / Structures
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