Nanostructured Microemulsion Phase Behavior Using AOT or Extended Surfactant Combined with a Cationic Hydrotrope

• 作者: Hala Yousef Ibrahim Kayali Khalid Kanan
• 来源期刊: 表面工程材料与先进技术期刊(英文)
• 学科: 化学
• 关键词: Middle Phase MICROEMULSION CATIONIC Hydrotrope Ultra Low INTERFACIAL Tension
• 年，卷（期）: bmgcclyxjjsqkyw_2012,（1）
• 页码范围: 53-60
• 页数: 8页
• 分类号: O6

摘要

The phase behavior for systems containing sodium bis (2-ethylhexyl sulfosuccinate) (AOT), with the cationic hydro-trope tetraethyl ammonium chloride (TEAC), in the presence of water and heptane were studied. Formulations of mi-croemulsion for such systems and for systems containing the so called “extended surfactant” were carried out at different salt concentrations. Anisotropy was detected using cross polarizers and polarized microscopy. Ultralow interfacial tension for microemulsion was measured, first theoretically using the Chun-Huh equation, and then experimentally using spinning drop experiments. The presence of short chain hydrotropes (TEAC) was found to destabilize the liquid crystalline region, observed in the AOT/water/heptane phase diagram. Ultralow interfacial tensions were observed for microemulsions formulated with surfactant concentrations as low as 0.5%, for both AOT and “extended surfactant” systems. The effect of temperature on the phase behavior of a microemulsion formed with AOT system was studied and found to behave in an opposite manner compared to the nonionic surfactant.