Universal Surfactant for Water, Oils, and CO2

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• 作者：Azmi Mohamed ; Kieran Trickett ; Swee Yee Chin ; Stephen Cummings ; Masanobu Sagisaka ; Laura Hudson ; Sandrine Nave ; Robert Dyer ; Sarah E. Rogers ; Richard K. Heenan ; Julian Eastoe
• 刊名：Langmuir
• 出版年：2010
• 出版时间：September 7, 2010
• 年：2010
• 卷：26
• 期：17
• 页码：13861-13866
• 全文大小：842K
• 年卷期：v.26,no.17(September 7, 2010)
• ISSN：1520-5827

文摘

A trichain anionic surfactant sodium 1,4-bis(neopentyloxy)-3-(neopentyloxycarbonyl)-1,4-dioxobutane-2-sulfonate (TC14) is shown to aggregate in three different types of solvent: water, heptane, and liquid CO₂. Small-angle neutron scattering (SANS) has been used to characterize the surfactant aggregates in water, heptane, and dense CO₂. Surface tension measurements, and analyses, show that the addition of a third branched chain to the surfactant structural template is critical for sufficiently lowering the surface energy, tipping the balance between a CO₂-incompatible surfactant (AOT) and CO₂-philic compounds that will aggregate to form micelles in dense CO₂ (TC14). These results highlight TC14 as one of the most adaptable and useful surfactants discovered to date, being compatible with a wide range of solvent types from high dielectric polar solvent water to alkanes with low dielectrics and even being active in the uncooperative and challenging solvent environment of liquid CO₂.