AUTHOR=Fernández-Stefanuto Verónica , Somoza Alba , Corchero Raquel , Tojo Emilia , Soto Ana 

TITLE=Design and Characterization of Naphthalene Ionic Liquids

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00208

DOI=10.3389/fchem.2020.00208

ISSN=2296-2646

ABSTRACT=Surfactants have a great number of applications. Among these chemicals, petroleum sulfonates have been widely used due to their effectiveness reducing interfacial tension. This is the case of sodium octylnaphthalene sulfonate which is a solid with a very low solubility in water. To overcome these drawbacks, this work aimed to synthesize new surface active ionic liquids based on a naphthalene sulfonate anion and traditional cations of these salts (imidazolium, pyrrolidinium and pyridinium). The new chemicals showed high thermal stability, ionic liquid nature, and a stronger surfactant character than the original naphthalene. Moreover, they were found to be water soluble which greatly facilitates their applications in the form of aqueous formulations. 1-Hexyl-3-methylimidazolium 4-(n-octyl)naphthalene-1-sulfonate showed the best capacity to reduce water-air and water-oil interfacial tension.