Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

摘要: Abstract The interface polarity of benzyl- n -hexadecyldimethylammonium chloride (BHDC) cationic reversed micelles in benzene was studied and compared with those the anionic systems sodium 1,4-bis-2-ethylhexylsulfosuccinate (AOT) hexane. nonionic poly(oxyethylene) dodecyl ethers type surfactants Brij 30 benzene, cyclohexane, decane C 12 E 5 hexane, heptane, were also investigated. 1-Methyl-8-oxyquinolinium betaine (QB) used as optical probe. influence surfactant concentration W = [H 2 O]/[surfactant] analyzed a function absorption bands shifts visible, B 1 , UV, absorbances ratio these bands. At 0 sensed micelle interfaces AOT–hexane AOT–benzene is entirely similar while for BHDC–benzene quite smaller. detected interaction between QB BHDC may favor entrance into oil side thus sensing less polar environment. ≥ 10 once heads are completed hydrated, well show same behavior. aliphatic hydrocarbons comparable. However at their micropolarity higher than that AOT–hexane, showing formation hydrogen bond free OH groups major factor affecting microenvironment. In all even maximum possible by never reaches value pure water, is, bulk water phase prevailing micellar core.