A nuclear magnetic resonance (nmr) investigation of the micellar structure of a long-chain non-ionic surfactant.
Peak integrals, peak widths at half-height (delta nu 1/2), spin-lattice relaxation times (T1), and chemical shifts (delta) of the alkyl and oxyethylene protons of CH3(CH2)21[OCH2CH2]27OH (C22E27) were measured in D2O at various temperatures. The peak integrals, delta nu 1/2, and delta values of the alkyl protons showed a large dependence on temperature below 313K, while the values for the oxyethylene protons were unaffected by temperature. These observations were explained by considering an intrusion of some oxyethylene groups into the hydrocarbon core of the micelle.
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003102:Colloids; D009682:Magnetic Resonance Spectroscopy; D008823:Micelles; D011092:Polyethylene Glycols / Q000032:analysis*; D013501:Surface-Active Agents / Q000032:analysis*; D013696:Temperature
D003102:Colloids; D008823:Micelles; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; C043444:octadecyl polyoxyethylene ether