title: Segmental order parameters in a nonionic surfactant lamellar phase studied with 1H-13C solid-state NMR.
abstract: A lyotropic nonionic lamellar system composed of pentaethyleneglycol mono n-dodecyl ether and D(2)O was studied using natural abundance (13)C NMR under magic-angle spinning. Applying a two-dimensional recoupling method proposed by Dvinskikh (R-PDLF), (1)H-(13)C dipolar couplings were estimated over a range of temperatures (300-335 K), thus enabling analysis of structural changes in the liquid crystalline system. The results obtained are used to correlate the conformation and mobility of local sites in the surfactant molecule with overall changes in the lamellar structure.
authors.affiliation: Department of Physical Chemistry 1, Lund University, Lund, Sweden. Tiago.Ferreira@fkem1.lu.se
authors.forename: Tiago Mendes
authors.initials: TM
authors.lastname: Ferreira
authors.forename: Bruno
authors.initials: B
authors.lastname: Medronho
authors.forename: Rachel W
authors.initials: RW
authors.lastname: Martin
authors.forename: Daniel
authors.initials: D
authors.lastname: Topgaard
mesh_terms: D002247:Carbon Isotopes; D004987:Ethers / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards; D008968:Molecular Conformation; D044367:Phase Transition; D011092:Polyethylene Glycols / Q000737:chemistry*; D011522:Protons; D012015:Reference Standards; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature
chemical_list: D002247:Carbon Isotopes; D004987:Ethers; D011522:Protons; D013501:Surface-Active Agents; C077053:pentaethylene glycol monododecyl ether; D011092:Polyethylene Glycols