title: Critical fluctuations in DOPC/DPPC-d62/cholesterol mixtures: 2H magnetic resonance and relaxation.
abstract: Static and magic angle spinning (MAS) (2)H nuclear magnetic resonance experiments have been performed on a series of multilamellar dispersions of di-oleoyl-sn-glycero-3-phosphocholine/di-palmitoyl-sn-glycero-3-phosphocholine-d62/cholesterol in water to investigate the compositional fluctuations which occur in the region of the line of critical points for this ternary system. The strong dependence of the MAS line widths on temperature, sample composition, and spinning rate provides a direct measure of the magnitude of the fluctuations in the (2)H quadrupolar Hamiltonian. These data are analyzed in terms of models for critical fluctuations in composition leading to a value for the critical index for the correlation length, ν(c) = 0.628, consistent with a three dimensional Ising model.
authors.affiliation: Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada. jdavis@uoguelph.ca
authors.forename: James H
authors.initials: JH
authors.lastname: Davis
authors.forename: Latifa
authors.initials: L
authors.lastname: Ziani
authors.forename: Miranda L
authors.initials: ML
authors.lastname: Schmidt
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry*; D002784:Cholesterol / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D044367:Phase Transition; D010715:Phosphatidylglycerols / Q000737:chemistry*; D013696:Temperature
chemical_list: D010715:Phosphatidylglycerols; D015060:1,2-Dipalmitoylphosphatidylcholine; C043806:dioleoylphosphatidylthioglycerol; D002784:Cholesterol