Neutron Spin Echo Studies on Correlation between Membrane Undulations and Mesoscopic Structures in Complex Fluids Involving Amphiphiles

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We have improved our neutron spin echo (NSE) spectrometer (ISSP-NSE) using this grant. The polarizing mirrors for the polarizer and the analyzer were replaced with FeCo/Si supermirrors obtained by collaboration with HMI Berlin. A total polarization of the new set of the polarizer and the analyzer was over 90%. After examination of polarizing supermirrors such as FeCo/TiNx remanent one obtained from SwissNeutronics using this grant, a 6 m bender guide polarizer and a wide cross section multi-channel bender guide analyzer which consisted of remanent polarizing supermirrors provided from SwissNeutronics were purchased by ISSP and wide cross section spiral correction coils were developed using this grant in order to upgrade ISSP-NSE. We have developed the new-type spin flippers, which operate with steady current for a white neutron beam, for a time-of-flight NSE spectrometer at a pulsed spallation neutron source (JSNS) in J-PARC. NSE and small angle scattering experiments have been performed in order to study dynamics such as membrane undulation, mesoscopic structures and the temperature- and the pressure-induced structural phase transition in complex fluids involving amphiphiles such as dipalmitoylphosphatidylcholine(DPPC)/water/CaCl_2 systems, the non-ionic surfactant C_<12>E_5/ oil/water systems and ionic surfactant AOT/oil/water systems.