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Improvement of our neutron spin echo (NSE) spectrometer and NSE studies on dynamics in complex fluids

改进我们的中子自旋回波 (NSE) 谱仪以及复杂流体动力学的 NSE 研究

基本信息

批准号：
16540289
负责人：
TAKEDA Takayoshi
金额：
$ 2.24万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540289/
关键词：
neutron spin echo dynamics complex fluids membrane amphiphiles lipid neutron scattering surfactant

项目摘要

The purpose of this project is to improve our neutron spin echo spectrometer iNSE and to investigate mesoscopic parameters like the bending modulus on the local scale of the interfacial membrane deduced from the dynamical structure factor using neutron spin echo spectroscopy (NSE) in order to elucidate the self-assembling mechanisms in complex fluids involving amphiphiles. Correction coils such as wide cross section spiral correction coils developed using this grant led to great upgrade of iNSE and the observed neutron efficiency increased more than ten times. 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. The performance test of the new-type spin flippers improved using this grant showed that the flippers worked well for a pulsed white neutron beam. We have studied 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/water/ethanol systems and ionic surfactant AOT/oil/water systems by means of NSE and small angle scattering experiments.

本项目的目的是改进我们的中子自旋回波谱仪iNSE和调查介观参数，如弯曲模量的局部尺度上的界面膜推导出的动力学结构因子使用中子自旋回波谱（NSE），以阐明在复杂的流体中的自组装机制，包括两亲物。使用该资助开发的校正线圈，如宽截面螺旋校正线圈，导致iNSE的大幅升级，观察到的中子效率提高了十倍以上。我们研制了一种新型的自旋翻转器，用于日本PARC脉冲散斑中子源（JSNS）上的NSE飞行时间谱仪，它能稳定工作于白色中子束流。利用该资助改进的新型自旋鳍板的性能测试表明，该鳍板对脉冲白色中子束具有良好的工作性能。本文利用NSE和小角散射实验研究了两亲物在二棕榈酰磷脂酰胆碱（DPPC）/水/CaCl_2体系、非离子表面活性剂C_<12>E_5/水/乙醇体系和离子表面活性剂AOT/油/水体系中的膜起伏、介观结构以及温度和压力诱导的结构相变等动力学过程。