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Neutron Spin Echo Spectroscopy (NSE) PowerPoint Presentation
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Neutron Spin Echo Spectroscopy (NSE)

Neutron Spin Echo Spectroscopy (NSE)

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Neutron Spin Echo Spectroscopy (NSE)

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  1. Neutron Spin Echo Spectroscopy(NSE) Group B Ilir Zoto Tao Hong Yanmei Lan Nikolaos Daniilidis Sonoko Kanai Mitra Yoonesi Zhaohui Sun 2003 Summer School NCNR, NIST Gaithersburg, MD 20890

  2. NSE Time scale ~ 1 - 10 ns Size scale 1-100 Å shape fluctuations Spontaneous curvature, bending elasticity, Dynamics of particles k) Diffusion (T, h, r, R • NMR (Pulsed Field Gradient) s and higher • Dynamic light scattering s –ms, 1-100 nm

  3. Surfactant molecule Hydrophilic head Hydrophobic tail Inverse spherical micelle D2O ~ 25 AOT AOT C10D22 C10D22 Experiment AOT Experiment I of AOT micelles in C10D22 (5.4 % vol. fraction) Experiment II AOT/D2O/C10D22 (5.4/4.6/90 % vol. fraction) Inverse microemulsion droplet

  4. • elastic scattering • inelastic scattering   0 ± 0  <cos(±)> Angle ! B Principle of NSE L Neutrons posses spin and magnetic moment. They precess in magnetic fields with the Larmor frequency that depends on the strangth of the magnetic field only. (g =1.83108 s-1T-1) S N B B sample n

  5. Experiment II AOT/D2O/C10D22 microemulsion Goal Experiment I AOT micelles in C10D22

  6. Q Results

  7. Å2/ns Å Results

  8. Conclusion NSE is suitable for studies on: Diffusion of micelles/microemulsion Form Deformation http://dept.physics.upenn.edu/ ~pcn/mcgraw2/mcglatex.html

  9. Acknowledgement Dobrin P. Bossev, Steve Kline, and Nicholas Rosov NCNR, NIST