Mercredi 21 juillet 2010 à 11h - salle O. Kahn
Pr. K.V. RAMANATHAN, NMR Research Centre, Indian Institute of Science Bangalore, India
A Tale of Two Techniques "Cross- Polarisation and Magic Angle Spinning Applied to Oriented Partially Ordered Systems"
ABSTRACT :
Cross-Polarisation (CP) and Magic Angle Spinning (MAS) are two techniques well-known in NMR and being used extensively to study a variety of organic, inorganic, polymeric and biological systems in the solid state. When applied to partially ordered systems that orient in a magnetic field, these techniques yield results, which are different from the ones obtained from rigid solid powder samples. The properties of the systems lend themselves to be exploited with these techniques and yield parameters that are useful for structure and dynamics studies. The talk will elaborate on the above methodologies applied to nematic liquid crystals and cover particularly topics such as development of new pulse schemes for polarization transfer, improved SLF pulse sequences and variable angle spinning studies. Such studies provide an ideal test-bed for developing methodologies which have applications to other similar systems such as biological membranes. The details will be elaborated.
CONTACT : Prof. K.V. Ramanathan
E-mail : kvr@nrc.iisc.ernet.in / Web-site : http://nrc.iisc.ernet.in/
CONTACT : Dr. Philippe Lesot / DR CNRS
Tél. : 33 (0)1 69 15 47 59 / Fax : 33 (0)1 69 15 81 05
E-mail : philippe.lesot@u-psud.fr