Solid-state Nuclear Magnetic Resonance (SS-NMR) is a powerful spectroscopic technique offering unique information about the structure and the dynamics of materials at a molecular scale. This method is frequently used to characterize various types of materials for energy storage, catalyst, health and construction. As non-invasive method, SS-NMR is especially suitable to study materials in different states: amorphous (polymers, glasses), disordered (battery materials), soft (liquid crystals, gels, pastes) or heterogeneous (catalyst, nanomaterials). However, SS-NMR suffers of a low sensitivity of detection due to a low nuclear spin magnetization at thermal equilibrium. The lack of sensitivity of SS-NMR is a major limitation to solve important questions for materials chemistry.<br/>In this respect, different strategies have been developed to boost the NMR sensitivity. It mainly concerns methods that enhance the nuclear polarization such as the Dynamic Nuclear Polarization (DNP). DNP is a hyperpolarization technique that increases the signal intensity in NMR by several orders of magnitude. The basic principle is to transfer the high electron spin polarization to surrounding nuclear spins by sample irradiation at a frequency close to the EPR transitions. The material of interest is mixed with a solvent containing a source of electron, then SS-NMR Magic Angle Spinning (MAS) experiments are performed at high magnetic field and at low temperature (100 K) under microwave irradiation. The solid state DNP approach enables to obtain new structural and dynamical insights into materials, performing multi-dimensional SS-NMR experiments which were unrealizable because of sensitivity limitation. It opens a new avenue to explore the structural properties of materials.<br/>In this communication, we will present a selection of recent examples of DNP applications for the characterization of different types of materials (synthetic polymers, battery material and bio-materials).

Solid state dynamic nuclear polarization for materials study

255th National Meeting (2018)

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