title: Rotor-synchronized dipolar-filter sequence at fast MAS in solid-state NMR.
abstract: Dipolar filters are of considerable importance for eliminating the (1)H NMR signal of the rigid components of heterogeneous compounds while selecting the signal of their mobile parts. On the basis of such filters, structural and dynamical information of these compounds can often be acquired through further manipulations (e.g. spin diffusion) on the spin systems. To overcome the destructive interferences between the magic angle spinning (MAS) speed and the cycle-time of the widely-used Rotor-Asynchronized Dipolar Filter (RADF) sequence, we introduce a new method called Rotor-Synchronized Dipolar Filter (RSDF). This communication shows that this sequence does not present any interference with the spinning speed and is more compatible than RADF with high MAS frequencies (ν(R)>12 kHz). This new pulse sequence will potentially contribute to future researches on heterogeneous materials, such as multiphase polymer and membrane systems.
authors: Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China.
authors: Qing-Hua
authors: QH
authors: Liu
authors: Chao
authors: C
authors: Ma
authors: Bing-Wen
authors: BW
authors: Hu
authors: Qun
authors: Q
authors: Chen
authors: Julien
authors: J
authors: Trebosc
authors: Olivier
authors: O
authors: Lafon
authors: Jean-Paul
authors: JP
authors: Amoureux
mesh_terms: D000465:Algorithms; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D008567:Membranes, Artificial; D011108:Polymers / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D011108:Polymers